Browning 1026681 Single Groove Sheave 1in Bore 5.1in Od

Product Description

The BROWNING 1026681 is a finished bore single groove sheave designed for V-belt drive systems in HVAC, industrial, and mechanical power transmission applications. Cast from iron for durability, this sheave features a 1 inch finished bore diameter and a 5.1 inch outer diameter, making it a direct-mount component ready for installation without additional machining. The groove accepts standard 4L or A profile belts with a pitch diameter of 4.7 inches, as well as 3L profile belts with a pitch diameter of 4.36 inches. The overall length through bore is 1-5/32 inches and the face width is 3/4 inch. Licensed HVAC technicians, millwrights, and mechanical contractors typically install this sheave in blower and fan drive assemblies.

This sheave is suited for use in belt-driven blower assemblies, air handling units, exhaust fans, and general-purpose power transmission setups found in both residential and light commercial settings. The finished bore eliminates the need for machining on-site, making it practical for field replacement of worn or damaged sheaves in existing drive systems. It is compatible with standard A and 4L cross-section V-belts as well as 3L belts, providing flexibility when sourcing replacement belts in the field.

Key Features

• Finished 1 inch bore — no additional machining required for installation
• 5.1 inch outer diameter with a 3/4 inch face width
• Single groove design accepts 4L or A profile V-belts (4.7 inch pitch diameter)
• Also compatible with 3L profile V-belts (4.36 inch pitch diameter)
• Cast iron construction for wear resistance and long service life
• Overall length through bore of 1-5/32 inches for straightforward shaft fitting

Compatibility

Designed as an OEM-style replacement single groove sheave for V-belt drive systems using standard 4L, A, or 3L cross-section belts. Verify bore diameter and belt groove profile match the existing drive system before installation.

Installation Notes

Installation should be performed by a qualified HVAC technician or millwright. Disconnect and lock out all power to the drive system before removing the existing sheave. Ensure the shaft diameter matches the 1 inch finished bore and that the new sheave is aligned with the mating sheave using a straightedge before tightening the set screw. Check belt tension and alignment after installation per the belt manufacturer guidelines.