螺纹联接的拧紧力矩计算

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1、螺纹联接的拧紧力矩计算Mt＝K×P0×d×10－3N.mK:拧紧力系数d：螺纹公称直径P0：预紧力P0＝σ0×AsAs也可由下面表查出As＝π×ds2/4ds:螺纹部分危险剖面的计算直径ds＝（d2＋d3）/2d3=d1－H/6H：螺纹牙的公称工作高度σ0＝（0.5～0.7）σsσs――――螺栓材料的屈服极限N/mm2（与强度等级相关，材质决定）K值查表：(K值计算公式略)摩擦表面状况K值有润滑无润滑精加工表面0.100.12一般加工表面0.13~0.150.18~0.21表面氧化0.200.24镀锌0.

2、180.22干燥的粗加工表面0.26~0.3σs查表：螺纹性能等级3.64.64.85.65.86.88.89.810.912.9σs或σ0.2N/mm21802403203004004806407209001080As查表：螺纹公称直径d/mm33.545678101214161820222427303336公称应力截面积As/mm25.036.788.7814.220.128.936.65884.3115157192245303353459561694817通过计算得到螺栓联接拧紧力矩如下表所示：钢结

3、构连接用螺栓性能等级分3.6、4.6、4.8、5.6、6.8、8.8、9.8、10.9、12.9等10余个等级，其中8.8级及以上螺栓材质为低碳合金钢或中碳钢并经热处理（淬火、回火），通称为高强度螺栓，其余通称为普通螺栓。螺栓性能等级标号有两部分数字组成，分别表示螺栓材料的公称抗拉强度值和屈强比值。例如，性能等级4.6级的螺栓，其含义是：1、螺栓材质公称抗拉强度达400MPa级；2、螺栓材质的屈强比值为0.6；3、螺栓材质的公称屈服强度达400×0.6=240MPa级性能等级10.9级高强度螺栓，其材料经

4、过热处理后，能达到1、螺栓材质公称抗拉强度达1000MPa级；2、螺栓材质的屈强比值为0.9；3、螺栓材质的公称屈服强度达1000×0.9=900MPa级螺栓性能等级的含义是国际通用的标准，相同性能等级的螺栓，不管其材料和产地的区别，其性能是相同的，设计上只选用性能等级即可表面被氧化（无润滑）的螺纹联接的拧紧力矩值（单位：N.m）性能等级3.64.64.85.65.86.88.89.810.912.9螺纹直径d/mmminmaxminmaxminmaxminmaxminmaxminmaxminmaxmin

5、maxminmaxminmax30.330.460.430.610.580.810.540.760.721.010.871.221.161.621.301.831.632.281.962.743.50.510.720.680.960.911.280.851.201.141.591.371.911.822.552.052.872.563.593.084.3140.761.061.011.421.351.891.261.771.692.362.022.832.703.783.034.253.795.314.5

6、56.3751.532.152.042.862.733.822.563.583.414.774.095.735.457.636.138.597.6710.749.2012.8862.603.653.474.864.636.484.346.085.798.106.959.739.2612.9710.4214.5913.0218.2315.6321.8874.376.125.838.167.7710.887.2810.209.7113.5911.6516.3115.5421.7517.4824.4721.85

7、30.5926.2236.7186.328.858.4311.8111.2415.7410.5414.7614.0519.6816.8723.6122.4931.4825.3035.4231.6244.2737.9553.131012.5317.5416.7023.3922.2731.1820.8829.2327.8438.9833.4146.7744.5462.3650.1170.1662.6487.7075.17105.241221.8530.5929.1340.7938.8554.3836.4250

8、.9848.5667.9858.2781.5877.69108.7787.40122.36109.25152.95131.10183.541434.7848.6946.3764.9261.8286.5557.9681.1477.28108.1992.74129.83123.65173.11139.10194.75173.88243.43208.66292.121654.2675.9672.35101.2896.46135.05