美制螺纹尺寸表外螺纹公称螺纹牙牙螺公差螺纹外径螺纹中径螺纹小径公差螺纹直径规格数高距代号MaxMinMaxMinMax代号Min0.073（#1）1-64UNC640.2360.3972A1.838961.742441.582421.531621.366522B1.424941.8543A1.85421.757681.597661.559561.381763B1.424941-72UNF720.210.3532A1.838961.750061.610361.56211.419862B1.47323A1.85421.76531.62561.590041.43513B1.47320.086(#2)2-56UNC560.2710.4542A2.169162.065021.874521.821181.630682B1.694182.1843A2.18442.080261.889761.849121.645923B1.694182-64UNF640.2360.3972A2.169162.072641.912621.861821.696722B1.755143A2.18442.087881.927861.889761.711963B1.755140.099(3#))3-48UNC480.3150.5292A2.496822.382522.153922.09551.864362B1.940562.5153A2.51462.40032.17172.128521.882143B1.940563-56UNF560.2710.4542A2.496822.392682.202182.14631.958342B2.024383A2.51462.410462.219962.179321.976123B2.024380.112(#4)4-40UNC400.3780.6352A2.824482.694942.4132.34952.067562B2.156462.8453A2.84482.715262.433322.385062.087883B2.156464-48UNF480.3150.5292A2.827022.712722.484122.423162.194562B2.270763A2.84482.73052.50192.456182.212343B2.270760.125(#5)5-40UNC400.3780.6352A3.154683.025142.74322.677162.397762B2.486663.1753A3.1753.045462.763522.715262.418083B2.486665-44UNF440.3440.5772A3.157223.03532.78132.71782.468882B2.550163A3.1753.053082.799082.750822.486663B2.550160.138(#6）6-32UNC320.4720.7942A3.484883.332482.969262.898142.542B2.64163.5053A3.50523.35282.989582.936242.560323B2.64166-40UNF400.3780.6352A3.484883.355343.07343.007362.727962B2.81943A3.50523.375663.093723.042922.748283B2.81940.164（#8）8-32UNC320.4720.7842A4.142743.990343.627123.553463.197862B3.3024.1663A4.16564.01323.649983.59413.220723B3.3028-36UNF360.4210.7062A4.145284.005583.688083.616963.304542B3.40363A4.16564.02593.70843.655063.324863B3.40360.19（#10）10-24UNC240.631.0582A4.80064.617724.112264.028443.540762B3.6834.8263A4.8264.643124.137664.074163.566163B3.68310-28UNS280.540.9072A4.80064.63554.211324.12753.718562B3.835410-32UNF320.4720.7842A4.803144.650744.287524.211323.858262B3.96243A4.8264.67364.310384.251963.881123B3.962410-36UNS360.4