MIDWEST FASTENER CORP 64504 Coupling Nut 3/8"-16 Steel Grade 2 Zinc Plated

Coupling Nut for Threaded Rods

This MIDWEST FASTENER 64504 coupling nut joins two 3/8"-16 threaded rods end to end. Its internal threads meet in the centre so each rod engages fully without passing through. The Grade 2 steel body provides standard fastening strength for general mechanical assemblies. Zinc plating adds a layer of corrosion resistance for indoor or sheltered outdoor use.

Fit and Clearance in a Build

The nut requires a wrench or socket that fits its external hex profile for installation. Because it bridges two rods, it eliminates the need for a separate turnbuckle or sleeve in tension applications. The zinc finish does not add measurable thickness, so standard 3/8"-16 thread gauges remain valid for inspection. No additional washers or lock nuts are mandated by the design itself.

Behaviour Under Sustained Load

Under continuous tension the Grade 2 steel stretches predictably within its elastic limit before any permanent deformation. The zinc coating remains intact unless the nut is over-torqued past the substrate yield point. Vibration does not loosen the joint unless the mating rods back out, so periodic re-tightening is only needed in high-cycle dynamic service. Creep is negligible at ambient temperatures for static loads.