Split washer

A spring ring is used in a screw to prevent their accidental loosening.

Is a ring with a rectangular cross -section which is cut at one point and formed into a handle of a helix. The ring is placed between a nut or a screw head and the contact surface of the component to be clamped. When tightening the screw, the ring is elastically bent back into its original shape flat. The stored strain energy in it has content of the elastic deformation undergone by the screw as a whole, and thus is non-positively.

The cut edges are not trimmed, the outwardly facing Gratspitzen can dig into the contact surfaces of the nut or bolt head and to be clamped part. The cut is slanted so out through the ring that Gratspitzen when releasing (right hand thread ) act as barbs. Accordingly, the ring is made of hard steel.

Spring washers have long been used. They are still in use, although it was now recognized that their suitability is insufficient as a screw lock. Their share of the power circuit is negligibly small because of small deformable volume even with an ordinary screw. When locking screws or nuts of the achievable positive fit is much better than with just one each Gratspitze per page when spring ring. The DIN standard for spring rings was withdrawn.