Precision Brand 15250 Key Stock 3/8x3/16x12 in Zinc 6pc

Product Description

The PRECISION BRAND 15250 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 3/8 inch wide by 3/16 inch high by 12 inches long and meets ASTM A108 material specification. Hardness is rated at Rockwell B80-90, providing reliable shear resistance under moderate load conditions. The zinc finish offers basic corrosion protection in typical indoor or light industrial environments. This listing includes six pieces per package, making it suitable for maintenance stock or small-scale repair tasks. Machinists, millwrights, and maintenance technicians are the primary installers.

This key stock is used in residential and commercial mechanical assemblies wherever a standard rectangular key is required to transmit torque between a shaft and a hub. Common applications include pump assemblies, conveyor drives, HVAC blower shafts, and general power-transmission equipment. The 3/8 x 3/16 inch cross-section corresponds to a widely used shaft-keyway dimension range. Stock can be cut to length on-site using a hacksaw or cold saw to fit specific keyway depths and hub widths.

Key Features

• Low-carbon steel construction per ASTM A108 for consistent mechanical properties
• Rockwell B80-90 hardness for adequate shear strength in moderate-duty drive applications
• Zinc finish provides basic corrosion resistance for indoor and light industrial use
• 3/8 inch width by 3/16 inch height cross-section fits standard keyway dimensions
• 12-inch length allows on-site cutting to required fit
• Six-piece package supports maintenance inventory and multi-shaft jobs

Compatibility

Designed as a standard rectangular key stock replacement for mechanical drive shafts requiring a 3/8 x 3/16 inch keyway profile. Verify shaft and hub keyway dimensions before installation.

Installation Notes

Key stock installation is typically performed by machinists or millwrights following lockout/tagout procedures before servicing any rotating equipment. Ensure the shaft and hub keyways are clean and free of burrs before fitting the key. Key stock should be cut to length with a cold saw or hacksaw and deburred before installation. Do not force an oversized key into a keyway, as this can cause shaft or hub damage.