Mak-a-key SK05-2 Step Key Stock 12 in Steel Zinc

Product Description

The MAK-A-KEY SK05-2 is a step key stock designed for use in mechanical power transmission assemblies where a stepped profile is required to secure rotating components to a shaft. Measuring 12 inches in length with a 3/8-inch extension width and 1/8-inch extension height, this key stock is machined from C1018 steel and finished with a zinc plating for corrosion resistance. The stepped geometry allows it to fit keyways that require two different heights along the key length, making it a practical solution for staged shaft assemblies.

Step key stock like the SK05-2 is used in industrial and mechanical maintenance applications including pump drives, conveyor systems, fan shafts, and motor couplings. It is typically installed by millwrights, maintenance mechanics, and machinists during shaft-to-hub assembly or when replacing worn or damaged key stock in existing equipment. The 12-inch length allows field cutting to the required finished length.

Key Features

• Stepped profile with 3/8-inch extension width and 1/8-inch extension height
• C1018 steel construction for reliable strength in power transmission applications
• Zinc-plated finish provides corrosion resistance during storage and service
• 12-inch length can be cut to size in the field
• UNSPSC Code 31163208 for procurement and catalog classification

Compatibility

Designed as a standard step key stock replacement for mechanical shaft-to-hub assemblies that require a stepped keyway profile in industrial and commercial equipment.

Installation Notes

Step key stock is installed by qualified millwrights or mechanical technicians. Always de-energize and lock out the drive equipment before removing or installing key stock. Use a proper keyway file or broach to ensure the keyway is free of burrs before fitting the key. Do not hammer key stock into a misaligned keyway, as this can damage the shaft or hub bore.