50B24 24-Tooth #50 Roller Chain Sprocket – 1" Bore, 1/4" Keyway

The 50B24 is a heavy-duty 24-tooth roller chain sprocket designed for ANSI #50 single-strand roller chain and compatible 1" keyed shafts.

Its finished 1" bore and 1/4" keyway provide a positive mechanical connection between the sprocket and shaft, making it suitable for commercial garage door operators, industrial overhead door systems, gate operators, jackshaft assemblies, chain-reduction systems, and other compatible mechanical drive applications.

Product Features

• 24-tooth roller chain sprocket

• Designed for ANSI #50 roller chain

• 1" finished bore

• 1/4" × 1/8" keyway

• Single-strand sprocket

• Designed for keyed shaft installation

• Suitable for commercial and industrial drive applications

• Replacement sprocket for compatible operator assemblies

• Suitable for garage door, gate, and mechanical power-transmission systems

Specifications

• Model / Size: 50B24

• Product Type: Roller Chain Sprocket

• Number of Teeth: 24

• Chain Size: ANSI #50

• Chain Pitch: 5/8"

• Bore: 1"

• Keyway: 1/4" × 1/8"

• Number of Strands: Single

• Application: Commercial Door, Gate & Mechanical Drive Systems

Common Applications

Suitable for compatible:

• Commercial garage door operators

• Industrial overhead door operators

• Gate operators

• Jackshaft drive systems

• Chain-reduction assemblies

• Shaft-driven equipment

• Mechanical power-transmission systems

24-Tooth Configuration

Sprocket tooth count affects the speed and mechanical ratio of a chain-drive system.

A 24-tooth sprocket may be used as either a drive or driven sprocket depending on the equipment design. Changing tooth count can alter shaft speed, torque, and overall system performance.

For replacement applications, match the original tooth count unless the system has specifically been engineered for a different drive ratio.

Compatibility & Matching

Before ordering, verify:

• Chain Size: #50

• Number of Teeth: 24

• Shaft Diameter: 1"

• Keyway: 1/4"

Do not select a sprocket based only on tooth count or appearance.

Important: A 41B24 uses #41 roller chain and is not interchangeable with this 50B24 sprocket.

#50 Roller Chain Compatibility

This sprocket is specifically designed for ANSI #50 roller chain, which uses a 5/8" pitch.

It should not be substituted for sprockets designed for:

• #40 chain

• #41 chain

• #60 chain

• Other incompatible roller-chain sizes

Always match the chain size to the sprocket.

Keyed Shaft Connection

The 1/4" keyway accepts a compatible shaft key to mechanically connect the sprocket to a 1" keyed shaft.

This keyed connection transfers torque between the shaft and sprocket without relying solely on set-screw friction.

Package Contents

• 1 – 50B24 24-Tooth #50 Chain Sprocket

Roller chain, shaft, shaft key, bearings, operator, and other drive components are sold separately.

Important Installation Note

Disconnect electrical power and properly secure the door or driven equipment before servicing any operator or chain-drive assembly.

Inspect the roller chain, shaft key, shaft, bearings, and mating sprockets for wear during replacement. Proper sprocket alignment and chain tension are important for smooth operation and long component life.