50B30 30-Tooth #50 Roller Chain Sprocket – 1" Bore, 1/4" Keyway

The 50B30 is a heavy-duty 30-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 power-transmission applications.

Product Features

• 30-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 systems

• Replacement sprocket for compatible garage door and gate operator assemblies

Specifications

• Model / Size: 50B30

• Product Type: Roller Chain Sprocket

• Number of Teeth: 30

• Chain Size: ANSI #50

• Chain Pitch: 5/8"

• Bore: 1"

• Keyway: 1/4" × 1/8"

• Number of Strands: Single

• Pitch Diameter: Approximately 5.979"

• 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

30-Tooth Configuration

Sprocket tooth count directly affects the operating ratio of a chain-drive system.

A 30-tooth sprocket may be used as either a drive or driven sprocket depending on the equipment design. Changing sprocket tooth count can alter shaft speed, available torque, and overall system performance.

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

Compatibility & Matching

Before ordering, verify:

• Chain Size: #50

• Number of Teeth: 30

• Shaft Diameter: 1"

• Keyway: 1/4"

Do not select a replacement sprocket based only on outside diameter or tooth count.

A similar-looking sprocket designed for #40 or #41 roller chain is not interchangeable with this 50B30.

#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.

The keyed connection transfers torque between the shaft and sprocket and helps prevent the sprocket from rotating independently on the shaft.

Package Contents

• 1 – 50B30 30-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.