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Metallic coupling flange with 7/8 inch bore, carbon steel hub, 2 1/2 inch outer diameter

Tb Wood'S

Tb Wood'S 4J78 Sure-Flex Sleeve Coupling Flange 7/8 in Bore

SKU CH-DACT-5SDCV

Sleeve coupling flange with 7/8 in bore handles 156 in-lb torque at 7,600 RPM

  • Fits 7/8 inch shafts with +.0005/+.0015 in tolerance
  • Handles up to 156 in-lb torque for compressors, conveyors, motors, pumps
  • Runs at 600 RPM maximum speed in sleeve coupling systems
  • Carbon steel flange hub with 2 1/2 in outside diameter for durability
  • 55/64 in length through bore ensures secure shaft engagement

Industrial Power Transmission Component

The TB Wood's 4J78 Sure-Flex sleeve coupling flange connects shafts in compressors, conveyors, motors and pumps. It is a carbon steel flange hub built for inch-system machinery requiring a 7/8 inch round keyed bore. The part transmits torque between driving and driven equipment in general industrial applications.

Suited for Replacement and New Builds

Maintenance teams and OEMs fitting Size 4 Sure-Flex couplings will find the correct bore tolerance of +0.0005 to +0.0015 inch. Shops needing a different coupling size, a larger bore diameter or a clamping-style hub should look at alternative product lines because this flange is fixed to the listed specifications.

Torque and Speed Headroom

The flange handles up to 156 in-lb of torque at speeds up to 7,600 RPM, covering typical light-duty pump and conveyor drives. Applications exceeding either limit or requiring a different hub length through bore of 55/64 inch will need a larger coupling assembly.

How it compares

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

Price $10.99
Cheaper than about 83% of the 693 comparable items (median $35.99).

Specifications

No published specifications for this item yet.

Questions about this item

Does this 4J flange need a specific bushing or can it mount directly on a 7/8-inch shaft?

The 4J78 flange has a 7/8-inch round keyed bore with a tolerance of +0.0005 to +0.0015 inch and no bushing size applies, so it mounts directly on a matching shaft with a keyway.

Will the 2-1/2-inch outside diameter and 1-5/8-inch hub diameter clear the same space as my old 4J coupling half?

Yes, the 4J size fixes the outside diameter at 2-1/2 inches and the hub diameter at 1-5/8 inches, so it matches the envelope of any other 4J flange.

After bolting the two flanges together with the sleeve, what shows the assembly is aligned and running within the 7,600 RPM limit?

Smooth rotation without vibration at operating speed and no visible wobble at the 2-1/2-inch outside diameter indicate the flanges are aligned and within the 7,600 RPM rating.

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