用力矩扳手正规测定拧紧力矩螺栓规格dmm螺距Pmm计算拧紧力 矩TNmSSMPa螺栓公称应力截 面积Asmm2外螺纹小径dimm外螺纹中径d2mm101.562.6390057.98959318.3762023689.025721421螺纹规格螺距螺纹联接件常用材料及机械性能M81.25,1,0.75,(0.5)钢号s b MPaM101.5,1.25,1,0.75,(0.5)10335400M121.75,1.5,1.25,1,(0.75),(0.5)Q235-A375460M142,1.5,(1.25),1,(0.75),(0.5)35530M162,1.5,1,(0.75),(0.5)45600M182.5,2,1.5,1,(0.75),(0.5)40Cr980M202.5,2,1.5,1,(0.75),(0.5)M243,2,1.5,1,(0.75)M273,2,1.5,1,(0.75)螺纹联接件对应强度等级的机械性能M303.5,(3),2,1.5,1,(0.75)等级s b MPaM333.5,(3),2,1.5,(1),(0.75)3.6300M364,3,2,1.5,(1)4.8400M394,3,2,1.5,(1)5.6500M424.5,(4),3,2,1.5,(1)8.8800M485,(4),3,2,1.5,(1)10.91040M525,(4),3,2,1.5,(1)M565.5,4,3,2,1.5,(1)M60(5.5),4,3,2,1.5,(1)M646,4,3,2,1.5,(1)M686,4,3,2,1.5,(1)M726,4,3,2,1.5,(1)M766,4,3,2,1.5,(1)M806,4,3,2,1.5,(1)螺纹原始三 角形高度Hmm计算直径d3mm0.8*TNm0.6*TMm1.299038：8.15969650.1037.58 1ss MPa205 235 315 355 785通常取计算值的0.8倍 左右作为实际应用的拧 紧力矩值.ss MPa180 320300640900