Cleveland C39581 Square End Mill 5/16 in 3 Flute Hss

Product Description

The CLEVELAND C39581 is a double-end, three-flute square end mill ground from high speed steel (HSS) and built for general-purpose milling in a machine shop environment. It features a 5/16-inch cutting diameter, a 3/4-inch length of cut, and a 3/8-inch straight-cylindrical shank with a Weldon flat for positive tool holding. The 30-degree spiral flute geometry promotes efficient chip evacuation and smooth cutting action. The tool runs in a right-hand cut, right-hand flute configuration with centercutting capability, allowing plunge entry as well as conventional peripheral milling. Overall length is 3-1/2 inches. The uncoated finish suits operators who prefer easy resharpening or who work in materials where coating adhesion is less critical.

This end mill is suited for milling operations on cast iron, non-ferrous metals, and steel in both manual and CNC machining setups. The Series HD-3 designation places it in a regular-length category, making it appropriate for standard-depth slots, pockets, and profiling cuts where extended reach is not required. Machinists working in job shops or maintenance environments will find the double-end design an efficient use of tooling budget, as both ends are usable before the tool is retired.

Key Features

• Double-end design provides two usable cutting ends per tool
• Centercutting construction allows direct plunge milling
• 30-degree helix angle promotes chip flow and reduces cutting forces
• Weldon flat on shank provides secure seating in standard end mill holders
• Uncoated HSS construction allows conventional resharpening
• Right-hand cut and right-hand flute for standard spindle operation

Compatibility

Designed for use on cast iron, non-ferrous metals, and steel workpieces. Fits any standard end mill holder or collet accepting a 3/8-inch straight shank with Weldon flat.

Installation Notes

Install in a Weldon-flat-compatible end mill holder and torque the set screw against the flat face to prevent axial pullout. Ensure the spindle and machine table are fully stopped before changing tooling. Verify runout at the cutting tip after installation before beginning a cut. Follow shop safety practices and applicable OSHA machining standards when operating milling equipment.