Mak-a-key SK03-2 Step Key Stock 12 in Steel

Product Description

The MAK-A-KEY SK03-2 is a step key stock used to secure rotating components to shafts in mechanical drive assemblies. It features a stepped cross-section with a 1/4-inch extension width and a 1/8-inch extension height, allowing it to fit stepped keyway configurations where a standard rectangular key stock will not seat correctly. Machined from C1018 steel and finished with a zinc plating for corrosion resistance, this piece measures 12 inches in length and weighs approximately 0.166 pounds. It is a standard fastening component installed by machinists, millwrights, and maintenance mechanics working on motors, gearboxes, pumps, and similar rotating equipment.

Step key stock is used in industrial and commercial mechanical applications where shaft-to-hub connections require positive rotational drive. The stepped profile accommodates keyways that have two different depth levels across the width of the key seat. Common install scenarios include motor shaft couplings, conveyor drive assemblies, pump impeller shafts, and fan hubs. This 12-inch length can be cut to the required finished length on-site using standard metalworking equipment.

Key Features

• Stepped profile with 1/4-inch extension width and 1/8-inch extension height for two-depth keyway fitment
• C1018 steel construction for reliable strength in drive applications
• Zinc plating provides corrosion protection in typical indoor mechanical environments
• 12-inch length allows on-site cutting to required finished key length
• Weighs 0.166 pounds - lightweight for handling and fitting

Compatibility

Designed as an OEM-style replacement or maintenance stock for mechanical drive assemblies requiring step key stock in a 12-inch C1018 steel format.

Installation Notes

Step key stock is typically installed by machinists or millwrights during motor, pump, or gearbox assembly and maintenance. Always de-energize and lock out the equipment before removing or installing key stock. Use appropriate metalworking tools to cut the key to finished length and deburr all cut edges before insertion to prevent keyway damage. Ensure proper fit between the key, shaft keyway, and hub keyway before applying any load.