Seco 17016578 Roughing End Mill 0.25in 4 Flute Ticn Cobalt

Product Description

The SECO 17016578 is a single-end roughing end mill machined from M42 cobalt high-speed steel and coated with titanium carbonitride (TiCN). Designed for aggressive material removal, the four-flute spiral geometry with a 30-degree maximum helix angle drives chips clear of the cut while maintaining edge stability under heavy load. The 0.25-inch cutting diameter pairs with a 0.375-inch shank, giving it rigidity in standard end mill holders. This tool is center-cutting, so it can plunge directly into workpiece material without a pre-drilled pilot hole. Machinists and tool-and-die technicians are the primary users in job shop, production, and maintenance environments.

This end mill is suited for roughing passes in ferrous and non-ferrous metals where high material removal rate and heat resistance are priorities. The TiCN coating adds surface hardness and reduces friction at the cutting edge, extending tool life in interrupted cuts and harder alloys. The regular-length configuration with a 1.25-inch length of cut and 3.0625-inch overall length fits standard CNC machining centers and manual knee mills without requiring extended-reach toolholders. Coolant-through capability is not included, so flood or mist coolant applied externally is the recommended approach for heat management.

Key Features

• M42 cobalt high-speed steel substrate for elevated heat and wear resistance over standard M2 HSS
• TiCN coating increases surface hardness and reduces built-up edge formation
• Four right-hand spiral flutes with 30-degree maximum helix angle for efficient chip evacuation
• Center-cutting design allows direct plunge entry into workpiece material
• 0.375-inch shank diameter provides rigidity in collet chucks and end mill holders
• Single-end, regular-length configuration for general-purpose roughing applications

Compatibility

Designed as a general-purpose roughing end mill compatible with standard 0.375-inch end mill holders, collet chucks, and milling machine spindles on CNC machining centers and manual knee mills.

Installation Notes

Installation is performed by qualified machinists or toolroom personnel. Ensure the machine spindle is fully powered down and locked out before changing tooling. Seat the 0.375-inch shank fully into the holder and torque the retention hardware per the toolholder manufacturer specifications. Verify runout with a dial indicator before initiating a cut, as excessive runout accelerates edge wear on roughing geometries.