Osg HP441-2500 Square End Mill 1/4 in 4 Flute Solid Carbide

Product Description

The OSG HP441-2500 is a 4-flute solid carbide square end mill designed for high-performance milling in demanding shop environments. Built from micrograin carbide and finished with a TiAlN coating, it handles elevated cutting temperatures and abrasive workpiece materials with consistent edge integrity. The 0.25-inch diameter and 0.75-inch length of cut make it well suited for slotting, profiling, and peripheral milling in tight tolerances. A 35-degree helix angle promotes smooth chip evacuation and reduces cutting forces. Centercutting geometry allows direct plunge entry without a pre-drilled hole. Licensed machinists and CNC operators are the primary users of this tool.

This end mill fits standard 0.25-inch ER or straight-bore tool holders and is appropriate for use on vertical machining centers, CNC routers, and manual mills. The HP441 series is designed for general-purpose to high-efficiency milling across a range of ferrous and non-ferrous materials where TiAlN coating provides a thermal barrier advantage. Its 2.5-inch overall length keeps overhang low for improved rigidity in most standard milling setups.

Key Features

• Solid micrograin carbide construction for wear resistance and edge retention
• TiAlN finish for elevated heat resistance and extended tool life in dry or semi-dry cutting
• 4-flute spiral design with 35-degree helix angle for efficient chip evacuation
• Centercutting capable - allows direct plunge milling without pilot hole
• Right-hand cut and right-hand flute configuration for standard spindle direction
• Regular length profile minimizes deflection for accurate feature geometry

Compatibility

Designed as a general-purpose replacement or production end mill for use in 0.25-inch collet or shrink-fit toolholders on CNC machining centers and manual mills requiring a 4-flute square end geometry in the HP441 series.

Installation Notes

Installation is performed by a qualified machinist or CNC setup technician. Ensure the spindle is fully stopped and the machine is in an e-stop or lockout state before inserting or removing the tool. Seat the shank fully into the toolholder and torque the collet nut to the toolholder manufacturer specification. Verify runout with a dial indicator before beginning a production cut, as excessive runout accelerates edge wear and degrades surface finish.