Rexnord 716106 Steel Disc Coupling Hub HUB DBZ 126 SB 1.375″

Key Specifications & Dimensions:

Parameter Value / Description
Coupling size 126
Maximum bore (shaft) 1.38 inches
Hub barrel outside diameter 2.06 inches
Hub flange outside diameter 3.84 inches
Hub length / style “Standard” style, with bolt shrouding (SB)

Materials, Finish & Construction:

The hub is typically manufactured from a robust steel or alloy material (as is standard for coupling hubs) to handle torque, fatigue, and alignment stresses. (While specific material grade is not listed in the publicly available spec, Rexnord’s coupling hubs are generally made of high-strength steel.)

The SB (Shrouded Bolt) design means the bolt heads are recessed or shielded, reducing the risk of damage, catching debris, or interference, and providing a cleaner external profile.

The hub is part of a modular coupling system; it mates with disc elements, flange bolts, and complementary hub halves to form a complete DBZ coupling assembly.

Functional Characteristics & Application Notes:

Torque Transmission: The hub transfers torque from a driven shaft to the disc pack (flexible element) of the coupling, thus enabling rotational power transmission while accommodating misalignment.

Misalignment Accommodation: The DBZ series is a disc coupling, which allows for limited angular, axial, and parallel misalignment through the flexing of the disc pack rather than hub deformation.

Bolt Attachment: The hub attaches to the coupling’s flange (center member) via bolts; the shrouded bolt design helps protect the bolt heads from contact and environmental exposure.

Assembly / Installation: The hub must be precisely aligned, bored or finish-machined (if rough bore), keyed (if required), and bolted to the disc pack and mating half. Proper torque on the flange bolts is critical.

Maintenance Considerations: The hub, like other coupling parts, should be inspected periodically for wear (e.g. keyways, bore wear, bolt integrity). Any signs of fatigue, cracking, or loosening must be addressed promptly.

Use Cases & Typical Industries:

This hub is used in industrial rotating machinery where DBZ disc couplings are applied, such as:

Pumps

Compressors

Gearboxes

Industrial drives

Heavy machinery in processing plants

Because the DBZ series is robust and modular, the hub can be part of a maintenance spare inventory, with finish‐bore options or remachining to various shaft sizes up to 1.38 in.