The washer for use with this stud is the WAK notched end key hole slotted washer.
Designed to permanently lock on to weld pins or insul-anchors where appearance is a major factor, or where no sharp points or edges are permissible on the surface.
Decorative Domed Cap-Aluminum Self-Locking Insert-Hardened Steel
Plain (bright aluminum) or painted white. Other painted colors are available by special order.