Boingy nut, pronounced <boing-gee nut, hard G sound> is a term used to describe a Unistrut Channel Nut W/Spring.
The spring helps retain the nut in the channel while one secures a bolt or all thread to the nut.
Photo from http://www.electrorack.com/ec/cw2/Assets/product_full/hardware200/unistrutnuts_200x.jpg.
The spring helps retain the nut in the channel while one secures a bolt or all thread to the nut.
Photo from http://www.electrorack.com/ec/cw2/Assets/product_full/hardware200/unistrutnuts_200x.jpg.