下螺母凸顶的滑动零件上有一条小弧线充当楔块。
A small curve in the sliding part of the convex top of the lower nut acts as the wedge.
松孔镀铬层应用于受重压的滑动摩擦件及耐热、抗蚀、耐磨零件，如内燃机汽缸内腔、活塞环等。
Loose hole plating chromic layer by weight used in the sliding friction parts and heat resistance, corrosion, wear parts, such as internal combustion engine cylinder lumen, piston rings.
之所以这样是因为对运动的阻力基本上源于滚动零件的变形，而不是滑动现象。
This is so because the resistance to motion is essentially due to the deformation of the rolling elements and, hence, is not a sliding phenomenon.
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