品质管理技术标准Word文档下载推荐.docx

1、NPT国标Rp/Ps细螺纹粗螺纹超细螺纹公制MUNFUNCUNEF常见螺纹的种类类型 牙型放大图 特征代号 标注示例 用途及说明 普通螺纹 粗牙 M 最常见的一种联接螺纹,直径相同时,细牙螺纹的螺距比粗牙螺纹的螺距小,粗牙螺纹不注螺距 细牙 管螺纹 非螺纹密封 G 管道联接中的常见螺纹,螺距及牙型均较小,其尺寸代号以in为单位,近似地等于管子的孔径。螺纹的大径应从有关标准中查出,代号R表示圆锥外螺纹,Rc表示圆锥内螺纹, Rp表示圆柱内螺纹 螺纹密封 Rc Rp R 梯形 螺纹 Tr 常见的两种传动螺纹,用于传递运动和动力,梯形螺纹可传递双向动力,锯齿形螺纹用来传递单向动力 距齿形螺纹 B 2

2、.3 精度等级螺纹精度是由螺纹公差带和旋合长度共同组成的衡量螺纹质量的综合指标。螺纹公差带代号包括中径公差带与顶径公差带代号。公差带代号是由表示其大小的公差等级数字和表示其位置的字母组成。如6H,6g等。螺纹公差带代号标注在螺纹代号之后,中间用分开。如螺纹的中径公差带与顶径公差带代号不同,则分别注出。前者表示中径公差带,后者表示顶径公差带。如螺纹的中径公差带与顶径公差带代号相同,则只注一个代号。名称螺纹等级螺纹种类国家标准公制牙JIS1级2级3级公螺纹ISO4h6g8g母螺纹4H.5H5H.6H7H美制牙3A2A1A3B2B1B英制牙4级2.4 螺纹标注当螺纹精度要求较高时,除标注螺纹代号外,

3、还应标注螺纹公差带代号和螺纹旋合长度。2.4.1 螺纹标记的标注格式为:螺纹代号螺纹公差带代号（中径、顶径）旋合长度l）公差带代号由数字加字母表示（内螺纹用大写字母,外螺纹用小写字母）,如 7H、6g等,应特别指出,7H,6g等代表螺纹公差,而H7,g6代表圆柱体公差代号。2）旋合长度规定为短（用S表示）、中（用N表示）、长（用L表示）三种。一般情况下,不标注螺纹旋合长度,其螺纹公差带按中等旋合长度（N）确定。必要时,可加注旋合长度代号S或L,如” M20-5g6gL”。特殊需要时,可注明旋合长度的数值,如”M20-5g6g30”。2.4.2、普通螺纹普通粗牙螺纹:特征代号M+ 公称直径+旋向

4、+螺纹公差带代号（中径、顶径）旋合长度普通细牙螺纹:特征代号M+ 公称直径*螺距+旋向+螺纹公差带代号（中径、顶径）旋合长度右旋螺纹省略不注,左旋用” LH”表示。M 165g6g表示粗牙普通螺纹,公称直径16,右旋,螺纹公差带中径 5g,大径 6g,旋合长度按中等长度考虑。M161 LH6G表示细牙普通螺纹,公称直径16,螺距1,左旋,螺纹公差带中径、大径均为6G,旋合长度按中等长度考虑。2.4.3、管螺纹的标注格式为:特征代号（圆柱管螺纹用G表示,圆锥管螺纹用NPT表示）+尺寸代号+公差等级代号+旋向G1A-LH表示英制非螺纹密封管螺纹,尺寸代号1in,右旋,公差等级为A级。Rcl2表示英

5、制螺纹密封锥管螺纹,尺寸代号12in,右旋。2.5 基本尺寸2.5.1公制螺纹公制细牙内螺纹公制粗牙内螺纹规格标准径6H精度DmaxDminM2.5*0.352.15 2.1842.121M1.4*0.31.10 1.161.075M3.0*0.352.65 2.6842.621M1.6*0.351.25 1.3211.221M3.5*0.353.15 3.2213.121M1.8*0.351.45 1.5211.421M4.0*0.503.50 3.5993.459M2.0*0.41.60 1.6791.567M4.5*0.504.00 4.0993.959M2.2*0.451.75 1.8

6、381.713M5.0*0.504.50 4.5994.459M2.5*0.452.05 2.1382.013M5.5*0.505.00 5.0994.959M3.0*0.52.50 2.5992.459M6.0*0.755.25 5.3785.188M3.5*0.62.90 3.012.85M7.0*0.756.25 6.3786.188M4.0*0.73.30 3.4223.242M8*0.757.25 7.3787.188M4.5*0.753.75 3.8783.688M8*1.007.00 7.1536.917M5.0*0.84.20 4.3344.134M9*0.758.25 8.3

7、788.188M5.5*0.5M9*1.008.00 8.1537.917M6.0*1.005.1534.917M10*0.759.25 9.3789.188M7.0*1.006.00 6.1535.917M10*1.009.11 9.1538.917M8.0*1.256.75 6.9126.647M10*1.258.75 8.9128.647M9.0*1.257.75 7.9127.647M11*0.7510.25 10.37810.188M10*1.508.50 8.6768.376M11*1.0010.00 10.1539.917M11*1.509.50 9.6769.376M12*1.

8、0010.75 10.91210.647M12*1.7510.4410.106M12*1.2510.50 10.67610.376M14*2.0012.00 12.2111.835M12*1.5011.00 11.15310.917M15*1.5013.50 13.67613.375M14*1.0013.00 13.15312.917M16*2.0014.00 14.2113.835M14*1.2512.75 12.91212.647M17*1.5015.50 15.67615.376M14*1.5012.50 12.67612.376M18*2.5015.74415.294M15*1.014

9、.15313.917M20*2.5017.50 17.74417.29413.376M22*2.5019.50 19.74419.294M16*1.015.00 15.15314.917M24*3.0021.00 21.25220.752M16*1.5014.50 14.67614.376M27*3.0024.00 24.25223.752M17*1.016.00 16.15315.917M30*3.5026.50 26.77126.21116.676M18*1.017.00 17.15316.917M18*1.516.50 16.376M18*2.016.2115.835M20*1.019.

10、00 19.15318.917M20*1.5018.50 18.67618.376M20*2.018.00 18.2117.835M22*1.021.15320.917M22*1.5020.50 20.67620.376M22*2.020.00 20.2119.835M24*1.023.00 23.15322.917M24*1.5022.50 22.67622.376M24*2.022.00 22.2121.835M25*1.024.15323.917M25*1.523.50 23.67623.376M25*2.023.2122.835M26*1.5024.50 24.67624.376M27

11、*1.026.00 26.15325.917M27*1.525.50 25.67625.376M28*1.027.00 27.15326.917M28*1.526.67626.376M28*2.026.2125.835M30*1.029.00 29.15328.917M30*1.5028.50 28.67628.376M30*2.028.00 28.2127.835M30*3.027.25226.7525.5.2统一标准螺纹公称尺寸大径中径小径UNC粗牙UNF细牙0-801.5241.3181.1819/16-1214.28812.91311.9961-641.8541.5981.4259/1

12、6-1813.37112.7611-721.6261.4375/8-1114.8752-561.891.6945/8-1814.95814.3482-641.9281.7553/4-1019.050 17.39916.301 3-842.5152.1721.9413/4-1618.01917.337 3-562.222.0247/8-922.225 20.39119.169 4-402.8452.4332.1567/8-1421.04620.265 4-482.5022.2711-825.400 23.33821.963 5-403.1752.7642.4871-1224.02623.109

13、5-442.7092.5511 1/8 -728.575 26.21824.648 6-323.5052.992.6471 1/8-1227.20126.284 6-403.0942.8171 1/4 -731.750 29.39327.823 8-324.1643.653.3071 1/4-1230.37629.459 8-363.7083.4011 3/8 -634.925 32.17430.343 10-244.8264.1383.681 3/8-1233.55132.634 10-324.313.9671 1/2 -638.100 35.34933.518 12-245.4864.79

14、84.3411 1/2-1236.72635.809 12-284.8974.5031 3/4-544.450 41.15138.951 1/4-206.355.5244.972-4 1/250.800 47.13544.690 1/4-285.7615.3672 1/4-4 1/257.150 53.48551.039 5/16-187.9387.0216.4112 1/2-463.500 59.37556.626 5/16-247.2496.7922 3/4-469.850 65.72562.976 3/8-169.5258.4947.8053/476.200 72.07569.326 3

15、/8-248.8378.3973 1/4-4 82.550 78.42575.676 7/16-1411.1129.9349.1493 1/2-488.900 84.77582.026 7/16-2010.2879.7383 3/4-495.250 91.12588.376 1/2-1312.711.4310.5844-4101.600 97.47594.726 1/2-2011.87411.326UNEF螺牙基本尺寸代号螺纹牙数 1/4325.65.695/167.17.2647.0873/88.78.8658.6617/162810.210.33810.1351/211.811.93811

16、.7099/162413.213.38613.1325/814.814.98614.7323/42017.817.95817.6787/82121.13320.853124.30824.0285.5.3 NPT、G螺纹基本尺寸NPT螺纹基本尺寸G（PF）螺纹基本尺寸1/16277.8957.1426.3897.7236.561 1/810.2429.4898.7369.7289.1478.5661813.61612.48711.3581913.15712.30111.445 3/817.05515.92614.79716.66215.80614.95 1/21421.22319.77218.32120.95519.79318.631 3/426.56825.11723.666 5/822.91121.74920.5871 11.533.22831.46129.69426.44125.27924.1171 1/441.98540.21838.451 7/830.20129.03927.877