各类螺纹底孔的设计尺寸

1、各类螺纹底孔的设计尺寸公制粗牙螺纹 JISB0209-1982（单位：mm）螺纹尺寸钻头直径崁合度区分：中（注1）2级（注2） 下孔径崁合度区分：中（注1）2级（注2）内螺纹小径最小直径最大直径M1X 0.250.750.78(80%)0.7290.7851.1 X 0.250.850.88(80%)0.8290.8851.2 X 0.250.950.98(80%)0.9290.9851.4 X 0.31.11.14(80%)1.0751.1421.6 X 0.351.251.32(75%)1.2211.3211.8 X 0.351.451.52(75%)1.4211.5212 X 0.41.

2、61.65(80%)1.5671.6792.2 X 0.451.751.83(75%)1.7131.8382.5 X 0.452.12.13(75%)2.0132.1383 X 0.52.52.59(75%)2.4592.5993.5 X 0.62.93.01(75%)2.8503.0104 X 0.73.33.39(80%)3.2423.4224.5 X 0.753.83.85(80%)3.6883.8785 X 0.84.24.31(80%)4.1344.3346 X 155.13(80%)4.9175.1537 X 166.13(80%)5.9176.1538 X 1.256.86.85

3、(85%)6.6476.9129 X 1.257.87.85(85%)7.6477.91210X 1.58.58.62(85%)8.3768.67611X 1.59.59.62(85%)9.3769.67612X 1.7510.310.40(85%)10.10610.44114X 21212.2(85%)11.83512.21016X 21414.2(85%)13.83514.21018X 2.515.515.7(85%)15.29415.74420X 2.517.517.7(85%)17.29417.74422X 2.519.519.2(85%)19.29419.74424 X 32121.

4、2(85%)20.75221.25227 X 32424.2(85%)23.75224.25230X 3.526.526.6(90%)26.21126.77133X 3.529.529.6(90%)29.21129.77136 X 43232.1(90%)31.67032.27039 X 43535.1(90%)34.67035.27042X 4.537.537.6(90%)37.12937.79945X 4.540.540.6(90%)40.12940.79948 X 54343.1(90%)42.58743.297注（1）M1.4以下等级：5H、M1.6以上等级：6H（2）基于 JISB0

5、209-1982 标准公制细牙螺纹 JISB0211-1982（单位：mm）螺纹尺寸钻头直径崁合度区分：中（注1）2级（注2） 下孔径崁合度区分：中（注1）2级（注2）内螺纹小径最小直径最大直径M26X 1.524.524.62(85%)24.37624.67627 X 22525.2(85%)24.83525.21027X 1.525.525.62(85%)25.37625.67627 X 12626.13(80%)25.91726.15328 X 22626.2(85%)25.83526.21028X 1.526.526.62(85%)26.37626.67628 X 12727.13(8

6、0%)26.91727.15330 X 32727.2(85%)26.75227.25230 X 22828.2(85%)27.83528.21030 X 1.528.528.62(85%)28.37628.67630 X 12929.13(80%)28.91729.15332 X 23030.2(85%)29.83530.21032 X 1.530.530.62(85%)30.37630.67633 X 33030.2(85%)29.75230.25233 X 23131.2(85%)30.83531.21033 X 1.531.531.62(85%)31.37631.67635 X 1.5

7、33.533.62(85%)33.37633.67636 X 33333.2(85%)32.75233.25236 X 23434.2(85%)33.83534.21036 X 1.534.534.62(85%)34.37634.67638 X 1.536.536.62(85%)36.37636.67639 X 33636.2(85%)35.75236.25239 X 23737.2(85%)36.83537.21039 X 1.537.537.62(85%)37.37637.67640 X 33737.2(85%)36.75237.25240 X 23838.2(85%)37.83538.2

8、1040 X 1.538.538.62(85%)38.37638.67642 X 43838.1(90%)37.67038.27042 X 33939.2(85%)38.75239.25242 X 24040.2(85%)39.83540.21042 X 1.540.540.62(85%)40.37640.67645 X 44141.1(90%)40.67041.27045 X 34242.2(85%)41.75242.25245 X 24343.2(85%)42.83543.21045 X 1.543.543.62(85%)43.37643.67648 X 44444.1(90%)43.67

9、044.27048 X 34545.2(85%)44.75245.25248 X 24646.2(85%)45.83546.21048 X 1.546.546.62(85%)46.37646.67650 X 34747.2(85%)46.75247.25250 X 24848.2(85%)47.83548.21050 X 1.548.548.62(85%)48.37648.676注等级：6H（2）基于 JISB0211-1982 标准美制粗牙螺纹（单位：mm）螺纹尺寸钻头直径2B级螺纹下孔径内螺纹最小直径（小径最大直径NO.1-64UNC1.551.57(65%)1.4251.5822-561

10、.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%)4.3444.5971/4-205.15.25(80%)4.9795.2575/16-186.66.72(80%)6.4016.7313/8-1688.15(80%)7.7988.1537/16-149.49.

11、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(85%)24.63825.34911/4-728.228.4(85%)27.81328.52413/8-630.831.0(85%)30.35331.11511/2-6343

12、4.2(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

13、%)2.8203.0228-363.53.59(75%)3.4043.60610-324.14.14(80%)3.9634.16512-284.64.70(80%)4.4964.7241/4-285.55.56(80%)5.3605.5885/16-246.97.02(80%)6.7827.0353/8-248.58.61(80%)8.3828.6367/16-209.910.01(80%)9.72910.0331/2-2011.511.60(80%)11.32911.6079/16-1812.913.07(80%)12.75113.0815/8-1814.514.65(80%)14.3511

14、4.6813/4-1617.517.59(85%)17.32317.6787/8-1420.520.6(85%)20.27020.6751-1223.223.5(85%)23.11423.57111/8-1226.526.7(80%)26.28926.74611/4-1229.529.9(80%)29.46429.92113/8-1232.833.0(85%)32.63933.09611/2-123636.2(85%)35.81436.271缝纫机螺纹（SM）（单位：mm）螺纹尺寸钻头直径2B级螺纹 下孔径2级内螺纹小径最小直径最大直径SM1/16-801.251.28(75%)1.2111.

15、2815/64-641.551.57(80%)1.5131.5933/32-1002.102.15(70%)2.0812.1563/32-561.851.91(80%)1.8411.9361/8-442.502.58(80%)2.4852.6051/8-402.452.52(80%)2.4212.5519/64-402.852.91(80%)2.8182.94811/64-403.653.71(80%)3.6123.7423/16-323.903.94(80%)3.8203.9803/16-283.703.82(80%)3.6843.8447/32-324.704.73(80%)4.6144.

16、77415/64-284.905.01(80%)4.8755.0551/4-405.605.69(80%)5.5965.7261/4-285.305.41(80%)5.2725.452缝纫机螺纹（SM）（单位：mm）螺纹尺寸钻头直径2B级螺纹 下孔径2级内螺纹小径最小直径最大直径SM1/4-245.105.25(80%)5.0865.2669/32-286.106.20(80%)6.0666.2569/32-205.705.82(80%)5.6345.8245/16-286.906.00(80%)6.8607.0505/16-246.706.84(80%)6.6746.8645/16-186.

17、306.38(85%)6.2546.4443/8-288.508.58(80%)8.4478.6373/8-187.907.97(85%)7.8438.0537/16-2810.1010.17(80%)10.03410.2247/16-169.309.36(85%)9.2209.4401/2-2811.7011.76(80%)11.62211.8121/2-2011.3011.38(80%)11.19011.4101/2-1210.3010.36(85%)10.18010.420英制粗牙螺纹（单位：mm）螺纹尺寸下孔径嵌合率A列（硬材质）B列（软材质）A列直径B列直径内螺纹最小径内螺纹最大径W

18、1/82.62.570.783.070.088.33/163.73.678.485.870.088.31/45.15.076.983.070.588.35/166.66.574.099.570.188.43/88.07.975.080.069.588.27/169.49.373.780.069.088.81/210.710.573.881.269.088.29/1612.312.073.484.469.088.25/813.713.573.580.369.688.53/416.716.572.378.469.688.37/819.519.375.480.970.188.4122.422.073

19、.883.671.088.211/825.024.876.981.372.088.411/428.328.074.380.772.088.413/830.530.381.685.373.888.611/233.833.579.384.873.888.615/836.035.781.185.774.888.313/439.239.080.783.874.888.317/841.841.580.684.774.788.4245.044.780.284.474.788.4英制管用螺纹(单位：mm)管用螺纹尺寸JISB0203JISB2301锥管内螺纹 Rc(PT)平行内螺纹Rp(PS)锥管内螺纹计算

20、值下孔径计算值下孔径计算值下孔径1/166.2306.26.4906.5一一1/88.2358.28.4958.58.1918.21/410.94110.911.34111.410.94510.93/814.42814.414.84614.914.38814.41/217.9501818.48918.517.943183/423.3492323.9752423.30523129.4232930.1113029.3532911/437.9403838.7723937.8903811/243.8334444.5654543.72043255.4125556.4765655.4065521/270.

21、7017172.0097270.78870383.2018384.7098583.3648331/295.5479697.1559795.747954107.834108109.855110108.3221085133.110133135.255135133.5971336158.510159160.655161158.8101587183.360183185.9541868208.560209211.3542129233.960234236.75423710259.166259262747310312.875313英制平行管用螺纹 PF(G)(单位：mm)螺纹下孔径

22、内螺纹小径(参考)尺寸大径标准嵌合高度H系列1009590858075706560最小直 径最大直 径G1/167.7230.58086.566.626.686.746.796.856.916.977.036.8436.561G(PF)1/89.7288.578.628.688.748.808.868.928.979.038.8488.5661/413.1570.856011.5311.6211.7011.7911.8711.9612.0412.1311.89011.4453/816.66214.9515.0415.1215.2115.2915.3815.4615.5515.6415.3951

23、4.9501/220.9551.161818.818.919.019.119.219.319.419.619.17218.6315/822.911ft20.620.720.820.921.021.221.321.421.521.13020.5893/426.44124.224.424.524.624.724.824.925.024.65824.1177/830.201ft27.928.028.128.228.338.528.628.728.828.41827.877133.24914.78630.330.430.630.730.931.031.231.331.530.93130.29111/8

24、37.897ft35.135.235.435.535.735.835.936.535.57934.93911/441.91039.039.139.239.439.639.739.840.040.139.59238.95213/844.323ft41.441.541.741.842.042.142.242.442.642.00541.36511/247.80345.045.145.345.445.645.745.946.045.48549.02315/851.910ft49.249.349.549.649.849.950.050.249.67250.78813/453.74650.850.951

25、.151.251.451.551.752.052.051.42856.656259.614ft56.857.057.157.257.457.557.857.857.296使用粗线左侧数据作为攻丝前的底孔直径，可加工符合JISB0202的A级或B级的内螺纹小径。美制斜行管用螺纹(NPT? NPSX单位：mm)管用螺纹尺寸斜行螺纹(NPT)平行螺纹(NPS)钻头直径钻头直径使用铰刀场合不使用铰刀场合1/16一0.234(5.94)0.246(6.15)1/40.250(6.35)1/821/640.328(8.33)一0.332(8.43)11/320.344(8.74)1/427/640.422

26、(10.72)7/160.438(11.13)7/160.438(11.13)3/89/160.562(14.27)9/160.562(14.27)37/640.578(14.68)1/211/160.688(17.48)45/640.703(17.86)23/320.719(18.26)3/457/640.891(22.63)29/320.906(23.01)59/640.922(23.42)111/81.125(28.58)19/641.141(28.98)15/321.156(29.36)11/4115/321.469(37.31)131/641.484(37.69)11/21.500(

27、38.10)11/211/161.703(43.26)123/321.719(43.66)13/41.750(44.45)2211/642.172(55.17)23/162.188(55.58)27/322.219(56.36)21/2239/642.578(65.48)239/642.609(66.27)221/322.656(67.46)上述钻头直径来源于美制管用螺纹ANSI/ ASMEB1.20.1 1983PipeThreads,Ge neralPurpose(l nch) 标准螺纹下孔径表美制管用耐密斜行螺纹 (NPTF? NPSF)(单位：mm)管用螺纹尺寸斜行螺纹(NPTF)平行

28、螺纹(NPSF)钻头直径钻头直径使用铰刀场合不使用铰刀场合1/16一0.234(5.94)0.246(6.25)1/40.250(6.35)1/821/640.328(8.33)一0.339(8.61)11/320.344(8.74)1/427/640.422(10.72)7/160.438(11.13)一0.444(11.28)3/89/160.562(14.27)37/640.578(14.68)37/640.578(14.68)1/211/160.688(17.48)45/640.703(17.86)23/320.719(18.26)3/457/640.891(22.63)59/640.

29、922(23.42)一0.922(23.42)111/81.125(28.58)15/321.156(29.36)15/321.156(29.36)11/4115/321.469(37.31)11/21.500(38.10)一一11/2145/641.703(43.26)147/641.734(44.04)一一223/162.188(55.58)27/322.219(56.36)一一21/2219/322.594(65.89)241/642.641(67.08)一一上述钻头直径来源于美制管用耐密斜行螺纹ANSIB1.20.3 1957DrysealPipeThreads（l nch）标准螺纹下

30、孔径表（无屑丝攻用）公制螺纹（NRT）（单位：mm）螺纹尺寸1级螺纹用下孔径2级螺纹用下孔径RH精度取小取大 （嵌合率）RH精度取小取大 （嵌合率 ）M1X 0.2520.870.89(10085)40.900.92(10080)1.1 X 0.2520.970.99(10085)41.001.02(10080)1.2 X 0.2521.071.09(10085)41.101.12(10080)1.4 X 0.321.2441.263(10085)41.2701.294(10080)1.7 X 0.3521.511.54(10080)41.541.58(10075)2X 0.421.781.8

31、2(10080)41.811.85(10075)2.3 X 0.422.082.12(10080)42.112.15(10075)2.5 X 0.4522.252.29(10080)42.282.33(10075)2.6 X 0.4522.352.39(10080)42.382.43(10075)3X 0.532.742.78(10080)52.762.81(10075)3.5 X 0.633.183.21(10085)53.203.26(10075)4X 0.743.633.67(10085)63.653.70(10085)5X 0.844.574.62(10085)64.594.66(10

32、080)6 X 145.455.51(10085)75.485.57(10080)7 X 146.456.51(10085)76.486.57(10080)8 X 1.2557.317.38(10085)77.347.41(10085)8 X 147.457.51(10085)77.487.57(10080)10X 1.559.169.22(10090)79.189.28(10085)10X 1.2559.319.38(10085)79.349.41(10085)10X 159.469.52(10085)79.489.57(10080)12X 1.75511.0111.08(10090)811

33、.0511.15(10085)12X 1.5511.1611.22(10090)711.1811.28(10085)12X 1.25511.3111.38(10085)711.3411.41(10085)12X 1511.4611.52(10085)711.4811.57(10080)14X 2612.8312.95(10090)1012.9213.04(10085)14X 1.5513.1613.22(10090)913.2113.30(10085)16X 2614.8714.95(10090)1014.9215.04(10085)16X 1.5515.1615.22(10090)915.2

34、115.30(10080)18X 2.5616.5716.67(10090)1116.6316.78(10085)18X 1.5617.1717.23(10090)1017.2217.31(10085)20 X 2.5618.5718.67(10090)1118.6318.78(10085)20 X 1.5619.1719.23(10090)1019.2219.31(10085)螺纹下孔径表（无屑丝攻用）美制粗牙螺纹（NRT）（单位：mm）螺纹尺寸2B级螺纹用下孔径3B级螺纹用下孔径RH精度取小取大 （嵌合率 ）RH精度取小取大 （嵌合率 ）NO.2-56UNC41.962.02(10065)

35、31.952.01(10065)3-4842.252.32(10065)32.232.31(10065)4-4052.522.60(10070)32.502.58(10070)5-4052.862.93(10070)32.832.91(10070)6-3253.093.17(10075)33.063.14(10075)8-3263.753.83(10075)43.743.82(10075)10-2464.264.35(10080)44.244.32(10080)12-2464.925.01(10080)44.904.96(10085)1/4-2065.665.76(10080)45.645.7

36、4(10080)5/16-1877.187.29(10080)57.157.24(10085)3/8-1678.668.78(10080)58.638.73(10085)7/16-14710.1110.25(10080)510.0810.19(10085)1/2-13810.6211.78(10080)611.6011.68(10090)9/16-121013.1413.27(10085)813.1113.24(10085)5/8-111114.6214.76(10085)814.5814.67(10090)3/4-101217.6717.88(10080)917.6317.74(10090)

37、7/8-91220.6820.85(10085)920.6420.75(10090)1-81323.6523.84(10085)1023.6123.74(10090)螺纹下孔径表（无屑丝攻用）美制细牙螺纹（NRT）（单位：mm）螺纹尺寸2B级螺纹用下孔径3B级螺纹用下孔径RH精度取小取大 （嵌合率 ）RH精度取小取大 （嵌合率）NO.2-64UNF31.982.04(10065)21.972.03(10065)3-5642.292.35(10065)32.282.34(10065)4-4842.572.64(10070)32.562.63(10070)5-4442.882.95(10070)3

38、2.872.94(10070)6-4053.193.26(10070)33.163.22(10075)8-3653.803.88(10075)43.793.86(10075)10-3254.414.48(10080)44.404.46(10080)12-2855.005.08(10080)44.995.06(10080)1/4-2855.865.93(10080)45.855.92(10080)5/16-2467.387.46(10080)57.367.43(10085)3/8-2468.969.05(10080)58.959.02(10085)7/16-20710.4410.54(10080

39、)510.4110.49(10085)1/2-20712.0212.12(10080)512.0012.05(10090)9/16-18913.5513.66(10080)713.5313.58(10090)5/8-18915.1415.25(10080)715.1115.17(10090)3/4-161018.2218.32(10085)718.1818.25(10090)7/8-141121.2721.38(10085)821.2321.27(10095)1-121224.2824.41(10085)924.2424.32(10090)英制管用平行螺纹（NRT）（单位：mm）螺纹尺寸RH精

40、度取小取大（嵌合率 ）PF1/869.249.35(10080)1/4712.4112.62(10075)3/8715.9216.12(10075)1/2819.9320.15(10080)3/4825.4125.64(10080)螺纹下孔径表（无屑丝攻用） 公制螺纹（HRT）（单位：mm）螺纹尺寸1级螺纹用下孔径2级螺纹用下孔径RH精度取小取大 （嵌合率 ）RH精度取小取大 （嵌合率）M1X 0.2520.8580.879(10085)40.8580.887(10080)1.2 X 0.2521.0581.079(10085)41.0581.087(10080)1.4 X 0.321.231

41、.26(10085)41.231.26(10080)1.6 X 0.3521.401.44(10080)41.401.45(10075)1.7 X 0.35一1.501.54(10080)41.501.55(10075)1.8 X 0.3521.601.64(10080)41.601.65(10075)2 X 0.421.771.82(10080)41.771.82(10080)2 X 0.2521.8581.887(10080)一1.8581.887(10080)2.3 X 0.4一2.072.12(10080)42.072.13(10075)2.5 X 0.4532.242.30(1008

42、0)52.242.31(10075)2.6 X 0.45一2.342.40(10080)52.342.41(10075)3 X 0.632.722.73(10090)52.662.73(10090)3 X 0.552.722.77(10080)62.722.78(10075)3 X 0.3532.802.84(10080)52.802.85(10075)3.5 X 0.633.163.21(10085)53.163.25(10075)4 X 0.7533.573.64(10085)63.573.64(10085)4 X 0.763.603.66(10085)73.603.66(10085)4

43、X 0.533.713.77(10080)63.713.79(10075)5 X 0.934.494.59(10085)74.494.59(10085)5 X 0.834.554.62(10085)84.554.64(10080)5 X 0.532.724.77(10080)64.724.79(10075)6X 145.435.52(10085)75.435.55(10080)6 X 0.7535.575.64(10085)75.575.66(10080)螺纹下孔径表（护套螺纹用）公制粗牙螺纹 HL-NRT（单位：mm）螺纹尺寸RH精度取小取大（嵌合率 ）M3X 0.533.393.43(10080)4 X 0.744.544.58(10085)5 X 0.845.615.66(10085)6X 146.756.81(10085