- BUILT-IN WASHER ON UNDERSIDE: Protects material while eliminating the need for an additional flat washer
- VIBRATION-RESISTANT: Nylon insert helps retain integrity of the fastener when vibrating force is applied
- MADE USING GRADE 8 STEEL: Appropriate for marine and heavy machinery applications (match with Grade 8 washers and nuts)
- WIDE FLANGE DESIGN: Acts as a non-spinning washer
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