螺纹对照表
美制细螺纹
标 2 级牙钻 规格 (UNF) 准 孔径 规格
美制粗螺纹
标 2 级牙钻 (UNC) 准 孔径
径 最大 最小
NO.0-80(1.524) NO.1-72(1.354) NO.2-64(2.184) NO.3-56(2.515) NO.4-48(2.845) NO.5-44(3.175) NO.6-40(3.505) NO.8-36(4.166) NO.10-32(4.826) NO.12-28(5.346) 1/4-28 5/16-24 3/8-24 7/16-20 1/2-20 9/16-18 5/8-18 3/4-16 7/8-14 1 -12 1.25 1.55 1.85 2.10 2.40 2.70 2.90 3.50 4.10 4.60 5.50 6.90 8.50 9.90 1.305 1.612 1.912 2.197 2.458 2.740 3.022 3.606 4.165 4.724 5.588 7.035 8.636 10.033 1.162 1.474 1.736 2.025 2.271 2.551 2.820 3.404 3.963 4.496 5.360 6.782 8.382 9.729 NO.1-64(1.854) NO.2-56(2.184) NO.3-48(2.515) NO.4-40(2.845) NO.5-40(3.175) NO.6-32(3.505) NO.8-32(4.166) NO.10-24(4.826) NO.12-24(5.346) 1/4-28 5/16-18 3/8-16 7/16-14 1/2-13 9/16-12 5/8-11 3/4-10 7/8-9 1 -8
径 最大 最小
1.55 1.80 2.10 2.30 2.60 2.80 3.40 3.90 4.50 5.10 6.60 8.00 9.40 1.582 1.871 2.146 2.385 2.697 2.895 3.530 3.962 4.597 5.257 6.731 8.153 9.550 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 38.528 38.964 44.679
10.80 11.023 12.20 12.446 13.60 12.868 16.50 18.840 19.50 19.761 22.20 22.606 25.00 25.349 28.20 28.524 30.80 31.115 34.00 34.290 39.50 39.327 45.20 45.593
11.50 11.607 11.329 12.90 13.081 12.751 14.50 14.581 14.351 17.50 17.678 17.323 20.50 20.675 20.270 23.20 23.571 23.114 26.50 26.746 26.269 29.50 29.921 29.464 32.80 33.096 32.639 36.00 36.271 35.814
1-1/8-7 1-1/4-7 1-3/8-6 1-1/2-6 1-3/4-5 2 -4-1/2
1-1/8-12 1-1/4-12 1-3/8-12 1-1/2-12
RP:密封性圆柱螺纹,内螺纹,螺纹孔 RC:密封性锥螺纹,内螺纹,螺纹孔 G:非密封性圆柱螺纹,内螺纹