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Cast iron flange coupling hub, keyed bore, matte grey finish

Tb Wood'S

Tb Wood'S 7S138 Sure-Flex Sleeve Coupling Flange 7S Bore 1-3/8 in

SKU CH-6AB8-J91T2

Connects shafts in compressors, conveyors, motors and pumps with a 1-3/8 inch bore and 940 in-lb torque capacity

  • Cast-iron flange handles 940 in-lb torque for reliable power transfer
  • Precision 1-3/8 in bore with +.0005/.0015 in tolerance ensures secure shaft fit
  • Rated to 5,250 RPM for high-speed compressor, conveyor, motor and pump drives
  • 4 5/8 in outside diameter and 1 27/32 in length suit compact coupling assemblies
  • Sure-Flex sleeve design accommodates misalignment and dampens vibration in operation

Industrial Sleeve Coupling Flange

The Tb Wood'S 7S138 is a cast-iron flange hub designed for power-transmission drives using Sure-Flex sleeve couplings. It fits a 1-3/8 inch round keyed bore and suits compressors, conveyors, motors and pumps that require a Size 7 coupling hub.

Speed Torque and Heat Limits

Rated for 5,250 RPM maximum speed and 940 in-lb maximum torque, the hub transmits power within those mechanical limits. Cast-iron construction dissipates heat from normal operation without forced cooling, and the solid hub runs quietly when the sleeve and driven equipment are correctly aligned.

Bore Tolerance and Fit

The bore tolerance of +0.0005 in to +0.0015 in provides a consistent interference or slip fit on standard 1-3/8 inch shafts, reducing fretting and key wear. No bushing is required for this flange hub, so installation uses the keyway and set screws directly on the shaft.

Highlights

  • Cast-iron flange handles 940 in-lb torque for reliable power transfer
  • Precision 1-3/8 in bore with +.0005/.0015 in tolerance ensures secure shaft fit
  • Rated to 5,250 RPM for high-speed compressor, conveyor, motor and pump drives
  • 4 5/8 in outside diameter and 1 27/32 in length suit compact coupling assemblies
  • Sure-Flex sleeve design accommodates misalignment and dampens vibration in operation

Specifications

No published specifications for this item yet.

Questions about this item

How do I install the 7S138 flange onto a 1-3/8 in shaft and what step is most often missed?

Press the flange onto the shaft within the +0.0005/+0.0015 in bore tolerance, insert the key into the keyway, then tighten the set screw over the key — skipping the key is the common error.

What maintenance or replacement will the 7S coupling need over time?

The elastomer sleeve between the two 7S flanges wears first; inspect it for cracks or compression set and replace the sleeve while reusing the cast-iron flanges.

At 5,250 RPM what limit appears first during continuous operation?

The 940 in-lb torque rating is reached before the speed limit; sustained loads above that value will overheat the sleeve and cause premature failure.

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