Thomas & Betts SP-643-1 Flush Service Floor Box

The Thomas & Betts SP-643-1 Flush Service Floor Box is a three-gang, flush-mount in-floor enclosure from the Steel City 640 Series that provides 111 cu in of wiring capacity for power, communications, and data services. Its heavy-duty cast-iron body with brass trim and a painted silver enamel finish delivers durability and corrosion resistance in concrete floor installations, with 1 in. tapped conduit hubs and fully adjustable, watertight construction. Designed for in-floor access in commercial offices, educational facilities, conference rooms, retail spaces, airports, and industrial settings, it supports concrete, carpet, and tile floors and is commonly installed by electrical contractors, maintenance personnel, and system integrators. Standards include UL Listed (UL File E2969), CSA Certified, and RoHS Compliant; dimensions are 4-1/2 in. L × 3 in. W, with interior and exterior leveling screws, removable partitions, and an expendable concrete pour cap for flexible configuration. Common replacements: Thomas & Betts 643; SP-643-1-AL; SP-643-1-1.