brass nut of cable connector, cable gland, m12/m14/,,,,,,,m64 1)OEM/ODM, completable specification, 2)Professional

brass nut

brass nut of cable connector (cable gland), m12/m14/,,,,,,,m64..

The brass nut is part of  the cable gland(cable connector).

Back off nuts, and let the thread part of the cable gland get through the hole of the Steel plate, then tighten the

 nut.