Osg 86300409 Square End Mill 1/4 in 3 Flute Solid Carbide

Product Description

The OSG 86300409 is a solid carbide square end mill designed for precision milling operations in metalworking and machining applications. With a 0.25 inch cutting diameter, 0.75 inch length of cut, and a 40-degree helix angle, this tool delivers clean, accurate cuts in a wide range of materials. The DLC (Diamond-Like Carbon) finish reduces friction and extends tool life in demanding cutting conditions. Centercutting geometry allows for plunge milling, adding versatility to the tool. It is used by machinists and CNC operators working in job shops, production facilities, and tool rooms.

This end mill is suited for slotting, profiling, and plunge operations on ferrous and non-ferrous workpieces. The 3-flute configuration balances chip evacuation and cutting edge strength, making it effective in both roughing and light finishing passes. The right-hand cut and right-hand flute geometry are standard for conventional and climb milling on vertical and horizontal machining centers. The 0.25 inch shank diameter fits standard collets and end mill holders common to most CNC and manual milling machines.

Key Features

• Solid carbide construction for rigidity and wear resistance in demanding cuts
• DLC finish reduces friction and improves tool life in abrasive materials
• 40-degree helix angle promotes smooth cutting action and efficient chip flow
• Centercutting design enables direct plunge entry into workpiece material
• 3-flute geometry balances material removal rate with chip clearance
• Right-hand cut and right-hand flute orientation for standard milling setups

Compatibility

Designed as a direct-fit replacement for 0.25 inch shank square end mills in standard ER collets, end mill holders, and shrink-fit toolholders used on CNC machining centers and manual knee mills.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the spindle fully stopped and machine power locked out per shop safety procedures. Ensure the collet or holder is clean and free of chips before seating the shank. Verify runout with a dial indicator after clamping, as excessive runout will accelerate tool wear and reduce surface finish quality. Consult the machine manufacturer and applicable OSHA or ANSI B11 guidelines for safe tooling change practices.