Browning 1028265 Single Groove Sheave 4-1/4in Od Cast Iron

Product Description

The BROWNING 1028265 is a finished bore single groove sheave designed for use with V-belt drive systems in HVAC, industrial fan, and blower applications. Cast iron construction provides the rigidity and wear resistance required for continuous-duty belt drive service. The sheave features a 5/8 inch finished bore, a 4-1/4 inch outer diameter, and a 3.5 inch pitch diameter for 4L or A-type belts. The groove is precision-machined to maintain belt alignment and reduce drive slip. Licensed contractors and mechanical tradespeople install this component when replacing worn sheaves or reconfiguring drive ratios on belt-driven equipment.

This sheave is suited for belt drive assemblies found in residential and light commercial HVAC air handlers, belt-drive blower sections, ventilation fans, and general-purpose industrial machinery. It is sized for 4L or A-series V-belts with a 3.5 inch pitch diameter and an overall through-bore length of 1-5/32 inches. The finished bore ships ready for direct shaft installation without additional machining, making it a practical drop-in replacement in field service situations.

Key Features

• Cast iron construction for durability in continuous-duty belt drive applications
• Finished 5/8 inch bore — no machining required before installation
• Single groove design accepts 4L or A-series V-belts
• 3.5 inch pitch diameter for accurate drive ratio calculations
• 4-1/4 inch outer diameter with 7/8 inch face width
• Overall bore length of 1-5/32 inches for positive shaft engagement

Compatibility

Designed as an OEM-style replacement sheave for belt-driven blowers and fans using 4L or A-series V-belts with a 3.5 inch pitch diameter and a 5/8 inch shaft.

Installation Notes

Installation should be performed by a qualified HVAC technician or mechanical tradesperson. Disconnect and lock out all electrical power to the unit before removing the existing sheave or belt. Verify shaft diameter and keyway dimensions match the finished bore before mounting. Confirm belt tension and alignment with a straightedge or laser alignment tool after installation to prevent premature belt or bearing wear.