Our steel round self-locking washers are designed to pair with a wide range of insulation fastening systems—including hangers, quilting pins, CD weld pins, lacing anchors, and lacing hooks—to securely lock insulation layers in place.

Featuring a 3-petal locking design (as opposed to the more common 6-petal style), this washer provides reliable grip and consistent holding force for standard insulation fixing applications.