This specification covers the basic requirements for a fastener coating to prevent buildup of electrodeposited primers (E-coat).

Material Description. This coating is a fluoropolymer-based coating specially applied to the threads and other locations on a fastener (mostly on threads of nuts and studs). The coating prevents E-coat from adhering to the protected areas.

Symbols. Not applicable.

Typical Applications. Weld studs and nuts; clinch (pierce) nuts and studs; tapping plates.

Remarks. Use of this finish on threaded surfaces and/or bearing surfaces of joints could affect the torque-tension relationship. It is recommended that a torque-tension study of the fastener joint be performed before releasing this finish on a new application.