1/2"-13 Spring Steel Zinc Finish Self-Locking Hex Pal Nut
3 Star Inc
This is a 1/2"-13 Spring Steel Zinc Finish Self-Locking Hex Pal Nut that is installed over a standard hex nut. Also known as a counter nut or self-locking nut), it is a lightweight, vibration-resistant fastener stamped from spring steel that when tightened, its internal teeth or flanges "bite" into the main nut and the bolt threads, creating a secure, vibration-proof lock. It is primarily used to prevent larger load-bearing nuts from loosening due to vibration or dynamic loads and when properly tightened, the hex face becomes slightly concave, allowing for a quick visual check that the fastener is secure.
