1、公制螺纹公制细牙螺纹规格钻孔直径规格钻孔直径标准直径最大最小标准直径最大最小M10.750.7850.729M1*0.20.80.8210.783M21.61.6791.567M2*0.251.7251.7851.729M32.52.5992.459M3*0.352.72.7212.621M43.33.4223.242M4*0.53.53.5993.459M54.24.3344.134M5*0.54.54.5994.459M655.1534.917M6*0.755.35.3785.188M766.1535.917M7*0.756.36.3786.188M86.86.9126.647M8*177
2、.1536.917M108.58.6768.376M8*0.757.37.3787.188M1210.2510.44110.106M10*1.258.88.9128.647M141212.2111.835M10*199.1538.917M161414.2113.835M10*0.759.39.3789.188M1815.515.74415.294M12*1.510.510.67610.376M2017.517.74417.294M12*1.2510.810.91210.647M2219.519.74419.294M12*11111.15310.917M242121.25220.752M14*1
3、.512.512.67612.376M272424.25223.752M14*1.2512.812.91212.647M3026.526.77126.211M14*11313.15312.917M3329.529.77129.211M16*1.514.514.67614.376M363232.2731.67M16*11515.15314.917M393535.2734.67M18*21616.2115.835M18*1.516.516.67616.376M18*11717.15316.917M20*21818.2117.835M20*1.518.518.67618.376M20*11919.1
4、5318.917M22*22020.2119.835M22*1.520.520.67620.376M22*12121.15320.917M24*22222.2121.835M24*1.522.522.67622.376M24*12323.15322.917M27*22525.2124.835M27*1.525.525.67625.376M27*12626.15325.917M30*32727.25226.752M30*22828.2127.835M30*1.528.528.67628.376M30*12929.15328.9175555圆锥内螺纹（ Rc)圆柱内螺纹（ Rp)规格钻孔直径规格钻
5、孔直径标准直径最大最小标准直径最大最小1/16-286.56.6326.491/16-286.36.3846.2441/8-288.58.6378.4951/8-288.38.3888.2491/4-1911.411.54911.3411/4-191111.17410.9623/8-1914.915.04514.8463/8-1914.514.65814.4481/2-1418.618.77318.4891/2-1418.118.26317.9793/4-142424.25923.9753/4-1423.523.66323.3781-1130.230.47230.111-1129.629.82
6、229.4591 1/4 -1138.839.13338.7711 1/4 -1138.238.33937.9761 1/2 -1144.745.02644.6641 1/2 -114444.23243.8692-1156.556.83756.4752-1155.655.84455.412螺纹钻孔直径对照表55非密封圆柱内螺纹（ G)60圆锥内螺纹（ NPT)规格钻孔直径规格钻孔直径标准直径最大最小标准直径最大最小1/16-286.76.8436.5611/16-276.1356.2236.0461/8-288.78.8488.5661/8-278.488.5688.3931/4-1911.7
7、11.8911.4451/4-1810.99611.12810.8643/8-1915.215.39514.953/8-1814.41614.28414.5481/2-141919.17218.6311/2-1417.81317.64217.9835/8-142121.12820.5873/4-1423.12723.29722.9573/4-1424.524.65824.1171-11.529.05929.26628.8517/8-1428.228.41827.8771 1/4 -11.537.78437.99137.5761-1130.630.93130.2911 1/2 -11.543.8
8、544.0643.6461 1/8 -1135.235.57934.9392-11.555.8656.0755.6591 1/4 -1139.239.59238.9521 1/2 -114545.48544.8451 3/4 -115151.42850.7882-115757.29656.65660圆柱内螺纹（ NPSC)统一螺纹（ UNF）规格钻孔直径规格钻孔直径标准直径最大最小标准直径最大最小1/8-278.488.88.636N0.0-801.251.3051.181/4-1811.3511.4711.227N0.1-721.551.6121.4733/8-1814.7714.914.6
9、56N0.2-641.851.9121.7551/2-1417.81317.64218.161N0.3-562.12.1972.0243/4-1423.12723.29723.495N0.4-482.42.4582.2711-11.529.05929.26629.489N0.5-442.72.742.5511 1/4 -11.537.78437.99138.252N0.6-402.93.0222.8171 1/2 -11.543.8544.0644.323N0.8-363.53.6063.4012-11.555.8656.0756.363N0.10 -324.14.1653.967N0.12
10、-284.64.7244.5031/4-285.55.5885.3675/16-246.97.0356.7913/8-248.58.6368.3797/16-209.910.0339.7381/2-2011.511.60711.3269/16-1812.913.08112.7615/8-1814.514.68114.3483/4-1617.517.67817.337/8-1420.520.67520.261 -1223.323.57123.1091 1/8 -1226.526.74626.2841 1/4 -1229.629.92129.4591 3/8 -1232.833.09632.634
11、1 1/2 -353636.27135.809统一螺纹（ UNC）统一螺纹（ UNEF）规格钻孔直径规格钻孔直径标准直径最大最小标准直径最大最小N0.1-641.51.5851.435N0.12 -324.7224.8164.628N0.2-561.781.8721.6941/4-325.5855.6795.491N0.3-482.142.041.945/16-327.1727.2677.079N0.4-402.272.3852.1563/8-328.768.8548.666N0.5-402.5932.6982.4877/16-2810.23710.34310.13N0.6-322.772.8
12、992.651/2-2811.82411.9311.717N0.8-323.4183.5283.3079/16-2413.26513.38813.142N0.10 -243.8143.9493.685/8-2414.8514.97514.729N0.12 -244.464.594.3411/16 -2416.4416.56316.3171/4-205.1215.2674.9753/4-2017.82117.96717.6755/16-186.5716.7336.4113/16 -2019.40919.55519.2633/8-167.9798.1587.87/8-2020.99621.1420
13、.857/16-149.359.559.14915/16 -2022.58522.73122.4391/2-1310.79811.01310.5841-2024.17224.31824.0269/16-1212.913.08112.76111/16 -1825.62225.78425.4615/8-1113.62213.86813.37611/8 -1827.2127.37127.0493/4-1016.56616.83216.29913/16 -1828.79728.95928.6367/8-919.45819.74819.16911/4 -1830.39430.55530.2331-822
14、.2822.59821.96315/16 -1831.9732.13331.811 1/8 -724.99825.34924.64813/8 -1833.55933.7233.3981 1/4 -728.17328.52427.82317/16 -1835.0735.23334.911 3/8 -632.831.1230.34311/2 -1836.73436.89636.5731 1/2 -633.90734.29533.51819/16 -1838.1238.48338.161 3/4 -539.3839.8138.9515/8 -1839.90940.0739.7482-4 1/245.14445.59844.689111/16 -1841.49741.65841.336
