美制螺纹底孔直径表.docx

美制粗螺纹美制细螺纹

规格

2级牙钻孔径规格2级牙钻孔径标准径标准径

（UNC)最大最小（UNF)最大最小NO.1-64(1.854) 1.55 1.582 1.425NO.0-80(1.524) 1.25 1.305 1.182 NO.2-56(2.184) 1.80 1.871 1.695NO.1-72(1.854) 1.55 1.612 1.474 NO.3-48(2.515) 2.10 2.146 1.941NO.2-64(2.184) 1.85 1.912 1.756

NO.4-40(2.845) 2.30 2.385 2.157NO.3-56(2.515) 2.10 2.197 2.025 NO.5-40(3.175) 2.60 2.697 2.487NO.4-48(2.845) 2.40 2.458 2.271 NO.6-32(3.505) 2.80 2.895 2.642NO.5-44(3.175) 2.70 2.740 2.551 NO.8-32(4.166) 3.40 3.530 3.302NO.6-40(3.505) 2.90 3.022 2.820 NO.10-24(4.826) 3.90 3.962 3.683NO.8-36(4.166) 3.50 3.606 3.404 NO.12-24(5.486) 4.50 4.597 4.344NO.10-32(4.826) 4.10 4.165 3.963 1/4-20 5.10 5.257 4.979NO.12-28(5.846) 4.60 4.724 4.496 5/16 -18 6.60 6.731 6.4011/4-28 5.50 5.588 5.360 3/8 -168.008.1537.7985/16-24 6.907.035 6.782 7/16-149.409.5509.1443/8-248.508.6368.382 1/2-1310.8011.02310.5927/16-209.9010.0339.729 9/16-1212.2012.44611.9891/2-2011.5011.60711.329 5/8-1113.6012.86813.3869/16-1812.9013.08112.751 3/4-1016.5018.84016.3075/8-1814.5014.68114.351 7/8-919.5019.76119.1773/4-1617.5017.67817.323 1-822.2022.60621.9717/8-1420.5020.67520.270 1-1/8-725.0025.34924.6381-1223.2023.57123.114 1-1/4-728.2028.52427.8131-1/8-1226.5026.74626.289 1-3/8-630.8031.11530.3531-1/4-1229.5029.92129.464 1-1/2-634.0034.29033.5281-3/8-1232.8033.09632.639 1-3/4-539.5039.82738.9641-1/2-1236.036.27135.814 2-4-1/245.2045.59344.679

美制迫牙丝攻钻孔径美制特细螺纹

精度等级规格2级牙钻孔径规格标准径

G4-G6G7-G8G9（UNEF)最大最小NO.2-56UNC 1.94--NO.12-32 4.70 4.826 4.623 NO.3-48 2.23--1/4--32 5.60 5.690 5.486 NO.4-40 2.50--5/16-327.107.2647.087 NO.5-40 2.83--3/8-328.708.8658.661 NO.6-32 3.07--7/16-2810.2010.33810.135 NO.8-32 3.73 3.77-1/2-2811.8011.93811.709 NO.10-24 4.24 4.30-9/16-2413.2013.38613.132 NO.12-24 4.90 4.96-5/8-2414.8014.98614.732 1/4-20- 5.72-3/4-2017.8017.95817.678 5/16-18-7.24-7/8-2021.0021.13320.853 3/8-16-8.748.811-2024.0024.30824.028

7/16-14-10.2010.30

美制管螺纹1/2-1311.2711.82

NO.2-64UNF 1.97--钻孔径

NO.3-56 2.27--规格NPT

NPS NO.4-48 2.56--使用绞刀时不用绞刀时

NO.5-44 2.86--1/16-27 6.10 6.25 6.35 NO.6-40 3.16--1/8-278.338.438.74 NO.8-36 3.78--1/4-1810.7211.1311.13 NO.10-32 4.39 4.43-3/8-1814.2714.2714.68 NO.12-28 4.99 5.04-1/2-1417.4817.8618.26 1/4-28 5.85 5.90-3/4-1422.6323.0123.42 5/16-247.367.41-1-11-1/228.5828.9829.36 3/8-24-9.00-1-1/4-11-1/237.3137.6938.10 7/16-20-10.4810.541-1/2-11-1/243.6644.0444.45 1/2-20-12.0712.132-11-1/255.5855.9656.36

英制电器螺纹

规格钻孔径

2BA 4.0-4.2

3BA

4BA 3.0-3.2

5BA 2.7-2.8

6BA 2.4-2.5