Cleveland C38957 2-Flute HSS Keyway Tolerance Square Single End Mill

Cleveland C38957 End Mill Overview

The Cleveland C38957 is a two-flute high-speed steel square end mill manufactured to keyway tolerances for precise slotting work. Its center-cutting geometry allows plunge entry into the workpiece without pre-drilling. The tool is suited for general-purpose milling in ferrous and non-ferrous materials where tight keyway fits are required. Machinists and maintenance technicians will find it useful for keyseat production and repair tasks.

Setup Compatibility Check

Verify that your milling machine or drill press accepts a 3/8 inch shank and that the toolholder provides adequate rigidity for high-speed steel cutting. Confirm the spindle speed range can be set appropriately for the material and the 1/8 inch cutting diameter to avoid excessive tool wear. Ensure the workholding secures the part firmly against the cutting forces generated during slotting operations. Coolant or mist delivery should be available for optimal chip evacuation and tool life.

Upgrade Context

This end mill replaces worn or damaged high-speed steel keyway cutters of the same diameter and shank size. The jump is worthwhile when existing tools no longer hold the tight tolerances needed for keyway fits or when center-cutting capability is required for plunge milling. It also serves as a cost-effective alternative to carbide where machine rigidity or setup conditions favor the toughness of high-speed steel. Buyers needing larger diameters or different shank sizes will need a different tool.