Browning 1026491 Single Groove Sheave 0.875 in Bore

Product Description

The BROWNING 1026491 is a finished bore single groove sheave designed for belt-driven HVAC blower and fan applications. Manufactured from cast iron, this sheave accepts a 0.875 inch bore and measures 4.25 inches in outside diameter with a face width of 0.75 inches. The finished bore comes ready to install without additional machining. With a pitch diameter of 4.0 inches for 4L and A belt types, it delivers predictable speed ratios and consistent belt tracking in demanding mechanical drive systems. HVAC technicians and millwrights rely on cast iron sheaves like this for their dimensional stability and long service life in continuous-duty fan applications.

This sheave is suited for residential and light commercial HVAC systems where belt-driven blowers or condenser fan assemblies require a single groove drive pulley. Typical installations include air handling units, furnace blowers, and exhaust fan assemblies that use 4L or A-series V-belts. The overall through-bore length of 1.156 inches provides adequate hub depth for standard keyed shaft mounting. It is also compatible with 3L belt types, which have a pitch diameter of 3.66 inches on this sheave, giving technicians flexibility when sourcing replacement belts in the field.

Key Features

• Finished bore at 0.875 inches — installs directly without machining
• Cast iron construction for dimensional stability and long service life
• Single groove design compatible with 4L, A-series, and 3L V-belts
• 4.0 inch pitch diameter for 4L and A belt types
• 3.66 inch pitch diameter for 3L belt types
• 4.25 inch OD with 0.75 inch face width suits compact drive envelopes

Compatibility

Designed as an OEM-style replacement single groove sheave for belt-driven HVAC blower and fan assemblies using 4L, A-series, or 3L V-belts on 0.875 inch diameter shafts.

Installation Notes

Installation is typically performed by a licensed HVAC technician or millwright. Disconnect and lock out all electrical power to the unit before removing or installing any drive components. Verify shaft diameter and keyway dimensions before mounting, and ensure the sheave is properly aligned with the mating pulley using a straightedge or laser alignment tool to prevent premature belt and bearing wear. Confirm correct belt tension per the belt manufacturer specifications after installation.