Precision Brand 15500 Key Stock 3/4x3/8x12 in Zinc 6pc

Product Description

The PRECISION BRAND 15500 is a zinc-finished, low-carbon steel key stock used to transmit torque between a shaft and a mating hub, gear, pulley, or sprocket. Each piece measures 0.75 inches wide by 0.375 inches tall by 12 inches long and meets ASTM A108 material specifications. Hardness is rated at Rockwell B80-90, giving the stock enough toughness to handle moderate drive-train loads without excessive brittleness. The zinc finish provides basic corrosion resistance for light-duty and indoor industrial applications. This package includes 6 pieces of identical key stock, making it practical to stock spares or complete multiple jobs from a single order.

Key stock in this size is commonly used in light to medium industrial machinery, HVAC drive assemblies, pump shafts, conveyor systems, and general power-transmission setups. Machinists, millwrights, and maintenance technicians typically select this stock when field-cutting a custom-length key to fit a specific keyway. The 12-inch length allows a single piece to be cut down to multiple finished keys with standard metalworking tools.

Key Features

• Low-carbon steel construction per ASTM A108 for consistent machinability and reliable tensile strength
• Rockwell B80-90 hardness balances toughness with ease of cutting and filing
• Zinc finish offers basic corrosion resistance for indoor and light-duty service environments
• 0.75 x 0.375 x 12 inch dimensions allow field cutting to any required key length
• Package of 6 pieces supports multi-job stocking or on-site spares

Compatibility

Designed as a standard key stock replacement for any keyway application requiring a 3/4 inch wide by 3/8 inch thick profile; verify shaft and hub keyway dimensions before installation.

Installation Notes

Shut down and lock out all rotating equipment before removing or installing key stock, following applicable OSHA lockout/tagout procedures. Use a file, bandsaw, or abrasive cutoff tool to trim the key to finished length; deburr all cut edges before fitting. Confirm the key seats fully in both the shaft keyway and the hub keyway with no rocking before applying set screws or other retaining hardware. Key installation is typically performed by a qualified millwright or maintenance technician familiar with shaft and hub tolerances.