NAS1640-2 | 軍規鎖緊墊圈 (25個/包)

I needed a reliable fix for some loose bolts in my trailer, and these lock washers really grabbed hold. The split design creates solid tension even under heavy road vibration.

The teeth on these washers bit into the bolt head just as described, and so far none of the fasteners have loosened on my trailer hitch. Exactly what you need for a shaky application.

Used these on a steel bracket assembly that sees a lot of shaking, and every fastener stayed tight after a week of run time. The mil-spec finish feels tough and the 25-count pack gives you plenty for a small job.