Heidts Retainer Cage Nut

A Heidts retainer cage nut is a square, threaded nut enclosed in a spring steel cage. The cage has wings that compress to allow insertion into a mounting hole and then expand to lock the nut in place.

This design allows for minor adjustments and prevents the need for access to the back of the panel during assembly.

They are used in various automotive applications, particularly with Heidts suspension systems, to securely attach components to panels with square holes, offering high torque and holding power.