18-Tooth #41 Roller Chain Sprocket – 1" Bore, 1/4" Keyway

41B18 18-Tooth #41 Roller Chain Sprocket – 1" Bore, 1/4" Keyway

The 41B18 is an 18-tooth roller chain sprocket designed for ANSI #41 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, gate operators, jackshaft assemblies, chain-drive systems, and other compatible power-transmission applications.

Product Features

• 18-tooth roller chain sprocket

• Designed for ANSI #41 roller chain

• 1" finished bore

• 1/4" keyway

• Designed for keyed shaft installation

• Set screws included

• Single-strand sprocket

• Suitable for commercial garage door and gate operator applications

• Useful for replacement and custom chain-drive assemblies

Specifications

• Model / Size: 41B18

• Product Type: Roller Chain Sprocket

• Number of Teeth: 18

• Chain Size: #41

• Chain Pitch: 1/2"

• Bore: 1"

• Keyway: 1/4"

• Number of Strands: Single

• Set Screws: Included

• Application: Garage 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

18-Tooth Configuration

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

Changing from an 18-tooth sprocket to a sprocket with a different number of teeth can change shaft speed, torque, and overall equipment 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 all four critical specifications:

• Chain Size: #41

• Number of Teeth: 18

• Shaft Diameter: 1"

• Keyway: 1/4"

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

A similar-looking 50B18 sprocket is designed for #50 chain and is not the same as this 41B18 sprocket.

#41 Roller Chain Compatibility

This sprocket is designed specifically for ANSI #41 roller chain, which uses a 1/2" pitch.

It should not be substituted for sprockets designed for:

• #40 chain

• #50 chain

• #60 chain

• Other incompatible roller-chain sizes

Always match the chain and sprocket size.

Keyed Shaft Connection

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

This helps transfer torque through the keyed connection rather than relying only on set-screw friction.

Package Contents

• 1 – 41B18 18-Tooth #41 Chain Sprocket

• Set screws included

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.