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Steel sprocket with 38 teeth, black oxide finish, 3/4 inch bore with keyway

Tritan

Tritan 40BS38 38-Tooth Sprocket 3/4 in Bore Keyway Collectible

SKU CH-35FG-6Z67V

Finished-bore steel sprocket with 38 teeth, 3/4 in keyway and set screws for 40 chain

  • TypeBearings, V-belts & Power Transmission Equipment
  • ColorTransparent
  • Fits 40 chain with 38 hardened teeth for smooth power transfer
  • 3/4 in fixed bore with 3/16 in keyway locks onto shaft without slip
  • Black oxide finish on steel resists corrosion in tough environments
  • Two set screws included secure hub firmly in place
  • 33 in outside diameter matches standard 40-series drive dimensions

Chain-drive sprocket for 40-series roller chain

This 38-tooth sprocket accepts 1/2-inch pitch single-strand roller chain and fits a 3/4-inch bore with a 3/16-inch wide by 3/32-inch deep keyway. Black-oxide finished steel construction includes two set screws for axial locking. It is aimed at maintenance technicians and hobbyists restoring or building chain-driven equipment.

Fixed bore limits interchangeability

The bore diameter is fixed at 3/4 inch with a maximum bore of 3/4 inch, so the sprocket cannot be re-bored for a different shaft size. Hub projection measures 0.716 inch and overall length through bore is 1 inch, which determines how far the sprocket sits from the mounting face. Pitch diameter is 6.054 inches and outside diameter is 6.33 inches, setting the chain wrap geometry for 40 chain.

Straightforward shaft mounting with set screws

Installation requires aligning the keyway with the shaft key, sliding the sprocket into position, and tightening the two included set screws against the shaft. The fixed bore means no bushings or adapters are needed, but the shaft must match the 3/4-inch diameter and keyway dimensions exactly. Misalignment or an undersized key can cause premature wear or slippage under load.

Highlights

  • Fits 40 chain with 38 hardened teeth for smooth power transfer
  • 3/4 in fixed bore with 3/16 in keyway locks onto shaft without slip
  • Black oxide finish on steel resists corrosion in tough environments
  • Two set screws included secure hub firmly in place
  • 33 in outside diameter matches standard 40-series drive dimensions

Specifications

BrandTRITAN
TypeBearings, V-belts & Power Transmission Equipment
ColorTransparent

Questions about this item

Which bore size and tooth count should I choose for a 40 chain?

This sprocket has a 3/4 in bore, 38 teeth and a 6.054 in pitch diameter, matching 40 chain with a 1/2 in pitch.

What does the 6.33 in outside diameter mean when the sprocket is mounted?

The 6.33 in outside diameter is the overall width of the 38-tooth steel sprocket, so the chain wraps a 6.054 in pitch circle.

How does the 3/4 in fixed bore with 3/16 in keyway limit installation?

The bore is fixed at 3/4 in with a 3/16 in wide, 3/32 in deep keyway and two set screws, so the shaft must match those dimensions exactly.

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