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Tritan

Tritan 40BS21H 3/4 Roller Chain Sprocket Finished Bore Keyway SS 40 collectible

SKU CH-VBVP-42K39

A 21-tooth steel sprocket with a finished 3/4-inch bore, keyway, and two set screws for chain number 40

  • TypeBearings, V-belts & Power Transmission Equipment
  • ColorTransparent
  • Precision power transmission with 21-tooth steel sprocket
  • Secure keyway fit using 3/16 in width and two set screws
  • Durable black oxide finish resists corrosion on 40 chain
  • Exact 3/4 in bore matches shaft without adapters
  • Compact 3.62 in outside diameter fits tight installations

A 21-tooth steel sprocket for 40-series roller chain

This finished-bore sprocket fits single-strand 40 chain with a 1/2-inch pitch and presents a 3/4-inch bore that already includes a 3/16-inch keyway. Two set screws lock the hub to the shaft without additional machining. The black-oxide coating protects the steel from surface corrosion during storage and light service.

Mounts directly on a 3/4-inch shaft to drive

The 3.355-inch pitch diameter and 3.62-inch outside diameter sit on a 2 3/4-inch hub that projects 0.716 inch through the bore, leaving one face clear for guards or adjacent components. Because the bore is fixed at 3/4 inch, the sprocket cannot accommodate larger or smaller shafts without replacement. Builders needing a different bore size or a double-strand hub must select another part.

Supplied with two set screws and a machined keyway

The included set screws and 3/16-inch keyway eliminate the need to source separate fasteners or cut a key seat, reducing assembly time on conveyors, packaging equipment or farm drives. No lubricant, chain or tensioning hardware is bundled, so those items must be ordered separately to complete the drive.

Highlights

  • Precision power transmission with 21-tooth steel sprocket
  • Secure keyway fit using 3/16 in width and two set screws
  • Durable black oxide finish resists corrosion on 40 chain
  • Exact 3/4 in bore matches shaft without adapters
  • Compact 3.62 in outside diameter fits tight installations

Specifications

BrandTRITAN
TypeBearings, V-belts & Power Transmission Equipment
ColorTransparent

Questions about this item

How many teeth does the 40BS21H sprocket have before chain stretch becomes the limiting factor?

The sprocket has 21 teeth, and chain stretch under sustained load will be the first wear limit you encounter.

Does the steel hub with black oxide finish run hot or noisy during continuous operation?

The 2 3/4 in steel hub with black oxide finish adds mass that dampens vibration, so heat and noise stay low in all-day use.

What shaft size and keyway must my equipment already have to mount this sprocket?

Your shaft must be 3/4 in diameter with a 3/16 in keyway to match the finished bore and included set screws.

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