螺纹基本尺寸对照表

1、英制管螺纹基本尺寸及公差（牙形角55o）BSPP螺纹代号G1/8× 28G1/4× 19G3/8× 19G1/2× 14G5/8× 14G3/4× 14G1× 11G1.1/4× 11G1.1/2× 11G2× 11G2.1/2 ” X11G3” X11G3.1/2 ” X11基本直径内螺纹外螺纹A 级B 级大径中径小径中径公差小径公差中径公差大径公差中径公差大径公差9.7289.1478.566+0.170+0.28200000-0.107-0.214-0.214-0.21413.15712.

2、30111.445+0.125+0.445-0.125-0.250-0.2500-0.25016.66215.80614.950+0.125+0.445000000-0.125-0.250-0.250-0.25020.95519.79318.631+0.142+0.541000000-0.142-0.284-0.284-0.28422.91121.74920.587+0.142+0.541000000-0.142-0.284-0.284-0.28426.44125.27924.117+0.142+0.541000000-0.142-0.284-0.284-0.28433.24931.77030

3、.291+0.180+0.640000000-0.180-0.360-0.360-0.36041.91040.43138.952+0.180+0.640000000-0.180-0.360-0.360-0.36047.80346.32444.854+0.180+0.640000000-0.180-0.360-0.360-0.36059.61458.13556.656+0.180+0.640000000-0.180-0.360-0.360-0.36075.18473.70572.226+0.217+0.640000000-0.217-0.434-0.434-0.43487.88486.40584

4、.926+0.217+0.640000000-0.217-0.434-0.434-0.434100.33098.85197.372+0.217+0.640000000-0.217-0.434-0.434-0.434英制锥管螺纹基本尺寸及公差（牙形角55o）BSPT基面上的直径基准长度有效螺纹长度圆锥内螺纹基面轴向螺纹代号大径中径小径基本最大最小基本最大最小位移偏差（ ± mm）R1/8×289.7289.1478.5664.04.93.16.57.45.61.1R1/4×1913.15712.30111.4456.07.34.79.711.08.41.7R3/8&

5、#215;1916.66215.80614.9506.47.75.110.111.48.81.7R1/2×1420.95519.79318.6318.210.06.413.215.011.42.3R3/4×1426.44125.27924.1179.511.37.714.516.312.72.3R1× 1133.24931.77030.29110.412.78.116.819.114.52.9R1.1/4× 1141.91040.43138.95212.715.010.419.121.416.82.9R1.1/2× 1147.80346.324

6、44.84512.715.010.419.121.416.82.9R2× 1159.61458.13556.65615.918.213.623.425.721.12.9R2.1/2 ” X1175.18473.70572.22617.521.014.026.730.223.23.5R3” X1187.88486.40584.92620.624.117.129.833.326.33.5R3.1/2 ” X11100.33098.85197.37222.225.718.731.434.927.93.5美制管螺纹基本尺寸及公差（牙形角60o）UN(F)螺纹代号7/16× 20UN

7、F 1/2× 20UNF 9/16× 18UNF 3/4× 16UNF 7/8× 14UNF1-1/16× 12UN1-5/16× 12UN1-5/8 × 12UN1-7/8 × 12UN2-1/2 × 12UN9/16× 18UNF 11/16× 16UN 13/16× 16UN 1× 14UNF 1-3/16× 12UN 1-7/16× 12UN 1-11/16× 12UN 2× 12UN5/8× 18UNF 1

8、-1/16× 14UN外螺纹内螺纹公差等级公差等级2A2B大径中径小径小径中径大径最大最小最大最小最小最大最小最大JIC 螺纹11.07910.87410.25410.1479.5689.72810.03310.28710.42411.11312.66712.46111.84111.73211.15611.32811.60811.87512.01712.714.25214.03113.33513.22112.57312.75113.08113.37113.5214.28819.01218.77317.98117.85417.1217.32317.67818.01918.18419.0

9、522.18421.92321.00620.86920.02520.26920.67621.04621.22422.22526.94426.65525.5725.42524.42524.68925.14625.61325.80126.98833.29433.00531.9231.77330.77531.03931.49631.96332.15433.33841.22940.9439.88539.70538.7138.98939.44639.90140.09441.27547.57947.2946.20546.05345.0645.33945.79646.25146.44947.62563.45

10、263.16262.07861.9260.93261.21461.67162.12662.33263.5ORFS 螺纹14.25214.03113.33513.22112.57312.75113.08113.37113.5214.28817.42717.18816.39616.27415.53515.74816.10416.43116.58917.46320.59920.36119.56819.44418.70718.92319.27919.60619.76620.63825.35725.09524.17824.03623.19523.44423.82524.22124.40725.430.1

11、1929.8328.74528.59827.627.86428.32128.78828.97930.16336.46736.17735.09334.94333.94734.21434.67135.13835.33136.51342.81742.52741.44341.2940.29740.56441.02141.48841.68642.86350.75450.46549.3849.22548.23548.51448.97149.42649.62750.8SAE 螺纹15.83915.61814.92314.80314.16114.35114.68114.95815.1115.87526.947

12、26.68325.74325.60824.7424.96825.37525.78325.96126.987其它美制螺纹9/16× 16UN14.25214.01313.22113.10112.3612.57312.92913.25613.41114.2887/8× 12UN22.18221.89220.80820.66819.66219.93920.39620.85121.03422.2252-1/4 × 12UN57.10456.81555.7355.57554.58554.86455.32155.77655.97657.15注： UNC 粗牙螺纹系列，UNF

13、细牙螺纹系列，UNEF 超细牙螺纹系列，UN 不变螺距系列布锥管螺纹基本尺寸及公差 (牙形角 60o)NPT螺纹代号基面上的直径螺纹长度大径中径小径有效长度管端至基面长Z1/8 × 2710.2729.5198.76674.572Z1/4 ×1813.57212.44311.3149.55.080Z3/8 ×1817.05515.92614.79710.56.096Z1/2 ×1421.22319.77218.32113.58.028Z3/4 ×1426.56825.11723.666148.611Z1 × 11.533.22831.

14、46129.69417.510.160Z1.1/4×11.541.98540.21838.4511810.688Z1.1/2×11.548.05446.28744.52018.510.688Z2 × 11.560.09258.32556.5581911.074公制螺纹基本尺寸及公差(牙形角 60o)M基本直径螺纹代号大径中径小径M10X1109.3508.917M12X11211.35010.917M14X11413.35012.917M12X1.251211.18810.647M14X1.251413.18812.647M12X1.51211.02610.376

15、M14X1.51413.02612.376M16X1.51615.02614.376M18X1.51817.02616.373M20X1.52019.02618.376M22X1.52221.02620.376M24X1.52423.02622.376M26X1.52625.02624.376M27X1.52726.02625.376M30X1.53029.02628.376M33X1.53332.02631.376M36X1.53635.02634.376M39X1.53938.02637.376M42X1.54241.02640.376M27X22725.70124.835M30X2302

16、8.70127.835M33X23331.70130.835M36X23634.70133.835M39X23937.70136.835M42X24240.70139.835M45X24543.70142.835M52X25250.70149.835M60X26058.70157.835M64X26462.70161.835M72X27270.70169.835内 螺 纹外螺纹公差等级公差等级6H7H6g中径公差小径公差中径公差小径公差中径公差大径公差+0.150+0.236+0.190+0.300-0.026-0.0260000-0.138-0.206+0.160+0.236+0.200+0

17、.300-0.026-0.0260000-0.144-0.206+0.160+0.236+0.200+0.300-0.026-0.0260000-0.144-0.206+0.180+0.265+0.224+0.335-0.028-0.0280000-0.160-0.240+0.180+0.265+0.224+0.335-0.028-0.0280000-0.160-0.240+0.190+0.300+0.236+0.375-0.032-0.0320000-0.172-0.268+0.190+0.300+0.236+0.375-0.032-0.0320000-0.172-0.268+0.190+0

18、.300+0.236+0.375-0.032-0.0320000-0.172-0.268+0.190+0.300+0.236+0.375-0.032-0.0320000-0.172-0.268+0.190+0.300+0.236+0.375-0.032-0.0320000-0.172-0.268+0.190+0.300+0.236+0.375-0.032-0.0320000-0.172-0.268+0.200+0.300+0.250+0.375-0.032-0.0320000-0.182-0.268+0.200+0.300+0.250+0.375-0.032-0.0320000-0.182-0.268+0.200+0.300+0.250+0.375-0.032-0.0320000-0.182-0.268+0.200+0.300+0.250+0.375-0.032-0.0320000-0.182-0.268+0.200+0.300+0.250+0.375-0.032-0.0320000-0.182-0.268+0.200+0.300+0.250+0.375-0.032-0.0320000-0.182-0.268+0.200+0.300+0.250+0.375-0.032-0.0320000-0.182-0