RS PRO is a standard industrial fastener series offering a bright zinc-plated steel coupling nut designed for M10 threaded rod connections in mechanical assemblies. This 30mm length coupling nut is used to join two threaded rods end-to-end or secure components to threaded studs. Critical verification: confirm zinc plating thickness meets ISO 1461 Class C (minimum 45 µm) for corrosion protection in your operating environment.