Browning 1028307 Single Groove Sheave 1-1/8 in Bore

Product Description

The BROWNING 1028307 is a finished bore single groove sheave designed for V-belt drive systems in commercial and industrial mechanical applications. The sheave features a 1-1/8 inch bore diameter and a 4-1/4 inch outer diameter, with a belt groove pitch diameter of 3.5 inches for 4L or A-type belts. Constructed from cast iron, this sheave delivers the rigidity and wear resistance required for sustained belt drive operation. The overall length through the bore measures 1-5/32 inches, and the groove face width is 7/8 inch. Installation is handled by millwrights, HVAC mechanics, or maintenance technicians working on fan and blower assemblies.

This sheave is suited for single V-belt drive configurations found in HVAC blower systems, exhaust fans, and light-to-medium industrial equipment. The finished bore means the part is ready to install on a matching shaft without additional machining. It accepts 4L or A-profile V-belts, which are among the most commonly used fractional horsepower belt types in residential and light commercial HVAC fan drives and general equipment applications.

Key Features

• Finished 1-1/8 inch bore — no additional machining required for matching shaft installation
• 4-1/4 inch outer diameter with 3.5 inch pitch diameter for 4L or A-type V-belts
• Single groove design for straightforward single-belt drive configurations
• Cast iron construction for rigidity and long service life under continuous belt loading
• Groove face width of 7/8 inch suits standard fractional horsepower belt profiles
• UNSPSC Code 31171804 for procurement classification

Compatibility

Designed as an OEM-style replacement or direct-install single groove sheave for V-belt drive systems using 4L or A-profile belts with a 1-1/8 inch shaft bore requirement.

Installation Notes

Installation is performed by qualified mechanics or HVAC technicians. De-energize all power to the driven equipment and lock out or tag out per site safety procedures before removing or installing any sheave. Verify shaft diameter matches the 1-1/8 inch finished bore before installation, and ensure proper belt tension and sheave alignment after mounting to prevent premature belt or bearing wear. A setscrew or key may be required to secure the sheave to the shaft — confirm the drive assembly design before proceeding.