Browning 1026574 Single Groove Sheave 1 in Bore Cast Iron

Product Description

The BROWNING 1026574 is a finished bore single groove sheave designed for V-belt drive systems in HVAC, industrial, and mechanical power transmission applications. Manufactured from cast iron, this sheave features a 1 inch finished bore and a 4.45 inch outer diameter. The pitch diameter measures 4.2 inches for 4L or A belt types and 3.86 inches for 3L belt types. The overall length through bore is 1-5/32 inches. It is installed by HVAC technicians and mechanical contractors on fan and blower assemblies where precise belt alignment and durable pulley construction are required.

This sheave is suited for residential and light commercial HVAC blower assemblies, exhaust fans, and other belt-driven equipment requiring a single groove configuration. The finished bore means the hub is machined to final dimension and ready to mount on a 1 inch shaft without additional machining. Applications typically include air handling units, furnace blower sections, and ventilation fan drives where 3L, 4L, or A-section V-belts are used.

Key Features

• Finished bore at 1 inch — ready to install on a 1 inch shaft without additional machining
• Single groove profile accepts 3L, 4L, and A-section V-belts
• Cast iron construction for durability and resistance to wear in continuous-duty belt drive service
• 4.2 inch pitch diameter for 4L or A belt types; 3.86 inch pitch diameter for 3L belt types
• 4.45 inch outer diameter with 1-5/32 inch overall length through bore

Compatibility

Designed as an OEM-style replacement single groove sheave for belt-driven blower and fan assemblies using 3L, 4L, or A-section V-belts with a 1 inch shaft bore requirement.

Installation Notes

Installation should be performed by a qualified HVAC technician or mechanical contractor. Disconnect and lock out all electrical power to the drive system before removing or installing any sheave. Verify shaft diameter matches the 1 inch finished bore before mounting, and secure the sheave with a properly sized key and setscrew. After installation, check belt tension and alignment per the belt and drive manufacturer guidelines before returning the system to service.