Browning 1028240 Single Groove Sheave 1-1/8 in Bore

Product Description

The BROWNING 1028240 is a finished bore single groove sheave designed for V-belt drive systems in HVAC, industrial, and mechanical power transmission applications. This cast iron sheave features a 1-1/8 inch bore diameter and a 3.95 inch outer diameter, making it a direct-use component that requires no additional machining before installation. With a pitch diameter of 3.2 inches for Type 4L or A belts and an overall length through bore of 1-5/32 inches, it delivers reliable belt engagement in standard fixed-speed drive configurations. Licensed HVAC technicians and mechanical tradespeople install this type of sheave on blower shafts, fan assemblies, and auxiliary drive systems.

This sheave is suited for single-belt drive setups in residential and light commercial HVAC systems, as well as general industrial equipment requiring a compact, finished bore pulley. The 7/8 inch groove width and cast iron construction make it appropriate for environments where durability and dimensional consistency are required. It is installed without modification to the bore, reducing bench time during service or retrofit work. Typical applications include air handler blower assemblies and belt-driven fan systems where a Type A or 4L V-belt is specified.

Key Features

• Finished bore at 1-1/8 inches — no machining required before installation
• Single groove design accepts Type 4L or A V-belts
• Pitch diameter of 3.2 inches for accurate belt speed ratio calculations
• Cast iron construction for durability in continuous-duty drive applications
• Groove width of 7/8 inches for proper belt seating and alignment
• Compact 3.95 inch OD fits standard HVAC blower and fan shaft configurations

Compatibility

Designed as an OEM-style replacement or direct-fit sheave for single-groove V-belt drives using Type 4L or A belts with a 1-1/8 inch shaft bore requirement.

Installation Notes

Installation should be performed by a qualified HVAC technician or mechanical tradesperson. Disconnect and lock out all electrical power to the drive system before removing or installing any sheave. Verify shaft and bore dimensions before mounting, and use a properly rated hub puller for removal of the existing sheave. Check belt tension and alignment after installation per the belt manufacturer's guidelines to prevent premature wear.