Browning 1026640 Single Groove Sheave 4.95 in Od Cast Iron

Product Description

The BROWNING 1026640 is a finished bore single groove sheave designed for V-belt drive applications in mechanical power transmission systems. Machined from cast iron, this sheave features a 0.5 inch bore diameter and a 4.95 inch outer diameter, making it a direct-fit component for light-duty to medium-duty belt drive assemblies. The finished bore arrives ready for installation without additional machining. With a 4L/A belt pitch diameter of 4.7 inches and a 3L belt pitch diameter of 4.36 inches, this sheave accommodates two common V-belt profiles. It is installed by HVAC technicians, millwrights, and mechanical contractors working on blower and fan drive systems.

This sheave is suited for residential and light commercial HVAC blower assemblies, exhaust fan drives, and general industrial belt drive configurations where a single groove cast iron pulley is specified. The 0.75 inch face width and finished bore construction allow for straightforward shaft installation with a standard setscrew or bushing arrangement. Contractors replacing worn or damaged sheaves on belt-driven air handlers and unit ventilators will find this a compatible OEM-style option where a 0.5 inch bore and roughly 4.95 inch OD are required.

Key Features

• Finished bore ships ready to install with no additional machining required
• Cast iron construction provides durability in continuous-duty belt drive service
• Single groove design accommodates standard 3L and 4L/A profile V-belts
• 4.7 inch pitch diameter for 4L/A belts and 4.36 inch pitch diameter for 3L belts
• 0.75 inch face width suits compact drive configurations
• Overall bore length of 1-5/32 inches supports secure shaft engagement

Compatibility

Designed as an OEM-style replacement single groove sheave for belt-driven blower and fan assemblies requiring a 0.5 inch finished bore and a 4.95 inch outer diameter with 3L or 4L/A V-belt groove profiles.

Installation Notes

Installation is typically performed by a licensed HVAC technician or qualified mechanical contractor. Disconnect and lock out all electrical power to the drive system before removing the existing sheave or belt. Verify shaft diameter and belt profile match the sheave specifications before installation. Ensure proper belt tension and sheave alignment after installation to prevent premature wear and vibration.