Midwest Fastener
Instead of threads a push nut uses flanges facing inward acting as teeth to hold it in place. It can be pushed or lightly tapped into place and requires cutting to remove.
Diameter: 5/8"Material: SteelFinish: ZincStyle: Washer CapType: Push Nut
Midwest Fastener Round Wire Lock Pins Zinc
Midwest Fastener Acorn Cap Nuts Zinc
Midwest Fastener External Retaining Rings Steel
Midwest Fastener Hollow Wall Anchors Zinc
Midwest Fastener Cable Ferrule Aluminum