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1、各类螺纹底孔设计尺寸各种螺纹底孔的设计尺寸公制粗牙螺纹JISB0209-1982(单位：mm)螺纹尺寸崁合度划分：中(注1)2级(注2)崁合度划分：中(注1)2级(注2)内螺纹小径钻头直径下孔径最小直径最大直径M10.250.750.78(80%)0.7290.7851.10.250.850.88(80%)0.8290.8851.20.250.950.98(80%)0.9290.9851.40.31.11.14(80%)1.0751.1421.60.351.251.32(75%)1.2211.3211.80.351.451.52(75%)1.4211.52120.41.61.65(80%)1.
2、5671.6792.20.451.751.83(75%)1.7131.8382.50.452.12.13(75%)2.0132.13830.52.52.59(75%)2.4592.5993.50.62.93.01(75%)2.8503.01040.73.33.39(80%)3.2423.4224.50.753.83.85(80%)3.6883.87850.84.24.31(80%)4.1344.3346155.13(80%)4.9175.1537166.13(80%)5.9176.15381.256.86.85(85%)6.6476.91291.257.87.85(85%)7.6477.912
3、101.58.58.62(85%)8.3768.676111.59.59.62(85%)9.3769.676121.7510.310.40(85%)10.10610.4411421212.2(85%)11.83512.2101621414.2(85%)13.83514.210182.515.515.7(85%)15.29415.744202.517.517.7(85%)17.29417.744222.519.519.2(85%)19.29419.7442432121.2(85%)20.75221.2522732424.2(85%)23.75224.252303.526.526.6(90%)26
4、.21126.771333.529.529.6(90%)29.21129.7713643232.1(90%)31.67032.2703943535.1(90%)34.67035.270424.537.537.6(90%)37.12937.799454.540.540.6(90%)40.12940.7994854343.1(90%)42.58743.297注(1)M1.4以低等级：5H、M1.6以上等级：6H(2)鉴于JISB0209-1982标准公制细牙螺纹JISB0211-1982(单位：mm)螺纹尺寸崁合度划分：中(注1)2级(注2)崁合度划分：中(注1)2级(注2)内螺纹小径钻头直径下孔
5、径最小直径最大直径M261.524.524.62(85%)24.37624.6762722525.2(85%)24.83525.210271.525.525.62(85%)25.37625.6762712626.13(80%)25.91726.1532822626.2(85%)25.83526.210281.526.526.62(85%)26.37626.6762812727.13(80%)26.91727.1533032727.2(85%)26.75227.2523022828.2(85%)27.83528.210301.528.528.62(85%)28.37628.6763012929.
6、13(80%)28.91729.1533223030.2(85%)29.83530.210321.530.530.62(85%)30.37630.6763333030.2(85%)29.75230.2523323131.2(85%)30.83531.210331.531.531.62(85%)31.37631.676351.533.533.62(85%)33.37633.6763633333.2(85%)32.75233.2523623434.2(85%)33.83534.210361.534.534.62(85%)34.37634.676381.536.536.62(85%)36.37636
7、.6763933636.2(85%)35.75236.2523923737.2(85%)36.83537.210391.537.537.62(85%)37.37637.6764033737.2(85%)36.75237.2524023838.2(85%)37.83538.210401.538.538.62(85%)38.37638.6764243838.1(90%)37.67038.2704233939.2(85%)38.75239.2524224040.2(85%)39.83540.210421.540.540.62(85%)40.37640.6764544141.1(90%)40.6704
8、1.2704534242.2(85%)41.75242.2524524343.2(85%)42.83543.210451.543.543.62(85%)43.37643.6764844444.1(90%)43.67044.2704834545.2(85%)44.75245.2524824646.2(85%)45.83546.210481.546.546.62(85%)46.37646.6765034747.2(85%)46.75247.2525024848.2(85%)47.83548.210501.548.548.62(85%)48.37648.676注(1)等级：6H鉴于JISB0211-
9、1982标准美制粗牙螺纹(单位：mm)内螺纹小径螺纹尺寸钻头直径2B级螺纹下孔径最小直径最大直径NO.1-64UNC1.551.57(65%)1.4251.5822-561.81.86(65%)1.6951.8713-482.12.14(65%)1.9412.1464-402.32.36(70%)2.1572.3855-402.62.69(70%)2.4872.6976-322.82.86(75%)2.6422.8958-323.43.52(75%)3.3023.53010-243.93.91(80%)3.6833.96212-244.54.57(80%)4.3444.5971/4-205.1
10、5.25(80%)4.9795.2575/16-186.66.72(80%)6.4016.7313/8-1688.15(80%)7.7988.1537/16-149.49.50(80%)9.1449.5501/2-1310.811.0(80%)10.59211.0239/16-1212.212.3(85%)11.98912.4465/8-1113.613.8(85%)13.38613.8683/4-1016.516.8(80%)16.30716.8407/8-919.519.6(85%)19.17719.7611-822.222.5(85%)21.97122.60611/8-72525.2(8
11、5%)24.63825.34911/4-728.228.4(85%)27.81328.52413/8-630.831.0(85%)30.35331.11511/2-63434.2(85%)33.52834.29013/4-539.539.8(85%)38.96439.8272-445.245.3(90%)44.67945.593美制细牙螺纹(单位：mm)螺纹尺寸钻头直径2B级螺纹内螺纹小径下孔径最小直径最大直径NO.0-80UNF1.251.30(65%)1.1821.3051-721.551.61(65%)1.4741.6122-641.851.90(65%)1.7561.9123-562.12.17(70%)2.0252.1974-482.42.44(70%)2.2712.4585-442.72.74(70%)2.5512.7406-402.93.02(70%)2.8203.0228-363.53.59(75%)3.4043.60610-324.14.14(80%)3.9634.165
