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Cast-iron spacer hub with 1-7/8 inch round keyed bore

Tb Wood'S

Tb Wood'S 9SCH178 Sure-Flex Coupling Spacer Hub 9SC Bore 1-7/8 in

SKU CH-Z75Y-TF3QE

A cast-iron spacer hub for size 9 sleeve couplings with a 1-7/8 inch bore, rated to 3,750 RPM and 2,340 in-lb torque

  • Designed for compressors, conveyors, motors and pumps
  • Cast iron construction handles up to 3,750 RPM
  • Transmits torque to 2,340 in-lb with 1-7/8 in bore
  • Precision keyed bore tolerance of +.0005 in to +.0015 in
  • Spacer hub design suits sleeve coupling size 9 applications

Product Identity

The Tb Wood'S 9SCH178 is a cast iron spacer hub designed for Sure-Flex coupling size 9. It suits maintenance teams and original-equipment builders who need a 1-7/8 inch round keyed bore for compressors, conveyors, motors or pumps.

Compatibility Check

Verify that the driven and driving shafts both measure 1-7/8 inch diameter within the +0.0005 to +0.0015 inch tolerance. Confirm the coupling assembly uses size 9 sleeves and that the 3 5/8 inch outside diameter clears adjacent guards or brackets.

Thermal, Noise and Power Profile

The hub transmits up to 2,340 in-lb at speeds up to 3,750 RPM without generating measurable heat or noise of its own. Power loss is limited to the flexible sleeve, so the spacer hub adds no extra cooling requirement to the drivetrain.

How it compares

Measured against everything we stock in Bearings, Belts & Drive Components, at today’s prices. Recalculated every night.

Price $71.99
Pricier than about 72% of the 693 comparable items (median $35.99).

Specifications

No published specifications for this item yet.

Questions about this item

Does the 9SC spacer hub arrive with the coupling sleeve or any mounting hardware?

The hub is sold alone; the matching Sure-Flex sleeve and any required fasteners must be purchased separately.

My shaft is 1-7/8 in — is this the only bore size offered for the 9SC spacer hub?

The listed hub is machined for a 1-7/8 in round keyed bore; other bore sizes are not described in the product information.

What does the 3,750 RPM rating mean when the hub is installed on a pump shaft?

It is the maximum safe rotational speed; operating the pump shaft above 3,750 RPM with this hub installed could exceed the design limit.

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