The 1-5747871-4 is a 9-way 2-row front metal-shell D-sub Plug with gold-plated brass contacts and fixed zinc female screwlocks. The Amplimite HD-20 series straight posted plug comes with grounding indents, black thermoplastic housing, tin-plated steel shell, brass threaded inserts and tin-plated solder tail. Plugs are preloaded with size 20 DF posted pin contacts. Connectors are intermateable with any size 20 subminiature D connectors dimensionally complying with MIL-C-24308.