Browning 1025931 Single Groove Sheave 0.75 in Bore Cast Iron

Product Description

The BROWNING 1025931 is a finished bore single groove sheave designed for V-belt drive applications in HVAC, industrial, and mechanical systems. Cast from iron, this sheave features a 0.75-inch bore diameter and a 2.2-inch outer diameter, making it a compact, durable component suited for light-duty to medium-duty belt drive setups. The groove accepts standard B-section or A-section belts with a pitch diameter of 2.0 inches, and also accommodates 3L-section belts with a 1.66-inch pitch diameter. The finished bore eliminates the need for additional machining, allowing direct installation onto a shaft. HVAC technicians, millwrights, and mechanical contractors typically install this component during blower and fan drive assemblies.

This sheave is used in single-belt drive configurations found in residential and light commercial HVAC blower assemblies, ventilation fans, and small mechanical power transmission setups. Its compact outer diameter and standard bore sizing make it a common replacement or upgrade component when rebuilding fan drive systems. The 0.75-inch finished bore fits standard shaft sizes commonly encountered in these applications. The overall length through bore is 15/16 inch, and the groove width is 21/32 inch, confirming fitment with standard A, B, and 4L belt profiles.

Key Features

• Finished bore at 0.75 inches — no additional machining required for installation
• Cast iron construction for durability in belt drive environments
• Single groove accepts A-section, B-section, and 4L V-belts
• Belt pitch diameter of 2.0 inches for A and 4L belt types
• Belt pitch diameter of 1.66 inches for 3L belt type
• Groove width of 21/32 inch matches standard V-belt profiles

Compatibility

Designed as an OEM-style replacement single groove sheave for V-belt drive systems using A-section, B-section, 4L, or 3L belts with a 0.75-inch shaft bore.

Installation Notes

Installation is typically performed by a licensed HVAC technician or qualified millwright. Disconnect and lock out all electrical power to the equipment before removing the existing sheave or belt. Use a standard sheave or gear puller to remove the old component without damaging the shaft. Verify shaft diameter, belt section, and center-to-center distance before final installation to ensure proper belt tension and alignment.