Black Box FMT639-R3 CAT6 RJ-45 Keystone Jack

Preserve CAT6 performance at the termination point with the Black Box FMT639-R3 keystone jack. Designed for use with GigaTrue CAT6 cables, it meets TIA/EIA-568-C.2 requirements and supports data transmission up to 250 MHz. The RJ-45 female interface, gold contact plating, and phosphor bronze contact material are specified to maintain consistent electrical performance across structured cabling links. This jack is built for Black Box GigaStation2 wallplates and surface-mount housings, making it a practical fit for office, campus, and equipment-room installations where clean terminations matter. Universal wiring with both T568A and T568B labeling simplifies deployment and reduces installation errors across mixed environments. Backward compatibility with CAT5e, CAT5, and CAT3 components helps support phased upgrades without replacing every endpoint at once. A keystone-style form factor and strain relief support a tidy, serviceable finish. For teams that need a termination component that matches the cable plant instead of becoming the weak point, this jack delivers the specification discipline expected in higher-value infrastructure builds.