AIA NASM45938

Clinch nuts covered by this specification are intended as permanent or captive type nuts installed into the parent structure by compression, swaging or flaring. Clinch nuts are intended to provide a more durable thread for disassembly and assembly in secondary and non-structural applications.

This specification covers the requirements for nuts which are permanently attached to a structure by pressing the nut shank or collar into a single hole. Anti-rotation and push-out resistance results from cold flow of the structure material into the shank or collar of the nut, or the flaring over of the nut shank.