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Cast iron spacer flange coupling hub with 7/8 inch round keyed bore

Tb Wood'S

Tb Wood'S 4JSC3578 Sure-Flex Coupling Spacer Flange 7/8 in Bore

SKU CH-4TPW-P9GZX

Connects shafts with a 7/8 in bore spacer flange rated for 156 in-lb torque at 600 RPM

  • Spacer hub extends shaft spacing for flexible alignment
  • Cast iron hub handles 156 in-lb torque reliably
  • 7/8 in round keyed bore fits standard shafts precisely
  • Bore tolerance +.0005 / +.0015 in ensures accurate fit
  • Rated to 7,600 RPM for high-speed applications

Spacer Flange for 4J Coupling Size

The TB Wood's 4JSC3578 spacer flange fits a 4J coupling and accepts a 7/8 inch round keyed bore. Cast iron hub construction supports compressors, conveyors, motors and pumps. Bore tolerance is held to +0.0005 in / +0.0015 in. This component connects driving and driven shafts in power transmission assemblies.

Sustained Operation at Rated Limits

The flange is rated for continuous speeds up to 600 RPM and a maximum torque of 156 in-lb. Cast iron material maintains dimensional stability under these loads without the deformation seen in lighter alloys. Steady-state running stays within the published limits for the 4J series. Heat buildup remains controlled during extended duty cycles.

Direct Replacement for Worn 4J Spacer Hubs

This part replaces a damaged or worn spacer flange on existing 4J coupling installations. The upgrade is worth it when bore wear exceeds the +0.0005 in / +0.0015 in tolerance or when hub cracks appear. It does not suit applications requiring a different coupling size or a bore diameter other than 7/8 inch.

How it compares

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

Price $38.99
Typical for this category: the median of 693 items is $35.99.

Specifications

No published specifications for this item yet.

Questions about this item

How much heat or vibration should I expect when this 4JSC spacer flange runs continuously at its 7,600 RPM limit?

The flange is rated for 7,600 RPM and 156 in-lb maximum torque; operating within those limits keeps vibration and heat at normal levels for cast-iron spacer hubs in compressor, conveyor, motor or pump drives.

What shaft and keyway must I already have to mount this 7/8 in bore spacer flange?

You need a 7/8 in round shaft with a standard keyway; the bore tolerance is +0.0005 in to +0.0015 in over nominal, so the shaft should fall within that range for a proper keyed fit.

Will this 4JSC spacer flange align with my existing Sure-Flex size 4 sleeves and hubs?

Yes — it is a Coupling Size 4 spacer hub with 2 in outside and hub diameters, 1 1/16 in length through bore, designed to mate directly with other Sure-Flex size 4 components.

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