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Black oxide steel sprocket, 28 teeth, 3/8 inch plain bore

Tsubaki

Tsubaki 25B28 Sprocket 25 Chain 28 Teeth 3/8 Bore

SKU CH-QM07-C7J03

Transmits power for 25 chain with 28 teeth, 3/8 inch plain bore, steel construction and black oxide finish

  • Precision fit with 28 teeth for #25 chain
  • 3/8 in plain bore with 3/64 in keyway depth
  • 1045 steel construction with black oxide finish
  • 233 in pitch diameter ensures smooth engagement
  • Includes set screws for secure shaft mounting

Tsubaki 25B28 Sprocket for #25 Chain

This Tsubaki 25B28 sprocket is a plain-bore steel component built for #25 single-pitch chain. It carries 28 teeth on a 2.233 in pitch diameter and a 2.369 in outside diameter. The 3/8 in bore includes a 3/32 in keyway and set screws for positive drive. The hub projects 0.515 in and measures 1 1/2 in across.

Ideal for light-duty drives needing a #25 chain

Maintenance teams and OEM builders running #25 chain on 3/8 in shafts will find the tooth count, keyway and hub projection ready to install. Operations requiring a different pitch, a larger bore without machining, or a multi-strand sprocket should select another part.

Verify shaft diameter.

Confirm the driven shaft measures exactly 3/8 in and accepts a 3/32 in wide by 3/64 in deep keyway. Ensure the existing chain is #25 single-pitch and that 0.515 in of hub projection clears adjacent hardware. The 1045 steel construction suits standard industrial environments.

Highlights

  • Precision fit with 28 teeth for #25 chain
  • 3/8 in plain bore with 3/64 in keyway depth
  • 1045 steel construction with black oxide finish
  • 233 in pitch diameter ensures smooth engagement
  • Includes set screws for secure shaft mounting

Specifications

No published specifications for this item yet.

Questions about this item

What chain pitch and number of strands does the 25B28 sprocket require?

The sprocket is made for 1/4 inch pitch, single-strand 25 chain with 28 teeth.

Will the 3/8 inch plain bore with 3/64 inch keyway depth fit my existing 3/8 inch keyed shaft?

Yes, the bore is 3/8 inch plain with a 3/64 inch deep, 3/32 inch wide keyway and includes set screws for a 3/8 inch keyed shaft.

How can I verify the sprocket is seated correctly after installation?

Measure the outside diameter at 2.369 in and pitch diameter at 2.233 in, confirm the hub projection is 0.515 in, and check that the chain engages all 28 teeth smoothly.

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