20 Pack 1/4\"-20 Serrated Flange Nuts Grade 8 Heavy Duty Alloy Steel High-Torque For Sale

BUILT-IN LOCKING ACTION: Each nut features integrated serrations that bite into the mating surface to resist loosening from vibration and movement—helping stop rattles and repeat tightening. Fits 1/4\" carriage bolts. Hex Drive Size: 7/16\".SAE J995 GRADE 8 STRENGTH: Manufactured to SAE J995 Grade 8 standards for high tensile strength and durability in demanding, vibration-prone applications.ANTI-RATTLE HARDWARE UPGRADE: Perfect for replacing standard nuts that back off over time—ideal for garage door tracks, opener brackets, gates, and metal assemblies that are prone to noise and vibration.NO EXTRA WASHERS NEEDED: The serrated flange design acts like a built-in lock washer, saving time and parts while ensuring a secure, professional-grade installation.CLEAR ZINC-PLATED FOR LONG-TERM DURABILITY: Protective clear zinc finish resists rust and corrosion in garages, workshops, and outdoor