Browning 1027580 Single Groove Sheave 1in Bore 12.25in Od

Product Description

The BROWNING 1027580 is a finished bore single groove sheave designed for V-belt drive systems in HVAC, industrial, and mechanical power transmission applications. The sheave features a 1 inch finished bore diameter and a 12.25 inch outer diameter, machined from cast iron for durability and dimensional stability under continuous load. The groove width measures 0.75 inches. With a pitch diameter of 12.0 inches for 4L and A-series belts, this sheave delivers accurate belt tracking and consistent drive performance. HVAC technicians and mechanical contractors install this component on fan assemblies, blowers, and belt-driven equipment requiring a single groove drive configuration.

This sheave is suited for residential and light commercial HVAC fan and blower applications, as well as general industrial belt drive systems. The finished bore is ready for installation onto a 1 inch shaft without additional machining. The cast iron construction handles the rotational stress and heat typical of continuously operating motor and fan drive assemblies. Technicians working on supply air blowers, exhaust fans, and centrifugal fan units will find this sheave a direct fit where a single groove, 1 inch bore pulley is specified.

Key Features

• Finished bore at 1 inch — ready for direct shaft installation with no additional machining
• 12.25 inch outer diameter with 12.0 inch pitch diameter for 4L and A-series V-belts
• Pitch diameter of 11.66 inches for 3L-series belts
• Single groove design for straightforward single-belt drive configurations
• Cast iron construction provides rigidity and resistance to wear under continuous operation
• Bore length through hub is 1-15/32 inches for adequate shaft engagement

Compatibility

Designed as an OEM-style replacement or new-installation sheave for single groove V-belt drive systems using 4L, A-series, or 3L-series belts on 1 inch diameter shafts.

Installation Notes

Installation should be performed by a qualified HVAC technician or millwright following applicable mechanical and electrical codes. Disconnect and lock out all power to the drive system before removing or installing any sheave or belt component. Ensure the shaft is clean and free of burrs before sliding the finished bore sheave into position, and verify sheave alignment with a straightedge before tensioning the belt. Do not operate the drive without proper belt guards in place per applicable safety standards.