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Cast iron spacer hub with 7/8 inch keyed bore

Tb Wood'S

Tb Wood'S Sure-Flex Sleeve Coupling Spacer Hub 7SC Bore 7/8 in

SKU CH-NHNC-1DJW4

Connects shafts in compressors, conveyors, motors and pumps with a 7/8 in bore spacer hub rated to 5,250 RPM and 940 in-lb torque

  • TypeCouplings, Collars & Adapters
  • Handles high-torque drives with 940 in-lb capacity
  • Runs up to 5,250 RPM for demanding applications
  • Precise fit from +0.0005/+0.0015 in bore tolerance
  • Durable cast-iron construction resists wear
  • 7/8 in round keyed bore matches standard shafts

Coupling Spacer Hub 7SC

The Tb Wood'S Sure-Flex spacer hub is a cast-iron coupling component built for power-transmission systems. It suits maintenance teams and OEMs fitting compressors, conveyors, motors or pumps that require a 7/8 in round keyed bore.

Thermals, noise and power

As a passive metal hub it generates no heat, produces no audible noise and draws no electrical power during operation. The assembly simply transmits torque up to 940 in-lb at speeds up to 5,250 RPM without adding thermal or acoustic load.

Bore tolerance and fit

The bore tolerance of +0.0005 in to +0.0015 in ensures a precise interference fit on standard 7/8 in shafts, reducing backlash and fretting. No bushings or additional adapters are required, so installation time and parts count stay minimal.

Highlights

  • Handles high-torque drives with 940 in-lb capacity
  • Runs up to 5,250 RPM for demanding applications
  • Precise fit from +0.0005/+0.0015 in bore tolerance
  • Durable cast-iron construction resists wear
  • 7/8 in round keyed bore matches standard shafts

Specifications

TypeCouplings, Collars & Adapters

Questions about this item

How do I install the 7/8 in bore spacer hub on a shaft, and what tolerance step is often missed?

Press the hub onto the shaft using the +0.0005 in / +0.0015 in bore tolerance, then secure the key in the round keyed bore; the step often missed is verifying the shaft diameter falls within that tight tolerance before assembly.

What maintenance or replacement will the cast iron spacer hub need later in service?

Inspect the cast iron hub and keyway for wear or fretting during scheduled downtime; replace the hub if the 7/8 in bore shows elongation beyond the original +0.0005 in / +0.0015 in tolerance or if the key no longer transmits torque cleanly.

At 5,250 RPM and 940 in-lb torque, which limit appears first during continuous operation?

The 5,250 RPM maximum speed limit is reached first; sustained operation at that speed with full 940 in-lb torque leaves no margin for dynamic overloads, so monitor vibration and temperature to avoid exceeding the rated speed.

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