Precision Brand 56506 Mill Stock Key Stock 7/16x7/16x12 in

Product Description

The PRECISION BRAND 56506 is a mill stock key stock bar made from low-carbon steel, designed to transmit torque between a shaft and a hub in mechanical drive applications. Each bar measures 7/16 inches wide by 7/16 inches high by 12 inches long with a plain finish and no secondary machining. The material meets ASTM A108 specification and carries a Rockwell B80-90 hardness rating, making it suitable for moderate-duty power transmission setups. This pack includes four pieces. Machinists, maintenance technicians, and millwrights cut these bars to length on-site to fit keyways in pulleys, gears, sprockets, and couplings.

Mill stock key stock is used wherever a standard keyed shaft connection is needed in industrial and commercial mechanical systems. Typical applications include conveyor drives, pump shafts, fan assemblies, and general power transmission equipment. Because the stock comes in a full 12-inch length, a single bar can often yield multiple cut keys depending on the finished key length required. The plain finish leaves the surface ready for deburring and fitting without additional prep steps.

Key Features

• Low-carbon steel construction meets ASTM A108 material specification
• Rockwell B80-90 hardness provides consistent machinability and adequate shear strength for moderate-duty keyway applications
• Square 7/16 x 7/16 inch cross-section suits standard keyway slots of the same nominal size
• 12-inch bar length allows on-site cutting to required finished key dimensions
• Plain finish requires no removal of coating before fitting
• Pack of 4 bars reduces downtime by keeping spare stock on hand

Compatibility

Designed as an OEM-style replacement or maintenance stock for standard 7/16-inch square keyway shafts and hubs in industrial power transmission equipment.

Installation Notes

Key stock installation is typically performed by a machinist or maintenance technician. Shut down and lock out the drive system before removing or installing any key components per OSHA lockout/tagout procedures. Cut the bar to the required length using a bandsaw or hacksaw, then deburr all edges before fitting into the keyway. Do not force an oversized key into a keyway, as this can damage the shaft or hub bore.