Browning 1028091 Single Groove Sheave 3.55in Od Cast Iron

Product Description

The BROWNING 1028091 is a finished bore single groove sheave designed for use with B-section and A-section V-belts in belt-drive power transmission systems. The sheave features a 3.55-inch outer diameter and a 0.75-inch finished bore, ready for direct shaft installation without additional machining. Cast iron construction provides the durability and mass required for reliable torque transfer in HVAC blower drives, fan assemblies, and general industrial belt drive applications. The groove width measures 0.875 inches, and the overall length through the bore is 1-5/32 inches. Licensed HVAC technicians, millwrights, and mechanical contractors are the primary installers of this component.

This sheave is suited for residential and light commercial HVAC systems where a single-groove belt drive connects a motor shaft to a blower or fan shaft. It is compatible with 4L-type and A-type V-belts, with a pitch diameter of 2.8 inches for those belt sections. Typical applications include air handler blower assemblies, condenser fan drives, and belt-driven exhaust fans. The finished bore eliminates the need for on-site boring, making direct installation straightforward in standard replacement scenarios.

Key Features

• Finished bore at 0.75 inches — no additional machining required for standard shaft sizes
• Cast iron construction for high-mass, durable torque transfer
• Compatible with 4L and A-section V-belts with a 2.8-inch pitch diameter
• 3.55-inch outer diameter suited for compact belt drive configurations
• Single groove design for straightforward single-belt drive systems
• Groove width of 0.875 inches matches standard B and A belt profiles

Compatibility

Designed for use with 4L-type and A-type V-belts. Suitable as an OEM-style replacement single groove sheave in residential and light commercial belt-drive HVAC blower and fan applications requiring a 0.75-inch bore and 3.55-inch outer diameter.

Installation Notes

Installation should be performed by a qualified HVAC technician or mechanical contractor. Disconnect and lock out all power to the unit before removing or installing the sheave. Ensure the shaft and bore surfaces are clean and free of burrs before fitting. Align the sheave with the mating pulley and verify belt tension according to the equipment manufacturer's specifications before returning the system to service.