Value Collection 33978 Oversized Key Stock 3/8x3/8x12 in

Product Description

The VALUE COLLECTION 33978 is an oversized key stock bar used to secure rotating components such as gears, pulleys, and sprockets to shafts in mechanical drive systems. Machined from cold drawn steel and finished with a zinc plating for corrosion resistance, this key stock measures 3/8 inches high by 3/8 inches wide by 12 inches long. It is sized for applications requiring an oversized fit, meaning the cross-section is intentionally larger than standard to provide tighter tolerances or fill worn keyways. Machinists, millwrights, and maintenance technicians cut and fit this stock to length as needed during shaft-to-hub assembly.

This key stock is suited for industrial and commercial maintenance applications where power transmission components must be keyed to a shaft. Typical use cases include conveyor systems, pump drives, fan assemblies, and general machine tool repair. The 12-inch bar length provides material for multiple cuts depending on the required key length. Cold drawn steel construction delivers consistent dimensional accuracy and surface finish, which is important for proper keyway fit and load transfer.

Key Features

• Oversized cross-section for tight-fit or worn-keyway applications
• Cold drawn steel construction for dimensional consistency and surface finish
• Zinc plating provides baseline corrosion resistance during storage and service
• 12-inch bar length allows multiple cuts per piece
• Square profile: 3/8 inches high by 3/8 inches wide
• UNSPSC Code 31163208

Compatibility

Designed as an oversized replacement key stock for industrial shaft-and-hub assemblies requiring a 3/8 inch by 3/8 inch square key profile. Verify keyway dimensions before installation, as oversized stock is not a direct drop-in for standard keyway specifications.

Installation Notes

Millwrights and machinists typically install key stock using files, grinders, or a mill to fit the key to the specific keyway dimensions. Always de-energize and lock out the drive system before removing or installing shaft components. Confirm that both the shaft keyway and hub keyway are clean, free of burrs, and dimensioned to accept the oversized stock before pressing or driving the key into place. Do not force an oversized key into an undersized keyway without proper machining, as this can damage the shaft or hub.