标准公制螺纹基本牙型和公式

1、公制螺纹粗牙公制螺纹细牙公称尺寸 M螺距 P外径 D=d节径 D2=d2内径 D1=d1公称尺寸 M螺距 P外径 D=d节径 D2=d2内径 D1=d1M10.251.0000.8380.729M1.20.251.2001.0380.929M1.40.31.4001.2051.075M20.42.0001.7401.567M30.53.0002.6752.459M30.353.0002.7732.621M3.50.63.5003.1102.850M3.50.353.5003.2733.121M40.704.0003.5453.242M40.54.0003.6753.459M4.50.754.5

2、004.0133.688M4.50.54.5004.1753.959M50.85.0004.4804.134M50.55.0004.6754.459M616.0005.3504.917M60.756.0005.5135.188M81.258.0007.1886.647M818.0007.3506.917M101.510.0009.0268.376M101.2510.0009.1888.647M121.7512.00010.86310.106M121.512.00011.02610.376M14214.00012.70111.835M141.514.00013.02612.376M16216.0

3、0014.70113.835M161.516.00015.02614.376M182.518.00016.37615.294(M18)1.518.00017.02616.376M202.520.00018.37617.294M201.520.00019.02618.376M222.522.00020.37619.294(M22)222.00020.70119.835M24324.00022.05120.752M24224.00022.70121.835M27327.00025.05123.752M27226.00025.70124.835M303.530.00027.72726.211M282

4、28.00026.70125.835M333.533.00030.72729.211M30330.00028.05126.752M36436.00034.40231.670M33332.00031.05129.752M39439.00036.40234.670M36336.00034.05132.752M424.542.00039.07737.129M39338.00037.05135.752M454.545.00042.07740.129M40340.00038.05136.7522.标记示例 例1：伴通螺纹丨大径d=20螺!fP2（细牙）I顶径公芒带代号 中径公差带代号左旋M20L5LH-

5、5g6g-S*短旋合长度3.螺纹标记含义例1： M20L5 LH含义：公称直径为20,螺距为15的左旋单线细牙普通螺纹。公差代号用大写字母的螺纹为内螺纹; 反之，用小写字母的则为外螺纹。Tr迪強次ZR且刁苜迪坯次中径公差带代号为5g,顶径公差带代号为6g。说岀下列螺纹的标记螺纹公称直径 d螺距 P钻头直径 d铜不锈钢204161602517517530525250352152154073333053535508414205454561495075525281256667177075717210158485125868716970757172121751011021510410512510610

6、7110911142118121512412511291316213814151441451149151825153155215816151641651169172025173175217818151841851189192225193195219820152042051209212432072122182215224225122923非螺纹密封英制英制锥管螺纹英制锥螺纹螺纹直径牙数钻头直径螺纹直径牙数钻头直径螺纹直径牙数钻头直径1/828881/828841/827861/4191171/4191121/4181113/8191523/8191473/8181451/2141891/2141

7、831/2141793/4142443/4142363/41423211130611429711152921-1/4113921-1/4113831-1/41153791-3/8114161-1/2114411-1/21154391-1/211451211558211556螺距(t)螺纹长度基面上螺纹直径牙型高度 (h1)有效长度基面长度外径 (d)中径(d2)内径(d1)0.9194.59.739.158.570.581.3411613.1612.311.450.861.3412616.6615.8114.950.861.81157.520.9619.7918.631.161.81179.5

8、26.4425.2824.121.162.31191133.2531.7730.291.482.31221341.9140.4338.951.482.31231447.8146.3344.851.482.31261659.6258.1456.661.482.313018.575.1973.7172.231.482.313220.587.8986.4184.931.482.313825.5113.03111.56110.081.48本螺纹基面上各直径等于圆柱螺纹的各相应直径基面上螺纹内径 d1 = d - 1.28t3/4 = 26.44 - 1.28 * 1.81 = 24.12斜角（） 14

9、724 锥角 （2tg）=1:16公称直 径（英 寸）每英寸牙数 （n）螺距（t）管子外径（ d）管接头螺纹内径（ d1）牙型 高度 （h1）名义尺寸最大外径最小外径名义尺寸最大内径最小内径1/8280.919.739.689.388.578.928.670.581/4191.3413.1613.112.7411.4511.8411.560.863/8191.3416.6616.616.2414.9515.3515.060.861/2141.8120.9620.8920.518.6319.0518.751.165/8141.8122.9122.8522.4620.5921.0120.711.1

10、63/4141.8126.4426.3825.9724.1224.5724.251.167/8141.8130.230.1429.7327.8828.3328.011.161112.3133.2533.1832.7530.2930.7930.431.481-1/4112.3141.9141.8441.3638.9539.4639.11.481-3/8112.3144.3344.2643.7841.3741.8741.511.481-1/2112.3147.8147.7447.2144.8545.4451.481-3/4112.3153.7553.6753.1450.7951.3450.941.

11、482112.3159.6259.5459.0156.6657.2156.811.482-1/2112.3175.1975.1174.5472.2372.8372.391.483112.3187.8987.887.1984.9385.5885.11.48外径 d 由公称直径所决定螺纹内径 d1 = d - 1.28t斜角（） 14724 锥角 （2tg）=1:16公称直径(英寸)每英寸牙 数(n)螺距(t)螺纹长度基面上螺纹直径牙型高度(h1)有效长度基面长度外径(d)中径(d2)内径(d1)1/16270.946.54.067.97.146.390.751/8270.9474.5710.27

12、9.528.770.751/4181.419.55.0813.5712.4411.311.133/8181.4110.56.117.0615.9314.81.131/2141.8113.58.1321.2219.7718.321.453/4141.81148.6126.5725.1223.671.45111-1/22.2117.510.1633.2331.4629.691.771-1/411-1/22.211810.6741.9940.2238.451.771-1/211-1/22.2118.510.6748.0546.2944.521.77211-1/22.211911.0760.0958.

13、3356.561.77外径 d 由公称直径所决定牙型高度 h1=0.8t基面上螺纹内径 d1 = d - 1.6t3/8 = 17.06mmd1=17.06 - 1.6 * 1.41 = 14.80斜角（） 14724 锥角 （2tg）=1:16直径每寸牙数螺距(t)外螺纹外径内螺纹内径选用名义尺寸最大尺寸最小尺寸名义尺寸最大尺寸最小尺寸6241.064.634.54.243.563.973.71201.276.26.055.754.915.395.16181.417.787.627.316.346.866.55161.599.369.28.97.738.297.976141.8110.931

14、0.7510.459.069.679.33122.1212.512.311.910.310.9610.6116122.1214.0813.8713.4711.8912.5612.21112.3115.6515.4315.0313.2613.9413.61102.5418.8118.5718.1716.1716.9216.54192.8221.9621.721.219.0319.8219.45183.1825.1124.8224.3221.822.6722.27873.6328.2527.9327.3324.4625.4324.99473.6331.4331.0930.4927.6428.592

15、8.18864.2334.5634.233.630.1331.2330.76264.2337.7337.3636.7633.3134.3833.94455.0844.0243.5942.7938.739.9539.4584.55.6447.1546.6845.8841.2342.5842.064.55.6450.3249.8449.0444.4145.7945.25内螺纹（ d）公称直径3/4=19.05 mm外螺纹（ d1） 内径 d-1.28 t3/4=19.05 -1.28 * 2.54=15.79 mm外螺纹（ d1） 内径 d-1.134 t3/4=19.05 -1.134 * 2.

16、54=16.16 mm公称直径（英寸）每英寸牙数（n）螺 距 (t)外螺纹外径内螺纹内径名义尺寸名义尺寸d =d-0.075t-0.0511/16141.81417.2815.43/8201.279.388.087/8112.312219.65/8141.8115.6913.823/4122.1218.8416.651/4260.9766.235.241/2161.58712.5310.91102.5425.1522.52内螺纹 d（公称直径）外螺纹 d1=内径 =d-1.28t 3/4=19.05-1.28*2.116=16.34内螺纹 d1=内径 =d-1.134t 3/4 =19.05-

17、1.134*2.116=16.653/4=12 牙/英寸t=2.116标准统一标准螺纹基本牙型和公式公称尺寸外径D=d节径D2=d2内径D1=d1公称尺寸外径D=d节径D2=d2内径D1=d1粗牙 UNC细牙 UNF粗牙 UNC细牙UNF#0-801.5241.3181.1817/16-14-11.1129.9349.149#1-64-1.8541.5981.4257/16-2011.11210.2879.738#1-721.8541.6261.4732/1-13-12.70011.43010.584#2-56-2.1841.8901.6942/1-2012.70011.87411.326#2

18、-642.1841.9281.7559/16-12-14.28812.91311.996#3-48-2.5152.1721.9419/16-1814.28813.37112.761#3-562.5152.2202.0245/8-11-15.87514.37613.376#4-40-2.8452.4332.1565/8-1815.87514.95814.348#4-482.8452.5022.2713/4-10-19.05017.39916.299#5-40-3.1752.7642.4873/4-1619.05018.01917.330#5-443.1752.7092.5517/8-9-22.22520.39119.169#6-32-3.5052.9902.6477/8-1422.22521.04620.262#6-403.5053.0942.817#8-32-4.1663.6503.3071-8-25.40023.33821.963#8-364.1663.7083.4011-1225.40024.02623.109#10-24-4.8264.1383.6801 1/8-7-28.57526.21824.648#10324.8264.3103.9671 1/8-1228.5752