螺纹紧固件拧紧力矩.docx

中华人民共和国汽车行业标准

汽车用螺纹紧固件拧紧力矩规范

本标准适用于碳素钢或合金钢制造的螺纹直径为6-20㎜、6级精度以上的汽车用一般螺栓、螺钉、螺柱和螺母的紧固。其螺纹尺寸及公差按GB193-1981《普通螺纹直径与螺距系列》、GB196-1981《普通螺纹基本尺寸》和GB197-1981《普通螺纹公差与配合》标准的规范；螺栓、螺钉、螺柱和螺母机械性能，螺栓、螺钉、螺柱与螺母被拧入基体件强度级别的组合按GB3098-1982《紧固件机械性能》标准的规定。
本标准不适用于承受交变载荷或加润滑剂装配的螺栓、螺钉、螺柱和螺母的紧固件，以及紧定螺钉和类似的不规定抗拉强度的螺纹紧固件。
1、汽车用螺纹紧固件拧紧力矩
1.1机械性能为4.6级的螺栓、螺钉和螺柱，其拧紧力矩按表1的规定。
螺纹直径（㎜）螺距（㎜）拧紧扭矩标准值最大值最小值N·mkgf·mN·mkgf·mN·mkgf·m614.00.45.50.62.50.381.258.00.811.01.15.00.5818.50.911.51.25.50.6101.519.72.024.72.514.31.5101.2520.82.125.82.616.71.710121.82.226.52.717.01.7121.7537.33.843.34.428.02.9121.538.53.945.04.629.03.0121.2539.64.048.04.930.03.114261.26.275.07.646.84.8141.574.67.692.09.456.05.716295.09.7115.011.773.07.4161.5105.010.7133.013.676.07.7182.5142.914.6178.018.1107.410.9181.5157.616.1190.019.4124.512.7202.5188.019.2230.023.4135.013.8201.5203.720.8243.024.8149.015.2
国家机械工业局1999-03-15批准实施

1.2机械性能为5.6级的螺栓、螺钉和螺柱，其拧紧力矩按表2规定。
螺纹直径（㎜）螺距（㎜）拧紧扭矩标准值最大值最小值N·mkgf·mN·mkgf·mN·mkgf·m614.50.56.00.63.00.381.2510.61.114.01.47.00.78111.01.115.01.58.00.8101.526.02.733.03.419.01.9101.2528.02.934.03.522.02.210129.03.035.03.623.02.3121.7545.04.653.05.437.03.8121.547.04.856.05.738.03.9121.2550.05.160.06.140.04.114281.08.395.09.762.06.3141.590.09.2105.010.768.06.9162124.012.6150.015.398.010.0161.5132.013.5160.016.3101.010.3182.5190.019.4220.022.4161.016.4181.5200.020.4230.023.4165.016.8202.5231.623.6272.027.7190.019.4201.5246.625.1285.029.1197.020.1302793.681950.197637.165.01.3机械性能为8.8级的螺栓、螺钉和螺柱，其拧紧力矩按表3规定。
螺纹直径（㎜）螺距（㎜）拧紧扭矩标准值最大值最小值N·mkgf·mN·mkgf·mN·mkgf·m6190.9121.260.681.25232.3262.7161.681252.5282.9171.7101.5596.0757.6373.8101.25636.4798.1454.6101646.5808.2464.7121.75959.711111.3737.4121.5979.911311.5757.6121.259910.111511.7788.014216016.318518.912212.4141.518018.320520.914614.916221521.924525.018218.6161.524024.527027.519920.3182.526827.329830.422923.3181.531632.234635.328729.3202.543043.847047.938939.7201.544044.948048.939640.41.4机械性能为10.9级的螺栓和螺柱，其拧紧力矩按表4规定。
螺纹直径（㎜）螺距（㎜）拧紧扭矩标准值最大值最小值N·mkgf·mN·mkgf·mN·mkgf