Cleveland C42924 Square End Mill 4 Flute Cobalt Extra Long

Product Description

The CLEVELAND C42924 is a cobalt square end mill designed for milling operations that require extended reach and durability in demanding materials. Built to Series HGC-4C specifications, this tool features a 0.75-inch cutting diameter, a 4-inch length of cut, and a 0.75-inch shank diameter. The M42 cobalt construction provides higher heat resistance than standard HSS, making it well-suited for harder alloys and stainless steels. With a 30-degree helix angle and right-hand spiral flute geometry, it delivers efficient chip evacuation and stable cutting action. Licensed machinists and tool-and-die professionals are the primary users of this end mill in production and maintenance environments.

This end mill is suited for peripheral and slot milling in ferrous and non-ferrous materials where extra-long reach is required. The 6.25-inch overall length and 4-inch length of cut make it appropriate for deep-pocket and cavity work where standard-length tooling cannot reach. It is centercutting, allowing direct plunge entry without a pre-drilled starter hole. Right-hand cut and right-hand flute orientation match conventional milling setups on vertical and horizontal machining centers and manual mills.

Key Features

• M42 cobalt steel construction for improved red hardness over standard HSS
• 4-inch length of cut enables deep-pocket and extended-reach milling
• 30-degree helix angle promotes smooth cutting action and chip flow
• Centercutting design allows direct plunge milling without a pilot hole
• 4-flute configuration balances chip clearance with surface finish quality
• Uncoated finish allows easy regrinding and is compatible with cutting fluid applications

Compatibility

Designed as an OEM-style replacement or direct-use tooling for standard 0.75-inch collet and end mill holders on vertical machining centers, manual knee mills, and horizontal milling machines accepting a 0.75-inch shank diameter.

Installation Notes

Installation is performed by qualified machinists or toolroom personnel. Secure the shank fully in a clean, undamaged collet or end mill holder before tightening to the machine manufacturer's specified clamping torque. Inspect the cutting edges and shank for damage or runout before operation. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life and maintain dimensional accuracy.