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Small carbon steel flange coupling hub with 3/8 inch round keyed bore

Tb Wood'S

Tb Wood'S 3J38 Sure-Flex Sleeve Coupling Flange 3/8 in bore

SKU CH-K4JG-C7J30

Connects shafts in compressors, conveyors, motors and pumps with a 3/8 in bore and 78 in-lb torque rating

  • Handles 78 in-lb torque for reliable power transfer
  • Runs up to 9,200 RPM in demanding applications
  • Precision 3/8 in bore with tight tolerance
  • Carbon steel flange hub resists wear and corrosion
  • Compact 2 1/16 in OD fits tight machine spaces

Industrial Power Transmission Component

The Tb Wood'S 3J38 Sure-Flex sleeve coupling flange connects rotating shafts in compressors, conveyors, motors and pumps. It suits maintenance engineers and OEM assemblers who need a replaceable hub for inch-series drive lines.

Flange Hub with Keyed Bore

The carbon-steel flange hub has a 3/8 in round keyed bore with a tolerance of +0.0005 in to +0.0015 in and a 51/64 in length through bore. Its 1 1/2 in hub diameter and 13/32 in body length fit inside existing guards, while the 2 1/16 in outside diameter clears standard housing openings.

Rated for Continuous Operation

Maximum torque is 78 in-lb at speeds up to 9,200 RPM, allowing sustained power transfer without the short-burst limits of lighter couplings. The Sure-Flex sleeve design absorbs vibration and misalignment, reducing wear on connected bearings during extended duty cycles.

Highlights

  • Handles 78 in-lb torque for reliable power transfer
  • Runs up to 9,200 RPM in demanding applications
  • Precision 3/8 in bore with tight tolerance
  • Carbon steel flange hub resists wear and corrosion
  • Compact 2 1/16 in OD fits tight machine spaces

Specifications

No published specifications for this item yet.

Questions about this item

What maximum RPM can the 3J38 flange handle before vibration becomes a concern?

The coupling flange is rated for a maximum speed of 9,200 RPM, so sustained operation at or below that limit keeps vibration within design tolerances.

How much heat does the carbon-steel hub generate when the coupling runs continuously at full torque?

The carbon-steel hub itself produces negligible heat; temperature rise comes from the driven equipment, and the flange is rated for continuous duty at 78 in-lb torque.

What shaft diameter and keyway must already be on the motor or pump for this 3/8 in bore flange to fit?

The flange requires a 3/8 inch round shaft with a standard keyway, held to a bore tolerance of +0.0005 to +0.0015 inch.

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