扭矩系数： 其中d为高强螺栓公称直径(mm)，M为施加扭矩值（N﹒M ），P为螺栓预紧力。10.9级高强度大六角螺栓连接必须保证扭矩系数K的平均值为0.110～0.150。其标准偏差应小于等于0.010。

Torque coefficient: where D is the nominal diameter (mm) of the high strength bolt, M is the applied torque value (M, N), and P is the bolt preload. 10.9 high strength large six angle bolt connection must ensure that the average value of the torque coefficient K is 0.110 ~ 0.150. The standard deviation should be less than or equal to 0.010.

摩擦系数： ，其中F为抗滑移试验所测得的使试件产生初始 滑移的力，nf为摩擦面数， 为与F对应的高强螺栓拧紧预拉力实测 值之和。

Friction coefficient: in which F is the initial sliding force measured by the anti slip test, NF is the number of the friction surface, which is the sum of the measured value of the high strength bolt tightening with the F.

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