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Steel sprocket, 15 teeth, black oxide finish, 1 3/8 inch bore with keyway

Tritan

Tritan 50BS15H 1 3/8 in Sprocket 50 Chain 15 Teeth

SKU CH-78JP-0AQ32

A finished-bore steel sprocket with 15 teeth for 50 chain, 1 3/8 in bore, keyway and two set screws

  • TypeBearings, V-belts & Power Transmission Equipment
  • ColorTransparent
  • Precision power transmission with 15-tooth 50 chain sprocket
  • Secure shaft connection via 5/16 in keyway and dual set screws
  • Durable steel construction with black oxide finish resists wear
  • Exact fit for 1 3/8 in bore diameter applications
  • Compact 3.32 in outside diameter suits tight installations

Precision Power Transmission

The Tritan 50BS15H is a finished-bore sprocket built for single-strand 50 chain drives with a 5/8 inch pitch. Its 1 3/8 inch bore includes a 5/16 inch wide by 5/32 inch deep keyway and two set screws for a secure, anti-rotation fit on driven shafts. The steel body carries a black oxide finish for corrosion resistance in industrial environments.

Sustained Load Durability

Hardened steel teeth and a 2 3/8 inch hub diameter distribute chain tension evenly across the 15-tooth profile during continuous operation. The 1 inch length through bore and 0.657 inch hub projection provide rigid lateral support, reducing deflection when the drive runs under constant torque. Black oxide coating retains lubricant film longer than bare steel, limiting wear during extended duty cycles.

Upgrade From Worn or Plain Bore Sprockets

This unit replaces sprockets showing hook wear, elongated pitch, or stripped keyways on the same 50 chain size. The factory-machined keyway and dual set screws eliminate the machining step required for plain-bore versions, cutting installation time. The jump is worth it when downtime for re-boring exceeds the cost of a direct-fit replacement.

Highlights

  • Precision power transmission with 15-tooth 50 chain sprocket
  • Secure shaft connection via 5/16 in keyway and dual set screws
  • Durable steel construction with black oxide finish resists wear
  • Exact fit for 1 3/8 in bore diameter applications
  • Compact 3.32 in outside diameter suits tight installations

Specifications

BrandTRITAN
TypeBearings, V-belts & Power Transmission Equipment
ColorTransparent

Questions about this item

How much heat does the 15-tooth steel sprocket generate when running continuously?

Steel sprockets produce negligible heat under normal chain speeds; the 3.32 in outside diameter and 1 in length through bore provide adequate surface area for passive cooling.

What shaft size and key does the 1 3/8 in bore with 5/16 in keyway require?

The fixed bore fits a 1 3/8 in shaft; the 5/32 in deep by 5/16 in wide keyway matches a standard 5/16 in square key.

Will this 50-chain sprocket mesh with an older 50-chain roller chain I already own?

Yes — it is cut for 5/8 in pitch single-strand chain number 50, so any standard ANSI 50 chain will engage the 15 teeth correctly.

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