Insulated, rigid 4mm socket connector, with gold-plated contacts and a 1.9mm solder pin. Suitable for accepting spring-loaded 4mm plugs with rigid insulating sleeve. Socket made from brass. Push-fit mounting into cutout holes in plates or housings made of plastic, metal etc. https://elecena.pl/product/28044007/st-xe4-ubli-233150-21-seb4-f63-safety-jack-socket-built-in-blk-4mm-brass 2025-03-19 https://elecena.pl/product/28044007/st-xe4-ubli-233150-21-seb4-f63-safety-jack-socket-built-in-blk-4mm-brass 2025-08-01 https://elecena.pl/product/28044007/st-xe4-ubli-233150-21-seb4-f63-safety-jack-socket-built-in-blk-4mm-brass 2026-05-17 https://elecena.pl/product/28044007/st-xe4-ubli-233150-21-seb4-f63-safety-jack-socket-built-in-blk-4mm-brass 2026-07-25