標準公制螺紋基本牙型和公式

1、王/H = 0,8660 PHl = 0+5412 PD = d:D2 = d2 = (d-0.6495P)Dl = dI = (d-LO825P)公制螺紋粗牙公制螺紋細牙公稱尺寸M螺距P外徑D=d節(jié)徑D2=d2內徑D1=d1公稱尺寸M1螺距P外徑D=d節(jié)徑D2=d2內徑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.

2、5003.2733.121M40.704.0003.5453.242M40.54.0003.6753.459M4.50.754.5004.0133.688M4.50.54.5004.1753.959M50.85.0004.4804.134M50.55.0004.6754.459M616.0005.3504.917M60.756.0005.5135.188M81.258.0007.1886.647M818.0007.3506.917M101.510.0009.0268.376M101.2510.0009.1888.647M121.7512.00010.86310.106M121.512.0001

3、1.02610.376M14214.00012.70111.835M141.514.00013.02612.376M16216.00014.70113.835M161.516.00015.02614.376M182.518.00016.37615.294(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.

4、00025.05123.752M27226.00025.70124.835M303.530.00027.72726.211M28228.00026.70125.835M333.533.00030.72729.211M30330.00028.05126.752M36436.00034.40231.670M33332.00031.05129.752M39439.00036.40234.670M36336.00034.05132.752M424.542.00039.07737.129M39338.00037.05135.752M454.545.00042.07740.129M40340.00038.

5、05136.7522.標記示例例 1：M20X1.5 LH-5g6g-S普通螺紋|短旋合長度大徑d = 20頂徑公差帶代號螺距P2（細牙）中徑公差帶代號左旋工螺紋標記含義例 1: M20XL5 LH含義;公稱直徑為20,螺距為L5的左旋單線細牙普通螺紋.公差代號用大寫字母的螺紋為內螺紋; 反之，用小寫字母的則為外螺紋.rr也爆雙為祖才rr皿麻狄小人： & 啊目仇/y川，n皿干th內 口 皿力 網5Kq -中徑公差帶代號為5g,頂徑公差帶代號為6班說出下列螺紋的標記4.標注方法M20-7H內螺紋H / / /，/管螺紋寸界線應從何尺寸界線應 從大徑引出!，單螺紋公稱直徑d螺距P鉆頭直徑d銅不銹鋼

6、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. 510. 410. 51. 2510. 610. 7110. 91114211. 8121. 512. 412. 5112. 91316213. 8141.

7、 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非螺紋密封英制英制錐管螺紋英制錐螺紋螺紋直徑牙數(shù)鉆頭直徑螺紋直徑牙數(shù)鉆頭直徑螺紋直徑牙數(shù)鉆頭直徑1/8288. 81/8288. 41/8278. 61/41911. 71/41911. 21/41811

8、. 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. 556螺距螺紋長度基面上螺紋直徑牙型高度(h1)后效長度基面長度外徑(d)中徑(d2)內徑(d1)0.9194.59.739.158.570.581.34

9、11613.1612.311.450.861.3412616.6615.8114.950.861.81157.520.9619.7918.631.161.81179.526.4425.2824.121.162.31191133.2531.7730.291.482.31221341.9140.4338.951.482.31231447.8146.3344.851.482.31261659.6258.1456.661.482.313018.575.1973.7172.231.482.313220.587.8986.4184.931.482.313825.5113.03111.56110.081.4

10、8本螺紋基面上各直徑等于圓柱螺紋的各相應直徑基面上螺紋內徑 d1 = d - 1.28t3/4 = 26.44 - 1.28 * 1.81 = 24.12斜角（4）1 4724 錐角 （2tg ?。?1:16公稱直 徑（英 寸）每英寸 牙數(shù)（n）螺距（t）管子外徑（d）管接頭螺紋內徑（d1）牙型 高度（h1）名義尺 寸最大外徑最小外徑名義尺 寸最大內徑最小內徑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.

11、861/2141.8120.9620.8920.518.6319.0518.751.165/8141.8122.9122.8522.4620.5921.0120.711.163/4141.8126.4426.3825.9724.1224.5724.251.167/8141.8130.230.1429.7327.8828.3328.011.161112.3133.2533.1832.7530.2930.7930.431.481-1/4112.3141.9141.8441.3638.9539.4639.11.481-3/8112.3144.3344.2643.7841.3741.8741.511.

12、481-1/2112.3147.8147.7447.2144.8545.4451.481-3/4112.3153.7553.6753.1450.7951.3450.941.482112.3159.6259.5459.0156.6657.2156.811.482-1/2112.3175.1975.1174.5472.2372.8372.391.483112.3187.8987.887.1984.9385.5885.11.48外徑d由公稱直徑所決定螺紋內徑di = d - 1.28t斜角（）1 4724 錐角 （2tg ?。?1:16公稱直徑 (英寸)每英寸牙數(shù)(n)螺距(t)螺紋長度基面上螺紋直

13、徑牙型高度(h1)后效長度基面長度外徑(d)中徑(d2)內徑(d1)1/16270.946.54.067.97.146.390.751/8270.9474.5710.279.528.770.751/4181.419.55.0813.5712.4411.311.133/8181.4110.56.117.0615.9314.81.131/2141.8113.58.1321.2219.7718.321.453/4141.81148.6126.5725.1223.671.45111-1/22.2117.510.1633.2331.4629.691.771-1/411-1/22.211810.6741.

14、9940.2238.451.771-1/211-1/22.2118.510.6748.0546.2944.521.77211-1/22.211911.0760.0958.3356.561.77外徑d由公稱直徑所決定牙型高度h1=0.8t基面上螺紋內徑di = d - 1.6t3/8 = 17.06mm di=17.06 - 1.6 * 1.41 = 14.80斜角(4)1 4724 錐角 (2tg 小)=1:16直徑每寸牙數(shù)螺距外螺紋外徑內螺紋內徑選用名義尺寸最大尺寸最小尺寸名義尺寸最大尺寸最小尺寸6241.064.634.54.243.563.973.714201.276.26.055.75

15、4.915.395.16181.417.787.627.316.346.866.558161.599.369.28.97.738.297.976141.8110.9310.7510.459.069.679.332122.1212.512.311.910.310.9610.616122.1214.0813.8713.4711.8912.5612.28112.3115.6515.4315.0313.2613.9413.64102.5418.8118.5718.1716.1716.9216.54892.8221.9621.721.219.0319.8219.4583.1825.1124.8224.3

16、221.822.6722.279/873.6328.2527.9327.3324.4625.4324.99/473.6331.4331.0930.4927.6428.5928.18/864.2334.5634.233.630.1331.2330.76/264.2337.7337.3636.7633.3134.3833.94/455.0844.0243.5942.7938.739.9539.45/84.55.6447.1546.6845.8841.2342.5842.064.55.6450.3249.8449.0444.4145.7945.25外螺紋（di） 內徑d，-1.28 t 3/4=19

17、.05 -1.28 * 2.54=15.79 mm內螺紋（d，）公稱直徑 3/4 =19.05 mm=19.05 -1.134 * 2.54=16.16 mm外螺紋（di ）內徑 d 7 -1.134 t 3/4公稱直徑 （英寸）每英寸牙數(shù)（n）螺距外螺紋外徑內螺紋內徑名義尺寸名義尺寸d =d-0.075t-0.0511/16141.81417.2815.43/8201.279.388.087/8112.312219.65/8141.8115.6913.823/4122.1218.8416.651/4260.9766.235.241/2161.58712.5310.91102.5425.152

18、2.52內螺紋d（公稱直往）外螺紋 d1=fi徑=-1.28t 3/4=19.05-1.28*2.116=16.343/4 =12 牙/英寸 t=2.116標準統(tǒng)一標準螺紋基本牙型和公式N :每25.4mm男牙數(shù)P = 25.4/N D二d:外 或大徑H = 08660P D2 = d2 = (d0.6495P)Hl =0.5412 PDl = dl = (dL0825P)公稱尺寸外徑D=d節(jié)徑D2=d2內徑D1=d1公稱尺寸外徑D=d節(jié)徑D2=d2內徑D1=d1粗牙UNC細牙UNF粗牙UNC；細牙UNF#0-801.5241.3181.1817/16-1411.1129.9349.149#1

19、-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#4-402.8452.4332.1565/8-1815.87514.95814.348#4-482.8452.5022.