Precision Brand 56502 Mill Stock Key Stock 3/16x3/16x12 in 6 Pc

Product Description

The PRECISION BRAND 56502 is a mill stock key stock bar used to secure rotating components such as gears, pulleys, and sprockets to shafts in mechanical drive assemblies. Measuring 3/16 inch wide by 3/16 inch tall by 12 inches long, this square-profile key stock is cut from low-carbon steel meeting ASTM A108 and carries a Rockwell B80-90 hardness rating. The plain finish is ready for installation as-cut or can be finish-ground to tolerance on-site. Each package contains six pieces, making it practical for stocking a service van or shop for recurring mechanical repairs.

Mill stock key stock is used across a wide range of industrial and mechanical service applications including HVAC equipment drives, pump shafts, fan assemblies, compressor couplings, and general power transmission equipment. Machinists, millwrights, and industrial maintenance technicians use this stock material when a finished key needs to be cut to a custom length or when a direct OEM-length replacement is required. The 3/16 inch square profile fits standard keyways machined to that dimension in both inch-series shaft and hub combinations.

Key Features

• Low-carbon steel construction per ASTM A108 for consistent machinability and weldability
• Rockwell B80-90 hardness provides adequate shear strength for standard drive applications
• 3/16 inch square cross-section fits standard 3/16 inch keyways in shafts and hubs
• 12-inch length allows on-site cutting to required finished length
• Plain finish accepts further machining, grinding, or coating as needed
• Six-piece pack supports job stocking and repetitive maintenance work

Compatibility

Designed as an OEM-style replacement mill stock key for mechanical drive assemblies using a 3/16 inch square keyway profile in inch-series shafting.

Installation Notes

Key stock installation is typically performed by millwrights, machinists, or qualified industrial maintenance technicians. De-energize and lock out all equipment before removing or installing any drive components. Cut key stock to finished length using an appropriate metal-cutting saw or grinder, then deburr all edges before fitting into the keyway to avoid shaft or hub damage. Verify shaft and hub keyway dimensions before installation to confirm proper fit and engagement.