We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Cast iron spacer hub with 1-1/8 inch round keyed bore

Tb Wood'S

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

SKU CH-MZ4S-J6KFZ

Connects shafts with a 1-1/8 inch bore spacer hub rated for 3,750 RPM and 2,340 in-lb torque

  • TypeCouplings, Collars & Adapters
  • Delivers up to 340 in-lb torque for demanding drives
  • Runs at 750 RPM maximum speed in compressor and pump systems
  • Cast-iron spacer hub resists wear in conveyor and motor applications
  • 1-1/8" round keyed bore with +.0005/+.0015 in tolerance ensures precise shaft fit
  • Compact 3-5/8" diameter hub fits tight machine envelopes

Tb Wood'S Sure-Flex Spacer Hub

The Tb Wood'S Sure-Flex spacer hub connects shafts on compressors, conveyors, motors and pumps. It accepts a 1-1/8 inch round keyed bore with a tolerance of +0.0005 to +0.0015 inch. The cast iron hub measures 3 5/8 inch in outside and hub diameter. It is built for inch-system power transmission assemblies.

Capacity and Headroom

Maximum torque capacity reaches 2,340 in-lb while the speed limit sits at 3,750 RPM. The hub length through bore is 1 31/32 inch, giving the spacer its working envelope. Operation beyond the rated torque or speed will exceed the design limits of the cast iron construction. No bushing is used with this hub type.

Upgrade Path

This spacer hub replaces a worn or damaged coupling hub of the same 9SC size and bore. The jump is worth it when vibration, keyway wear or bore elongation degrades alignment on existing equipment. It does not suit applications needing a different coupling size, a larger bore or a bushed hub configuration.

Highlights

  • Delivers up to 340 in-lb torque for demanding drives
  • Runs at 750 RPM maximum speed in compressor and pump systems
  • Cast-iron spacer hub resists wear in conveyor and motor applications
  • 1-1/8" round keyed bore with +.0005/+.0015 in tolerance ensures precise shaft fit
  • Compact 3-5/8" diameter hub fits tight machine envelopes

Specifications

TypeCouplings, Collars & Adapters

Questions about this item

Will this spacer hub run at 3,750 RPM when paired with an older motor shaft?

The spacer hub is rated for a maximum speed of 3,750 RPM and a maximum torque of 2,340 in-lb, so it will operate within those limits when matched to a compatible shaft and sleeve.

How can I confirm the 1-1/8" bore fits my shaft after installation?

Measure the installed bore; the tolerance is +0.0005 in to +0.0015 in over 1-1/8 in, so a shaft within that range will seat correctly.

Does the box include the coupling sleeve or only the spacer hub?

The listing describes the spacer hub alone — cast iron, 3-5/8 in outside diameter, 1-31/32 in length through bore — so the sleeve must be purchased separately.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.