What is a Spherical washer?

A spherical washer is a washer that is used as a set by combining a concave washer with a flat surface and a spherical surface on one side and an uneven washer with a flat surface and a convex spherical surface on the other side. Spherical washers are used to correct the angle of the shaft of taps and bolts that have been tightened obliquely and cannot be removed. If the bolt is obliquely fitted at an angle, only part of the axial force applied to the bolt is transmitted to the base material, so the axial force applied to the base material is reduced, and the remaining force is consumed as frictional force in the gap. The angle that can be corrected with a spherical washer is about 3 degrees, and if the angle is too large, no effect can be expected even if it is used, so tightening the bolt as much as possible can improve the power consumption.

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