API螺纹啮合后存在的螺旋性间隙是导致螺纹接头泄漏的根本原因。
It is the helical clearance area in API connections after making up that contributes to leaking.
在手指旋转使螺纹啮合无间隙后，再用带式扳手旋转不要超过一至两圈。
Apply strap wrench make-up of no more than one to two turns beyond finger tight thread engagement.
研究结果表明：接触应力、上扣扭矩、螺纹啮合时的几何约束，是齿面粘扣的力学要点。
The research result states that the contacting stress, thread torque and thread joggle geometry restriction are mechanical points of the sticky thread.
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