It is pointed out the value of tightening torque should guarantee that there is no slippage between cylinder and rasp bar when they work.

脱粒滚筒与纹杆间螺栓联接的扭紧力矩值应按保证工作时滚筒与纹杆间不发生滑移来确定。

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A section bar of a self tapping screw for saving drilling hole is provided with high-tightening force, which belongs to the design preparation technical field of the section bar.

可免钻孔上自攻螺丝并具有高紧固力的型材，属型材的设计制造技术领域。

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