GMW GMW15540 PDF

This standard applies to clinch nuts. The nuts may form its own hole or require a prepierced hole. The nuts may have prevailing torque feature.

A self-pierce-and-clinch nut is defined as an internally threaded fastener having a material piercing-punch feature along with anti-rotational and retention features such that when pressed against the application sheet or plate material the nut produces its own hole and engages the application material to becomes an integral part thereof.

Clinch nut is defined as an internally threaded fastener along with anti-rotational and retention features such that when pressed against the application sheet or plate material with a prepierced hole the nut engages the application material to become an integral part thereof.

Mission/Theme. This standard provides acceptance criteria for nuts clinched with or without prevailing torque feature used in automotive products that GM is responsible for establishing or approving the product design. This standard covers only the clinch acceptance criteria. All other properties of the nut should be defined in the nut specification.

Classification. The criteria established in this standard become mandatory when referenced in an assembly or product drawing or math data. Deviation from the criteria provided in this standard must be identified on a drawing or other product engineering design document.