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they feature a serrated flange that digs into the mating surface to prevent loosening due to vibration or torque
and the zinc finish helps to protect the screw from corrosion
preventing it from backing out
they are designed to sit flush with the surface of the material
5/16-24 x 7/8 Hex Rod Coupling Nut 7/16 Across Flats Zinc WEBZ they feature a serrated flangeThis 5 16 24 x 7 8 Hex Rod Coupling Nut is designed to securely connect two threaded rods, providing a strong and stable joint. Made from durable zinc plated steel, it features a 7 16" across flats hex head for easy tightening and loosening with a wrench. The 5 16 24 thread size ensures compatibility with standard 5 16" diameter threaded rods. With its corrosion resistant zinc coating, this coupling nut is suitable for both indoor and outdoor
