Osg HP421-3937 Square End Mill 0.3937 in 2 Flute Carbide

Product Description

The OSG HP421-3937 is a solid carbide square end mill designed for high-performance milling applications in metal cutting and precision machining. It features a 0.3937 inch (10 mm) mill diameter, a 0.9843 inch (25 mm) length of cut, and a 2-flute configuration with a 35-degree helix angle. The TiAlN coating provides heat resistance and extended tool life in ferrous and hardened materials. Built from micrograin carbide, this end mill delivers consistent edge integrity under aggressive cutting conditions. It is suited for CNC machining centers and manual mills operated by machinists and toolroom professionals.

This end mill fits standard milling applications in job shops, production facilities, and toolroom environments. The HP421 series is engineered for demanding materials where tool rigidity and coating durability are critical. The centercutting geometry allows plunge entry in addition to peripheral and slot milling. The right-hand cut and right-hand spiral flute configuration suits conventional CNC spindle setups. With an overall length of 70 mm and a 10 mm shank diameter, it mounts directly in standard collet chucks, end mill holders, and shrink-fit tooling systems.

Key Features

• Solid micrograin carbide construction for edge stability in hard and abrasive materials
• TiAlN finish for thermal resistance and extended tool life
• 35-degree helix angle for improved chip evacuation and surface finish
• Centercutting design allows direct plunge milling
• Right-hand cut with right-hand spiral flute for standard CNC spindle compatibility
• 2-flute geometry suited for slotting and finishing passes

Compatibility

Designed as an OEM-style replacement and standard tooling option for CNC machining centers and manual mills using 10 mm shank collet chucks or end mill holders compatible with the OSG HP421 series.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator. Ensure the spindle is fully stopped and the machine is in a safe, locked-out state before changing tooling. Verify collet or holder runout before tightening to manufacturer torque specifications for your specific toolholder system. Do not exceed the recommended depth of cut or feed rate for the workpiece material and tool diameter.