Does Double Nut Prevent Loosening

- Aug 31, 2019-

Double nuts. According to an article in Fastener + Fixing, the idea of using two nuts, a thick one and a thinner one (called a jammer nut), has been used for over 150 years to prevent loosening of bolted joints. ... In this way, transverse motions that may cause one nut to advance will not affect the second nut.