1标准公制螺纹基本牙型和公式解析

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=d1M10.251.0000.8380.729M1.20.251.2001.0380.929M1.40.31.4001.2051.075M20.42.0001.7401.567M30.53.0002.6752.459M30.353.0002.7732.621M3.50.63.5003.1102.850M3.50.353.5003.2733.121M40.704.0003.5453.242M40.54.0003.6753.459M4.50.754.5004.0133.6

2、88M4.50.54.5004.1753.959M50.85.0004.4804.134M50.55.0004.6754.459M616.0005.3504.917M60.756.0005.5135.188M81.258.0007.1886.647M818.0007.3506.917M101.510.0009.0268.376M101.2510.0009.1888.647M121.7512.00010.86310.106M121.512.00011.02610.376M14214.00012.70111.835M141.514.00013.02612.376M16216.00014.70113

3、.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)222.00020.70119.835M24324.00022.05120.752M24224.00022.70121.835M27327.00025.05123.752M27226.00025.70124.835M303.530.00027.72726.211M28228.00026.7

4、0125.835M333.533.00030.72729.211M30330.00028.05126.752M36436.00034.40231.670M33332.00031.05129.752M39439.00036.40234.670M36336.00034.05132.752M424.542.00039.07737.129M39338.00037.05135.752M454.545.00042.07740.129M40340.00038.05136.752p标准公制螺纹基本牙型和公式§§PnIt p11 = 0,8660?Hl = 05412 PDd:D2d2 =

5、(dO.6495 P)Dl=dl=(cl-l.OS25P)2.标记示例 例1：普通螺纹丨M2«XL5LH-5g6g-S'*短旋合长度人径d=2U螺gpP2（细牙）I顶径公左带代号 中径公羞带代号左旋3.螺纹标记含义例 1： M20X1.5 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。育陋烁汉ZHU刁苜池烁汉中径公差带代号为5g,顶径公差带代号为6g。说出下列螺纹的标记J.:眇7 农诂01 ” 茫曲gm： i5g4标注方法M20X2'/XZ/,1 -.=Z / 7 / 7 /./)内螺纹%

6、|丄加“S第寻7773® 怦脅瑟护：M20-7HQ寸界线应从何W； i尺寸界线应从大径引出! -r pF螺纹公称直径d螺距P钻头直径d铜不锈钢20. 41. 61. 60. 251. 751. 7530. 52. 52. 50. 352. 152. 1540. 73. 33. 30. 53. 53. 550. 84. 14. 20. 54. 54. 5614. 950. 755. 25. 281. 256. 66. 71770. 757. 17. 2101. 58. 48. 51. 258. 68. 716. 970. 757. 17. 2121. 7510. 110. 21. 51

7、0. 410. 51. 2510. 610. 7110. 91114211. 8121. 512. 412. 5112. 91316213. 8141. 514. 414. 5114. 915182. 515. 315. 5215. 8161. 516. 416. 5116. 917202. 517. 317. 5217. 8181. 518. 418. 5118. 919222. 519. 319. 5219. 8201. 520. 420. 5120. 92124320. 721221. 8221. 522. 422. 5122. 923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

8、直径螺纹直径牙数钻头直径螺纹直径牙数钻头直径1/8288. 81/8288. 41/8278. 61/41911. 71/41911. 21/41811. 13/81915. 23/81914. 73/81814. 51/21418. 91/21418. 31/21417. 93/41424. 43/41423. 63/41423. 211130. 611429. 7111. 529. 21-1/41139. 21-1/41138. 31-1/411. 537. 91-3/81141. 61-1/21144. 11-1/211. 543. 91-1/21145. 121155. 8211. 5

9、56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)0.9194.59.739.158.570.581.3411613.1612.311.450.861.3412616.6615.8114.950.861.81157.520.9619.7918.631.161.81179.526.4425.2824.121.162.31191133.2531.7730.291.482.31221341.9140.4338.951.482.31231447.8146.3344.851.482.31261659.6258.1456.661.482.313018.5

10、75.1973.7172.231.482.313220.587.8986.4184.931.482.313825.5113.03111.56110.081.48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（©） 1°7'24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 咼度(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1/8280.919.739.68

11、9.388.578.928.670.581/4191.3413.1613.112.7411.4511.8411.560.863/8191.3416.6616.616.2414.9515.3515.060.861/2141.8120.9620.8920.518.6319.0518.751.165/8141.8122.9122.8522.4620.5921.0120.711.163/4141.8126.4426.3825.9724.1224.5724.251.167/8141.8130.230.1429.7327.8828.3328.011.161112.3133.2533.1832.7530.2

12、930.7930.431.481-1/4112.3141.9141.8441.3638.9539.4639.11.481-3/8112.3144.3344.2643.7841.3741.8741.511.481-1/2112.3147.8147.7447.2144.8545.4451.481-3/4112.3153.7553.6753.1450.7951.3450.941.482112.3159.6259.5459.0156.6657.2156.811.482-1/2112.3175.1975.1174.5472.2372.8372.391.483112.3187.8987.887.1984.

13、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（©） 1°7'24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)1/16270.946.54.067.97.146.390.751/8270.9474.5710.279.528.770.751/4181.419.55.0813.5712.4411.311.133/8181.4110.56.117.0615.9314.81.131/2141.8113.5

14、8.1321.2219.7718.321.453/4141.81148.6126.5725.1223.671.45111-1/22.2117.510.1633.2331.4629.691.771-1/411-1/22.211810.6741.9940.2238.451.771-1/211-1/22.2118.510.6748.0546.2944.521.77211-1/22.211911.0760.0958.3356.561.77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 = 14.8

15、0斜角（©） 1°7'24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6241.064.634.54.243.563.973.71n201.276.26.055.754.915.395.16181.417.787.627.316.346.866.55n161.599.369.28.97.738.297.976141.8110.9310.7510.459.069.679.33n122.1212.512.311.910.310.9610.6116122.1214.0813.8713

16、.4711.8912.5612.21n112.3115.6515.4315.0313.2613.9413.61n102.5418.8118.5718.1716.1716.9216.541n92.8221.9621.721.219.0319.8219.451n83.1825.1124.8224.3221.822.6722.27873.6328.2527.9327.3324.4625.4324.99473.6331.4331.0930.4927.6428.5928.18864.2334.5634.233.630.1331.2330.76264.2337.7337.3636.7633.3134.38

17、33.94455.0844.0243.5942.7938.739.9539.4584.55.6447.1546.6845.8841.2342.5842.06n4.55.6450.3249.8449.0444.4145.7945.25内螺纹(d/)公称直径3/4 =19.05 mm外螺纹（d1） 内径 d/ -1.28 t 3/4 =19.05 -1.28 * 2.54=15.79 mm外螺纹（d1/） 内径 d/ -1.134 t 3/4 =19.05 -1.134 * 2.54=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'-

18、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 =19.05-1.134*2.116=16.653/4 =12 牙/英寸t=2.116标准统一标准螺

19、纹基本牙型和公式nIII IpglJIN :每254長牙數P = 25.4/NH 二(W)PHl = 0.5412 PD = d:外徑或大徑D2 二 d2 = (d-a6495P)Dl=dl=(d-L0325P)公称尺寸粗牙UNC细牙UNF外径D=d节径D2=d2内径D1=d1公称尺寸粗牙UNC细牙UNF外径D=d节径D2=d2内径D1=d1#0-801.5241.3181.1817/16-1411.1129.9349.149#1-641.8541.5981.4257/16-2011.11210.2879.738#1-721.8541.6261.4732/1-1312.70011.43010.584#2-562.1841.8901.6942/1-2012.70011.87411.326#2-642.1841.9281.7559/16-1214.28812.91311.996#3-482.5152.1721.9419/16-1814.28813.37112.761#3-562.5152.2202.0245/8-1115.87514.37613.376#4-402.8452.4332.1565/8-1815.87514.95814