美制螺纹公差表

无镀层成品螺纹的尺寸极限和公差 1A级外螺纹 标 记 外 径中 径内 径 最 大最 小公 差最 大最 小公 差最 大最 小公 差 1/4-28 UNF-1A6.3256.0760.2495.7355.6080.1275.2125.0190.193 5/16-24 UNF-1A7.917.6350.2747.2217.0820.146.6126.3960.216 3/8-24 UNF-1A9.4979.2230.2748.8098.6640.1458.1997.9780.221 7/16-20 UNF-1A11.07910.770.3110.25410.0970.1579.5229.2740.249 1/2-20 UNF-1A12.66712.3570.3111.84111.6790.16311.1110.8560.254 9/16-18 UNF-1A14.25213.9190.33313.33513.1620.17312.5212.2450.274 5/8-18 UNF-1A15.83915.5070.33314.92314.7450.17814.10713.8280.279 3/4-16 UNF-1A19.01218.6510.36117.98117.790.19117.06416.7590.305 7/8-14 UNF-1A22.18421.7910.39421.00620.80.20619.95919.6240.335 1-12 UNF-1A25.35424.9170.43723.9823.7570.22422.75822.3820.376 11/8-12 UNF-1A28.52928.0920.43727.15526.9270.22925.93325.5520.381 11/4-12 UNF-1A31.70431.2670.43730.3330.0960.23429.10828.7220.386 13/8-12 UNF-1A34.87734.440.43733.50333.2640.23932.28131.890.391 11/2-12 UNF-1A38.05237.6150.43736.67836.4340.24435.45635.060.396 无镀层成品螺纹的尺寸极限和公差 2A级外螺纹 标 记 外 径中 径内 径 最 大最 小公 差最 大最 小公 差最 大最 小公 差 1/4-28 UNF-2A6.3256.160.1655.7355.6520.0845.2125.0620.15 5/16-24 UNF-2A7.917.7270.1837.2217.1270.0946.6126.4410.17 3/8-24 UNF-2A9.4979.3140.1838.8098.7120.0978.1998.0260.173 7/16-20 UNF-2A11.07910.8740.20610.25410.1470.1079.5229.3240.198 1/2-20 UNF-2A12.66712.4610.20611.84111.7320.10911.1110.9090.201 9/16-18 UNF-2A14.25214.0310.22113.33513.2210.11412.5212.3040.216 5/8-18 UNF-2A15.83915.6180.22114.92314.8030.11914.10713.8860.221 3/4-16 UNF-2A19.01218.7730.23917.98117.8540.12717.06416.8220.241 7/8-14 UNF-2A22.18421.9230.26221.00620.8690.13719.95919.6930.267 1-12 UNF-2A25.35425.0650.2923.9823.830.1522.75822.4560.302 11/8-12 UNF-2A28.52928.240.2927.15527.0030.15225.93325.6290.305 11/4-12 UNF-2A31.70431.4150.2930.3330.1730.15729.10828.7990.31 13/8-12 UNF-2A34.87734.5870.2933.50333.3430.1632.28131.9680.312 11/2-12 UNF-2A38.05237.7620.2936.67836.5150.16335.45635.1410.315 无镀层成品螺纹的尺寸极限和公差 3A级外螺纹 标 记 外 径中 径内 径 最 大最 小公 差最 大最 小公 差最 大最 小公 差 1/4-28 UNF-3A6.356.1850.1655.7615.6970.0645.2375.1080.13 5/16-24 UNF-3A7.9387.7550.1837.2497.1810.0696.646.4950.145 3/8-24 UNF-3A9.5259.3420.1838.8378.7630.0748.2278.0770.15 7/16-20 UNF-3A11.11310.9070.20610.28710.2080.0799.5559.3850.17 1/2-20 UNF-3A12.712.4940.20611.87511.7930.08111.14310.970.173 9/16-18 UNF-3A14.28814.0670.22113.37113.2840.08612.55512.3670.188 5/8-18 UNF-3A15.87515.6540.22114.95814.8690.08914.14313.9520.191 3/4-16 UNF-3A19.0518.8110.23918.01917.9220.09717.10216.8910.211 7/8-14 UNF-3A22.22521.9630.26221.04620.9420.1042019.7660.234 1-12 UNF-3A25.425.110.2924.02623.9140.11222.80422.540.264 11/8-12 UNF-3A28.57528.2850.2927.20127.0870.11425.97925.7120.267 11/4-12 UNF-3A31.7531.460.2930.37630.2590.11729.15428.8850.269 13/8-12 UNF-3A34.92534.6350.2933.55133.4310.11932.32932.0570.272 11/2-12 UNF-3A38.137.810.2936.72636.6040.12235.50435.230.274 无镀层成品螺纹的尺寸极限和公差 1B级内螺纹 标 记 内 径中 径外 径 最 小最 大公 差最 小最 大公 差最 小 1/4-28 UNF-1B5.3675.580.2135.7615.9260.1656.35 5/16-24 UNF-1B6.7927.0380.2467.2497.430.187.938 3/8-24 UNF-1B8.3798.6260.2468.8379.0250.1889.525 7/16-20 UNF-1B9.73810.030.29210.28710.4930.20611.113 1/2-20 UNF-1B11.32611.6180.29211.87512.0880.21312.7 9/16-18 UNF-1B12.76113.0840.32313.37113.5970.22614.288 5/8-18 UNF-1B14.34814.6710.32314.95815.1890.23115.875 3/4-16 UNF-1B17.3317.6890.35818.01918.2680.24919.05 7/8-14 UNF-1B20.26220.6630.40121.04621.3160.26922.225 1-12 UNF-1B23.10923.5690.4624.02624.3150.2925.4 11/8-12 UNF-1B26.28426.7440.4627.227.4980.29728.575 11/4-12 UNF-1B29.45929.9190.4630.37630.6810.30531.75 13/8-12 UNF-1B32.63433.0940.4633.55133.8630.31234.925 11/2-12 UNF-1B35.80936.2690.4636.72637.0430.31838.1 无镀层成品螺纹的尺寸极限和公差 2B级内螺纹 标 记 内 径中 径外 径 最 小最 大公 差最 小最 大公 差最 小 1/4-28 UNF-2B5.3675.580.2135.7615.870.1096.35 5/16-24 UNF-2B6.7927.0380.2467.2497.3710.1227.938 3/8-24 UNF-2B8.3798.6260.2468.8378.9610.1249.525 7/16-20 UNF-2B9.73810.030.29210.28710.4240.13711.113 1/2-20 UNF-2B11.32611.6180.29211.87512.0170.14212.7 9/16-18 UNF-2B12.76113.0840.32313.37113.520.1514.288 5/8-18 UNF-2B14.34814.6710.32314.95815.110.15215.875 3/4-16 UNF-2B17.3317.6890.35818.01918.1840.16519.05 7/8-14 UNF-2B20.26220.6630.40121.04621.2240.17822.225 1-12 UNF-2B23.10923.5690.4624.02624.2190.19325.4 11/8-12 UNF-2B26.28426.7440.4627.227.3990.19828.575 11/4-12 UNF-2B29.45929.9190.4630.37630.5790.20331.75 13/8-12 UNF-2B32.63433.0940.4633.55133.7590.20834.925 11/2-12 UNF-2B35.80936.2690.4636.72636.9370.21138.1 无镀层成品螺纹的尺寸极限和公差 3B级内螺纹 标 记 内 径中 径外 径 最 小最 大公 差最 小最 大公 差最 小 1/4-28 UNF-3B5.3675.5630.1965.7615.8420.0816.35 5/16-24 UNF-3B6.7926.9950.2037.2497.3410.0917.938 3/8-24 UNF-3B8.3798.5650.1858.8378.9310.0949.525 7/16-20 UNF-3B9.7389.9470.20810.28710.3910.10411.113 1/2-20 UNF-3B11.32611.5240.19811.87511.9810.10712.7 9/16-18 UNF-3B12.76112.9690.20813.37113.4820.11214.288 5/8-18 UNF-3B14.34814.5540.20614.95815.0720.11415.875 3/4-16 UNF-3B17.3317.5460.21618.01918.1430.12419.05 7/8-14 UNF-3B20.26220.4930.23121.04621.1810.13522.225 1-12