Brass EMC M/PG/G/NPT BRASS EMC EMC Locknuts are used whenever glanding through varnished, powder coated or landing housings. The locknut has raised corners which break through the treated surface, grounding the cable gland. Material Nickel-plated brass / 5304 55316 Application EMC locknuts for reliable grounding with edges cutting through coated surfaces. Threads M/PG/G/NP