Precision Brand 15550 Key Stock 0.75x0.5x12 in Zinc 6pc

Product Description

The PRECISION BRAND 15550 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 assemblies. Each piece measures 0.75 inches wide by 0.5 inches tall by 12 inches long and meets ASTM A108 material specification. Hardness is rated at Rockwell B80-90, providing the strength needed for standard power transmission applications without being overly brittle. This package contains six pieces, making it suitable for stocking a shop or completing multiple repairs in a single order. Machinists, millwrights, and maintenance mechanics are the primary installers.

This key stock is used in industrial, commercial, and light manufacturing settings wherever keyed shaft connections are required. Typical applications include motor-to-pump couplings, conveyor drive assemblies, fan shaft connections, and gearbox installations. The 12-inch length allows the stock to be cut to the required keyway length on-site using standard cutting tools. The zinc finish provides a measure of corrosion resistance for use in moderately humid environments such as mechanical rooms, pump stations, and plant floors.

Key Features

• Low-carbon steel construction meets ASTM A108 specification for consistent mechanical properties
• Rockwell B80-90 hardness suitable for standard power transmission shaft connections
• Zinc finish adds corrosion resistance for use in damp or humid service environments
• 12-inch length can be cut to fit a wide range of keyway depths and shaft sizes
• Package of 6 pieces supports shop stocking and multi-unit repair jobs
• 0.75 inch width by 0.5 inch height profile fits correspondingly sized keyways

Compatibility

Designed as a standard key stock replacement for keyed shaft assemblies requiring a 0.75 inch wide by 0.5 inch tall profile in accordance with ANSI and ASTM A108 dimensional standards.

Installation Notes

Installation is typically performed by a machinist or millwright. Shut down and lock out the drive system before removing or installing any shaft hardware, following OSHA lockout-tagout procedures. Cut the key stock to the correct length using a bandsaw, cold saw, or angle grinder, and deburr all cut edges before fitting. Do not force the key into the keyway with a hammer strike that could damage the shaft or keyway walls.