Browning 1128297 Finished Bore Sprocket 18T 1/2in Pitch

Product Description

The BROWNING 1128297 is a finished bore roller chain sprocket designed for use with No. 40 roller chain in power transmission applications. Machined from steel, this sprocket features 18 teeth, a 1/2 inch chain pitch, and a finished bore diameter of 3/4 inch. The outside diameter measures 3.14 inches and the hub diameter is 2.391 inches. It ships ready to mount to a shaft without additional machining, making it a straightforward replacement or new-install component for conveyor drives, HVAC equipment drives, pump drives, and similar light-to-medium duty mechanical systems. The part weighs 1.14 pounds.

This sprocket is suited for residential and commercial mechanical systems where No. 40 roller chain drives are used. Common applications include blower and fan drives, pump drive assemblies, conveyor systems, and other equipment requiring a compact, finished bore sprocket. Because the bore is already finish-machined to 3/4 inch, installation is direct onto a matching shaft without additional lathe work. HVAC technicians, millwrights, and mechanical contractors encounter this type of sprocket in equipment room and rooftop unit drive train assemblies.

Key Features

• Finished bore eliminates additional machining — installs directly onto a 3/4 inch shaft
• 18-tooth configuration for No. 40 roller chain with 1/2 inch pitch
• Steel construction for durability in mechanical drive applications
• 3.14 inch outside diameter and 2.391 inch hub diameter
• Lightweight at 1.14 pounds for easier handling during installation

Compatibility

Designed as an OEM-style replacement or direct-install finished bore sprocket for mechanical drive assemblies using No. 40 roller chain with 1/2 inch pitch and a 3/4 inch drive shaft.

Installation Notes

Installation is typically performed by a licensed mechanic, millwright, or qualified HVAC technician. De-energize and lock out the drive system before removing or installing any sprocket. Verify shaft diameter matches the 3/4 inch finished bore before mounting, and confirm proper chain alignment and tension after installation per the equipment manufacturer guidelines. Consult applicable ANSI and OSHA standards for mechanical drive safety requirements.