公称 螺纹牙牙螺公差螺纹外径螺纹中径螺纹小径 公差螺纹小径螺纹中径螺纹外径钻孔 直径规格数高距代号MaxMinMaxMinMax代号MinMaxMinMaxMin直径 0.073（#1） 1-64UNC640.2360.3972A1.838961.742441.582421.531621.366522B1.424941.582421.597661.66371.85421.397 1.8543A1.85421.757681.597661.559561.381763B1.424941.582421.597661.645921.85421.397 1-72UNF720.210.3532A1.838961.750061.610361.56211.419862B1.47321.61291.62561.68911.85421.5113 3A1.85421.76531.62561.590041.43513B1.47321.61291.62561.673861.85421.5113 0.086(#2)2-56UNC560.2710.4542A2.169162.065021.874521.821181.630682B1.694181.871981.889761.960882.18441.7018 2.1843A2.18442.080261.889761.849121.645923B1.694181.871981.889761.94312.18441.7018 2-64UNF640.2360.3972A2.169162.072641.912621.861821.696722B1.755141.912621.927861.996442.18441.778 3A2.18442.087881.927861.889761.711963B1.755141.912621.927861.978662.18441.778 0.099(3#)3-48UNC480.3150.5292A2.496822.382522.153922.09551.864362B1.940562.14632.17172.24792.51461.9939 2.5153A2.51462.40032.17172.128521.882143B1.940562.14632.17172.227582.51461.9939 3-56UNF560.2710.4542A2.496822.392682.202182.14631.958342B2.024382.19712.219962.291082.51462.0574 3A2.51462.410462.219962.179321.976123B2.024382.19712.219962.27332.51462.0574 0.112(#4)4-40UNC400.3780.6352A2.824482.694942.4132.34952.067562B2.156462.385062.433322.517142.84482.1844 2.8453A2.84482.715262.433322.385062.087883B2.156462.385062.433322.494282.84482.1844 4-48UNF480.3150.5292A2.827022.712722.484122.423162.194562B2.270762.458722.50192.580642.84482.2606 3A2.84482.73052.50192.456182.212343B2.270762.458722.50192.560322.84482.2606 0.125(#5)5-40UNC400.3780.6352A3.154683.025142.74322.677162.397762B2.486662.697482.763522.847343.1752.5273 3.1753A3.1753.045462.763522.715262.418083B2.486662.697482.763522.827023.1752.5273 5-44UNF440.3440.5772A3.157223.03532.78132.71782.468882B2.550162.740662.799082.880363.1752.5781 3A3.1753.053082.799082.750822.486663B2.550162.740662.545082.860043.1752.5781 0.138(#6）6-32UNC320.4720.7942A3.484883.332482.969262.898142.542B2.64162.89562.989583.083563.50522.7051 3.5053A3.50523.35282.989582.936242.560323B2.64162.89562.989583.058163.50522.7051 6-40UNF400.3780.6352A3.484883.355343.07343.007362.727962B2.81943.02263.093723.180083.50522.8702 3A3.50523.375663.093723.042922.748283B2.81943.012443.093723.157223.50522.8702 0.164（#8） 8-32UNC320.4720.7842A4.142743.990343.627123.553463.197862B3.3023.53063.649983.74654.16563.4544 4.1663A4.16564.01323.649983.59413.220723B3.3023.528063.649983.72114.16563.4544 8-36UNF360.4210.7062A4.145284.005583.688083.616963.304542B3.40363.60683.70843.799844.16563.4544 UN 美制螺纹尺寸 Unit=mm 外螺纹尺寸内螺纹尺寸 1 / 22 3A4.16564.02593.70843.655063.324863B3.40363.596643.70843.776984.16563.4544 0.19（#10） 10-24UNC240.631.0582A4.80064.617724.112264.028443.540762B3.6833.96244.137664.246884.8263.7338 4.8263A4.8264.643124.137664.074163.566163B3.6833.94974.137664.218944.8263.7338 10-28UNS280.540.9072A4.80064.63554.211324.12753.718562B3.83544.0644.236724.345944.8263.8608 10-32UNF320.4720.7842A4.803144.650744.287524.211323.858262B3.96244.16564.310384.409444.8263.9878 3A4.8264.67364.310384.251963.881123B3.96244.168144.310384.384044.8263.9878 10-36UNS360.4210.7062A4.803144.663444.345944.269743.96242B4.0644.21644.36884.467864.8264.0386 10-40UNS400.3780.6352A4.803144.67364.391664.3184.043682B4.14024.29264.414524.50854.8264.0894 10-48UNS480.3150.5292A4.805684.691384.462784.396744.175762B4.24184.36884.48314.569464.8264.2164 10-56UNS560.2710.4542A4.808224.704084.513584.450084.269742B4.34344.4454.531364.612644.8264.3053 0.216（#12）12-24UNC240.631.0582A5.4615.278124.772664.68634.201162B4.34344.59744.798064.909825.48644.4958 0.4863A5.48645.303524.798064.732024.226563B4.34344.589784.798064.881885.48644.4958 12-28UNF280.540.9072A5.4615.29594.871724.790444.378962B4.49584.72444.897125.00385.48644.572 3A5.48645.32134.897124.836164.404363B4.49584.716784.897124.975865.48644.572 12-32UNEF320.4720.7842A5.463545.311144.947924.869184.518662B4.62284.8264.970785.074925.48644.572 3A5.48645.3344.970784.909824.541523B4.62284.81334.970785.049525.48644.572 12-36UNS360.4210.7062A5.463545.323845.006344.930144.879342B4.72444.87685.02925.128265.48644.8006 12-40UNS400.3780.6352A5.463545.3345.052064.97844.66092B4.80064.9535.074925.16895.48644.8514 12-48UNS480.3150.5292A5.466085.351785.123185.057144.836162B4.90225.02925.14355.229865.48644.9784 12-56UNS560.2710.4542A5.468625.364485.173985.110484.930142B5.00385.10545.191765.273045.48644.9784 0.251/4-20UNC200.7561.271A6.322066.012185.496565.354324.810761B4.97845.25785.52455.709926.355.1054 6.352A6.322066.116325.496565.402584.810762B4.97845.25785.52455.648966.355.1054 3A6.356.144265.52455.453384.83873B4.97845.250185.52455.615946.355.1054 1/4-24UNS240.631.0582A6.322066.139185.633725.539745.062222B5.2075.4615.661665.783586.355.3086 1/4-27UNS270.560.9412A6.32466.154425.712465.623565.204462B5.3345.56265.737865.852166.355.4102 1/4-28UNF280.540.9071A6.32466.075685.735325.608325.242561B5.35945.5885.760725.925826.355.4102 2A6.32466.15955.735325.65155.242562B5.35945.5886.827525.869946.355.4102 3A6.356.18495.760725