3 Star Inc 3/8-16-PAL 3/8"-16 Spring Steel Zinc Finish Self-Locking Hex Pal Nut
This is a 3/8"-16 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.
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