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Cast iron Sure-Flex coupling flange, 1-3/8 inch bore, 6 11/32 inch diameter

Tb Wood'S

Tb Wood'S 9S138 Sure-Flex coupling flange 9S bore 1-3/8 in

SKU CH-TQQH-45B71

Cast-iron flange hub for Sure-Flex sleeve couplings, 1-3/8 in bore, rated 2,340 in-lb at 3,750 RPM

  • Fits 1-3/8 in shafts with +0.0005/+0.0015 in tolerance
  • Cast iron flange handles 2,340 in-lb torque at 3,750 RPM
  • Sure-Flex sleeve design suits compressors, conveyors, motors and pumps
  • 6 11/32 in outside diameter matches size-9 coupling specs
  • 2 13/32 in bore length and 3 5/8 in hub diameter for secure mounting

Coupling Flange 9S Bore 1-3/8 in

The Tb Wood'S 9S138 Sure-Flex coupling flange is a cast-iron sleeve flange designed for power-transmission drives. It suits maintenance teams and OEM assemblers who need a direct-replacement flange for compressors, conveyors, motors or pumps. The round keyed bore accepts a 1-3/8 inch shaft with a tolerance of +0.0005 to +0.0015 inch. It installs without a separate bushing.

Capacity and Headroom

The size 9 flange rates 3,750 RPM maximum speed and 2,340 in-lb maximum torque. An outside diameter of 6 11/32 inch and hub diameter of 3 5/8 inch give a compact footprint for tight machine frames. Length through bore measures 2 13/32 inch with a hub body length of 25/32 inch. Exceeding the rated torque or speed will cause premature sleeve wear or flange failure.

Cast Iron Hub and Keyed Bore

The cast iron hub resists shock loads common on reciprocating equipment. The integral keyed bore eliminates the need for a separate bushing, reducing part count and alignment steps. No additional hardware or lubrication accessories are included in the package. Installers must supply their own key stock and set screws to complete the shaft connection.

How it compares

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

Price $63.99
Pricier than about 68% of the 693 comparable items (median $35.99).

Specifications

No published specifications for this item yet.

Questions about this item

Will the 1-3/8 in bore flange fit my existing 9S sleeve and shaft without rework?

The flange is a 9S size with a 1-3/8 in round keyed bore and a tolerance of +0.0005 to +0.0015 in, so it matches standard 9S sleeves and shafts made to the same dimensions.

How can I confirm the 9S flange is seated and running true after installation?

Check that the hub face sits flush against the sleeve, verify the key seats fully in the keyway, and run the shaft up to 3,750 RPM — smooth rotation without vibration indicates correct alignment.

Does the 9S138 flange ship with a key, set screws or a bushing, or must I supply them?

The box contains only the cast-iron flange hub; a square key, set screws and any bushing are not included and must be sourced separately.

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