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 6.561
1/8 28 0.907 9.728 8.566
1/4 19 1.337 13.157 11.445
3/8 19 1.337 16.662 14.95
1/2 14 1.814 20.955 18.631
5/8 14 1.814 22.911 20.587
3/4 14 1.814 26.441 24.117
7/8 14 1.814 30.201 27.877
1 11 2.309 33.249 30.291
1-1/8 11 2.309 37.897 34.939
1-1/4 11 2.309 41.91 38.952
1-1/2 11 2.309 47.803 44.845
1-3/4 11 2.309 53.746 50.788
2 11 2.309 59.614 56.656
2-1/4 11 2.309 65.71 62.752
2-1/2 11 2.309 75.184 72.226
2-3/4 11 2.309 81.534 78.578
3 11 2.309 87.884 84.926
3-1/2 11 2.309 100.33 97.372
4 11 2.309 113.03 110.072
5 11 2.309 138.43 135.472
6 11 2.309 163.83 160.872
注：1in=25.4mm
1、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
螺纹管件尺寸表
1. 平头外丝（短管）国际通用系列钢管(英制管) Inch Pipe国内沿用系列钢管
(公制管) Metric Pipe
C 三种型式，短管(公制管)仅有 C 型04 不锈钢(英制管),Φ18*2 L100 20 钢(公制管)2. 单头螺纹短节公称通径Nominal Diameter外径Outside Diameter DSch40 STDSch80XSSch160 XXSL
DNNPS
81/413.5○
6090120150180103/817.2○ 151/221.3○○
203/426.7○○
25133.4○○
321.1/442.2○○
401.1/248.3○○
50260.3○○
公称通径Nominal Diameter外径Outside Diameter D厚度Thickness长度LengthDN
1014
2-560901201501801518
2025
2532
3238
4045
5057国际通用系列钢管(英制管) Inch Pipe国内沿用系列钢管(公制管) Metric Pipe
C 三种型式，短管(公制管)仅有 C 型04 不锈钢(英制管),Φ18*2 L100 20 钢(公制管)3. 双头螺纹短节
国际通用系列钢管(英制管) Inch Pipe公称通径Nominal Diameter外径Outside Diameter DSch40 STDSch80XSSch160 XXSLDNNPS
81/413.5○
6090120150180103/817.2○ 151/221.3○○
203/426.7○○
25133.4○○
321.1/442.2○○
401.1/248.3○○
50260.3○○
公称通径Nominal Diameter外径Outside Diameter D厚度Thickness长度LengthDN
1014
2-560901201501801518
2025
2532
3238
4045
5057
粗细超粗细超11/320.03130.793311/161.062526.991821/160.06251.593411/81.125028.587121833/320.09382.383513/161.187530.161841/80.12503.183611/41.250031.757121855/320.15633.973715/161.312533.341863/160.18754.763813/81.375034.936121877/320.21885.563917/161.437536.511881/40.25006.352028324011/21.500038.106121899/320.28137.144119/161.562539.6918105/160.31257.941824324215/81.625041.28181111/320.34388.7343111/161.687542.8618123/80.37509.531624324413/41.750044.4551313/320.406310.3245113/161.812546.04147/160.437511.111420284617/81.875047.631515/320.468811.9147115/161.937549.21161/20.500012.701320284822.000050.8041/21717/320.531313.494921/82.125053.98189/160.562514.291218245021/42.250057.1541/21919/320.593815.085123/82.375060.33205/80.625015.881118245221/22.500063.5042121/320.656316.675325/82.625066.682211/160.687517.46245423/42.750069.8542323/320.718818.265527/82.875073.03243/40.750019.051016205633.000076.2042525/320.781319.845731/83.125079.382613/160.812520.64205831/43.250082.5542727/320.843821.435933/83.375085.73287/80.875022.23914206031/23.500088.9042929/320.906323.026135/83.625092.083015/160.937523.81206233/43.750095.2543131/320.968824.616337/83.875098.433211.000025.40812206444.0000101.604螺 距公 英 制 对 照英制(英寸)公制(毫米)螺 距序号英制(英寸)公制(毫米)序号
公制 英制 美制螺纹对照表 螺纹标准手册
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 M10×1
M1.6×0.35 M3×0.5 M7×0.75 M10×1.25
M1.7×0.25 M3×0.6 M7×1 M10×1.5
M1.7×0.35 M3.5×0.6 M8×0.75 M11×1
M1.8×0.35 M4×0.5 M8×1 M11×1.5
M2×0.4 M4×0.7 M8×1.25 M12×1
M2.2×0.45 M5×0.5 M9×1 M12×1.25
M2.3×0.45 M5×0.8 M9×1.25 M12×1.5
常用规格 （美制）
0-80UNF 5-40UNC 10-32UNF 5/16〃-32UNEF
1-64UNC 5-44UNV 12-24UNC 3/8〃-16UNC
1-72UNF 6-32UNC 12-28UNF 3/8〃-24UNF
2-56UNC 6-40UNF 12-32UNEF 3/8〃-32UNEF
2-64UNF 5/32〃-32UNC 1/4〃-20UNC 7/16〃-14UNC
3-48UNC 8-32UNC 1/4〃-28UNF 7/16〃-20UNF
3-56UNF 8-36UNF 1/4〃-32UNEF 7/16〃-28UNEF
4-40UNC 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〃-4.5
5/32〃-32 9/16〃-12 1-1/8〃-7 2-1/8〃-4
