Tsubaki T4-FH-3.375 FLEX Hub Atra-Flex Belt Drive Hub

The Tsubaki T4-FH-3.375 FLEX Hub is the 3.375-inch Flex Hub component of the ATRA-FLEX T-Series belt-drive couplings, sized T4 for use with the matching drive ring and insert. In ATRA-FLEX systems, the flex hub is installed on the shaft with the drive ring fitted over the hub, forming a modular torque-transmission assembly that accommodates misalignment and torsional variation. The T-Series comprises four parts—the ring hub, flex hub, insert, and drive ring—allowing a complete, customizable coupling solution for belt-drive applications. The T4 size corresponds to a 3.375-inch footprint (MBFH in Tsubaki catalogs), making it suitable for compact installations where space is at a premium. As with other ATRA-FLEX components, this flex hub is designed to deliver reliable performance from a trusted manufacturer of flexible couplings, enabling smooth operation in belt-driven machinery that requires controlled misalignment tolerance.