Browning 1128388 Finished Bore Sprocket 21T 1/2in Pitch

Product Description

The BROWNING 1128388 is a finished bore roller chain sprocket designed for use with ANSI No. 40 chain at a 1/2 inch pitch. Machined from steel, this sprocket features 21 teeth, a 3/4 inch finished bore diameter, and a 2.766 inch hub diameter. The outside diameter measures 3.62 inches. Because the bore is already finished to size at the factory, no secondary machining is required before installation. It is suited for light-to-medium duty power transmission applications in conveyor, drive, and mechanical systems where a 40-series chain is specified.

This sprocket is used in industrial and commercial power transmission assemblies that rely on ANSI No. 40 roller chain. Typical applications include conveyor drives, agitator drives, pump drives, and general machinery in manufacturing, HVAC mechanical rooms, and light industrial environments. The 21-tooth count provides a moderate gear ratio for speed and torque management across a wide range of drive configurations. Installation is performed by millwrights, maintenance technicians, and mechanical contractors.

Key Features

• Finished bore at 3/4 inch — no additional machining required prior to installation
• 21-tooth steel sprocket for ANSI No. 40 roller chain at 1/2 inch pitch
• Steel construction for durability in industrial drive environments
• Hub diameter of 2.766 inches and outside diameter of 3.62 inches for consistent chain alignment
• Sold individually — package quantity of 1

Compatibility

Designed for use with ANSI No. 40 roller chain with a 1/2 inch pitch. The finished bore is fixed at 3/4 inch, which is both the minimum and maximum bore diameter for this sprocket.

Installation Notes

Installation is typically performed by a millwright or qualified mechanical technician. Disengage and lock out the drive system before mounting or removing sprockets. Secure the sprocket to the shaft using an appropriate keyway, set screw, or locking collar as required by the application. Verify chain tension and sprocket alignment after installation to prevent premature wear.