Precision Brand 15300 Key Stock Zinc 5/16x1/4x12 in 6 Piece

Product Description

The PRECISION BRAND 15300 is a zinc-finished, low-carbon steel key stock used to secure rotating components such as gears, pulleys, and sprockets to shafts in mechanical drive systems. Each piece measures 5/16 inches wide, 1/4 inch tall, and 12 inches long, conforming to ASTM A108 material specification. Hardness is rated at Rockwell B80-90, providing adequate shear strength for light-to-medium duty power transmission applications. This listing includes six pieces per package. Machinists, millwrights, and maintenance technicians cut key stock to length on the job to fit standard keyways.

Key stock of this profile is commonly used in industrial and commercial maintenance settings where shaft-to-hub connections require a removable, positive drive key. The 5/16 by 1/4 inch cross-section fits keyway slots sized for that profile in pumps, blowers, conveyor drives, and general-purpose shaft assemblies. The 12-inch bar length allows field cutting to match specific hub widths. The zinc finish provides light corrosion protection during storage and prior to installation.

Key Features

• Low-carbon steel construction meets ASTM A108 material specification
• Rockwell B80-90 hardness for reliable shear resistance in drive applications
• Zinc finish offers light corrosion protection during storage
• 5/16 inch width by 1/4 inch height cross-section fits standard keyway profiles
• 12-inch bar length allows field cutting to required length
• Six pieces included per package

Compatibility

Designed as a standard key stock replacement for shaft-to-hub connections requiring a 5/16 by 1/4 inch keyway profile in general-purpose mechanical drive assemblies.

Installation Notes

Key stock installation is typically performed by machinists, millwrights, or maintenance technicians. De-energize and lock out all drive equipment before accessing shaft components. Cut key stock to length using a bandsaw, hacksaw, or abrasive cutoff tool, then deburr all cut edges before fitting into the keyway. Ensure the key seats fully in the shaft keyway and that the hub keyway aligns before pressing or sliding the hub into position.