2018英制螺纹对照表
螺纹规格-美制、英制、公制对照表
螺纹规格-美制、英制、公制美制细牙UNF 2A 外螺纹大径UNFUN 2B内螺纹小径（UN 、UNF ）序号序号规格型号规格型号最大最大最小最小公差公差最小最小最大最大公差公差1 7/16"-20 11.079 10.874 0.206 9.728 10.033 0.305 2 1/2"-20 12.667 12.461 0.206 11.328 11.608 0.279 3 9/16"-18 14.252 14.031 0.221 12.751 13.081 0.330 4 3/4"-16 19.012 18.773 0.239 17.323 17.678 0.356 5 7/8"-14 22.184 21.923 0.262 20.269 20.676 0.406 6 11/16-12 26.944 26.655 0.290 24.689 25.146 0.457 7 15/16-12 33.294 33.005 0.290 31.039 31.496 0.457 8 15/8-12 41.229 40.940 0.290 38.989 39.446 0.457 9 17/8-12 47.579 47.290 0.290 45.339 45.796 0.457 10 21/2-12 63.452 63.162 0.290 61.214 61.671 0.457 公制细牙 6g 外螺纹大径 6H 内螺纹小径内螺纹小径1 M10*1 9.974 9.794 0.180 8.917 9.157 0.240 2 M12*1.5 11.968 11.732 0.236 10.376 10.676 0.300 3 M14*1.5 13.968 13.732 0.236 12.376 12.676 0.300 4 M16*1.5 15.968 15.732 0.236 14.376 14.676 0.300 5 M18*1.5 17.968 17.732 0.236 16.376 16.676 0.300 6 M20*1.5 19.968 19.732 0.236 18.376 18.676 0.300 7 M22*1.5 21.968 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 25.676 0.300 11 M30*1.5 29.968 29.732 0.236 28.376 28.676 0.300 12 M27*2 26.962 26.682 0.280 24.835 25.210 0.375 13 M30*2 29.962 29.682 0.280 27.835 28.210 0.375 14 M33*2 32.962 32.682 0.280 30.835 31.210 0.375 15 M36*2 35.962 35.682 0.280 33.835 34.210 0.375 16 M42*2 41.962 41.682 0.280 39.835 40.210 0.375 英制管螺纹英制管螺纹1 G1/8-28 9.728 9.514 0.214 8.566 8.848 0.282 2 G1/4-19 13.157 12.907 0.250 11.445 11.890 0.445 3 G3/8-19 16.662 16.412 0.250 14.950 15.395 0.445 4 G1/2-14 20.955 20.671 0.284 18.631 19.172 0.541 5 G3/4-14 26.441 26.157 0.284 24.117 24.658 0.541 6 G1-11 33.249 32.889 0.360 30.291 30.931 0.640 7 G11/4-11 41.910 41.550 0.360 38.952 39.592 0.640 8 G11/2-11 47.803 47.443 0.360 44.845 45.485 0.640 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 外螺纹外螺纹内螺纹 -4 9/16"-199/16"-19牙 14.28 14.28 13.0813.08-6 11/16''-16 11/16''-16 17.46 17.46 16.116.1-8 13/16''-16 13/16''-16 20.64 20.64 19.2819.28 -10 1''-14 1''-14 25.40 25.40 23.5723.57-12 1(3/16)''-12 1(3/16)''-12 30.00 30.00 28.3228.32-16 1(7/16)''-12 1(7/16)''-12 36.51 36.51 34.6734.67-20 1(11/16)''-12 1(11/16)''-12 42.86 42.86 41.0241.02C 型JIC37度美制UNF 螺纹常用规格 -4 7/16”-20 7/16”-20 11.11 11.11 10.0310.03 -5 1/2”-20 1/2”-20 12.70 12.70 11.32 11.32-6 9/16”-18 9/16”-18 14.28 14.28 13.0813.08-8 3/4”-16 3/4”-16 19.00 19.00 17.6817.68-10 7/8”-14 7/8”-14 22.22 22.22 20.6820.68-12 1(1/16)"-12 1(1/16)"-12 26.98 26.98 25.1525.15-16 1(5/16)"-12 1(5/16)"-12 33.33 33.33 31.531.5-20 1(5/8)"-12 1(5/8)"-12 41.28 41.28 39.4439.44 -24 1(7/8)"-12 1(7/8)"-12 47.62 47.62 45.845.8-32 2(1/2)"-12 2(1/2)"-12 63.5 63.5 61.67英制圆柱管螺纹（BSPP ）常用规格 -4 1/4”-19 1/4”-19 13.157 13.157 11.55-6 3/8”-19 3/8”-19 16.662 16.662 14.9514.95-8 1/2”-14 1/2”-14 20.955 20.955 18.6318.63 -12 3/4”-14 3/4”-14 26.441 26.441 24.11-16 1”-11 1”-11 33.249 33.249 30.29-20 1(1/4)''-11 1(1/4)''-11 41.91 41.91 38.9538.95英制圆锥管螺纹（BSPT ）常用规格 基面大径基面大径基准距离1/4”-19 1/4”-19 13.157 13.157 663/8”-19 3/8”-19 16.662 16.662 6.46.41/2”-14 1/2”-14 20.955 20.955 8.28.23/4”-14 3/4”-14 26.441 26.441 9.59.51”-11 1”-11 33.249 33.249 10.410.41(1/4)''-11 1(1/4)''-11 41.91 41.91 12.712.7美制圆锥管螺纹（NPT ）1/8”-27 1/8”-27 10.24 10.24 441/4”-18 1/4”-18 13.60 13.60 443/8”-18 3/8”-18 17.04 17.04 4.324.321/2”-14 1/2”-14 21.22 21.22 4.484.483/4”-14 3/4”-14 26.57 26.57 4.754.751”-11(1/2)” 1”-11(1/2)” 33.22 33.22 4.64.61(1/4)”-11.5 1(1/4)”-11.5 41.96 41.96 4.834.83。
英制螺纹尺寸规格对照表
101.6 5.645 4 1/2 97.985 94.37
107.95 6.35
4
103.886 99.822
牙型高 底孔直径
H1
mm
0.508 0.581 0.625 0.625 0.739 0.813 0.904 1.017 1.017 1.162 1.162 1.355 1.355 1.479 1.627 1.807 1.807 2.033 2.033 2.033 2.324 2.324 2.711 2.711 2.711 3.253 3.253 3.614 3.614 3.614 4.066
31.75 2.822
9
29.944 28.138
34.925 3.175
8
32.893 30.861
38.1
3.175
8
36.068 34.036
41.275 3.175
8
39.243 37.211
44.45 3.629
7
42.126 39.802
50.8
3.629
7
48.476 46.152
57.15 4.234
0.125 0.125 0.184 0.184 0.249 0.249 0.317 0.317 0.317 0.317 0.317 0.317 0.317 0.317 0.317
6.4 8.4 11.2 14.75 18.25 23.75 30 38.5 44.5 56 71 85.5 110.5 136 161.5
英制普通螺纹 (惠氏螺纹) -- 细牙 (BSW)
大径
螺距
每英寸牙 数
中径
小径
mm
mm
tpi
mm
英制管螺纹内径外径对照表
英制管螺纹内径外径对照表尺寸代号每寸牙数大径中径小径建议底孔基准距离牙数1/8 27 10.242 9.489 8.736 φ8.6 4.102 4.361/4 18 13.616 12.487 11.358 φ11.1 5.786 4.103/8 18 17.055 15.926 14.797 φ14.5 6.096 4.321/2 14 21.223 19.772 18.321 φ17.9 8.128 4.483/4 14 26.568 25.117 23.666 φ23.28.611 4.751 11.5 33.228 31.461 29.694 φ29.2 10.160 4.601-1/4 11.5 41.985 40.218 38.451 φ37.9 10.668 4.831-1/2 11.5 48.054 46.287 44.520 φ43.9 10.668 4.83常用螺纹规范对照表符号螺纹种类规范牙型角M 公制粗牙 ISO 261 60°S 细小螺丝 ISO R1501 60°UNC 统一牙粗牙 ISO 263 60° UNF 统一牙细牙 ISO 263 60° UNEF 统一牙特细牙 ISO 263 60° UN 统一牙固定牙 ISO 263 60° UNS 统一牙特殊牙 ----- 60°NC 美制牙粗牙 ANSI B1.1 60° NF 美制牙细牙 ANSI B1.1 60° NEF 美制牙特细牙 ANSI B1.1 60° N 美制牙固定牙 ANSI B1.1 60° NS 美制牙特殊牙 ANSI B1.1 60°BSW 英制牙粗牙 BS 84 55°BSF 英制牙细牙 BS 84 55°BC 自行车牙 JIS B0225 60°SM 针车用 JIS B0226 60°CTV 自行行车用风嘴 JIS D9422 60°TV 汽车用风嘴 JID D4207 60°BSC 英制自行车 BS 811 60°BA 英制小螺丝 BS 93 30°47°Tr 公制爱克母牙 ISO 2902 30°TW 爱克姆牙 JIS B0222 29°ACME 爱克姆牙 ANSI B1.5 29°STUB-ACME 浅牙爱克姆 ANSI B1.8 29° C 平行管用螺纹 ISO 228/1 55°BSPF 英制平行管螺纹 BS 2779 55°PF 英制平行管螺纹 IS B0202 55°R 管用推拔管用 ISO 7/1 55°1/16Rc 管用推拔内螺纹 ISO 7/1 55°1/16Rp 管用平行内螺纹 ISO 7/1 55°PT 推拔管用 JIS B0203 55°1/16PS 平行内螺纹 JIS B0203 55°BSP 英制管牙 BS 21.2779 55°NPT 美制一般推拔管用 ANSI B2.1 60°1/16 NPTR 美制栏杆接头用 ANSI B2.1 60°1/16 NPS 美制一般平行管用 ANSI B2.1 60° NPSM 美制平行管用装配器用 ANSI B2.1 60° NPSL 美制锁紧螺帽用 ANSI B2.1 60°NPSH 美制水管用 ANSI B2.1 60°NPSC 美制管接头用 ANSI B2.1 60°NH 美制消防水管用 ANSI B2.1 60°NPSF 美制干封管用平行内螺纹 ANSI B2.1 60°NPTI 美制干封管用平行 ANSI B2.1 60° NPTF 美制干封管用推拔 ANSI B2.1 60°1/16 NGT 美制瓦斯用推拔 ANSI B57.1 60°1/16 NGS 美制瓦斯用平行 ANSI B57.1 60°NGO 美制瓦斯用出口 ANSI B57.1 60°SGT 美制瓦斯用特殊 ANSI B57.1 60°1/8E 电灯泡用 JIS C7709 圆V 瓦斯桶凡而用 JIS B8245/6 55°3/26C 薄铜电线管用 JIS B0204 80°常用规格（公制）M1.2*0.25 M2.5*0.45 M6*0.75 M10*0.75 M1.4*0.3 M2.6*0.45 M6*1 M10*1M1.6*0.35 M3*0.5 M7*0.75 M10*1.25M1.7*0.25 M3*0.6 M7*1 M10*1.5M1.7*0.35 M3.5*0.6 M8*0.75 M11*1M1.8*0.35 M4*0.5 M8*1 M11*1.5M2*0.4 M4*0.7 M8*1.25 12*1M2.2*0.45 M5*0.5 M9*1 M12*1.25M2.3*0.45 M5*0.8 M9*1.25 M12*1.5常用规格（美制）0-80UNF 5-40UNC 10-32UNF 5/16〃-32UNEF1-64UNC 5-44UNV 12-24UNC 3/8〃-16UNC1-72UNF 6-32UNC 12-28UNF 3/8〃-24UNF2-56UNC 6-40UNF 12-32UNEF 3/8〃-32UNEF2-64UNF 5/32〃-32UNC 1/4〃-20UNC 7/16〃-14UNC 3-48UNC 8-32UNC 1/4〃-28UNF 7/16〃-20UNF3-56UNF 8-36UNF 1/4〃-32UNEF 7/16〃-28UNEF4-40UNC 3/16〃-24UNC 5/16〃-18UNC 1/2〃-13UNC 4-48UNF 10-24UNC 5/16〃-24UNF 1/2〃-20UNF 常用规格（英制）1/8〃-40 1/2〃-12 1〃-8 2〃-4.55/32〃-32 9/16〃-12 1-1/8〃-7 2-1/8〃-43/16〃-24 5/8〃-11 1-1/4〃-7 2-1/4〃-47/32〃-24 11/16〃-11 1-3/8〃-6 2-1/2〃-41/4〃-20 3/4〃-16 1-1/2〃-6 2-3/4〃-45/16〃-18 13/16〃-10 1-5/8〃-5 3-1/4〃-43/8〃-16 7/8〃-9 1-1/4〃-5 3-1/2〃-47/16〃-14 15/16〃-9 1-7/8〃-4.5 3-3/4〃-44〃-4。
公英制螺纹对照表
英制、公制对照表
英寸制统一螺纹，在英寸制国家广泛采用，该类螺纹分三个系列：粗牙系列UNC，细牙系列UNF，特细牙系列UNFF，外加一个定螺距系列UN。
标注方法：螺纹直径—每英寸牙数系列代号—精度等级
示例：粗牙系列 3/8—16 UNC—2A 细牙系列 3/8—24 UNF—2A 特细牙系列 3/8—32 UNFF—2A 定螺距系列 3/8—20 UN—2A 第一位数字3/8表示螺纹外径，单位为英寸，转换为米制单位mm要乘以25.4，即3/8×25.4=9.525mm；第二、三位数字16、24、32、20为每英寸牙数(在25.4mm长度上的牙数)；第三位以后的文字代号UNC、UNF、UNFF、UN为系列代号，最后两位2A为精度等级。
在统一螺纹标准中规定，一个公称尺寸可有不同的螺距，如1/2就有13牙、16牙、20牙、32牙之分，标准规定13牙为粗牙，20牙为细牙，28牙为超细牙；16牙和32牙都称为恒定螺距，和粗牙、细牙没什么不同。
英制螺纹外径公制对照表
螺纹电极外径，螺距参照表。
最全的公制英制螺纹对照表
(單位：mm) 內螺紋小徑
最小直徑
1.425 1.695 1.941 2.157 2.487 2.642 3.302 3.683 4.344 4.979 6.401 7.798 9.144 10.592 11.989 13.386 16.307 19.177 21.971 24.638 27.813 30.353 33.528 38.964 44.679
2.221 2.721 3.221 3.599 4.099 4.599 5.099 5.378 6.378 7.153 7.378 8.153 8.378 8.912 9.153 9.378 10.153 10.378 10.676 10.912 11.153 12.676 13.153 13.676 14.153 14.676 15.153 15.676 16.153 16.210 16.676 17.153 18.210 18.676 19.153 20.210 20.676 21.153 22.210 22.676 23.153 23.210 23.676 24.153
崁合度區分：中(注1)2級(注2) 下孔徑
2.22 (75%) 2.72 (75%) 3.22 (75%) 3.59 (75%) 4.09 (75%) 4.59 (75%) 5.09 (75%) 5.35 (80%) 6.35 (80%) 7.13 (80%) 7.35 (80%) 8.13 (80%) 8.35 (80%) 8.85 (85%) 9.13 (80%) 9.35 (80%) 10.13 (80%) 10.35 (80%) 10.62 (85%) 10.85 (85%) 11.13 (80%) 12.62 (85%) 13.13 (80%) 13.62 (85%) 14.13 (80%) 14.62 (85%) 15.13 (80%) 15.62 (85%) 16.13 (80%) 16.2 (85%) 16.62 (85%) 17.13 (80%) 18.2 (85%) 18.62 (85%) 19.13 (80%) 20.2 (85%) 20.62 (85%) 21.13 (80%) 22.2 (85%) 22.62 (85%) 23.13 (80%) 23.2 (85%) 23.62 (85%) 24.13 (80%)
公制和英制螺纹对照表
公制和英制螺纹对照表
公制和英制螺纹是两种常用的螺纹标准。
公制螺纹用螺距表示螺纹的尺寸，而英制螺纹则用每英寸包含的螺纹数量表示尺寸。
以下是公制和英制螺纹之间的转换表，以mm（毫米）为单位：
1. 公制螺纹尺寸转换为英制螺纹尺寸：
- M = 0.63659 inches = 1.27 inches (公制螺纹)
- NPT = 0.30642 inches = 1 inches (英制螺纹)
- PT = 0.23624 inches = 1/4 inches (英制螺纹)
- NPSC = 0.29371 inches = 3/8 inches (英制管螺纹)
2. 英制螺纹尺寸转换为公制螺纹尺寸：
- 0.3048 inches = 0.64676 inches (英制螺纹)
- NPT = 3.14 * 0.3048 = 1.1304 mm (公制螺纹)
- NPSC = 3.14 * 0.29371 = 0.9919 mm (公制螺纹)
- PT = 3.14 * 0.23624 = 0.6096 mm (公制螺纹)
注意：上述转换表仅供参考，实际应用中可能因螺纹类型、材料等因素而有所不同。
在进行螺纹转换时，请根据实际情况调整。
公英制螺纹对照表
英制、公制对照表英寸制统一螺纹，在英寸制国家广泛采用，该类螺纹分三个系列：粗牙系列UNC 细牙系列UNF特细牙系列UNFF外加一个定螺距系列UN 标注方法：螺纹直径一每英寸牙数系列代号一精度等级示例：粗牙系列3/8 —16 UNC-2A 细牙系列3/8 —24 UNF-2A 特细牙系列3/8 —32 UNFF-2A 定螺距系列3/8 —20 UN-2A 第一位数字3/8表示螺纹外径，单位为英寸，转换为米制单位mm要乘以25.4，即3/8 X 25.4=9.525mm第二、三位数字16、24、32、20为每英寸牙数（在25.4mm长度上的牙数）；第三位以后的文字代号UNC UNF UNFF UN为系列代号，最后两位2A为精度等级。
在统一螺纹标准中规定，一个公称尺寸可有不同的螺距，如1/2就有13牙、16牙、20牙、32牙之分，标准规定13牙为粗牙，20牙为细牙，28牙为超细牙；16牙和32牙都称为恒定螺距，与粗牙、细牙没什么不同。
英制螺纹外径公制对照表英制11公制4# 2. 95# 3. 26# 3. 57# 3. 98# 4. 210# 4. 812# 5. 514#/1/4 6. 35 1/8 3. 175 1/4 6. 35 5/16 7. 936 3/8 9. 525 7/16 11. 113 1/2 12. 7 9/16 14. 288 5/8 15. 875 3/4 19. 05 7/8 22. 2251 25. 4 1-1/8 28. 575 1-1/4 31. 75 英制公制1-5/8 41. 2751-3/4 44. 451-7/8 47. 6252 50. 82-1/8 53. 9752-1/4 57. 152-3/8 60. 3252-1/2 63. 52-5/8 66. 6752-3/4 69. 852-7/8 73. 0253 76. 23-1/8 79. 3753-1/4 82. 553-3/8 85. 7253-1/2 88. 93-5/8 92. 0253-3/4 95.253-7/8 98.1254 101.64-1/4 107.95英制公制4-5/8 117.4754-3/4 120.654-7/8 123.8255 1275-1/4 133.355-3/8 136.5255-1/2 139.75-5/8 142.8755-3/4 146.055-7/8 149.2256 152.46-1/4 158.756-3/8 161.9256-1/2 168.2756-5/8 171.456-3/4 174.6256-7/8 177.87 184.157-1/4 187.3257-3/8 190.57-1/2 193.675央美联 关合公制规格底孔①规格底孔①1-64UNC 1.55 M1.0*0.25 0.75 2-56UNC 1.8 M1.1*0.25 0.85 3-48UNC 2.1 M1.2*0.25 0.95 4-40UNC 2.3M1.4*0.3 1.1 5-40UNC 2.6M1.6*0.35 1.25 6-32UNC 2.8 M1.7*0.35 1.35 8-32UNC 3.4 M1.8*0.35 1.45 10-32UNC 4.1 M2.0*0.4 1.6 10-24UNC 3.9 M2.2*0.45 1.75 12-24UNC 4.5 M2.3*0.4 1.9 1\4-20UNC 5.1 M2.5*0.45 2.1 5\16-18u nc 6.6 M2.6*0.45 2.2 3\8-16UNC 8 M3.0*0.5 2.5 7\16-14UNC 9.4 M3.0*0.6 2.4 1\2-13UNC 10.8 M3.5*0.6 2.9 9\16-12UNC 12.2 M4.0*0.7 3.3 5\8-11UNC 13.6 M4.0*0.75 3.25 3\4-10UNC 16.5 M4.5*0.7 3.8 7\8-9UNC 19.5 M5*0.8 4.2 1--8UNC 22.2 M5*0.9 4.1 11\8-7UNC 25 M6*1.0 5 11\4-7UNC 28.2 M7*1.0 6 13\8-6UNC 30.8 M8*1.25 6.8 11\2-6UNC 34 M9*1.25 7.8 13\4-5UNC 39.5 M10*1.5 8.5 2-41\2UNC45.2M11*1.5 9.5 英美联合螺纹螺距根据每一 英寸长度上拥有的牙数来计算外径根据螺纹牌号的第一个 代号来计算（4#，5#，6#，7#，8#， 10#- 12#为特殊外径详见表1）M12*1.75 10.3 M14*2.0 12 M16*2.0 14 M18*2.5 15 M20*2.5 17 7 / ▼ .M22*2.519 1/4*25.4=6.35 （螺纹外径）M24*3.0211-3/8 1-1/2I 34. 925 I I 4-3/8 | I 38. 1 II 4-1/2 I 111.125 114.37-5/8 196.85 7-3/4200.025螺纹电极外径，螺距参照表例：1/4-20 UNC1/4*25.4=6.35 （螺纹外径）25.4/20=1.27 （螺距）阴影部为英制和公制粗牙常用螺纹。
英制螺纹尺寸公差表
英制螺纹尺寸公差表单位：毫米规格代号系列代号等级螺距外螺纹内螺纹名义直径每英寸牙数外径中径内径小径中径大径1 0.060—80 （0#—80）UNF2 0.3175 1.5113 –0.08128 1.30556 –0.04572 1.12268 1.1811+0.12446 1.3182 +0.05842 1.5243 0.3175 1.5240 –0.08128 1.3182 –0.03302 1.13538 1.1811 +0.12446 1.3182 +0.04318 1.5242 0.073—64 （1#—64）UNC 2 0.396875 1.83896 –0.09652 1.58242 –0.0508 1.35128 1.42494+0.15748 1.59766 +0.06604 1.8542 3 0.396875 1.8542 –0.09652 1.59766 –0.0381 1.36652 1.42494+0.15748 1.59766 +0.04826 1.85423 0.073—72 （1#—72）UNF 2 0.352777 1.83896 –0.0889 1.61036 –0.04826 1.40716 1.4732 +0.1397 1.6256 +0.0635 1.85423 0.352777 1.8542 –0.0889 1.6256 –0.03556 1.4224 1.4732 +0.1397 1.6256 +0.04826 1.85424 0.086—56 （2#—56）UNC 2 0.453571 2.16916 –0.10414 1.87452 –0.05334 1.6129 1.69418 +0.1778 1.88976 +0.07112 2.18443 0.453571 2.1844 –0.10414 1.88976 –0.04064 1.62814 1.69418 +0.1778 1.88976 +0.05334 2.18445 0.086—64 （2#—64）UNF 2 0.396875 2.16916 –0.09652 1.91262 –0.0508 1.68148 1.75514 +0.15748 1.92786 +0.06858 2.18443 0.396875 2.1844 –0.09652 1.92786 –0.0381 1.69672 1.75514 +0.15748 1.92786 +0.0508 2.18446 0.099—48 （3#—48）UNC 2 0.529166 2.49682 –0.1143 2.15392 –0.05842 1.84658 1.94056 +0.20574 2.1717 +0.07620 2.51463 0.529166 2.5146 –0.1143 2.1717 –0.04318 1.86436 1.94056 +0.20574 2.1717 +0.05588 2.51467 0.099—56 （3#—56）UNF 2 0.453571 2.49682 –0.10414 2.20218 –0.05588 1.94056 2.02438 +0.17272 2.21996 +0.07112 2.51463 0.453571 2.5146 –0.10414 2.21996 –0.04064 1.95834 2.02438 +0.17272 2.21996 +0.05334 2.51468 0.112—40 （4#—40）UNC 2 0.635 2.82448 –0.12954 2.413 –0.0635 2.0447 2.15646 +0.2286 2.43332 +0.08382 2.84483 0.635 2.8448 –0.12954 2.43332 –0.04826 2.06502 2.15646 +0.2286 2.43332 +0.06096 2.84489 0.112—48 （4#—48）UNF 2 0.529166 2.82702 –0.1143 2.48412 –0.06096 2.17678 2.27076 +0.18796 2.5019 +0.07874 2.84483 0.529166 2.8448 –0.1143 2.5019 –0.04572 2.19456 2.27076 +0.18796 2.5019 +0.05842 2.844810 0.125—40 （5#—40）UNC 2 0.635 3.15468 –0.12954 2.7432 –0.06604 2.3749 2.48666 +0.21082 2.76352 +0.08382 3.1753 0.635 3.175 –0.12954 2.76352 –0.04826 2.39522 2.48666 +0.21082 2.76352 +0.0635 3.17511 0.125—44 （5#—44）UNF 2 0.577273 3.15722 –0.12192 2.7813 –0.0635 2.44856 2.55016 +0.1905 2.79908 +0.08128 3.1753 0.577273 3.175 –0.12192 2.79908 –0.04826 2.46634 2.55016 +0.1905 2.79908 +0.06096 3.17512 0.138—32 （6#—32）UNC 2 0.79375 3.48488 –0.1524 2.96926 –0.07112 2.51206 2.6416+0.254 2.98958 +0.09398 3.50523 0.79375 3.5052 –0.1524 2.98958 –0.05334 2.53238 2.6416+0.254 2.98958 +0.06858 3.505213 0.138—40 （6#—40）UNF 2 0.635 3.48488 –0.12954 3.0734 –0.06604 2.7051 2.8194+0.2032 3.09372 +0.08636 3.50523 0.635 3.5052 –0.12954 3.09372 –0.0508 2.72542 2.8194 +0.19304 3.09372 +0.0635 3.5052序号 规格代号系列 代号 等级 螺距 外螺纹 内螺纹 名义直径 每英寸牙数外径 中径 内径 小径 中径 大径 14 0.164—32 （8#—32）UNC 2 0.79375 4.14274 –0.1524 3.62712 –0.07366 3.16992 3.302 +0.2286 3.64998 +0.09652 4.1656 3 0.79375 4.1656 –0.1524 3.64998 –0.05588 3.19278 3.302 +0.22606 3.64998 +0.07112 4.1656 15 0.164—36 （8#—36）UNF 2 0.70555 4.14528 –0.1397 3.68808 –0.07112 3.27914 3.4036 +0.2032 3.7084 +0.09144 4.1656 3 0.70555 4.1656 –0.1397 3.7084 –0.05334 3.29946 3.4036 +0.19304 3.7084 +0.06858 4.1656 16 0.190—24 （10#—24）UNC 2 1.05833 4.8006 –0.18288 4.11226 –0.08382 3.50266 3.683 +0.2794 4.13766 +0.10922 4.826 3 1.05833 4.826 –0.18288 4.13766 –0.0635 3.52806 3.683 +0.2667 4.13766 +0.08128 4.826 17 0.190—32（10#—32）UNF 2 0.79375 4.80314 –0.1524 4.28752 –0.0762 3.83032 3.9624 +0.20324.31038 +0.09906 4.826 3 0.79375 4.826 –0.1524 4.31038 –0.05842 3.85318 3.9624 +0.205744.31038 +0.07366 4.826 18 0.216—24 UNC 2 1.058335.461 –0.18288 4.77266 –0.08636 4.16306 4.3434 +0.2544.79806 +0.111765.4864 3 1.05833 5.4864 –0.18288 4.79806 –0.06604 4.18846 4.3434 +0.246384.79806 +0.83825.4864 19 0.216—28 UNF 2 0.90714 5.461 –0.1651 4.87172 –0.08128 4.34848 4.4958 +0.22864.89712 +0.106685.4864 3 0.90714 5.4864 –0.1651 4.89712 –0.06096 4.37388 4.4958 +0.220984.89712 +0.078745.4864 20 0.216—32 UNEF 2 0.79375 5.46354 –0.1524 4.94792 –0.07874 4.49072 4.6228 +0.20324.97078 +0.104145.4864 3 0.79375 5.4864 –0.1524 4.97078 –0.06096 4.51358 4.6228 +0.19054.97078 +0.078745.4864 21 0.250—20 1/4—20 UNC 1 1.276.32206 –0.30988 5.49656 –0.14224 4.76504 4.9784 +0.27945.5245 +0.185426.35 2 1.27 6.32206 –0.20574 5.49656 –0.09398 4.76504 4.9784 +0.27945.5245 +0.124466.35 3 1.27 6.35 –0.20574 5.5245 –0.07112 4.79298 4.9784 +0.271785.5245 +0.091446.35 22 0.250—28 1/4—28UNF 1 0.90714 6.3246 –0.24892 5.73532 –0.127 5.21208 5.3594 +0.22865.76072 +0.16516.35 2 0.90714 6.3246 –0.1651 5.73532 –0.08382 5.21208 5.3594 +0.22865.76072 +0.109226.35 3 0.90714 6.35 –0.1651 5.76072 –0.0635 5.23748 5.3594 +0.20325.76072 +0.081286.35 23 0.250—32 1/4—32UNEF 2 0.79375 6.3246 –0.1524 5.80898 –0.8128 5.35178 5.4864 +0.20325.83438 +0.106686.35 3 0.79375 6.35 –0.1524 5.83438 –0.6096 5.37718 5.4864 +0.175265.83438 +0.078746.35 24 .3125－18 5/16－18UNC 1 1.411117.90702 –0.33274 6.99008 –0.15494 6.17474 6.4008 +0.33027.02056 +0.200667.9375 2 1.411117.90702 –0.22098 6.99008 –0.1016 6.17474 6.4008 +0.33027.02056 +0.134627.9375 3 1.411117.9375 –0.220987.02056 –0.0762 6.20522 6.4008 +0.27947.02056 +0.099067.9375序号 规格代号系列 代号 等级 螺距 外螺纹 内螺纹 名义直径 每英寸牙数外径 中径 内径 小径 中径 大径 25 .3125—20 5/16—20UN 21.27 7.90702 –0.205747.08152 –0.1016 6.35 6.5532 +0.30487.112 +0.132087.9375 31.27 7.9375 –0.205747.112 –0.0762 6.38048 6.5532 +0.2547.112 +0.099067.9375 26 .3125—24 5/16—24UNF 11.0583337.90956 –0.274327.22122 –0.1397 6.61162 6.7818 +0.2547.24916 +0.180347.9375 21.0583337.90956 –0.182887.22122 –0.09398 6.61162 6.7818 +0.2547.24916 +0.121927.9375 31.0583337.9375 –0.182887.24916 –0.6858 6.63956 6.7818 +0.21336 7.24916 +0.091447.9375 27 .3125—28 5/16—28UN 20.90714 7.9121 –0.16517.32282 –0.8636 6.79958 6.9596 +0.20327.34822 +0.111767.9375 30.90714 7.9375 –0.16517.34822 –0.06604 6.82498 6.9596 +0.17018 7.34822 +0.083827.9375 28 .3125—32 5/16—32UNEF 20.79375 7.9121 –0.15247.39648 –0.08128 6.93928 7.0866 +0.17787.42188 +0.106687.9375 30.79375 7.9375 –0.15247.42188 –0.06096 6.96468 7.0866 +0.14478 7.42188 +0.78747.9375 29 0.375—16 3/8—16 UNC 11.5875 9.49198 –0.360688.46074 –0.1651 7.5438 7.7978 +0.35568.49376 +0.21599.525 21.5875 9.49198 –0.238768.46074 –0.11176 7.5438 7.7978 +0.35568.49376 +0.144789.525 31.5875 9.525 –0.238768.49376 –0.08382 7.57682 7.7978 +0.28448 8.49376 +0.109229.525 30 0.375—20 3/8—20UN 21.27 9.49452 –0.205748.66902 –0.10414 7.9375 8.1534 +0.27948.6995 +0.137169.525 31.27 9.525 –0.205748.6995 –0.07874 7.96798 8.1534 +0.22098 8.6995 +0.10169.525 31 0.375—24 3/8—24UNF 11.0583339.49706 –0.274328.80872 –0.14478 8.19912 8.382 +0.2548.83666 +0.18796 9.525 21.0583339.49706 –0.182888.80872 –0.09652 8.19912 8.382 +0.2548.83666 +0.12466 9.525 31.0583339.525 –0.182888.83666 –0.07366 8.22706 8.382 +0.182888.83666 +0.09398 9.525 32 0.375—28 3/8—28UN 20.90714 9.49706 –0.16518.90778 –0.09144 8.38454 8.5344 +0.22868.93572 +0.116849.525 30.90714 9.525 –0.16518.93572 –0.06858 8.41248 8.5344 +0.16764 8.93572 +0.08899.525 33 0.375—32 3/8—32UNEF 20.79375 9.4996 –0.15248.98398 –0.08636 8.52678 8.6614 +0.20329.00938 +0.111769.525 30.79375 9.525 –0.15249.00938 –0.0635 8.55218 8.6614 +0.14986 9.00938 +0.083829.525 34 0.4375—14 UNC 11.81428611.07694 –0.39379.89838 –0.18034 8.8519 9.144 +0.40649.93394 +0.2336811.1125 2 1.81428611.07694 –0.261629.89838 –0.11938 8.8519 9.144 +0.40649.93394 +0.1549411.1125 3 1.81428611.1125 –0.261629.93394 –0.0889 8.88746 9.144 +0.297189.93394 +0.1168411.1125 35 0.4375—16 UN 2 1.5875 11.07694 –0.2387610.0457 –0.11684 9.12876 9.398 +0.355610.08126 +0.1498611.1125 3 1.5875 11.1125 –0.2387610.08126 –0.08636 9.16432 9.398 +0.25410.08126 +0.114311.1125号 代号 级名义直径 每英寸牙数 外径 中径 内径 小径 中径 大径 36 0.4375—20 UNF 11.27 11.07948 –0.3098810.25398 –0.160029.52246 9.7282 +0.304810.287 +0.2057411.1125 2 1.27 11.07948 –0.2057410.25398 –0.106689.52246 9.7282 +0.304810.287 +0.1371611.1125 3 1.27 11.1125 –0.2057410.287 –0.078749.55548 9.7282 +0.21844 10.287 +0.1041411.1125 37 0.4375—28 UNEF 2 0.90714311.08456 –0.165110.49528 –0.091449.97204 10.1346 +0.203210.52322 +0.1168411.1125 3 0.90714311.1125 –0.165110.52322 –0.068589.99998 10.1346 +0.154910.52322 +0.0889 11.1125 38 0.4375—32 UN 2 0.79375 11.0871 –0.152410.57148 –0.0863610.11248 10.2616 +0.177810.59688 +0.1117611.1125 3 0.79375 11.1125 –0.152410.59688 –0.0635 10.1396810.2616 +0.137210.59688 +0.0838211.1125 39 0.500—13 UNC 1 1.95384612.6619 –0.4140211.3919 –0.1879610.2641410.5918 +0.431811.43 +0.2463812.7 2 1.95384612.6619 –0.2768611.3919 –0.12710.2641410.5918 +0.431811.43 +0.165112.7 3 1.95384612.700 –0.2768611.43 –0.0939810.3022410.5918 +0.289611.43 +0.1219212.7 40 0.500—16 UN 2 1.5875 12.66444 –0.2387611.6332 –0.1193810.7162610.9728 +0.355611.66876 +0.1549412.7 3 1.5875 12.700 –0.2387611.66876 –0.088910.7518210.9728 +0.251511.66876 +0.1168412.7 41 0.500—20 UNF 1 1.27 12.66698 –0.3098811.84148 –0.1625611.10996 11.3284 +0.431811.8745 +0.2133612.7 2 1.27 12.66698 –0.2057411.84148 –0.1092211.10996 11.3284 +0.431811.8745 +0.1422412.7 3 1.27 12.700 –0.2057411.8745 –0.0812811.14298 11.3284 +0.195611.8745 +0.1066812.7 42 0.500—28 UNEF 2 0.90714312.67206 –0.165112.08278 –0.0939811.55954 11.7094 +0.228612.11072 +0.1219212.7 3 0.90714312.700 –0.165112.11072 –0.0711211.58748 11.7094 +0.167612.11072 +0.0914412.7 43 0.500—32 UN 2 0.79375 12.6746 –0.152412.15898 –0.0889 11.70178 11.8364 +0.203212.18438 +0.114312.7 3 0.79375 12.700 –0.152412.18438 –0.0660411.72718 11.8364 +0.149812.18438 +0.0863612.7 44 0.5625—12 UNC 1 2.11666714.24686 –0.4368812.87272 –0.1981211.65098 11.9888 +0.457212.91336 +0.2590814.2875 2 2.11666714.24686 –0.2895612.87272 –0.1320811.65098 11.9888 +0.457212.91336 +0.1727214.2875 3 2.11666714.2875 –0.2895612.91336 –0.0990611.70178 11.9888 +0.312412.91336 +0.1295414.2875 45 0.5625—16 UN 2 1.5875 14.25194 –0.2387613.2207 –0.1193812.3037612.573 +0.355613.25626 +0.1549414.2875 3 1.5875 14.2875 –0.2387613.25626 –0.0889 12.3393212.573 +0.228613.25626 +0.1168414.2875号 代号 级名义直径 每英寸牙数 外径 中径 内径 小径 中径 大径 46 0.5625—18 UNF 11.41111 14.25194 –0.3327413.335 –0.17272 12.5196612.7508 +0.330213.37056 +0.2260614.2875 2 1.41111 14.25194 –0.2209813.335 –0.1143 12.5196612.7508 +0.330213.37056 +0.1498614.2875 3 1.41111 14.2875 –0.2209813.37056 –0.8636 12.5552212.7508 +0.218413.37056 +0.1117614.2875 47 0.5625—20 UN 2 1.27 14.25448 –0.2057413.42898 –0.10668 12.6974612.9032 +0.304813.462 +0.139714.2875 3 1.27 14.2875 –0.2057413.462 –0.08128 12.7304812.9032 +0.208313.462 +0.1041414.2875 48 0.5625—24 UNEF 2 1.05833 14.25702 –0.1828813.56868 –0.09906 12.9590813.1318 +0.25413.59916 +0.1295414.2875 3 1.05833 1402875 –0.1828813.59916 –0.07366 12.9895613.1318 +0.187913.59916 +0.0965214.2875 49 0.5625—28 UN 2 0.90714 14.25956 –0.165113.67028 –0.09398 13.1470413.3096 +0.203213.69822 +0.1168414.2875 3 0.90714 14.2875 –0.165113.69822 –0.07112 13.1749813.3096 +0.154913.69822 +0.0914414.2875 50 0.5625—32 UN 2 0.79375 14.2621 –0.152413.74648 –0.0889 13.2892813.4366 +0.177813.77188 +0.114314.2875 3 0.79375 14.2875 –0.152413.77188 –0.06604 13.3146813.4366 +0.137213.77188 +0.0863614.2875 51 0.625—11 UNC 1 2.30909 15.83436 –0.4622814.33576 –0.21082 13.0022613.3858 +0.482614.3764 +0.2717815.875 2 2.30909 15.83436 –0.3073414.33576 –0.1397 13.0022613.3858 +0.482614.3764 +0.1828815.875 3 2.30909 15.875 –0.3073414.3764 –0.10414 13.0429 13.3858 +0.307314.3764 +0.1371615.875 52 0.625—12 UN 2 2.11666715.83436 –0.2895614.46022 –0.13716 12.9844813.589 +0.457214.50086 +0.1803415.875 3 2.11666715.875 –0.2895614.50086 –0.10414 13.2791213.589 +0.2870214.50086 +0.1346215.875 53 0.625—16 UN 2 1.5875 15.83944 –0.2387614.8082 –0.12192 13.8912614.1478 +0.355614.84376 +0.1574815.875 3 1.5875 15.875 –0.2387614.84376 –0.09144 13.9268214.1478 +0.233714.84376 +0.1168415.875 54 0.625—18 UNF 1 1.41111115.83944 –0.3327414.9225 –0.1778 14.1071614.351 +0.330214.95806 +0.2311415.875 2 1.41111115.83944 –0.2209814.9225 –0.11938 14.1071614.351 +0.330214.95806 +0.152415.875 3 1.41111115.875 –0.2209814.95806 –0.0889 14.1427214.351 +0.203214.95806 +0.114315.875 55 0.625—20 UN 2 1.27 15.84198 –0.2057415.01648 –0.10922 14.2849614.5034 +0.279415.0495 +0.1422415.875 3 1.27 15.875 –0.2057415.0495 –0.08128 14.3179814.5034 +0.195615.0495 +0.1066815.875 56 0.625—24 UNEF 2 1.05833 15.84452 –0.1828815.15618 –0.1016 14.5465814.732 +0.25415.18666 +0.1320815.875 3 1.05833 15.875 –0.1828815.18666 –0.0762 14.5770614.732 +0.1752615.18666 +0.0990615.875序号 规格代号系列 代号 等级 螺距 外螺纹内螺纹 名义直径 每英寸牙数 外径中径 内径 小径 中径 大径 57 0.625—28 UN 2 0.90714315.84706 –0.165115.25778 –0.09652 14.7345414.8844 +0.228615.28572 +0.1244615.875 3 0.90714315.875 –0.165115.28572 –0.0711214.7624814.8844 +0.167615.28572 +0.0939815.875 58 0.625—32 UN 2 0.79375 15.84706 –0.152415.33144 –0.0914414.8742415.0114 +0.203215.35938 +0.1168415.875 3 0.79375 15.875 –0.152415.35938 –0.0685814.9021815.0114 +0.149915.35938 +0.088915.875 59 0.6875—12 UN 2 2.11667 17.42186 –0.2895616.04772 –0.1371614.8259815.1638 +0.457216.08836 +0.1803417.4625 3 2.11667 17.4625 –0.2895616.08836 –0.1041414.8666215.1638 +0.292116.08836 +0.1346217.4625 60 0.6875—16 UN 2 1.5875 17.42694 –0.2387616.3957 –0.12192 15.4787615.748 +0.355616.43126 +0.1574817.4625 3 1.5875 17.4625 –0.2387616.43126 –0.0914415.5143215.748 +0.21336 16.43126 +0.1168417.4625 61 0.6875—20 UN 2 1.27 17.42948 –0.2057416.60398 –0.1092 15.8724616.0782 +0.304816.637 +0.1422417.4625 3 1.27 17.4625 –0.2057416.637 –0.08128 15.9054816.0782 +0.208316.637 +0.1066817.4625 62 0.6875—24 UNEF 2 1.05833317.43202 –0.1828816.74368 –0.1016 16.1340816.3068 +0.25416.77416 +0.1320817.4625 3 1.05833317.4625 –0.1828816.77416 –0.0762 16.1645616.3068 +0.188016.77416 +0.0990617.4625 63 0.6875—28 UN 2 0.90714317.43456 –0.165116.84528 –0.09652 16.3220416.4846 +0.203216.87322 +0.1246617.4625 3 0.90714317.4625 –0.165116.87322 –0.07112 16.3499816.4846 +0.154916.87322 +0.0939817.4625 64 0.6875—32 UN 2 0.79375 17.43456 –0.152416.91894 –0.09144 16.4617416.6116 +0.177816.94688 +0.1168417.4625 3 0.79375 17.4625 –0.152416.94688 –0.06858 16.4896816.6116 +0.137216.94688 +0.088917.4625 65 0.750—10 UNC 1 2.54 19.00428 –0.4927617.35328 –0.22352 15.8877 16.3068 +0.533417.399 +0.292119.05 2 2.54 19.00428 –0.3276617.35328 –0.14986 15.8877 16.3068 +0.533417.399 +0.1955819.05 3 2.54 19.05 –0.3276617.399 –0.11176 15.9334216.3068 +0.317517.399 +0.1447819.05 66 0.750—12 UN 2 2.11666719.00682 –0.2895617.63268 –0.1397 16.4109416.764 +0.457217.67586 +0.1828819.05 3 2.11666719.05 –0.2895617.67586 –0.10414 16.4541216.764 +0.27178 17.67586 +0.1371619.05 67 0.750—16 UNF 1 1.5875 19.0119 –0.3606817.98066 –0.1905 17.0637217.3228 +0.355618.01876 +0.2489219.05 2 1.5875 19.0119 –0.2387617.98066 –0.127 17.0637217.3228 +0.355618.01876 +0.165119.05 3 1.5875 19.05 –0.2387618.01876 –0.09652 17.1018217.3228 +0.223518.01876 +0.1244619.05 68 0.750—20 UNEF 2 1.27 19.01698 –0.2057418.19148 –0.11176 17.4599617.6784 +0.279418.2245 +0.1447819.05 3 1.27 19.05 –0.2057418.2245 –0.08382 17.4929817.6784 +0.195618.2245 +0.1092219.05序号 规格代号系列 代号 等级 螺距 外螺纹内螺纹 名义直径 每英寸牙数 外径中径 内径 小径 中径 大径 69 0.750—28 UN 2 0.90714319.0195 –0.165118.43024 –0.09652 17.907 18.0594 +0.228618.46072 +0.127 19.05 3 0.90714319.05 –0.165118.46072 –0.0736617.9374818.0594 +0.167618.46072 +0.0939819.05 70 0.750—32 UN 2 0.79375 19.02206 –0.152418.50644 –0.0914418.0492418.1864 +0.203218.53438 +0.1193819.05 3 0.79375 19.05 –0.152418.53438 –0.0685818.0771818.1864 +0.149918.53438 +0.0914419.05 71 0.8125—12 UN 2 2.11666720.59432 –0.2895619.22018 –0.1397 17.9984418.3388 +0.457219.26336 +0.1828820.6375 3 2.11666720.6375 –0.2895619.26336 –0.1041418.0416218.3388 +0.276919.26336 +0.1371620.6375 72 0.8125—16 UN 2 1.5875 20.5994 –0.2387619.56816 –0.1244618.6512218.923 +0.355619.60626 +0.1600220.6375 3 1.5875 20.6375 –0.2387619.60626 –0.0914418.6893218.923 +0.21082 19.60626 +0.1193820.6375 73 0.8125—20 UNEF 2 1.27 20.60448 –0.2057419.77898 –0.1117619.0474619.2532 +0.304819.812 +0.1447820.6375 3 1.27 20.6375 –0.2057419.812 –0.8382 19.0804819.2532 +0.208319.812 +0.1092220.6375 74 0.8125—28 UN 2 0.90714320.607 –0.165120.01774 –0.0965219.4945 19.6596 +0.203220.04822 +0.12720.6375 3 0.90714320.6375 –0.165120.04822 –0.0736619.5249819.6596 +0.154920.04822 +0.0939820.6375 75 0.8125—32 UN 2 0.79375 20.60956 –0.152420.09394 –0.0914419.6367419.7866 +0.177820.12188 +0.1193820.6375 3 0.79375 20.6375 –0.152420.12188 –0.0685819.6646819.7866 +0.137220.12188 +0.0914420.6375 76 0.875—9 UNC 1 2.82222222.17674 –0.5283220.34286 –0.2413 18.7147219.177 +0.5842 20.39112 +0.3124222.225 2 2.82222222.17674 –0.3530620.34286 –0.1600218.7147219.177 +0.5842 20.39112 +0.2082822.225 3 2.82222222.225 –0.3530620.39112 –0.1193818.7629819.177 +0.33274 20.39112 +0.1549422.225 77 0.875—12 UN 2 2.11666722.18182 –0.2895620.80768 –0.1397 19.5859419.939 +0.457220.85086 +0.1828822.225 3 2.11666722.225 –0.2895620.85086 –0.10414 19.6291219.939 +0.2590820.85086 +0.1371622.225 78 0.875—14 UNF 1 1.81428622.18436 –0.393721.0058 –0.20574 19.9593220.2692 +0.406421.04644 +0.2692422.225 2 1.81428622.18436 –0.2616221.0058 –0.13716 19.9593220.2692 +0.406421.04644 +0.177822.225 3 1.81428622.225 –0.2616221.04644 –0.10414 19.9999620.2692 +0.223521.04644 +0.1346222.225 79 0.875—16 UN 2 1.5875 22.1869 –0.2387621.15566 –0.12446 20.2387220.4978 +0.355621.19376 +0.1600222.225 3 1.5875 22.225 –0.2387621.19376 –0.09144 20.2768220.4978 +0.223521.19376 +0.1193822.225 80 0.875—20 UNEF 2 1.27 22.19198 –0.2057421.36648 –0.11176 20.6349620.8534 +0.279421.3995 +0.1447822.225 3 1.27 22.225 –0.2057421.3995 –0.08382 20.6679820.8534 +0.195621.3995 +0.1092222.225。
英制螺纹标准对照表
英制,公制螺纹对照表.尺寸代号每英寸牙数螺距螺纹直径（in) n p 大径D、d 小径D1、d1 1/16 28 0.907 7.723 6.5611/8 28 0.907 9.728 8.5661/4 19 1.337 13.157 11.4453/8 19 1.337 16.662 14.951/2 14 1.814 20.955 18.6315/8 14 1.814 22.911 20.5873/4 14 1.814 26.441 24.1177/8 14 1.814 30.201 27.8771 11 2.309 33.249 30.2911-1/8 11 2.309 37.897 34.9391-1/4 11 2.309 41.91 38.9521-1/2 11 2.309 47.803 44.8451-3/4 11 2.309 53.746 50.7882 11 2.309 59.614 56.6562-1/4 11 2.309 65.71 62.7522-1/2 11 2.309 75.184 72.2262-3/4 11 2.309 81.534 78.5783 11 2.309 87.884 84.9263-1/2 11 2.309 100.33 97.3724 11 2.309 113.03 110.0725 11 2.309 138.43 135.4726 11 2.309 163.83 160.872 注：1in=25.4mm1、用螺纹密封的管螺纹其标记及各种螺纹的特征代号规定如下：Rc—圆锥内螺纹55度Rp—与圆锥外螺纹配合的圆柱内螺纹R—圆锥外螺纹标准规定将螺纹尺寸代号写在特征代号之后，若螺纹为械旋应再加写左旋代号LH，具体示例如下：圆锥内螺纹：Rc1/2左旋圆柱内螺纹：Rp1/2—LH圆柱内螺纹与圆锥外螺纹的配合：Rp2/R2左旋B级外螺纹：G1/2B—LH螺纹副G1/2G1/2A内螺纹：G1/2英制螺纹标准JIS B 0203,JIS B 2301(mm)#0 1.52#1 1.85#2 2.18#3 2.51#4 2.84#5 3.18#6 3.51#7 3.84#8 4.17#10 4.83#12 5.481/4 6.35UNS 是英制普通粗牙螺纹; UNF 是英制航空标示皆将分母为8, 再直接称分子之番号.Ex: 1/8 x 0.50 –PPB: 1 分牙螺丝x 0.50”长, PPBEx: 5/16 x 0.50 –PPB = 2.5/8 x 0.50-PPB : 2 分半牙螺丝x 0. 50”长, PPBEx: 5/32 x 0.50 –PPB =1.25/8 x 0.50-PPB: 1 分2 厘半螺丝x 0. 50”长, PPBEx: 1/4 x 0.50-PPB= 2/8 x 0.50-PPB: 2 分牙螺丝x 0.50”长, PP B注: 有时会标示粗牙或细牙.UNF: 细牙:电子业较常用.UNC:粗牙: 重机械结构较常用.Ex: 3/8 x 0.50 ,UNF –PPB: 3 分细牙螺丝x 0.50”长, PPB.C-2: Length Code:为英寸标示, 须乘以25.40 换算为mm.用扣规量，与公制牙型吻合是公制螺纹，与英制螺纹吻合是英制螺纹。
公英制螺纹对照表
英制、公制对照表
英寸制统一螺纹，在英寸制国家广泛采用，该类螺纹分三个系列：粗牙系列UNC细牙系列UNF特细牙系列UNFF外加一个定螺距系列UN 标注方法：螺纹直径一每英寸牙数系列代号一精度等级
示例：粗牙系列3/8 —16 UNC—2A 细牙系列3/8 —24 UNF-2A 特细牙系列3/8 —32 UNFF-2A 定螺距系列3/8 —20 UN-2A 第一位数字3/8表示螺纹外径，单位为英寸，转换为米制单位mm要乘以25.4，即3/8 X 25.4=9.525mm第二、三位数字16、24、32、20为每英寸牙数（在25.4mm长度上的牙数）；第三位以后的文字代号UNC UNF UNFF UN为系列代号，最后两位2A为精度等级。
在统一螺纹标准中规定，一个公称尺寸可有不同的螺距，如1/2就有13牙、16牙、20牙、32牙之分，标准规定13牙为粗牙，20牙为细牙，28牙为超细牙；16牙和32牙都称为恒定螺距，与粗牙、细牙没什么不同。
英制螺纹外径公制对照表
螺纹电极外径，螺距参照表
25.4/20=1.27 （螺距）。
英制螺纹标准对照表
英制,公制螺纹对照表.尺寸代号每英寸牙数螺距螺纹直径（in) n p 大径D、d 小径D1、d1 1/16 28 0.907 7.723 6.5611/8 28 0.907 9.728 8.5661/4 19 1.337 13.157 11.4453/8 19 1.337 16.662 14.951/2 14 1.814 20.955 18.6315/8 14 1.814 22.911 20.5873/4 14 1.814 26.441 24.1177/8 14 1.814 30.201 27.8771 11 2.309 33.249 30.2911-1/8 11 2.309 37.897 34.9391-1/4 11 2.309 41.91 38.9521-1/2 11 2.309 47.803 44.8451-3/4 11 2.309 53.746 50.7882 11 2.309 59.614 56.6562-1/4 11 2.309 65.71 62.7522-1/2 11 2.309 75.184 72.2262-3/4 11 2.309 81.534 78.5783 11 2.309 87.884 84.9263-1/2 11 2.309 100.33 97.3724 11 2.309 113.03 110.0725 11 2.309 138.43 135.4726 11 2.309 163.83 160.872 注：1in=25.4mm1、用螺纹密封的管螺纹其标记及各种螺纹的特征代号规定如下：Rc—圆锥内螺纹55度Rp—与圆锥外螺纹配合的圆柱内螺纹R—圆锥外螺纹标准规定将螺纹尺寸代号写在特征代号之后，若螺纹为械旋应再加写左旋代号LH，具体示例如下：圆锥内螺纹：Rc1/2左旋圆柱内螺纹：Rp1/2—LH圆柱内螺纹与圆锥外螺纹的配合：Rp2/R2左旋B级外螺纹：G1/2B—LH螺纹副G1/2G1/2A内螺纹：G1/2英制螺纹标准JIS B 0203,JIS B 2301(mm)#0 1.52#1 1.85#2 2.18#3 2.51#4 2.84#5 3.18#6 3.51#7 3.84#8 4.17#10 4.83#12 5.481/4 6.35UNS 是英制普通粗牙螺纹; UNF 是英制航空标示皆将分母为8, 再直接称分子之番号.Ex: 1/8 x 0.50 –PPB: 1 分牙螺丝x 0.50”长, PPBEx: 5/16 x 0.50 –PPB = 2.5/8 x 0.50-PPB : 2 分半牙螺丝x 0. 50”长, PPBEx: 5/32 x 0.50 –PPB =1.25/8 x 0.50-PPB: 1 分2 厘半螺丝x 0. 50”长, PPBEx: 1/4 x 0.50-PPB= 2/8 x 0.50-PPB: 2 分牙螺丝x 0.50”长, PP B注: 有时会标示粗牙或细牙.UNF: 细牙:电子业较常用.UNC:粗牙: 重机械结构较常用.Ex: 3/8 x 0.50 ,UNF –PPB: 3 分细牙螺丝x 0.50”长, PPB.C-2: Length Code:为英寸标示, 须乘以25.40 换算为mm.用扣规量，与公制牙型吻合是公制螺纹，与英制螺纹吻合是英制螺纹。
螺纹规格表_螺纹标准
螺纹规格表_螺纹标准螺纹规格表_螺纹标准-值得收藏更新时间：2018-05-03螺纹规格表_螺纹大全-做机械和气动元件值得收藏做机械的天天打交道，时间一长国内的国外的，公制的英制的，直的锥的，密封的非密封的，内的外的，55度的60度的。
总之常常被搞乱，用一次从头到尾查一次，我这里也算是归纳总结一下，希望有所帮助，我的做法是常用的打印出来放在桌边，用时随时拿来查看，时间长了就自然记住了。
（一）NPT是一般用途的美国标准锥管螺纹，牙型角为60°PT牙为英制锥螺纹，牙型角为55°，密封中最常用。
英制管螺纹是细牙螺纹，因为粗牙螺纹的牙深大，会严重的降低所切螺纹外径管子的强度。
PF牙是管用平行螺纹。
G 是55度非螺纹密封管螺纹，属惠氏螺纹家族．标记为 G代表圆柱螺纹，G是管螺纹的统称(Guan)，55、60度的划分属于功能性的ZG俗称管锥，即螺纹由一圆锥面加工而成，一般的水管接头都是这样的，老国标标注为Rc公制螺纹用螺距来表示，美英制螺纹用每英寸内的螺纹牙数来表示，这是它们最大的区别，公制螺纹是60度等边牙型，英制螺纹是等腰55度牙型，美制螺纹60度。
公制螺纹用公制单位，美英制螺纹用英制单位。
管螺纹主要用来进行管道的连接，其内外螺纹的配合紧密，有直管与锥管两种。
公称直径是指所连接的管道直径，显然螺纹大径比公称直径大。
1/4，1/2，1/8是英制螺纹的公称直径，单位是英寸。
（二）1、英寸制统一螺纹在英寸制国家广泛采用，该类螺纹分三个系列：粗牙系列UNC，细牙系列UNF，特细牙系列UNFF，外加一个定螺距系列UN。
标注方法：螺纹直径—每英寸牙数系列代号—精度等级示例：粗牙系列 3/8—16UNC—2A细牙系列 3/8—24UNF—2A特细牙系列 3/8—32UNFF—2A定螺距系列 3/8—20UN—2A第一位数字3/8表示螺纹外径，单位为英寸，转换为米制单位mm要乘以25.4，即3/8×25.4=9.525mm；第二、三位数字16、24、32、20为每英寸牙数(在25.4mm长度上的牙数)；第三位以后的文字代号UNC、UNF、UNFF、UN为系列代号，最后两位2A为精度等级。
英、美制紧固件螺纹公称直径与每英寸牙数对照表-UNC_UNF
=>英、美制紧固件螺纹英寸制螺纹包括惠氏螺纹（Whitworth thread）和统一标准螺纹（Unified thread）。
惠氏螺纹是英国英寸制规格紧固件用普通螺纹，其牙型角为55°，习惯用公称直径（单位为英寸inch）及每英寸牙数来表示，尺寸单位采用符号“ ” ”。
例如：1/2”-12BSW表示公称直径为1/2”的粗牙惠氏螺纹。
统一标准螺纹是美国英寸制规格紧固件用普通螺纹，其牙型角为60°，一般用号码（公称直径﹤1/4”）或公称直径的英寸分数（≥1/4”）、每英寸牙数和代号（UNC、UNF）来表示。
例如：1/2”-13UNC表示公称直径为1/2”的粗牙统一标准螺纹。
惠氏螺纹和统一标准螺纹公称直径与每英寸牙数螺纹大径统一标准螺纹ANSI B1.1-182惠氏螺纹BS84-1956inch尺寸代号粗牙UNC细牙UNF尺寸代号粗牙BSW细牙BSF0.06000#800.06251/16600.07301#64720.08602#56640.09383/32480.09903#48560.11204#40480.12505#40441/8400.13806#32400.15635/32320.16408#32360.18753/1624320.190010#24320.216012#24280.21897/3224280.25001/420281/420260.28129/32260.31255/1618245/1618220.37503/81624> 3/816200.43757/1614207/1614180.50001/213201/212160.56259/1612189/1612160.62505/811185/811140.687511/1611140.75003/410163/410120.812513/16120.87507/89147/89111.0000181218101.12501-1/87121-1/8791.25001-1/47121-1/4791.37501-3/86121-3/881.50001-1/26121-1/2681.62501-5/81-5/881.75001-3/451-3/4572.00002 4.52 4.572.25002-1/4 4.52.50002-1/242.75002-3/443.0000343.25003-1/443.50003-1/243.75003-3/444.00004 4备注：各种英、美制螺纹代号说明BA-British AssociationBSW-British Standard WhitworthBSF-British Standard FineBSP-British Standard PipeBSPT-British Standard Pipe TaperedBSC-British Standard CycleUNC-Unified National CourseUNF-Unified National FineUNEF-Unified National Extra FineUNM-Unified National MiniatureNPT-National Pipe Tapered*以上技术资料仅供参考*1/4-28 UNF-1B 这是一个英制螺纹的标注1/4 是螺纹公称直径28 是指每一英寸28个牙，即牙距为1/28英寸，25.4mm/28UN 是螺纹的标准牙型，牙顶角为60度，可参考<ANSI B1.1-1992>UNF 细牙系列1B 是指螺纹等级代码，一般外螺纹的等级分1A,2A,3A，而内螺纹的等级分1B,2B,3B 1/4-28 UNF-1B螺纹的基本尺寸如下：小径0.211--0.220中径0.02268--0.2333大径最小0.250。
螺纹规格-美制、英制、公制对照表
螺纹规格-美制、英制、公制对照表螺纹规格-美制、英制、公制美制细牙UNF 2A 外螺纹大径UNFUN 2B内螺纹小径（UN、UNF）序号规格型号最大最小公差最小最大公差1 7/16"-20 11.079 10.874 0.206 9.728 10.033 0.3052 1/2"-20 12.667 12.461 0.206 11.328 11.608 0.2793 9/16"-18 14.252 14.031 0.221 12.751 13.081 0.3304 3/4"-16 19.012 18.773 0.239 17.323 17.678 0.3565 7/8"-14 22.184 21.923 0.262 20.269 20.676 0.406-12 26.944 26.655 0.290 24.689 25.146 0.4576 11/167 15/-12 33.294 33.005 0.290 31.039 31.496 0.457 168 15/-12 41.229 40.940 0.290 38.989 39.446 0.45789 17/-12 47.579 47.290 0.290 45.339 45.796 0.4578-12 63.452 63.162 0.290 61.214 61.671 0.457 10 21/2公制细牙6g外螺纹大径6H内螺纹小径1 M10*1 9.974 9.794 0.180 8.917 9.157 0.2402 M12*1.5 11.968 11.732 0.236 10.376 10.676 0.3003 M14*1.5 13.968 13.732 0.236 12.376 12.676 0.3004 M16*1.5 15.968 15.732 0.236 14.376 14.676 0.3005 M18*1.5 17.968 17.732 0.236 16.376 16.676 0.3006 M20*1.5 19.968 19.732 0.236 18.376 18.676 0.3007 M22*1.5 21.968 21.732 0.236 20.376 20.676 0.3008 M24*1.5 23.968 23.732 0.236 22.376 22.676 0.3009 M26*1.5 25.968 25.732 0.236 24.376 24.676 0.30010 M27*1.5 26.968 26.732 0.236 25.376 25.676 0.30011 M30*1.5 29.968 29.732 0.236 28.376 28.676 0.30012 M27*2 26.962 26.682 0.280 24.835 25.210 0.37513 M30*2 29.962 29.682 0.280 27.835 28.210 0.37514 M33*2 32.962 32.682 0.280 30.835 31.210 0.37515 M36*2 35.962 35.682 0.280 33.835 34.210 0.37516 M42*2 41.962 41.682 0.280 39.835 40.210 0.375 英制管螺纹1 G1/8-28 9.728 9.514 0.214 8.566 8.848 0.2822 G1/4-19 13.157 12.907 0.250 11.445 11.890 0.4453 G3/8-19 16.662 16.412 0.250 14.950 15.395 0.4454 G1/2-14 20.955 20.671 0.284 18.631 19.172 0.5415 G3/4-14 26.441 26.157 0.284 24.117 24.658 0.5416 G1-11 33.249 32.889 0.360 30.291 30.931 0.6407 G11/-11 41.910 41.550 0.360 38.952 39.592 0.6404-11 47.803 47.443 0.360 44.845 45.485 0.6408 G11/2公制/美制/英制螺纹对照表给大家分享一下 f NpX?,A型美制螺纹（UNF）常用规格-,!3,o iq外螺纹内螺纹UX x^Y2-4 9/16"-19牙14.28 13.08 8-j,M4D*&-6 11/16''-16 17.46 16.1 {lh szc-8 13/16''-16 20.64 19.28 cM iO|N@1-10 1''-14 25.40 23.57 h |t B-12 1(3/16)''-12 30.00 28.32 )Al{84<(}-16 1(7/16)''-12 36.51 34.67 Ys$3}LA{-20 1(11/16)''-12 42.86 41.02 SW7V7S*Qz{Akh02V@C型JIC37度美制UNF螺纹常用规格 (" G'W CLz -4 7/16”-20 11.11 10.03 -e~xb Qr-5 1/2”-20 12.70 11.32-6 9/16”-18 14.28 13.08 NH'YgL6*-8 3/4”-16 19.00 17.68 lxv;6S!J-10 7/8”-14 22.22 20.68 P|J&?KbC-12 1(1/16)"-12 26.98 25.15 Ki; ++-16 1(5/16)"-12 33.33 31.5 ZF!BkZ Uo-20 1(5/8)"-12 41.28 39.44 LX+c Z-24 1(7/8)"-12 47.62 45.8 iDP@c g-32 2(1/2)"-12 63.5 61.67 j/5j@^L\e w;h4y英制圆柱管螺纹（BSPP）常用规格 dApgz U@;-4 1/4”-19 13.157 11.55 |,hu r8BE\-6 3/8”-19 16.662 14.95 @"%@;>W<t< p=""> -8 1/2”-14 20.955 18.63 F)$7 ?')p-12 3/4”-14 26.441 24.11 Q} &f3?-16 1”-11 33.249 30.29 YZ@pwhZ<-20 1(1/4)''-11 41.91 38.95 SmU'a o.\<v{UpdB"]5英制圆锥管螺纹（BSPT）常用规格 b sDck <li< p="">基面大径基准距离 A4<q_07#< p="">1/4”-19 13.157 6}@E K'k3/8”-19 16.662 6.4 .gy5/-.SZ1/2”-14 20.955 8.2 R0?/'gt3/4”-14 26.441 9.5aF4L{'qK1”-11 33.249 10.4Q,Y do1(1/4)''-11 41.91 12.7 i'9m o0bmO@;ir e_^C X "TaT"(1美制圆锥管螺纹（NPT）mJ f1/8”-27 10.24 4 3VYo$g 1/4”-18 13.60 4 L8|v.?J 3/8”-18 17.04 4.32D[-ijs1/2”-14 21.22 4.48"Lx Hg]') 3/4”-14 26.57 4.75 GIry1”-11(1/2)”33.22 4.6 qBc!A~8K4' 1(1/4)”-11.5 41.96 4.83 </q_07#<></li<></t<>。
英制螺纹标准对照表
小径
外螺纹 d3
6.561 8.566 11.445 14.95 18.631 24.117 30.291 38.952 44.845 56.656 72.226 84.926 110.072 135.472 160.872
8
23.368 21.335 2.033
22
7
26.253 23.929 2.324
24.5
2
1 1/4 ＂ 1 3/8 ＂ 1 1/2 ＂ 1 5/8 ＂ 1 3/4 ＂ 1 7/8 ＂
2＂ 2 1/4 ＂ 2 1/2 ＂ 2 3/4 ＂
3＂ 3 1/4 ＂ 3 1/2 ＂ 3 3/4 ＂
4＂ 4 1/4 ＂ 4 1/2 ＂ 4 3/4 ＂
6.4
28
9.147 8.566
0.581 0.125
8.4
19
12.301 11.445 0.856 0.184
11.2
19
15.806 14.95
0.856 0.184 14.75
14
19.793 18.631 1.162 0.249 18.25
14
25.279 24.117 1.162 0.249 23.75
tpi
mm
外螺纹
H1
mm
d2=D2
d3
60
1.315
1.05
0.27
1.15
48
2.041
1.703