英、美制螺纹标准直径、螺距参照表
普通的公制、英制、美制螺纹计算公式，附最新英制螺纹对照表
普通的公制、英制、美制螺纹计算公式，附最新英制螺纹对照表公制螺纹(MM牙)牙深=0.6495*牙距P(牙角60度)内牙孔径= 公称直径-1.0825*PM20x2.5-6H/7g (右手)-(单头螺纹)-(公制粗牙)(公称直径20mm) (牙距2.5mm)(内螺纹配合等级6H)(外螺纹配合等级7g)左-双头-M20x1.5 (左手)-(双头螺纹)-(公制细牙)(公称直径20mm) (牙距1.5mm)美制螺纹(统一标准螺纹)牙深= 0.6495*(25.4/每吋牙数)(牙角60度)3/4-10UNC-2A(UNC粗牙)(UNF细牙)(1A 2A 3A 外牙公差配合等级)(1B 2B 3B 内牙公差配合等级)UNC美制统一标准粗牙螺纹外径3/4英吋,每英吋10牙外牙 2级公差配合管螺纹(英制PT)牙深= 0.6403*(25.4/每吋牙数)(牙角55度)PT 3/4-14 (锥度管螺纹) 锥度管螺纹,锥度比1/16 3/4英吋管用,每英吋14牙螺纹(PS直螺纹)(PF细牙)牙深= 0.6403*(25.4/每吋牙数)(牙角55度)PS 3/4-14 (直形管螺纹)PF1 1/8-16 (直形管螺纹)(细牙)直形管螺纹3/4英吋管用,每英吋14牙1 1/8英吋管用,每英吋16牙管螺纹(美制NPT)(牙角60度)NPT 3/4-14 (锥形管螺纹) 锥形管螺纹,锥度比1/16 3/4英吋管用,每英吋14牙梯形螺纹(30度公制)TM40*6 公称直径40mm 牙距6.0mm梯形螺纹(29度爱克姆螺纹)TW26*5 外径26mm,每英吋5牙方形螺纹车牙的计算考虑条件计算公式公制牙与英制牙的转换每吋螺纹数 n = 25.4 / 牙距 P牙距 P = 25.4 / 每吋螺纹数 n因为工件材料及刀具所决定的转速转速 N = (1000周速 V ) / (圆周率 p * 直径 D )因为机器结构所决定的转速刀座快速移动的影响车牙最高转速 N = 4000/ P刀座快速移动加减速的影响下刀点与退刀点的计算(不完全牙的计算) 下刀最小距离 L1L1 = (牙距 P ) * (主轴转速 S ) / 500退刀最距离 L2L2 = (牙距 P ) * (主轴转速 S ) / 2000牙深及牙底径d 牙深 h =0.6495 * P牙底径 d =公称外径 D - 2 * h例题：车制外牙3/4'-10UNC 20mm长公制牙与英制牙的转换牙距 P = 25.4 / (吋螺纹数 n)P = 25.4 / 10 = 2.54mm因为工件材料及刀具所决定的转速外径 D = 3 / 4英吋 = 25.4 * (3/4) =19.05MM转速 N = (1000周速V) / (圆周率 p * 直径 D )N = 1000V / pD = 1000 * 120 / (3.1416*19.05)=2005 rpm (转/分)因为机器结构所决定的转速刀座快速移动的影响车牙最高转速 N =4000 / PN = 4000/2.54 = 1575 rpm综合工件材料刀具及机械结构所决定的转速 N = 1575 转N = 2005转两者转速选择较低者,即1575转刀座快速移动加减速的影响下刀点与退刀点的计算(不完全牙的计算) 下刀最小距离 L1L1 = (牙距P) * (主轴转速S) / 500L1 = 2.54*1575/500=8.00mm退刀最小距离 L2L2 = (牙距P) * (主轴转速S) / 2000L2 = 2.54*1575/2000=2.00mm牙深及牙底径d 牙深径d = 公称外径D-2*h =19.05-2*1.65 = 15.75mm附表：英制普通螺纹(惠氏螺纹) -- 小螺纹系列(BA)名义尺寸牙型代号大径螺距每英寸牙数中径小径牙型高底孔直径BA mm mm tpi mm 外螺纹H1 mmd=D p d2=D2 d3No. 14 BA 1 0.23 110.4 0.86 0.72 0.14 0.75 No. 13 BA 1.2 0.25 101.6 1.05 0.9 0.15 0.95 No. 12 BA 1.3 0.28 90.71 1.13 0.96 0.17 1 No. 11 BA 1.5 0.31 81.93 1.315 1.13 0.185 1.2 No. 10 BA 1.7 0.35 72.57 1.49 1.28 0.21 1.35 No. 9 BA 1.9 0.39 65.12 1.665 1.43 0.235 1.5 No. 8 BA 2.2 0.43 59.07 1.94 1.68 0.26 1.8 No. 7 BA 2.5 0.48 52.92 2.21 1.92 0.29 2 No. 6 BA 2.8 0.53 47.92 2.48 2.16 0.32 2.3 No. 5 BA 3.2 0.59 43.05 2.845 2.49 0.355 2.6 No. 4 BA 3.6 0.66 38.48 3.205 2.81 0.395 2.95 No. 3 BA 4.1 0.73 34.79 3.66 3.22 0.44 3.4 No. 2 BA 4.7 0.81 31.35 4.215 3.73 0.485 3.9 No. 1 BA 5.3 0.9 28.22 4.76 4.22 0.54 4.4No. 0 BA 6 1 25.4 5.4 4.8 0.6 5 55°圆锥管螺纹型式和尺寸（2006-03-13 14:38:47 ）螺纹代号基本尺寸大径螺距每英寸牙数中径小径牙型高度圆弧尺寸底英寸mm mm tpi mm 外螺纹H1 r mm d=D p d2=D2 d3R 1/16 1/16＂7.723 0.907 28 7.142 6.561 0.581 0.125 6. R 1/8 1/8＂9.728 0.907 28 9.147 8.566 0.581 0.125 8. R 1/4 1/4＂13.157 1.337 19 12.301 11.445 0.856 0.184 11 R 3/8 3/8＂16.662 1.337 19 15.806 14.95 0.856 0.184 14 R 1/2 1/2＂20.955 1.814 14 19.793 18.631 1.162 0.249 18 R 3/4 3/4＂26.441 1.814 14 25.279 24.117 1.162 0.249 23 R 1 1＂33.249 2.309 11 31.77 30.291 1.479 0.317 30 R 1 1/4 1 1/4＂ 41.91 2.309 11 40.431 38.952 1.479 0.317 38 R 1 1/2 1 1/2＂ 47.803 2.309 11 46.324 44.845 1.479 0.317 44 R 2 2＂59.614 2.309 11 58.135 56.656 1.479 0.317 56 R 2 1/2 2 1/2＂ 75.184 2.309 11 73.705 72.226 1.479 0.317 71 R 3 3＂87.884 2.309 11 86.405 84.926 1.479 0.317 85 R 4 4＂113.03 2.309 11 111.551 110.072 1.479 0.317 11 R 5 5＂138.43 2.309 11 136.951 135.472 1.479 0.317 13 R 6 6＂163.83 2.309 11 162.351 160.872 1.479 0.317 16制惠氏螺纹的型式尺寸英制普通螺纹(惠氏螺纹) -- 粗牙(BSW)名义尺寸牙型代号大径螺距每英寸牙数中径小径牙型高底孔直径Ww mm mm tpi mm 外螺纹H1 mmd=D p d2=D2 d31/16＂BSW 1.587 0.423 60 1.315 1.05 0.27 1.15 3/32＂BSW 2.381 0.529 48 2.041 1.703 0.338 1.9 1/8＂BSW 3.175 0.635 40 2.768 2.362 0.406 2.5 5/32＂BSW 3.969 0.793 32 3.459 2.952 0.507 3.2 3/16＂BSW 4.762 1.058 24 4.084 3.407 0.677 3.7 7/32＂BSW 5.556 1.058 24 4.878 4.201 0.677 4.5 1/4＂BSW 6.35 1.27 20 5.537 4.724 0.813 5.1 5/16＂BSW 7.938 1.411 18 7.034 6.131 0.904 6.53/8＂BSW 9.525 1.588 16 8.509 7.492 1.017 7.9 7/16＂BSW 11.113 1.814 14 9.951 8.789 1.162 9.2 1/2＂BSW 12.7 2.117 12 11.345 9.99 1.355 10.4 5/8＂BSW 15.876 2.309 11 14.397 12.918 1.479 13.4 3/4＂BSW 19.051 2.54 10 17.424 15.798 1.627 16.25 7/8＂BSW 22.226 2.822 9 20.419 18.611 1.807 19.25 1＂BSW 25.4 3.175 8 23.368 21.335 2.033 221 1/8＂BSW 28.576 3.629 7 26.253 23.929 2.324 24.5 1 1/4＂BSW 31.751 3.629 7 29.428 27.104 2.324 27.25 1 3/8＂BSW 34.926 4.233 6 32.215 29.505 2.711 30.25 1 1/2＂BSW 38.1 4.233 6 35.391 32.68 2.711 33.5 1 5/8＂BSW 41.277 5.08 5 38.024 34.771 3.253 35.5 1 3/4＂BSW 44.452 5.08 5 41.199 37.946 3.253 38.5 1 7/8＂BSW 47.627 5.6454 1/2 44.012 40.398 3.614 41.25 2＂BSW 50.802 5.645 4 1/2 47.187 43.573 3.614 44.5 2 1/4＂BSW 57.152 6.35 4 53.086 49.02 4.066 502 1/2＂BSW 63.502 6.35 4 59.436 55.37 4.066 562 3/4＂BSW 69.853 7.257 3 1/2 65.205 60.558 4.647 61.5 3＂BSW 76.203 7.257 3 1/2 71.556 66.909 4.647 683 1/4＂BSW 82.553 7.816 3 1/4 77.548 72.544 5.005 73.75 3 1/2＂BSW 88.903 7.816 3 1/4 83.899 78.894 5.005 803 3/4＂BSW 95.254 8.467 3 89.832 84.41 5.422 85.5 4＂BSW 101.604 8.467 3 96.182 90.76 5.422 924 1/4＂BSW 107.954 8.835 2 7/8 102.297 96.639 5.657 984 1/2＂BSW 114.304 8.835 2 7/8 108.647 102.99 5.657 104.2 4 3/4＂BSW 120.665 9.237 2 3/4 114.74 108.625 5.915 110 5＂BSW 127.005 9.237 2 3/4 121.09 115.176 5.915 116.5 5 1/4＂BSW 133.355 9.677 2 5/8 127.159 120.963 6.196 122.5 5 1/2＂BSW 139.705 9.677 2 5/8 133.509 127.313 6.196 128.5 5 3/4＂BSW 146.055 10.16 2 1/2 139.549 133.043 6.506 134.5 6＂BSW 152.406 10.16 2 1/2 145.9 139.394 6.506 141 英制普通螺纹-- 细牙-- BSF英制普通螺纹(惠氏螺纹) -- 细牙(BSW)名义尺寸牙型代号大径螺距每英寸牙数中径小径牙型高底孔直径BSF mm mm tpi mm 外螺纹H1 mm d=D p d2=D2 d33/16 BSF 4.763 0.794 32 4.255 3.747 0.508 47/32 BSF 5.556 0.907 28 4.975 4.394 0.581 4.6 1/4 BSF 6.35 0.977 26 5.725 5.1 0.625 5.3 9/32 BSF 7.142 0.977 26 6.518 5.893 0.625 6.1 5/16 BSF 7.938 1.156 22 7.199 6.459 0.739 6.8 3/8 BSF 9.525 1.27 20 8.712 7.899 0.813 8.3 7/16 BSF 11.113 1.411 18 10.209 9.304 0.904 9.7 1/2 BSF 12.7 1.588 16 11.684 10.668 1.017 11.1 9/16 BSF 14.288 1.588 16 13.272 12.256 1.017 12.7 5/8 BSF 15.875 1.814 14 14.712 13.549 1.162 1411/16 BSF 17.463 1.814 14 16.3 15.137 1.162 15.5 3/4 BSF 19.05 2.117 12 17.693 16.336 1.355 16.75 13/16 BSF 20.638 2.117 12 19.281 17.924 1.355 18.25 7/8 BSF 22.225 2.309 11 20.747 19.269 1.479 19.75 1.00 BSF 25.4 2.54 10 23.774 22.148 1.627 22.75 1 1/8 BSF 28.575 2.822 9 26.769 24.963 1.807 26.5 1 1/4 BSF 31.75 2.822 9 29.944 28.138 1.807 28.75 1 3/8 BSF 34.925 3.175 8 32.893 30.861 2.033 31.5 1 1/2 BSF 38.1 3.175 8 36.068 34.036 2.033 34.5 1 5/8 BSF 41.275 3.175 8 39.243 37.211 2.033 381 3/4 BSF 44.45 3.629 7 42.126 39.802 2.324 40.52 BSF 50.8 3.629 7 48.476 46.152 2.324 472 1/4 BSF 57.15 4.234 6 54.44 51.73 2.711 532 1/2 BSF 63.5 4.234 6 60.79 58.08 2.711 592 3/4 BSF 69.85 4.234 6 67.14 64.43 2.711 -3 BSF 76.2 5.08 5 72.946 69.692 3.253 -3 1/4 BSF 82.55 5.08 5 79.296 76.042 3.253 -3 1/2 BSF 88.9 5.6454 1/2 85.285 81.67 3.614 -3 3/4 BSF 95.25 5.645 4 1/2 91.635 88.02 3.614 -4 BSF 101.6 5.645 4 1/2 97.985 94.37 3.614 -4 1/4 BSF 107.95 6.35 4 103.886 99.822 4.066 - 55°圆柱管螺纹的型式和尺寸British Pipe Thread (惠氏管螺纹) -- 圆柱(BSPP/BSPF)螺纹代号基本尺寸大径螺距每英寸牙数中径小径牙型高度底孔尺寸mm mm tpi mm 外螺纹H1 mmd=D p d2=D2 d3G 1/8 1/8＂9.728 0.907 28 9.147 8.566 0.581 8.7 G 1/4 1/4＂13.157 1.337 19 12.301 11.445 0.856 11.6 G 3/8 3/8＂16.662 1.337 19 15.806 14.95 0.856 15G 1/2 1/2＂20.955 1.814 14 19.793 18.631 1.162 19G 5/8 5/8＂22.911 1.814 14 21.749 20.587 1.162 20.75 G 3/4 3/4＂26.441 1.814 14 25.279 24.117 1.162 24.5 G 7/8 7/8＂30.201 1.814 14 29.039 27.877 1.162 28G 1 1＂33.249 2.309 11 31.77 30.291 1.479 30.5 G 1 1/8 1 1/8＂ 37.897 2.309 11 36.418 34.939 1.479 35G 1 1/4 1 1/4＂ 41.91 2.309 11 40.431 38.952 1.479 39.5 G 1 3/8 1 3/8＂ 44.323 2.309 11 42.844 41.365 1.479 41.5 G 1 1/2 1 1/2＂ 47.803 2.309 11 46.324 44.845 1.479 45G 1 3/4 1 3/4＂ 53.746 2.309 11 52.267 50.788 1.479 51G 2 2＂59.614 2.309 11 58.135 56.656 1.479 57G 2 1/4 2 1/4＂ 65.71 2.309 11 64.231 62.752 1.479 63G 2 1/2 2 1/2＂ 75.184 2.309 11 73.705 72.226 1.479 72.5 G 2 3/4 2 3/4＂ 81.534 2.309 11 80.055 78.576 1.479 79G 3 3＂87.884 2.309 11 86.405 84.926 1.479 85.5 G 3 1/4 3 1/4＂ 93.98 2.309 11 92.501 91.022 1.479 91G 3 1/2 3 1/2＂ 100.33 2.309 11 98.351 97.372 1.479 97.75 G 3 3/4 3 3/4＂ 106.68 2.309 11 105.201 103.722 1.479 104 G 4 4＂113.03 2.309 11 111.55 110.072 1.479 110.5 G 4 1/2 4 1/2＂ 125.73 2.309 11 124.251 122.772 1.479 123 G 5 5＂138.43 2.309 11 136.951 135.472 1.479 136 G 5 1/2 5 1/2＂ 151.13 2.309 11 149.651 148.172 1.479 148.5 G 6 6＂163.83 2.309 11 162.351 160.872 1.479 161.5RC2英寸锥管螺纹，每英寸11牙，螺距=25.4/11即2.309，牙高（深）=2.309×0.64即1.479，锥度是固定的即1：16R等于1/32乘以长度1/32意思是，锥螺纹的锥度是1：16 ，单边就是1：32长度意思是：定位点加有效长度比如我定位3.0，有效长度是12.0R=1/32 X（3+12）=0.468751、密封管螺纹（R）英制密封管螺纹的基本尺寸及其公差配合方式英制密封管螺纹有两种配合方式：圆柱内螺纹与圆锥外螺纹组成“柱/锥”配合；圆锥内螺纹与圆锥外螺纹组成“锥/锥”配合.欧洲国家主要采用“柱/锥”配合螺纹；而欧洲以外国家则主要采用“柱/锥”配合螺纹.两种螺纹的检验量规存在一定不同；目前的ISO 英制密封管螺纹量规标准（ISO 7-2：2000）是按“柱/锥”配合体系设计的.编辑本段密封管螺纹的标记英制密封管螺纹的完整标记由螺纹特征代号、螺纹尺寸代号和旋向代号组成.英制密封圆柱内螺纹的特征代号为：RP；英制密封圆锥内螺纹的特征代号为：RC；英制密封圆锥外螺纹的特征代号为：R1（与英制密封圆柱内螺纹配合使用）；R2（与英制密封圆锥内螺纹配合使用）；左旋螺纹的旋向代号为LH；右旋螺纹的旋向代号省略不标.对密封管螺纹，利用RP/R1，RC/R2分别表示“柱/锥” 和“锥/锥”螺纹副.2、非密封管螺纹英制非密封管的基本尺寸及其极限偏差标记:英制非密封管螺纹的完整标记由螺纹特征代号，螺纹尺寸代号，中径公差等级代号和旋向代号组成.英制非密封圆柱螺纹的特征代号为：G对英制非密封圆柱内螺纹，其中径公差等级代号省略不标；而英制非密封圆柱外螺纹的中径公尺等级代号分别为A和B.左旋螺纹的旋向代号为LH；右旋螺纹的旋向代号省略不标.当表示英制非密封管螺纹的螺纹副时，仅标注外螺纹的标记代号.示例：尺寸代号为2的右旋，非密封圆柱内螺纹：G2尺寸代号为3的A级，右旋，非密封圆柱外螺纹：G3A尺寸代号为4的B级，左旋，非密封圆柱外螺纹：G4 B-LH尺寸代号为2的右旋，非密封圆柱内螺纹与A级圆柱外螺纹组成的螺纹副：G2A加工内孔螺纹的是管螺纹丝锥加工外螺纹的有板牙。
公制,英制,美制螺纹尺寸对照表
螺纹简介：1.1螺纹的起源一般认为，阿基米德（公元前287-212年）是首先将螺纹用于工业目的，即将低处的水移到高处的一种工具。
1659年法国人贝兹逊发明螺纹切割机；其后，经过英国的威阿特、亨利•莫斯列，到其子弟约瑟夫•惠氏于1841年才统一原本混乱的螺纹，促进螺纹制品的全球普及；因此，惠氏螺纹也随英国工业的发达而广泛传播世界。
美制螺纹依据塞勒氏螺纹（Seller's thread）而问世于1924年；二次世界大战中，美国、英国、加拿大三国协定发展成统一制螺纹Unified thread。
随着国际交流的频繁，1947年成立的ISO国际标准化组织（International standard organization)成为推动国际标准化的重要力量。
1.2螺纹概述按用途分类，可分为紧固螺纹、密封螺纹、传动螺纹、管螺纹、专用螺纹。
1.3螺纹的分类A、公制螺纹表示螺纹的记号为M,公称直径d或D与螺距P是以mm毫米来标识，螺纹牙尖角为60度。
这是我国GB标准所规定使用的螺纹，也是常见到的。
B、英美制统一螺纹表示螺纹的记号为U,公称直径d或D为英寸，螺距是以每英寸（25.4mm）的牙树来标识，螺纹牙尖角为60度。
这是通俗成为美制规格的螺纹。
C、惠氏螺纹表示螺纹的记号为W，螺纹直径为英寸，螺距以每英寸（25.4mm）的牙树来标识，螺纹牙尖角为55度。
这是英国采用的标准，牙尖角有点特殊的螺纹。
D、管用螺纹主要指英国BSP螺纹系统，用在管接头，分为推拔螺纹（记号为PT）和平和螺纹（记号为PS），牙尖角为55度，螺距以每英寸（25.4mm）的牙树来标识；公称方法依据所配的钢管的公称方法（英寸），因此，实际的螺纹外径与公称直径不同。
E、自行车用螺纹表示螺纹的记号为BC,螺纹的牙尖角为60度，一般用的公称直径为英寸，轮辐用的公称直径为mm，螺距是以每25.4mm的牙树来标识。
F、缝纫机用螺纹表示螺纹的记号为SM，为缝纫机专用螺纹，牙尖角为60度，公称直径为英寸，螺距是以每25.4mm的牙树来标识。
各国标准螺纹基本尺寸对照表
英制管螺纹基本尺寸及公差（牙形角55º）BSPP英制锥管螺纹基本尺寸及公差（牙形角55º）BSPT美制管螺纹基本尺寸及公差（牙形角60º）UN(F)公制螺纹基本尺寸及公差(牙形角60º) M55°圆锥管螺纹基本尺寸对照表最新下载-汇兴达55°圆锥管螺纹基本尺寸对照表最新下载-汇兴达55°圆锥管螺纹(BSPT)R4 4"113.032.30911111.551110.0721.479R5 5"138.432.30911136.951135.4721.479R66"163.832.30911162.351160.8721.479聊城市鑫茂祥管业有限公司专业经营钢管规格：5mm*1mm—1020mm*200mm合金钢管、外径22mm-127mm冷轧无缝钢管、外径127mm-600mm，壁厚16mm-100mm，外径精度±0.5%,壁厚精度±5%热轧中厚壁无缝钢管、16Mn外径400—1600mm、壁厚20—60mm 的大口径厚壁卷管，可定尺到16米及各种规格的无缝方管、异型无缝钢管等.常备钢管种类有:构造用无缝钢管、流体用无缝钢管、液压无缝钢管、电力用无缝钢管、石油输送用无缝钢管、化肥设备用无缝钢管、煤矿用无缝钢管、不锈钢无缝钢管、化工用无缝钢管、纺织机械用无缝钢管、汽车；水利用无缝钢管，精密无缝钢管、光亮无缝钢管、军工医疗用无缝钢管、管道用无缝钢管、支柱用无缝钢管、合金无缝管、高压无缝管、大口径直缝焊管等。
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管螺纹的基本尺寸表(2010-10-25 15:57:35)转载▼标签：杂谈表（1）螺纹基本尺寸G1/2 、ZG1/2 (单位:mm)尺寸代号每25.4mm类的牙数n螺距p 牙型高度h圆弧半径r≈基面上的基本直径基准距离有效螺纹长度大径（基准直径）d=D中径d2=D2小径d1=D1锥管螺纹的基本尺寸表（3-28）1/2PT 、1/2NPT 表（2）螺纹基本尺寸 (单位:mm)螺纹标准的一种，按外形分圆柱、圆锥两种；按牙型角分55°、60°两种。
美制英制公制螺纹孔尺寸表
螺纹规格-美制、英制、公制公制/美制/英制螺纹对照表给大家分享一下 A型美制螺纹（UNF）常用规格牙型角60外螺纹内螺纹 -4 9/16"-19牙 14.28 13.08 -6 11/16''-16 17.46 16.1 -8 13/16''-16 20.64 19.28 -10 1''-14 2 5.40 23.57 -12 1(3/16)''-12 30.00 28.32 -16 1(7/16)''-12 36.51 34.67 -20 1(11/16)' '-12 42.86 41.02 C型JIC37度美制UNF螺纹常用规格牙型角60-4 7/16”-20 11.11 10.03 -5 1/2”-20 12.70 11.32-6 9/16”-18 14.28 13.08 -83/4”-16 19.00 17.68 -10 7/8”-14 22.22 20.68 -12 1(1/16)"-12 26.98 25.15 -16 1 (5/16)"-12 33.33 31.5 -20 1(5/8)"-12 41.28 39.44 -24 1(7/8)"-12 47.62 45.8 -32 2(1/2)"-12 63.5 61.67 英制圆柱管螺纹（BSPP）常用规格牙型角55-4 1/4”-19 13.157 11.55 -6 3/8”-19 16.662 14.95 -8 1/2”-14 20.955 18.63 -12 3/4”-14 26.441 24.11 -16 1”-11 33.249 30.29 -20 1(1/4)''-11 41.91 38.95 英制圆锥管螺纹（BSPT）常用规格牙型角55基面大径基准距离1/4”-19 13.157 6 3/8”-19 16.662 6.4 1/2”-14 20.955 8.2 3/4”-14 26.441 9.5 1”-11 33.249 10.4 1(1/4)''-11 41.91 12.7 美制圆锥管螺纹（NPT）牙型角601/8”-27 10.24 4 1/4”-18 13.60 4 3/8”-18 17.04 4.32 1/2”-14 21.22 4.48 3/4”-14 26.57 4.75 1”-11(1/2)” 33.22 4.6 1(1/4)”-11.5 41.96 4.83螺纹的一般知识第一章国标螺纹的一般知识一. 螺纹的分类1. 螺纹分内螺纹和外螺纹两种；2. 按牙形分可分为：1）三角形螺纹2）梯形螺纹3）矩形螺纹4）锯齿形螺纹；3. 按线数分单头螺纹和多头螺纹；4. 按旋入方向分左旋螺纹和右旋螺纹两种, 右旋不标注，左旋加LH，如M24×1.5LH；5. 按用途不同分有：米制普通螺纹、用螺纹密封的管螺纹、非螺纹密封的管螺纹、60°圆锥管螺纹、米制锥螺纹等二. 米制普通螺纹1. 米制普通螺纹用大写M表示，牙型角2α=60°（α表示牙型半角）；2. 米制普通螺纹按螺距分粗牙普通螺纹和细牙普通螺纹两种；2.1. 粗牙普通螺纹标记一般不标明螺距，如M20表示粗牙螺纹；细牙螺纹标记必须标明螺距，如M30×1.5表示细牙螺纹、其中螺距为1.5。
英制、美制螺纹牙距大全
BSF-英制惠氏55度细牙螺纹BSW-英制惠氏55度粗牙螺纹UN-美制60度不变螺距螺纹UNC-美制60度粗牙螺纹（代号：NC）UNF-美制60度细牙螺纹（代号：NF）UNEF-美制60度超细牙螺纹UNS-美制60度特殊螺纹NPT-美制60度一般用途管螺纹（旧代号：Z、K）NPSC-美制60度管接头内螺纹NPSM-美制60度，设备上自由配合，机械连接用直管螺纹G-美制60度直管螺纹R-美制60度锥管螺纹（旧代号：ZG、KG）RC-美制60度锥管内螺纹NPTF-美制60度干密封锥管螺纹NPSF-美制60度干密封直管螺纹NGT-美制60度气瓶用锥螺纹2M-米制55度锥管螺纹SM-缝纫机螺纹PZ-气瓶用螺纹5V1-20V1-气门芯螺纹LH-旋向代号，左旋螺纹。
右旋（正扣）省略不标G2-非密封内螺纹。
G2A-与A级圆柱外螺纹组成螺纹副。
G3A-非密封外螺纹。
G4B-LH-非密封左旋，4的B级。
55度锥螺纹有1：16的锥度。
No.0-80 UNF-2B --NO.-表示代号，0-表示直径，80-表示牙数，UNF-表示，2-表示：螺纹精度等级，有1、2、3级，3级为无间隙配合，用于精度高场合。
2级为一般用途坚固螺纹。
1级为配合后螺纹间隙大。
B-表示：内螺纹（A表示外螺纹，省略不标）NO.1-64UNC NO.1-72UNC NO.2-56UNC NO.2-64UNC NO.3-48UNC NO.3-56UNC NO.4-40UNC NO.4-48UNC NO.5-40UNC NO.5-44UNF NO.6-32UNC NO.6-40UNF NO.8-32UNC NO.8-36UNFNO.10-24UNC No.10-28UNS No.10-32UNF No.10-36UNS N o.10-40UNSNo.10-48UNS No.10-56UNS No.10-64UNS No.10-72UNS No. 10-80UNSNo.12-24UNC No.12-28UNF No.12-32UNEF No.12-36UNS N o.12-40UNSNo.12-48UNS No.12-56UNS No.12-64UNS No.12-72UNSNo.12-80UNS1/4-20UNC 1/4-22UNS 1/4-24UNS 1/4-27UNS 1/4-28UNF 1/4-32UNEF 1/4-36UNS 1/4-40UNS 1/4-48UNS1/4-56UNS 1/4-64UNS 1/4-72UNS 1/4-80UNS5/16-18UNC 5/16-20UN 5/16-24UNF 5/16-26UNS 5/16-27U NS 5/16-28UN 5/16-32UNEF 5/16-36UNS5/16-40UNS5/16-48UNS 5/16-56UNS 5/16-64UNS 5/16-72UNS5/16-80UNS3/8-16UNC 3/8-18UNS 3/8-20UN 3/8-22UN 3/8-24UNF3/8-26UN 3/8-27UNS 3/8-28UN 3/8-32UNEF 3/8-36UNS3/8-40UNS 3/8-48UNS 3/8-56UNS 3/8-64UNS 3/8-72UNS3/8-8 0UNS7/16-14UNC 7/16-16UN 7/16-18UNS 7/16-20UNF7/16-24UNS 7/16-27UNS 7/16-28UNEF 7/16-32UN7/16-36UNS 7/16-40UNS 7/16-48UNS 7/16-56UNS7/16-64UNS 7/16-72UNS 7/16-80UNS1/2-12UNS 1/2-13UNC 1/2-14UNS 1/2-16UN 1/2-18UNS1/2-20UNF1/2-24UNS 1/2-27UNS 1/2-28UNEF 1/2-32UN 1/2-36UNS1/2-40UNS 1/2-48UNS 1/2-56UNS 1/2-64UNS 1/2-72UNS1/2-80UNS9/16-12UNC 9/16-14UNS 9/16-16UN 9/16-18UNF9/16-20UN 9/16-24UNEF 9/16-28UN 9/16-32UN9/16-36UNS 9/16-40UNS 9/16-48UNS 9/16-56UNS9/16-72UNS5/8-11UNC 5/8-12UN 5/8-14UNS 5/8-16UN 5/8-18UNF5/8-20UN 5/8-24UNEF 5/8-27UNS 5/8-28UN 5/8-32UN5/8-36UNS 5/8-40UNS 5/8-48UNS5/8-56UNS11/16-12UN 11/16-16UN 11/16-20UN 11/16-24UNEF 11/16-2 8UN 11/16-32UN 11/16-40UN 11/16-48UN11/16-56UN3/4-10UNC 3/4-12UN 3/4-14UNS 3/4-16UNF 3/4-18UNS 3/4-2 0UNEF3/4-24UNS 3/4-27UNS 3/4-28UN 3/4-32UN 3/4-36UNS3/4-40UNS 3/4-48UNS 3/4-56UNS13/16-12UN 13/16-16UN 13/16-20UNEF 13/16-28UN 13/16-3 2UN7/8-9UNC 7/8-10UNS 7/8-12UN 7/8-14UNF 7/8-16UN7/8-18UN 7/8-20UNEF 7/8-24UNS 7/8-27UNS 7/8-28UN 7/8-32UN 7/8-36UN 7/8-40UN15/16-12UN 15/16-16UN 15/16-20UNEF 15/16-28UN 15/16-3 2UN1-8UNC 1-10UN 1-12UNF 1-14UNS 1-16UNS1-18UNS 1-20UNEF 1-24UN 1-27UNS 1-28UNS 1-32UNS 1-36UNS 1-40UNS1 1/16-8UN 1 1/16-12UN 1 1/16-16UN1 1/16-18UNEF 1 1/16-20UN 1 1/16-28UN1 1/8-14UNS 1 1/8-16UN 1 1/8-18UNEF1 1/8-20UN 1 1/8-24UNS 1 1/8-28UN1 3/16-8UN 1 3/16-12UN 1 3/16-16UN1 3/16-18UNEF 1 3/16-20UN 1 3/16-28UN1 1/4-7UNC 1 1/4-8UN 1 1/4-10UNS 1 1/4-12UNF 1 1/4-14UNS 1 1/4-16UN 1 1/4-18UNEF1 1/4-20UN 1 1/4-24UNS 1 1/4-28UN1 5/16-8UN 1 5/16-12UN 1 5/16-16UN1 5/16-18UNEF 1 5/16-20UN1 5/16-28UN1 3/8-6UNC 1 3/8-10UNS 1 3/8-12UNF1 3/8-14UNS 1 3/8-16UN1 3/8-18UNEF 1 3/8-20UN 1 3/8-24UNS 1 3/8-28UN 1 7/16-6UN 1 7/16-8UN 1 7/16-12UN 1 7/16-16UN 1 7/16-18UNEF 1 7/16-20UN 1 7/16-28UN1 1/2-14UNS 1 1/2-16UN 1 1/2-18UNEF 1 1/2-20UN 1 1/2-24UNS 1 1/2-28UN1 9/16-6UN 1 9/16-8UN 1 9/16-10UN1 9/16-12UN 1 9/16-16UNEF1 9/16-18UN 1 9/16-20U 1 9/16-6UN 1 9/16-8UN 1 9/16-10UN 1 9/16-12UN 1 9/16-16UNEF1 9/16-18UN 1 9/16-20UN15/8-6UN 1 5/8-8UN 1 5/8-10UNS 1 5/8-12UN1 5/8-14UNS 1 5/8-16UN1 5/8-18UNEF 1 5/8-20UN 1 5/8-24UNS1 11/16-6UN 1 11/16-8UN 1 11/16-12UN1 11/16-16UN 1 11/16-18UNEF 1 11/16-20UN1 3/4-5UN 1 3/4-6UN 1 3/4-8UN 1 3/4-10UN1 3/4-12UN 1 3/4-14UNS1 3/4-16UN 1 3/4-18UNS 1 3/4-20UN1 13/16-6UN 1 13/16-8UN 1 13/16-12UN1 13/16-16UN 1 13/16-20UN1 7/8-6UN 1 7/8-8UN 1 7/8-10UNS 1 7/8-12UN 1 7/8-14UNS 1 7/8-16UN 1 7/8-18UNS 1 7/8-20UN 1 15/16-6UN 1 15/16-8UN 1 15/16-12UN1 15/16-16UN 1 15/16-20UN2-4.5UNC 2-6UN 2-8UN 2-10UNS 2-12UN2-14UNS 2-16UN 2-18UNS 2-20UN2 1/16-16 2 3/16-6 2 5/16-16 2 7/16-162 1/8-6UN 2 1/8-8UN 2 1/8-12UN 2 1/8-16UN2 1/8-20UN2 1/4-4.5UNC 2 1/4-6UN 2 1/4-8UN 2 1/4-10UN 2 1/4-12UN 2 1/4-14UN2 1/4-16UN 2 1/4-18UN 2 1/4-20UN2 3/8-6UN 2 3/8-8UN 2 3/8-12UN 2 3/8-16UN2 3/8-20UN2 1/2-4UNC 2 1/2-6UN 2 1/2-8UN 2 1/2-10UN2 1/2-12UN 2 1/2-14UN2 1/2-16UN 2 1/2-18UN 2 1/2-20UN2 5/8-6UN 2 5/8-8UN 2 5/8-12UN 2 5/8-16UN2 5/8-20UN2 3/4-4UNC 2 3/4-6UN 2 3/4-8UN 2 3/4-12UN2 3/4-16UN 2 3/4-20UN2 7/8-6UN 2 7/8-8UN 2 7/8-12UN 2 7/8-16UN2 7/8-20UN3-4UNC 3-6UN 3-8UN 3-12UN 3-16UN 3-20UN 牙型角为55度螺纹方向分：正牙（右牙）和反牙（左牙=LH）BSW英国惠氏粗牙螺纹板牙/BSW英制扳牙公称直经-每英寸牙数-螺纹系列代号1/8-40BSW 3/16-24BSW 1/4-20BSW 5/16-18BSW 3/8-16BSW 7/16-14BSW 1/2-12BSW 9/16-12BSW 5/8-11BSW 11/16-11BSW 3/4-10BSW 7/8-9BSW 1-8BSW 1 1/8-7BSW 1 1/4-7BSW 1 1/2-6BSW1 3/4-5BSW 2-4.5BSW2 1/4-4BSW 2 1/2-4BSW2 3/4-3.5BSW 3-3.5BSW3 1/4-3.1/4BSW3 1/2-3.1/4BSW 3 3/4-3BSW 4-3BSW4 1/2-2.7/8BSW 5-3/4BSW 6-2.1/2BSW55度BSF英国惠氏细牙螺纹公称直经-每英寸牙数-螺纹系列代号3/16-32BSF 7/32-28BSF 1/4-26BSF 9/32-26BSF5/16-22BSF 3/8-20BSF 7/16-18BSF 1/2-16BSF9/16-16BSF 5/8-14BSF 11/16-14BSF 3/4-12BSF7/8-11BSF 1-10BSF 1 1/8-9BSF 1 1/4-9BSF1 3/8-8BSF 1 1/2-8BSF 1 5/8-8BSF1 3/4-7BSF 2-7BSF2 1/4-6BSF 2 1/2-6BSF2 3/4-6BSF 3-5BSF3 1/4-5BSF 3 1/2-4.5BSF3 3/4-4.5BSF 4-4.5BSF4 1/4-4BSF。
公制美制英制螺纹对照表
公制/美制/英制螺纹对照表A型美制螺纹（UNF）常用规格外螺纹螺纹-4 9/16"-19牙 14.28 13.08 -6 11/16''-16 17.46 16.1-8 13/16''-16 20.64 19.28-10 1''-14 25.40 23.57-12 1(3/16)''-12 30.00 28.32 -16 1(7/16)''-12 36.51 34.67 -20 1(11/16)''-12 42.86 41.02C型JIC37度美制UNF螺纹常用规格-4 7/16”-20 11.11 10.03-5 1/2”-20 12.70 11.32-6 9/16”-18 14.28 13.08-8 3/4”-16 19.00 17.68-10 7/8”-14 22.22 20.68-12 1(1/16)"-12 26.98 25.15 -16 1(5/16)"-12 33.33 31.5 -20 1(5/8)"-12 41.28 39.44 -24 1(7/8)"-12 47.62 45.8-32 2(1/2)"-12 63.5 61.67英制圆柱管螺纹（BSPP）常用规格-4 1/4”-19 13.157 11.55-6 3/8”-19 16.662 14.95-8 1/2”-14 20.955 18.63-12 3/4”-14 26.441 24.11-16 1”-11 33.249 30.29-20 1(1/4)''-11 41.91 38.95英制圆锥管螺纹（BSPT）常用规格基面大径基准距离1/4”-19 13.157 63/8”-19 16.662 6.41/2”-14 20.955 8.23/4”-14 26.441 9.51”-11 33.249 10.41(1/4)''-11 41.91 12.7美制圆锥管螺纹（NPT）1/8”-27 10.24 41/4”-18 13.60 43/8”-18 17.04 4.321/2”-14 21.22 4.483/4”-14 26.57 4.751”-11(1/2)” 33.22 4.61(1/4)”-11.5 41.96 4.832007-4-20 16:33评论(7)3/8-16 0.3643 0.3737 0.3287 0.3331 0.2970 8.40 8.44(0.375-16) 9.2532 9.4920 8.3490 8.4607 7.54387/16-14 0.4258 0.4361 0.3850 0.3897 0.3485 9.83 9.87(0.4375-14) 10.8153 11.0769 9.7790 9.8984 8.85191/2-13 0.4876 0.4985 0.4435 0.4485 0.4041 11.34 11.38(0.50-13) 12.3850 12.6619 11.2649 11.3919 10.26419/16-12 0.5495 0.5609 0.5016 0.5068 0.4587 12.80 12.84(0.5625-12) 13.9573 14.2469 12.7406 12.8727 11.65105/8-11 0.6113 0.6234 0.5589 0.5644 0.5119 14.27 14.32 (0.625-11) 15.5270 15.8344 14.1961 14.3358 13.00233/4-10 0.7353 0.7482 0.6773 0.6832 0.6255 17.28 17.33 (0.750-10) 18.6766 19.0043 17.2034 17.3533 15.88777/8-9 0.8592 0.8731 0.7946 0.8009 0.7368 20.27 20.32(0.875-9) 21.8237 22.1767 20.1828 20.3429 18.71471"-8 0.9830 0.9980 0.9100 0.9168 0.8446 23.22 23.27(1.000-8) 24.9682 25.3492 23.1140 23.2867 21.45281.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。
英美制标准螺纹尺寸表
最大最小最小1最大最小公差范圍最小最大2A 0.00050.05950.0563…0.05140.04960.00180.04462B 0.04650.05143A 0.00000.06000.0568…0.05190.05060.00130.04513B 0.04650.05142A 0.00060.07240.0686…0.06230.06030.00200.05382B 0.05610.06233A 0.00000.07300.0692…0.06290.06140.00150.05443B 0.05610.06232A 0.00060.07240.0689…0.06340.06150.00190.05592B 0.05800.06353A 0.00000.07300.0695…0.06400.06260.00140.05653B 0.05800.06352A 0.00060.08540.0813…0.07380.07170.00210.06422B 0.06670.07373A 0.00000.08600.0819…0.07440.07280.00160.06483B 0.06670.07372A 0.00060.08540.0816…0.07530.07330.00200.06682B 0.06910.07533A 0.00000.08600.0822…0.07590.07440.00150.06743B 0.06910.07532A 0.00070.09830.0938…0.08480.08250.00230.07342B 0.07640.08453A 0.00000.09900.0945…0.08550.08380.00170.07413B 0.07640.08452A 0.00070.09830.0942…0.08670.08450.00220.07712B 0.07970.08653A 0.00000.09900.0949…0.08740.08580.00160.07783B 0.07970.08652A 0.00080.11120.1061…0.09500.09250.00250.08142B 0.08490.09393A 0.00000.11200.1069…0.09580.09390.00190.08223B 0.08490.09392A 0.00070.11130.1068…0.09780.09540.00240.08642B 0.08940.09683A 0.00000.11200.1075…0.09850.09670.00180.08713B 0.08940.09682A 0.00080.12420.1191…0.10800.10540.00260.09442B 0.09790.10623A 0.00000.12500.1199…0.10880.10690.00190.09523B 0.09790.10622A 0.00070.12430.1195…0.10950.10700.00250.09722B 0.10040.10793A 0.00000.12500.1202…0.11020.10830.00190.09793B 0.10040.10792A 0.00080.13720.1312…0.11690.11410.00280.10002B 0.10400.1143A 0.00000.13800.1320…0.11770.11560.00210.10083B 0.10400.11402A 0.00080.13720.1321…0.12100.11840.00260.10742B 0.1110.1193A 0.00000.13800.1329…0.12180.11980.00200.10823B 0.11100.11862A 0.00090.16310.1571…0.14280.13990.00290.12592B 0.1300.1393A 0.00000.16400.1580…0.14370.14150.00220.12683B 0.13000.13892A 0.00080.16320.1577…0.14520.14240.00280.13012B 0.1340.1423A0.00000.16400.1585…0.14600.14390.00210.13093B0.13400.1416等級允許偏差角最大等級2-56/0.086-562-64/0.086-643-48/0.099-483-56/0.099-560-80/0.060-801-64/0.073-641-72/0.073-726-32/0.138-326-40/0.138-408-32/0.164-328-36/0.164-364-40/0.112-404-48/0.112-485-40/0.125-405-44/0.125-44UNF UNC UNF UNC UNF UNC UNF UNC UNF UNC UNF UNC UNF UNC UNF最大最小最小1最大最小公差范圍最小最大等級允許偏差角最大等級2A 0.00100.18900.1818…0.16190.15860.00330.13942B 0.1450.1563A 0.00000.19000.1828…0.16290.16040.00250.14043B 0.14500.15552A 0.00090.18910.1831…0.16880.16580.00300.15192B 0.1560.1643A 0.00000.19000.1840…0.16970.16740.00230.15283B 0.15600.16412A 0.00100.21500.2078…0.18790.18450.00340.16542B 0.1710.1813A 0.00000.21600.2088…0.18890.18630.00260.16643B 0.17100.18072A 0.00100.21500.2085…0.19180.18860.00320.17242B 0.1770.1863A 0.00000.21600.2095…0.19280.19040.00240.17343B 0.17700.18572A 0.00090.21510.2091…0.19480.19170.00310.17792B 0.1820.1903A 0.00000.21600.2100…0.19570.19330.00240.17883B 0.18200.18951A 0.00110.24890.2367…0.21640.21080.00560.18941B 0.1960.2072A 0.00110.24890.24080.23670.21640.21270.00370.18942B 0.1960.2073A 0.00000.25000.2419…0.21750.21470.00280.19053B 0.19600.20671A 0.00100.24900.2392…0.22580.22080.00500.20641B 0.2110.2202A 0.00100.24900.2425…0.22580.22250.00330.20642B 0.2110.2203A 0.00000.25000.2435…0.22680.22430.00250.20743B 0.21100.21902A 0.00100.24900.2430…0.22870.22550.00320.21182B 0.2160.2243A 0.00000.25000.2440…0.22970.22730.00240.21283B 0.21600.22291A 0.00120.31130.2982…0.27520.26910.00610.24521B 0.2520.2652A 0.00120.31130.30260.29820.27520.27120.00400.24522B 0.2520.2653A 0.00000.31250.3038…0.27640.27340.00300.24643B 0.25200.26302A 0.00120.31130.3032…0.27880.27480.00400.25182B 0.2580.2703A 0.00000.31250.3044…0.28000.27700.00300.25303B 0.25800.26801A 0.00110.31140.3006…0.28430.27880.00550.26181B 0.2670.2772A 0.00110.31140.3042…0.28430.28060.00370.26182B 0.2670.2773A 0.00000.31250.3053…0.28540.28270.00270.26293B 0.26700.27542A 0.00100.31150.3050…0.28830.28490.00340.26892B 0.2740.2823A 0.00000.31250.3060…0.28930.28670.00260.26993B 0.27400.28072A 0.00100.31160.3055…0.29120.28800.00320.27432B 0.2790.2863A0.00000.31250.3065…0.29220.28980.00240.27533B0.27900.284712-32/0.216-321/4-20/0.250-201/4-28/0.250-281/4-32/0.250-3210-24/0.190-2410-32/0.190-3212-24/0.216-2412-28/0.216-285/16-32/0.3125-325/16-18/0.3125-185/16-20/0.3125-205/16-24/0.3125-245/16-28/0.3125-28UNC UNF UNC UNF UNC UN UNF UN UNEF UNCUNF UNEF UNEF最大最小最小1最大最小公差范圍最小最大等級允許偏差角最大等級1A 0.00130.37370.3595…0.33310.32660.00650.29921B 0.3070.3212A 0.00130.37370.36430.35950.33310.32870.00440.29922B 0.3070.3213A 0.00000.37500.3656…0.33440.33110.00330.30053B 0.30700.31822A 0.00120.37380.3657…0.34130.33720.00410.31432B 0.3210.3323A 0.00000.37500.3669…0.34250.33940.00310.31553B 0.32100.32971A 0.00110.37390.3631…0.34680.34110.00570.32431B 0.3300.3402A 0.00110.37390.3667…0.34680.34300.00380.32432B 0.3300.3403A 0.00000.37500.3678…0.34790.34500.00290.32543B 0.33000.33722A 0.00110.37390.3674…0.35070.34710.00360.33132B 0.3360.3453A 0.00000.37500.3685…0.35180.34910.00270.33243B 0.33600.34262A 0.00100.37400.3680…0.35370.35030.00340.33682B 0.3410.3493A 0.00000.37500.3690…0.35470.35220.00250.33783B 0.34100.34691A 0.00140.43610.4206…0.38970.38260.00710.35111B 0.3600.3762A 0.00140.43610.42580.42060.38970.38500.00470.35112B 0.3600.3763A 0.00000.43750.4272…0.39110.38760.00350.35253B 0.36000.37172A 0.00140.43610.4267…0.39550.39090.00460.36162B 0.3700.3843A 0.00000.43750.4281…0.39690.39350.00340.36303B 0.37000.38001A 0.00130.43620.4240…0.40370.39750.00620.37671B 0.3830.3952A 0.00130.43620.4281…0.40370.39950.00420.37672B 0.3830.3953A 0.00000.43750.4294…0.40500.40190.00310.37803B 0.38300.39162A 0.00110.43640.4299…0.41320.40960.00360.39382B 0.3990.4073A 0.00000.43760.4310…0.41430.41160.00270.39493B 0.39900.40512A 0.00100.43650.4305…0.41620.41280.00340.39932B 0.4040.4113A 0.00000.43750.4315…0.41720.41470.00250.40033B 0.40400.40941A 0.00150.49850.4822…0.44850.44110.00740.40691B 0.4170.4342A 0.00150.49850.48760.48220.44850.44350.00500.40692B 0.4170.4343A 0.00000.50000.4891…0.45000.44630.00370.40843B 0.41700.42842A 0.00140.49860.4892…0.45800.45330.00470.42412B 0.4320.4463A 0.00000.50000.4906…0.45940.45590.00350.42553B 0.43200.44191A 0.00130.49870.4865…0.46620.45980.00640.43921B 0.4460.4572A 0.00130.49870.4906…0.46620.46190.00430.43922B 0.4460.4573A0.00000.50000.4919…0.46750.46430.00320.44053B0.44600.45373/8-16/0.375-163/8-20/0.375-203/8-24/0.375-247/16-20/0.4375-207/16-28/0.4375-287/16-32/0.4375-321/2-13/0.500-133/8-28/0.375-283/8-32/0.375-327/16-14/0.4375-147/16-16/0.4375-161/2-16/0.500-161/2-20/0.500-20UN UNEF UNC UN UNC UN UNF UN UNFUNF UNEF UN UNC最大最小最小1最大最小公差范圍最小最大等級允許偏差角最大等級2A 0.00110.49890.4924…0.47570.47200.00370.45632B 0.4610.4703A 0.00000.50000.4935…0.47680.47400.00280.45743B 0.46100.46762A 0.00100.49900.4930…0.47870.47520.00350.46182B 0.4660.4743A 0.00000.50000.4940…0.47970.47710.00260.46283B 0.46600.47191A 0.00160.56090.5437…0.50680.49900.00780.46171B 0.4720.4902A 0.00160.56090.54950.54370.50680.50160.00520.46172B 0.4720.4903A 0.00000.56250.5511…0.50840.50450.00390.46333B 0.47200.48432A 0.00140.56110.5517…0.52050.51580.00470.48662B 0.4950.5093A 0.00000.56250.5531…0.52190.51840.00350.48803B 0.49500.50401A 0.00140.56110.5480…0.52500.51820.00680.49501B 0.5020.5152A 0.00140.56110.5524…0.52500.52050.00450.49502B 0.5020.5153A 0.00000.56250.5538…0.52640.52300.00340.49643B 0.50200.51062A 0.00130.56120.5531…0.52870.52450.00420.50172B 0.5080.5203A 0.00000.56260.5544…0.53000.52680.00320.50303B 0.50800.51622A 0.00120.56130.5541…0.53420.53030.00390.51172B 0.5170.5273A 0.00000.56250.5553…0.53540.53250.00290.51293B 0.5170.52442A 0.00110.56140.5549…0.53820.53450.00370.51882B 0.5240.5323A 0.00000.56250.5560…0.53930.53650.00280.51993B 0.52400.53012A 0.00100.56150.5555…0.54120.53770.00350.52432B 0.5290.5363A 0.00000.56250.5565…0.54220.53960.00260.52533B 0.52900.53441A 0.00160.62340.6052…0.56440.55610.00830.51521B 0.5270.5462A 0.00160.62340.61130.60520.56440.55890.00560.51522B 0.5270.5463A 0.00000.62500.6129…0.56600.56190.00410.51683B 0.52700.53912A 0.00160.62340.6120…0.56930.56390.00540.52422B 0.5350.5533A 0.00000.62500.6136…0.57090.56680.00410.52583B 0.53500.54632A 0.00140.63260.6142…0.58300.57820.00480.54912B 0.5570.5713A 0.00000.62500.6156…0.58440.58080.00360.55053B 0.55700.56621A 0.00140.62360.6105…0.58750.58050.00700.55751B 0.5650.5782A 0.00140.62360.6149…0.58750.58280.00470.55752B 0.5650.5783A0.00000.62500.6163…0.58890.58540.00350.55893B0.5650.57309/16-12/0.5625-129/16-16/0.5625-169/16-18/0.5625-189/16-20/0.5625-201/2-28/0.500-281/2-32/0.500-325/8-12/0.625-125/8-16/0.625-165/8-18/0.625-189/16-24/0.5625-249/16-28/0.5625-289/16-32/0.5625-325/8-11/0.625-11UNEF UN UNEF UN UN UNC UNC UN UNF UN UN UN UNF最大最小最小1最大最小公差范圍最小最大等級允許偏差角最大等級2A 0.00130.62370.6156…0.59120.58690.00430.56422B 0.5710.5823A 0.00000.62500.6169…0.59250.58930.00320.56553B 0.57100.57872A 0.00120.62380.6166…0.59670.59270.0040057422B 0.5800.5903A 0.00000.62500.6178…0.59790.59490.00300.57543B 0.58000.58692A 0.00110.62390.6174…0.60070.59690.00380.58132B 0.5860.5953A 0.00000.62500.6185…0.60180.59900.00280.58243B 0.58600.59262A 0.00110.62390.6179…0.60360.60000.00360.58672B 0.5910.5903A 0.00000.62500.6190…0.60470.60200.00270.58783B 0.59100.59692A 0.00160.68590.6745…0.63180.62640.00540.58672B 0.5970.6153A 0.00000.68750.6761…0.63340.62930.00410.58833B 0.5970.60852A 0.00140.68610.6767…0.64550.64070.00480.61162B 0.6200.6343A 0.00000.68750.6781…0.64690.64330.00360.61303B 0.62000.62842A 0.00130.68820.6781…0.65370.64940.00430.62672B 0.6330.6453A 0.00000.68750.6794…0.65500.65180.00320.62803B 0.63300.64122A 0.00120.68630.6791…0.65920.65520.00400.63672B 0.6420.6523A 0.00000.68750.6803…0.66040.65740.00300.63793B 0.64200.64942A 0.00110.68640.6799…0.66320.65940.00380.64382B 0.6490.6573A 0.00000.68750.6810…0.66430.66150.00280.64493B 0.64900.65512A 0.00110.68640.6804…0.66610.66250.00380.64922B 0.6540.6613A 0.00000.68750.6815…0.66720.66450.00270.65033B 0.65400.65941A 0.00180.74820.7288…0.68320.67440.00880.62911B 0.6420.6632A 0.00180.74820.73530.72880.68320.67730.00590.62912B 0.6420.6633A 0.00000.75000.7371…0.68500.68060.00440.63093B 0.64200.65452A 0.00170.74830.7369…0.69420.68870.00550.64912B 0.6600.6783A 0.00000.75000.7386…0.69590.69180.00410.65083B 0.66000.67071A 0.00150.74850.7343…0.70790.70040.00750.67401B 0.6820.6962A 0.00150.74850.7391…0.70790.70290.00500.67402B 0.6820.6963A 0.00000.75000.7406…0.70940.70560.00380.67553B 0.68200.69082A 0.00130.74870.7406…0.71620.71180.00440.68922B 0.6960.7073A0.00000.75000.7419…0.71750.71420.00330.69053B0.69600.70375/8-20/0.625-2011/16-16/0.6875-1611/16-20/0.6875-2011/16-24/0.6875-2411/16-28/0.6875-285/8-24/0.625-245/8-28/0.625-285/8-32/0.625-3211/16-12/0.6875-123/4-20/0.750-2011/16-32/0.6875-323/4-10/0.750-103/4-12/0.750-123/4-16/0.750-16UNEF UN UN UN UN UN UNC UN UNF UN UN UNEF UN UN最大最小最小1最大最小公差范圍最小最大等級允許偏差角最大等級2A 0.00120.74880.7423…0.72560.72180.00380.70622B 0.7110.7203A 0.00000.75000.7435…0.72680.72390.00290.70743B 0.71100.71762A 0.00110.74890.7429…0.72860.72500.00360.71172B 0.7160.7243A 0.00000.75000.7440…0.72970.72700.00270.71283B 0.71600.72192A 0.00170.81080.7994…0.75670.75120.00550.71162B 0.7220.7403A 0.00000.81250.8011…0.75840.75430.00410.71333B 0.72200.73292A 0.00150.81100.8016…0.77040.76550.00490.73652B 0.7450.7593A 0.00000.81250.8031…0.77190.76830.00360.73803B 0.74500.75332A 0.00130.81120.8031…0.77870.77430.00440.75172B 0.7580.7703A 0.00000.81250.8044…0.78000.77670.00330.75303B 0.75800.76622A 0.00120.81130.8048…0.78810.78430.00380.76872B 0.7740.7823A 0.00000.81250.8060…0.78930.78640.00290.76993B 0.77400.78012A 0.00110.81140.8054…0.79110.78750.00360.77422B 0.7790.7863A 0.00000.81250.8065…0.79220.78950.00270.77533B 0.77900.78441A 0.00190.87310.8523…0.80090.79140.00950.74081B 0.7550.7782A 0.00190.87310.85920.85230.80090.79460.00630.74082B 0.7550.7783A 0.00000.87500.8611…0.80280.79810.00470.74273B 0.75500.76812A 0.00170.87330.8619…0.81920.81370.00550.77412B 0.7850.8033A 0.00000.87500.8636…0.82090.81680.00410.77583B 0.78500.79481A 0.00160.87340.8579…0.82700.81890.00810.78841B 0.7980.8142A 0.00160.87340.8631…0.82700.82160.00540.78842B 0.7980.8143A 0.00000.87500.8647…0.82860.82450.00410.79003B 0.79800.80682A 0.00150.87350.8641…0.83290.82800.00490.79002B 0.8070.8213A 0.00000.87500.8656…0.83440.83080.00360.80053B 0.80700.81582A 0.00130.87370.8656…0.84120.83680.00440.81422B 0.8210.8323A 0.00000.87500.8669…0.84250.83920.00330.81553B 0.82100.82872A 0.00120.87380.8673…0.85060.84680.00380.83122B 0.8360.8453A 0.00000.87500.8685…0.85180.84890.00290.83243B 0.83600.84262A 0.00110.87390.8679…0.85360.85000.00360.83672B 0.8410.8493A0.00000.87500.8690…0.85470.85200.00270.83783B0.84100.84693/4-28/0.750-283/4-32/0.750-3213/16-12/0.8125-127/8-9/0.875-97/8-12/0.875-127/8-14/0.875-147/8-16/0.875-1613/16-16/0.8125-1613/16-20/0.8125-2013/16-28/0.8125-2813/16-32/0.8125-327/8-20/0.875-207/8-28/0.875-287/8-32/0.875-32UN UNEF UN UN UN UN UN UNEF UN UNUNC UN UNF UN最大最小最小1最大最小公差范圍最小最大等級允許偏差角最大等級2A 0.00170.93580.9244…0.88170.87600.00570.83662B 0.8470.8653A 0.00000.93750.9261…0.88340.87930.00410.83833B 0.84700.85752A 0.00150.93600.9266…0.89540.89040.00500.86152B 0.8700.8843A 0.00000.93750.9281…0.89690.89320.00370.86303B 0.87000.87832A 0.00140.93610.9280…0.90360.89910.00450.87662B 0.8830.8953A 0.00000.93750.9294…0.90500.90160.00340.87803B 0.88300.89122A 0.00120.93630.9298…0.91310.90910.00400.89372B 0.8990.9073A 0.00000.93750.9310…0.91430.91130.00300.89493B 0.89900.90512A 0.00110.93640.9304…0.91610.91230.00380.89922B 0.9040.9113A 0.00000.93750.9315…0.91720.91440.00280.90033B 0.90400.90941A 0.00200.99800.9755…0.91680.90670.01010.84921B 0.8650.8902A 0.00200.99800.98300.97550.91680.91000.00680.84922B 0.8650.8903A 0.0000 1.00000.9850…0.91880.91370.00510.85123B 0.86500.87971A 0.00180.99820.9810…0.94410.93530.00880.89901B 0.9100.9282A 0.00180.99820.9868…0.94410.93820.00590.89902B 0.9100.9283A 0.0000 1.00000.9886…0.94590.94150.00440.90083B 0.91000.91981A 0.00170.99830.9828…0.95190.94350.00840.91321B 0.9230.9382A 0.00170.99830.9880…0.95190.94630.00560.91322B 0.9230.9383A 0.0000 1.00000.9897…0.95360.94940.00420.91493B 0.92300.93162A 0.00150.99850.9891…0.95790.95290.00500.92402B 0.9320.9463A 0.0000 1.00000.9906…0.95940.95570.00370.92553B 0.93200.94082A 0.00140.99860.9905…0.96610.96160.00450.93912B 0.9460.9573A 0.0000 1.00000.9919…0.96750.96410.00340.94053B 0.94600.95372A 0.00120.99880.9923…0.97560.97160.00400.95622B 0.9610.9703A 0.0000 1.00000.9935…0.97680.97380.00300.95743B 0.96100.96762A 0.00110.99890.9929…0.97860.97480.00380.96172B 0.9660.9743A 0.0000 1.00000.9940…0.97970.97690.00280.96283B 0.96600.97192A 0.0020 1.0605 1.0455…0.97930.97250.00680.91172B 0.9270.9523A0.00001.06251.0475…0.98130.97620.00510.91373B0.92700.942215/16-16/0.9375-1615/16-20/0.9375-2015/16-28/0.9375-2815/16-32/0.9375-3215/16-12/0.9375-121-20/1.000-201-28/1.000-281-32/1.000-321-1/16-8/1.0625-81-8/1.000-81-12/1.000-121-14/1.000-141-16/1.000-16UN UNCUNFUNS(5)UN UN UNEF UN UN UNEF UN UN UN最大最小最小1最大最小公差范圍最小最大等級允許偏差角最大等級2A 0.0017 1.0608 1.0494… 1.0067 1.00100.00570.96162B 0.9720.9903A 0.0000 1.0625 1.0511… 1.0084 1.00420.00420.96333B 0.97200.98232A 0.0015 1.0610 1.0516… 1.0204 1.01540.00500.98652B 0.995 1.0093A 0.0000 1.0625 1.0531… 1.0219 1.01820.00370.98803B 0.9950 1.00332A 0.0014 1.0611 1.0524… 1.0250 1.02030.00470.99502B 1.002 1.0153A 0.0000 1.0625 1.0538… 1.0264 1.02280.00360.99643B 1.0020 1.01052A 0.0014 1.0611 1.0530… 1.0286 1.02410.0045 1.00162B 1.008 1.0203A 0.0000 1.0625 1.0544… 1.0300 1.02660.0034 1.00303B 1.0080 1.01622A 0.0012 1.0613 1.0548… 1.0381 1.03410.0040 1.01872B 1.024 1.0323A 0.0000 1.0625 1.0560… 1.0393 1.03630.0030 1.01993B 1.0240 1.03011A 0.0022 1.1228 1.0982… 1.0300 1.0191 1.01090.95271B 0.9700.9982A 0.0022 1.1228 1.1064 1.0982 1.0300 1.02280.00720.95272B 0.9700.9983A 0.0000 1.1250 1.1086… 1.0322 1.02680.00540.95493B 0.97000.98752A 0.0021 1.1229 1.1079 1.1004 1.0417 1.03480.00690.97412B 0.990 1.0153A 0.0000 1.1250 1.1100… 1.0438 1.03860.00520.97623B 0.9900 1.00471A 0.0018 1.1232 1.1060… 1.0691 1.06010.0090 1.02401B 1.035 1.0532A 0.0018 1.1232 1.1118… 1.0691 1.06310.0060 1.02402B 1.035 1.0533A 0.0000 1.1250 1.1136… 1.0709 1.06640.0045 1.02583B 1.0350 1.04482A 0.0015 1.1235 1.1141… 1.0829 1.07790.0050 1.04902B 1.057 1.0713A 0.0000 1.1250 1.1156… 1.0844 1.08070.00370.05053B 1.0570 1.06582A 0.0014 1.1236 1.1149… 1.0875 1.08280.0047 1.05752B 1.065 1.0783A 0.0000 1.1250 1.1163… 1.0889 1.08530.0036 1.05893B 1.0650 1.07302A 0.0014 1.1236 1.1155… 1.0911 1.08660.0045 1.06412B 1.071 1.0823A 0.0000 1.1250 1.1169… 1.0925 1.08910.0034 1.06553B 1.0710 1.07872A 0.0012 1.1238 1.1173… 1.1006 1.09660.0040 1.08122B 1.086 1.0953A 0.0000 1.1250 1.1185… 1.1018 1.09880.0030 1.08243B 1.0860 1.09262A 0.0021 1.1854 1.1704… 1.1042 1.09720.0070 1.03662B 1.052 1.0773A 0.0000 1.1875 1.1725… 1.1063 1.10110.0052 1.03873B 1.0520 1.06722A 0.0017 1.1858 1.1744… 1.1317 1.12590.0058 1.08662B 1.097 1.1153A0.00001.18751.1761…1.13341.12910.0043 1.08833B1.0970 1.10731-1/16-28/1.0625-281-1/8-7/1.125-71-1/8-8/1.125-81-1/8-12/1.125-121-1/16-12/1.0625-121-1/16-16/1.0625-161-1/16-18/1.0625-181-1/16-20/1.0625-201-3/16-8/1.1875-81-3/16-12/1.1875-121-1/8-16/1.125-161-1/8-18/1.125-181-1/8-20/1.125-201-1/8-28/1.125-28UN UN UNEF UN UN UNEF UN UN UN UNC UN UNF UN UN最大最小最小1最大最小公差范圍最小最大等級允許偏差角最大等級2A 0.0015 1.1860 1.1766… 1.1454 1.14030.0051 1.11152B 1.120 1.1343A 0.0000 1.1875 1.1781… 1.1469 1.14310.0038 1.11303B 1.1200 1.12832A 0.0015 1.1860 1.1773… 1.1499 1.14500.0049 1.11992B 1.127 1.1403A 0.0000 1.1875 1.1788… 1.1514 1.14780.0036 1.12143B 1.1270 1.13552A 0.0014 1.1861 1.1780… 1.1536 1.14890.0047 1.12662B 1.133 1.1453A 0.0000 1.1875 1.1794… 1.1550 1.15150.0035 1.12803B 1.1330 1.14122A 0.0012 1.1863 1.1798… 1.1631 1.15900.0041 1.14372B 1.149 1.1573A 0.0000 1.1875 1.1810… 1.1643 1.16120.0031 1.14493B 1.1490 1.15511A 0.0022 1.2478 1.2232… 1.1550 1.14390.0111 1.07771B 1.095 1.1232A 0.0022 1.2478 1.2314 1.2232 1.1550 1.14760.0074 1.07772B 1.095 1.1233A 0.0000 1.2500 1.2336… 1.1572 1.15170.0055 1.07993B 1.0950 1.11252A 0.0021 1.2479 1.2329 1.2254 1.1667 1.15970.0070 1.09912B 1.115 1.1403A 0.0000 1.2500 1.2350… 1.1688 1.16350.0053 1.10123B 1.1150 1.12971A 0.0018 1.2482 1.2310… 1.1941 1.18490.0092 1.14901B 1.160 1.1782A 0.0018 1.2482 1.2368… 1.1941 1.18790.0062 1.14902B 1.160 1.1783A 0.0000 1.2500 1.2386… 1.1959 1.19130.0046 1.15083B 1.1600 1.16982A 0.0015 1.2485 1.2391… 1.2079 1.20280.0051 1.17402B 1.182 1.1963A 0.0000 1.2500 1.2406… 1.2094 1.20560.0038 1.17553B 1.1820 1.19082A 0.0015 1.2485 1.2398… 1.2124 1.20750.0049 1.18242B 1.190 1.2033A 0.0000 1.2500 1.2413… 1.2139 1.21030.0036 1.18393B 1.1900 1.19802A 0.0014 1.2486 1.2405… 1.2161 1.21140.0047 1.18912B 1.196 1.2073A 0.0000 1.2500 1.2419… 1.2175 1.21400.0035 1.19053B 1.1960 1.20372A 0.0012 1.2488 1.2423… 1.2256 1.22150.0041 1.20622B 1.211 1.2203A 0.0000 1.2500 1.2435… 1.2268 1.22370.0031 1.20743B 1.2110 1.21762A 0.0021 1.3104 1.2954… 1.2292 1.22210.0071 1.16162B 1.177 1.2023A 0.0000 1.3125 1.2975… 1.2313 1.22600.0053 1.16373B 1.1770 1.19222A 0.0017 1.3108 1.2994… 1.2567 1.25090.0058 1.21162B 1.222 1.2403A 0.0000 1.3125 1.3011… 1.2584 1.25410.0043 1.21333B 1.2220 1.23232A 0.0015 1.3110 1.3016… 1.2704 1.26530.0051 1.23652B 1.245 1.2593A0.00001.31251.3031…1.27191.26810.0038 1.23803B1.2450 1.25331-3/16-16/1.1875-161-3/16-18/1.1875-181-1/4-12/1.250-121-1/4-16/1.250-161-1/4-18/1.250-181-1/4-20/1.250-201-3/16-20/1.1875-201-3/16-28/1.1875-281-1/4-7/1.250-71-1/4-8/1.250-81-1/4-28/1.250-281-5/16-8/1.3125-81-5/16-12/1.3125-121-5/16-16/1.3125-16UN UN UNC UN UN UNEF UN UN UN UNUNF UN UNEF UN最大最小最小1最大最小公差范圍最小最大等級允許偏差角最大等級2A 0.0015 1.3110 1.3023… 1.2749 1.27000.0049 1.24492B 1.252 1.2653A 0.0000 1.3125 1.3038… 1.2764 1.27280.0036 1.24643B 1.2520 1.26052A 0.0014 1.3111 1.3030… 1.2786 1.27390.0047 1.25162B 1.258 1.2703A 0.0000 1.3125 1.3044… 1.2800 1.27650.0035 1.25303B 1.2580 1.26622A 0.0012 1.3113 1.3048… 1.2881 1.28400.0041 1.26872B 1.274 1.2823A 0.0000 1.3125 1.3060… 1.2893 1.28620.0031 1.26993B 1.2740 1.28011A 0.0024 1.3726 1.3453… 1.2643 1.25230.0120 1.17421B 1.195 1.2252A 0.0024 1.3726 1.3544 1.3453 1.2643 1.25630.0080 1.17422B 1.195 1.2253A 0.0000 1.3750 1.3568… 1.2667 1.26070.0060 1.17663B 1.1950 1.21462A 0.0022 1.3728 1.3578 1.3503 1.2916 1.28440.0072 1.22402B 1.240 1.2653A 0.0000 1.3750 1.3600… 1.2938 1.28840.0054 1.22623B 1.2400 1.25471A 0.0019 1.3731 1.3559… 1.3190 1.30960.0094 1.27391B 1.285 1.3032A 0.0019 1.3731 1.3617… 1.3190 1.31270.0063 1.27392B 1.285 1.3033A 0.0000 1.3750 1.3636… 1.3209 1.31620.0047 1.27583B 1.2850 1.29482A 0.0015 1.3735 1.3641… 1.3329 1.32780.0051 1.29902B 1.307 1.3213A 0.0000 1.3750 1.3656… 1.3344 1.33060.0038 1.30053B 1.3070 1.31582A 0.0015 1.3735 1.3648… 1.3374 1.33250.0049 1.30742B 1.315 1.3283A 0.0000 1.3750 1.3663… 1.3389 1.33530.0036 1.30893B 1.3150 1.32302A 0.0014 1.3736 1.3655… 1.3411 1.33640.0047 1.31412B 1.321 1.3323A 0.0000 1.3750 1.3669… 1.3425 1.33900.0035 1.31553B 1.3210 1.32872A 0.0012 1.3738 1.3673… 1.3506 1.34650.0041 1.33122B 1.336 1.3453A 0.0000 1.3750 1.3685… 1.3518 1.34870.0031 1.33243B 1.3360 1.34262A 0.0024 1.4351 1.4169… 1.3268 1.31880.0080 1.23672B 1.257 1.2883A 0.0000 1.4375 1.4193… 1.3292 1.32320.0060 1.23913B 1.2570 1.27712A 0.0022 1.4353 1.4203… 1.3541 1.34690.0072 1.28652B 1.302 1.3273A 0.0000 1.4375 1.4225… 1.3563 1.35090.0054 1.28873B 1.3020 1.31722A 0.0018 1.4357 1.4243… 1.3816 1.37570.0059 1.33652B 1.347 1.3653A 0.0000 1.4375 1.4261… 1.3834 1.37900.0044 1.33833B 1.3470 1.35732A 0.0016 1.4359 1.4265… 1.3953 1.39010.0052 1.36142B 1.370 1.3843A0.00001.43751.4281…1.39691.39300.0039 1.36303B1.3700 1.37831-5/16-18/1.3125-181-5/16-20/1.3125-201-5/16-28/1.3125-281-3/8-6/1.375-61-3/8-20/1.375-201-3/8-28/1.375-281-7/16-6/1.4375-61-7/16-8/1.4375-81-3/8-8/1.375-81-3/8-12/1.375-121-3/8-16/1.375-161-3/8-18/1.375-181-7/16-12/1.4375-121-7/16-16/1.4375-16UN UNF UN UNEF UNEF UN UN UNC UNUN UN UN UN UN最大最小最小1最大最小公差范圍最小最大外螺紋内螺紋外 徑中 徑孔 徑等級允許偏差外徑倒角最大等級螺紋规格螺紋型式2A 0.0015 1.4360 1.4273… 1.3999 1.39490.0050 1.36992B 1.377 1.3903A 0.0000 1.4375 1.4288… 1.4014 1.39770.0037 1.37143B 1.3770 1.38552A 0.0014 1.4361 1.4280… 1.4036 1.39880.0048 1.37662B 1.383 1.3953A 0.0000 1.4375 1.4294… 1.4050 1.40140.0036 1.37803B 1.3830 1.39122A 0.0013 1.4362 1.4297… 1.4130 1.40880.0042 1.39362B 1.399 1.4073A 0.0000 1.4375 1.4310… 1.4143 1.41120.0031 1.39493B 1.3990 1.40511A 0.0024 1.4976 1.4703… 1.3893 1.37720.0121 1.29921B 1.320 1.3502A 0.0024 1.4976 1.4794 1.4703 1.3893 1.38120.0081 1.29922B 1.320 1.3503A 0.0000 1.5000 1.4818… 1.3917 1.38560.0061 1.30163B 1.3200 1.33962A 0.0022 1.4978 1.4828 1.4753 1.4166 1.40930.0073 1.34902B 1.365 1.3903A 0.0000 1.5000 1.4850… 1.4188 1.41330.0055 1.35123B 1.3650 1.37971A 0.0019 1.4981 1.4809… 1.4440 1.43440.0096 1.39891B 1.410 1.4282A 0.0019 1.4981 1.4867… 1.4440 1.43760.0064 1.39892B 1.410 1.4283A 0.0000 1.5000 1.4886… 1.4459 1.44110.0048 1.40083B 1.4100 1.41982A 0.0016 1.4984 1.4890… 1.4578 1.45260.0052 1.42392B 1.432 1.4463A 0.0000 1.5000 1.4906… 1.4594 1.45550.0039 1.42553B 1.4320 1.44082A 0.0015 1.4985 1.4898… 1.4624 1.45740.0050 1.43242B 1.440 1.4523A 0.0000 1.5000 1.4913… 1.4639 1.46020.0037 1.43393B 1.4400 1.44802A 0.0014 1.4986 1.4905… 1.4661 1.46130.0048 1.43912B 1.446 1.4573A 0.0000 1.5000 1.4919… 1.4675 1.46390.0036 1.44053B 1.4460 1.45372A 0.0013 1.4987 1.4922… 1.4755 1.47130.0042 1.45612B 1.461 1.4703A0.00001.50001.4935…1.47681.47370.0031 1.45743B1.4610 1.46761-1/2-20/1.500-201-1/2-28/1.500-281-7/16-28/1.4375-281-1/2-6/1.500-61-1/2-8/1.500-81-1/2-12/1.500-121-1/2-16/1.500-161-1/2-18/1.500-181-7/16-18/1.4375-181-7/16-20/1.4375-20UNEF UN UN UNEF UN UNUN UNC UN UNF角最小最小最大公差范圍0.05190.05420.00230.0600 0.05190.05360.00170.0600 0.06290.06550.00260.0730 0.06290.06480.00190.0730 0.06400.06650.00250.0730 0.06400.06590.00190.0730 0.07440.07720.00280.0860 0.07440.07650.00210.0860 0.07590.07860.00270.0860 0.07590.07790.00200.0860 0.08550.08850.00300.0990 0.08550.08770.00220.0990 0.08740.09020.00280.0990 0.08740.08950.00210.0990 0.09580.09910.00330.1120 0.09580.09820.00240.1120 0.09850.10160.00310.1120 0.09850.10080.00230.1120 0.10880.11210.00330.1250 0.10880.11130.00250.1250 0.11020.11340.00320.1250 0.11020.11260.00240.1250 0.11770.12140.00370.1380 0.11770.12040.00270.1380 0.12180.12520.00340.1380 0.12180.12430.00250.1380 0.14370.14750.00380.1640 0.14370.14650.00280.1640 0.14600.14960.00360.1640 0.14600.14870.00270.1640最小最大公差范圍角最小0.16290.16720.00430.1900 0.16290.16610.00320.1900 0.16970.17360.00390.1900 0.16970.17260.00290.1900 0.18890.19330.00440.2160 0.18890.19220.00330.2160 0.19280.19700.00420.2160 0.19280.19590.00310.2160 0.19570.19980.00410.2160 0.19570.19880.00310.2160 0.21750.22480.00730.2500 0.21750.22240.00490.2500 0.21750.22110.00360.2500 0.22680.23330.00650.2500 0.22680.23110.00430.2500 0.22680.23000.00320.2500 0.22970.23390.00420.2500 0.22970.23280.00310.2500 0.27640.28430.00790.3125 0.27640.28170.00530.3125 0.27640.28030.00390.3125 0.28000.28520.00570.3125 0.28000.28390.00390.3125 0.28540.29250.00710.3125 0.28540.29020.00480.3125 0.28540.28900.00360.3125 0.28930.29370.00440.3125 0.28930.29260.00330.3125 0.29220.29640.00420.3125 0.29220.29530.00310.3125最小最大公差范圍角最小0.33440.34290.00850.3750 0.33440.34010.00570.3750 0.33440.33870.00430.3750 0.34250.34790.00540.3750 0.34250.34650.00400.3750 0.34790.35530.00740.3750 0.34790.35280.00490.3750 0.34790.35160.00370.3750 0.35180.35640.00460.3750 0.35180.35530.00350.3750 0.35470.35910.00440.3750 0.35470.35800.00330.3750 0.39110.40030.00920.4375 0.39110.39720.00610.4375 0.39110.39570.00460.4375 0.39690.40280.00590.4375 0.39690.40140.00450.4375 0.40500.41310.00810.4375 0.40500.41040.00540.4375 0.40500.40910.00410.4375 0.41430.41890.00460.4375 0.41430.41780.00350.4375 0.41720.42160.00440.4375 0.41720.42050.00330.4375 0.45000.45970.00970.5000 0.45000.45650.00650.5000 0.45000.45480.00480.5000 0.45940.46550.00610.5000 0.45940.46400.00460.5000 0.46750.47590.00840.5000 0.46750.47310.00560.5000 0.46750.47170.00420.5000最小最大公差范圍角最小0.47680.48160.00480.5000 0.47680.48040.00360.5000 0.47970.48420.00450.5000 0.47970.48310.00340.5000 0.50840.51860.01020.5625 0.50840.51520.00680.5625 0.50840.51350.00510.5625 0.52190.52800.00610.5625 0.52190.52650.00460.5625 0.52640.53530.00890.5625 0.52640.53230.00590.5625 0.52640.53080.00440.5625 0.53000.53550.00550.5625 0.53000.53410.00410.5625 0.53540.54050.00510.5625 0.53540.53920.00380.5625 0.53930.54410.00480.5625 0.53930.54290.00360.5625 0.54220.54670.00450.5625 0.54220.54560.00340.5625 0.56600.57670.01070.6250 0.56600.57320.00720.6250 0.56600.57140.00540.6250 0.57090.57800.00710.6250 0.57090.57620.00530.6250 0.58440.59060.00620.6250 0.58440.58900.00460.6250 0.58890.59800.00910.6250 0.58890.59490.00600.6250 0.58890.59340.00450.6250最小最大公差范圍角最小0.59250.59810.00560.6250 0.59250.59670.00420.6250 0.59790.60310.00520.6250 0.59790.60180.00390.6250 0.60180.60670.00490.6250 0.60180.60550.00370.6250 0.60470.60930.00460.6250 0.60470.60820.00350.6250 0.63340.64050.00710.6875 0.63340.63870.00530.6875 0.64690.65310.00620.6875 0.64690.65150.00460.6875 0.65500.66060.00560.6875 0.65500.65920.00420.6875 0.66040.66560.00520.6875 0.66040.66430.00390.6875 0.66430.66920.00490.6875 0.66430.66800.00370.6875 0.66720.67180.00460.6875 0.66720.67070.00350.6875 0.68500.69650.01150.7500 0.68500.69270.00770.7500 0.68500.69070.00570.7500 0.69590.70310.00720.7500 0.69590.70130.00540.7500 0.70940.71920.00980.7500 0.70940.71590.00650.7500 0.70940.71430.00490.7500 0.71750.72320.00570.7500 0.71750.72180.00430.7500最小最大公差范圍角最小0.72680.73180.00500.7500 0.72680.73050.00370.7500 0.72970.73440.00470.7500 0.72970.73330.00360.7500 0.75840.76560.00720.8125 0.75840.76380.00540.8125 0.77190.77820.00630.8125 0.77190.77660.00470.8125 0.78000.78570.00570.8125 0.78000.78430.00430.8125 0.78930.79430.00500.8125 0.78930.79300.00370.8125 0.79220.79690.00470.8125 0.79220.79580.00360.8125 0.80280.81510.01230.8750 0.80280.81100.00820.8750 0.80280.80890.00610.8750 0.82090.82810.00720.8750 0.82090.82630.00540.8750 0.82860.83920.01060.8750 0.82860.83560.00700.8750 0.82860.83390.00530.8750 0.83440.84070.00630.8750 0.83440.83910.00470.8750 0.84250.84820.00570.8750 0.84250.84680.00430.8750 0.85180.85680.00500.8750 0.85180.85550.00370.8750 0.85470.85940.00470.8750 0.85470.85830.00360.8750。
各国标准螺纹基本尺寸对照表
英制管螺纹基本尺寸及公差（牙形角55o）BSPP英制锥管螺纹基本尺寸及公差（牙形角55o）BSPT美制管螺纹基本尺寸及公差（牙形角60o）UN(F)公制螺纹基本尺寸及公差(牙形角60o) M55°圆锥管螺纹基本尺寸对照表最新下载-汇兴达55°圆锥管螺纹基本尺寸对照表最新下载-汇兴达55°圆锥管螺纹(BSPT)2R3" 113R4" 114R5" 115R6" 116聊城市鑫茂祥管业有限公司专业经营钢管规格：5mm*1mm—1020mm*200mm合金钢管、外径22mm-127mm冷轧无缝钢管、外径127mm-600mm，壁厚16mm-100mm，外径精度±%,壁厚精度±5%热轧中厚壁无缝钢管、16Mn外径400—1600mm、壁厚20—60mm的大口径厚壁卷管，可定尺到16米及各种规格的无缝方管、异型无缝钢管等.常备钢管种类有:构造用无缝钢管、流体用无缝钢管、液压无缝钢管、电力用无缝钢管、石油输送用无缝钢管、化肥设备用无缝钢管、煤矿用无缝钢管、不锈钢无缝钢管、化工用无缝钢管、纺织机械用无缝钢管、汽车；水利用无缝钢管，精密无缝钢管、光亮无缝钢管、军工医疗用无缝钢管、管道用无缝钢管、支柱用无缝钢管、合金无缝管、高压无缝管、大口径直缝焊管等。
适用于工程、煤矿、纺织、电力、锅炉、机械、军工等各个领域。
公司以良好的信用、优质的产品、雄厚的实力、低廉的价钱享誉全国30多个省、市、自治区、直辖市及国外，产品深得用户依赖。
管螺纹的基本尺寸表(2010-10-25 15:57:35)标签：表（1）螺纹基本尺寸G1/2、ZG1/2 (单位:mm)尺寸代每类的螺距p 牙型圆弧半基面上的基本直径基准有效锥管螺纹的基本尺寸表（3-28）1/2PT、1/2NPT 表（2）螺纹基本尺寸(单位:mm)寸Ww 牙型代号大径mmd=D螺距mmp每英寸牙数tpi中径mmd2=D2小径外螺纹d3牙型高H1底孔直径mm1/16" BSW 603/32" BSW 481/8" BSW 405/32" BSW 323/16" BSW 247/32" BSW 241/4" BSW 205/16" BSW 183/8" BSW 167/16" BSW 141/2" BSW 125/8" BSW 113/4" BSW 107/8" BSW 9 1" BSW 811/8" BSW 711/4" BSW 713/8" BSW 611/2" BSW 615/8" BSW 513/4" BSW 517/8" BSW 41/2 2" BSW 41/2 21/4" BSW 421/2" BSW 423/4" BSW 31/2 3" BSW 31/2 31/4" BSW 31/4 31/2" BSW 31/4 33/4" BSW 3 4" BSW 341/4" BSW 27/841/2" BSW 27/8 43/4" BSW 23/4 5" BSW 23/4 51/4" BSW 25/8 51/2" BSW 25/8 53/4" BSW 21/2 6" BSW 21/2英制普通螺纹--细牙--BSF英制普通螺纹(惠氏螺纹)--细牙(BSW)名义尺寸BSF 牙型代号大径mmd=D螺距mmp每英寸牙数tpi中径mmd2=D2小径外螺纹d3牙型高H1底孔直径mm3/16 BSF 32 7/32 BSF 28 1/4 BSF 26 9/32 BSF 26 5/16 BSF 22 3/8 BSF 20 7/16 BSF 18 1/2 BSF 16 9/16 BSF 16 5/8 BSF 14 11/16 BSF 14 3/4 BSF 12 13/16 BSF 12 7/8 BSF 11 1 BSF 10 11/8 BSF 9 11/4 BSF 9 13/8 BSF 8 11/2 BSF 8 15/8 BSF 8 13/4 BSF 7 2 BSF 7 21/4 BSF 6 21/2 BSF 623/4 BSF 6 -3 BSF 5 -31/4 BSF 5 -31/2 BSF 41/2 -33/4 BSF 41/2 -4 BSF 41/2 -41/4 BSF 4 -螺纹标记的标注当螺纹精度要求较高时，除标注螺纹代号外，还应标注螺纹公差带代号和螺纹旋合长度。
螺纹规格-美制、英制、公制对照表
21.732
0.236
20.376
20.676
0.300
8
M24*1.5
23.968
23.732
0.236
22.376
22.676
0.300
9
M26*1.5
25.968
25.732
0.236
24.376
24.676
0.300
10
M27*1.5
26.968
26.732
0.236
25.376
实用标准螺纹规格美制英制公制美制细牙unf2a外螺纹大径unfun2b内螺纹小径ununf序号规格型号最大最小公差最小最大公差71620110791087402069728100330305122012667124610206113281160802799161814252140310221127511308103303416190121877302391732317678035678142218421923026220269206760406161226944266550290246892514604571612332943300502903103931496045781241229409400290389893944604578124757947290029045339457960457102126345263162029061214616710457公制细牙6g外螺纹大径6h内螺纹小径m101997497940180891791570240m12151196811732023610376106760300m14151396813732023612376126760300m16151596815732023614376146760300m18151796817732023616376166760300m20151996819732023618376186760300m22152196821732023620376206760300m24152396823732023622376226760300m2615259682573202362437624676030010m2715269682673202362537625676030011m3015299682973202362837628676030012m272269622668202802483525210037513m302299622968202802783528210037514m332329623268202803083531210037515m362359623568202803383534210037516m4224196241682028039835402100375英制管螺纹g1828972895140214856688480282g14191315712907025011445118900445g38191666216412025014950
各国标准螺纹基本尺寸对照表
英制管螺纹基本尺寸及公差（牙形角55º）BSPP英制锥管螺纹基本尺寸及公差（牙形角55º）BSPT美制管螺纹基本尺寸及公差（牙形角60º）UN(F)公制螺纹基本尺寸及公差(牙形角60º) M55°圆锥管螺纹基本尺寸对照表最新下载-汇兴达55°圆锥管螺纹基本尺寸对照表最新下载-汇兴达55°圆锥管螺纹(BSPT)2 R5 5"138.432.30911136.951135.4721.479R66"163.832.30911162.351160.8721.479聊城市鑫茂祥管业有限公司专业经营钢管规格：5mm*1mm—1020mm*200mm合金钢管、外径22mm-127mm冷轧无缝钢管、外径127mm-600mm.壁厚16mm-100mm.外径精度±0.5%,壁厚精度±5%热轧中厚壁无缝钢管、16Mn外径400—1600mm、壁厚20—60mm 的大口径厚壁卷管.可定尺到16米及各种规格的无缝方管、异型无缝钢管等.常备钢管种类有:构造用无缝钢管、流体用无缝钢管、液压无缝钢管、电力用无缝钢管、石油输送用无缝钢管、化肥设备用无缝钢管、煤矿用无缝钢管、不锈钢无缝钢管、化工用无缝钢管、纺织机械用无缝钢管、汽车；水利用无缝钢管.精密无缝钢管、光亮无缝钢管、军工医疗用无缝钢管、管道用无缝钢管、支柱用无缝钢管、合金无缝管、高压无缝管、大口径直缝焊管等。
适用于工程、煤矿、纺织、电力、锅炉、机械、军工等各个领域。
公司以良好的信用、优质的产品、雄厚的实力、低廉的价钱享誉全国30多个省、市、自治区、直辖市及国外.产品深得用户依赖。
管螺纹的基本尺寸表(2010-10-25 15:57:35)转载▼标签：杂谈表（1）螺纹基本尺寸G1/2 、ZG1/2 (单位:mm)尺寸代号每25.4mm类的牙数n螺距p 牙型高度h圆弧半径r≈基面上的基本直径基准距离有效螺纹长度大径（基准直径）d=D中径d2=D2小径d1=D11/16 28 0.907 0.581 0.125 7.723 7.142 6.561 4.0 6.5 1/8 28 0.907 0.581 0.125 9.728 9.147 8.566 4.0 6.5 1/4 19 1.337 0.586 0.184 13.157 12.301 11.445 6.0 9.7 3/8 19 1.337 0.586 0.184 16.662 15.806 14.950 6.4 10.1 1/2 14 1.814 1.162 0.249 20.955 19.793 18.631 8.2 13.2锥管螺纹的基本尺寸表（3-28）1/2PT 、1/2NPT表（2）螺纹基本尺寸 (单位:mm)螺纹标准的一种.按外形分圆柱、圆锥两种；按牙型角分55°、60°两种。
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d——螺纹公称直径（英寸）n——每英寸牙数
【转载】螺纹底孔直径表
英制锥度管用螺纹
管用螺纹规格
JIS B0203
JIS B0203
JIS B 2301
锥度内螺纹Rc(PT)
平行管内螺纹Rp(PS)
锥度管内螺纹
计算数值
底孔直径
计算数值
底孔直径
计算数值
底孔直径
1/16‐28
48
/
/
5#,(1/8”)
3.18
40
44
40
/
6#
3.51
32
40
/
/
8#
4.17
32
36
/
/
10#(3/16”)
4.83
24
32
24
32
12#(7/32”)
5.49
24
28
/
28
1/4”
6.35
20
28
20
26
5/16”
7.94
18
24
18
22
3/8”
9.53
16
20
16
20
7/16”
11.11
18
3/4‐14
23.349
23
23.975
24
23.305
23
1‐11
19.423
29
30.111
30
29.353
29
1 1/4‐11
37.940
38
38.772
39
37.890
38
1 1/2‐11
43.833
44
44.565
45
43.720
43
2‐11
55.412
55
56.476
56
55.406
11.890
11.445
G(PF) 3/8‐19
15.2
15.395
14.950
G(PF) 1/2‐14
19
19.172
18.631
G(PF) 5/8‐14
21
21.130
20.589
G(PF) 3/4‐14
24.5
24.658
24.117
G(PF) 7/8‐14
28.2
28.418
27.877
G(PF) 1‐11
锥度螺纹（NPT）
底孔钻头直径
使用铰刀
不使用铰刀
mm
inch
mm
inch
mm
inch
1/16‐27
5.94
0.234
6.15
0.246
6.35
0.250
1/8‐27
8.33
0.328
8.43
0.332
8.74
0.344
1/4‐18
10.72
0.422
11.13
0.438
11.13
0.438
3/8‐18
133.597
133
6‐11
158.510
159
160.655
161
158.810
158
英制平行管用螺纹（G、PF）
内螺纹最小径（参考）
管用螺纹规格
底孔钻头直径
最大尺寸
最小尺寸
G 1/16‐28
6.7
6.843
6.561
G(PF) 1/8‐28
8.7
8.848
8.566
G(PF) 1/4‐19
11.7
55
2 1/2‐11
70.701
71
72.009
72
70.788
70
3‐11
83.201
83
84.709
85
83.364
83
3 1/2‐11
95.547
96
97.155
97
95.747
95
4‐11
107.834
108
109.855
110
108.322
108
5‐11
133.110
133
135.255
135
56.656
G(PF) 2 1/4‐11
63
63.392
62.752
G(PF) 2 1/2‐11
72
72.866
72.226
G(PF) 2 3/4‐11
78.5
79.216
78.576
G(PF) 3‐11
85
85.566
84.926
G(PF) 3 1/2‐11
97
98.012
97.372
G(PF) 4‐11
英、美制标准螺纹直径、螺距参照系列表
UNC-粗牙
UNF-细牙
标准国别
美制ANSI BI.1-1982
英国标准BS84-1956
规格
直径
UNC牙数/寸
UNF牙数/寸
BSW牙数/寸
BSF牙数/寸
0#
1.52
/
80
/
/
1#
1.85
64
72
/
/
2#
2.18
56
64
/
/
3#
2.51
48
56
/
/
4#
2.84
40
14.27
0.562
14.27
0.562
14.68
0.578
1/2‐14
17.48
0.688
17.86
0.703
18.26
0.719
3/4‐14
22.63
0.891
23.01
0.906
23.42
0.922
1‐11 1/2
28.58
1.125
28.98
1.141
29.36
1.156
1 1/4‐11 1/2
37.31
1.469
37.69
1.484
38.10
1.500
1 1/2‐11 1/2
43.26
1.703
43.66
1.719
44.45
1.750
2‐11 1/2
55.17
2.172
55.58
2.188
56.36
2.219
2 1/2‐8
65.48
2.578
66.27
2.609
67.46
2.656
6.230
6.2
6.490
6.5
－
－
1/8‐28
8.235
8.2
8.495
8.5
8.191
8.2
1/4‐19
10.941
10.9
11.341
11.4
10.945
10.9
3/8‐19
14.428
14.4
14.846
14.9
14.388
14.4
1/2‐14
17.950
18
18.489
18.5
17.943
30.6
30.931
30.291
G(PF) 1 1/8‐11
35.2
35.579
34.939
G(PF) 1 1/4‐11
39.2
39.592
38.952
G(PF) 1 1/2‐11
45
45.485
44.845
G(PF) 1 3/4‐11
51
51.428
50.788
G(PF) 2‐11
57
57.296
─
110.712
110.072
G(PF) 4 1/2‐11
─
123.412
122.772
G(PF) 5‐11
─
136.112
135.472
G(PF) 5 1/2‐11
─
148.812
148.172
G(PF) 6‐11
─
161.512
160.872
美制标准管用螺纹（NPT、NPS）
管用螺纹规格
平行螺纹(NPS）
t＞1毫米，dz=d-（1.04～1.06)t
式中t——螺距（毫米）
dz——攻丝前钻孔直径（毫米）
d——螺纹公称直径（毫米）
2.攻英制螺纹：
螺纹公称直径铸铁与青铜钢与黄铜
3/16"～5/8" dz＝25（d-1/n) dz＝25（d-1/n)+0.1
3/4"～11/2" dz＝25（d-1/n) dz＝25（d-1/n) +0.2
10
1 1/8”
28.58
7
12
7
9
1 1/4”
31.75
7
12
7
9
1 3/8”
34.93
6
12
/
8
1 1/2"
38.10Leabharlann 61268
1 5/8”
41.28
/
/
/
8
1 3/4”
44.45
5
/
5
7
1 7/8”
47.63
/
/
/
2”
50.80
4.5
/
5
7
螺纹站孔的直径的计算
一般按下列公式：
1.攻公制螺纹：螺距t<1毫米，dz=d-t
14
20