Browning 1028281 Single Groove Sheave 4-1/4 in Od Cast Iron

Product Description

The BROWNING 1028281 is a finished bore single groove sheave designed for use with B-section and A-section V-belts in belt-driven power transmission applications. It features a 4-1/4 inch outer diameter, a 7/8 inch finished bore, and a cast iron construction that provides durability under continuous load. The belt pitch diameter measures 3.9 inches, and the pitch diameter for 4L or A-type belts is 3.5 inches. The bore is finished to tolerance, meaning no secondary machining is required before mounting. This sheave is installed by HVAC technicians, millwrights, and mechanical contractors working on fan and blower drive systems.

This sheave is a standard replacement or new-installation component for single V-belt drive setups found in residential and light commercial HVAC systems, ventilation fans, blowers, and general industrial equipment. It is suited for applications where a B-section or A-section belt connects a motor shaft to a fan or blower shaft. The 7/8 inch finished bore accommodates motor or driven-shaft sizes common in fractional and small integral horsepower equipment. The overall length through the bore measures 1-5/32 inches, making it compatible with standard mounting arrangements on short shaft extensions.

Key Features

• Single groove design accepts standard B-section and A-section V-belts
• 4-1/4 inch outer diameter with a 3.9 inch belt pitch diameter
• 7/8 inch finished bore — no machining required before installation
• Cast iron construction for strength and wear resistance under belt tension
• 1-5/32 inch overall length through bore suits standard shaft configurations
• UNSPSC code 31171804 for procurement system compatibility

Compatibility

Designed as an OEM-style replacement single groove sheave for B-section and A-section V-belt drive systems commonly found in residential and light commercial HVAC blower and fan assemblies.

Installation Notes

Installation should be performed by a qualified HVAC technician or mechanical contractor. Disconnect and lock out all power to the drive system before removing the existing sheave or installing this component. Ensure the shaft diameter matches the 7/8 inch finished bore and use a properly sized shaft key and setscrew to secure the sheave. Check belt alignment and tension after installation to prevent premature belt or bearing wear.