Browning 1027259 Single Groove Sheave 1 Inch Bore Cast Iron

Product Description

The BROWNING 1027259 is a finished bore single groove sheave designed for V-belt drive systems in HVAC, industrial, and mechanical power transmission applications. Cast from iron, this sheave features a 1-inch finished bore and an 8.25-inch outer diameter, making it ready for direct shaft installation without additional machining. The groove accommodates standard B-section and A-section V-belts, with a belt pitch diameter of 8.0 inches for B/A-type belts. Licensed HVAC technicians and mechanical contractors install this component when servicing belt-driven blower assemblies, fan drives, and pump drives.

This sheave is suited for single-belt drive configurations in residential and light commercial HVAC air handling units, exhaust fans, and industrial blower systems. It is also compatible with 4L-series belts at an 8.0-inch pitch diameter and 3L-series belts at a 7.66-inch pitch diameter. The 1-15/32-inch overall length through bore provides a compact, stable mounting profile on standard motor or equipment shafts.

Key Features

• Finished bore at 1 inch — no machining required for standard shaft fitment
• Cast iron construction for durability in belt-drive applications
• Single groove design accepts B, A, and 4L V-belt profiles
• 8.0-inch pitch diameter for B-section and A-section belts
• 3L-section belt pitch diameter of 7.66 inches expands belt compatibility
• Compact 1-15/32-inch bore length suits tight drive configurations

Compatibility

Designed for use with B-section, A-section, 4L-series, and 3L-series V-belts in single-groove belt drive systems. Suitable as an OEM-style replacement sheave in belt-driven HVAC blower, fan, and pump drive applications requiring a 1-inch bore and 8.25-inch OD sheave.

Installation Notes

Installation is typically performed by licensed HVAC technicians or qualified mechanical contractors. Disconnect and lock out all power to the equipment before removing or installing the sheave. Ensure the shaft diameter matches the 1-inch finished bore and that set screws are tightened to shaft-flat or keyway per the equipment manufacturer's specifications. Align the sheave parallel to the mating pulley using a straightedge before tensioning the belt to the drive manufacturer's recommended deflection.