Osg HP421-1575 Square End Mill 0.1575 in 2 Flute Carbide

Product Description

The OSG HP421-1575 is a solid carbide square end mill designed for precision milling operations in metalworking and machining environments. With a 0.1575 inch cutting diameter and a 0.5512 inch length of cut, this tool is built for controlled material removal in tight-tolerance applications. The micrograin carbide construction paired with a TiAlN coating provides heat resistance and extended tool life under demanding cutting conditions. A 35-degree helix angle promotes efficient chip evacuation while reducing cutting forces. This end mill is installed and operated by machinists and CNC programmers working in job shops, aerospace, mold and die, and general precision machining settings.

The HP421-1575 is suited for slotting, profiling, and peripheral milling in ferrous and non-ferrous materials where a small-diameter tool is required. The centercutting geometry allows plunge entry directly into the workpiece. Right-hand cut and right-hand spiral flute configuration is standard for conventional CNC milling setups. With a 4 mm shank diameter and 51 mm overall length, this tool fits standard ER collet chucks and end mill holders used on vertical and horizontal machining centers.

Key Features

• Solid micrograin carbide construction for rigidity and wear resistance in small-diameter applications
• TiAlN coating for elevated heat resistance and extended tool life at higher cutting speeds
• 35-degree helix angle for smooth chip flow and reduced cutting pressure
• Centercutting design permits direct plunge entry without a pre-drilled pilot hole
• 2-flute geometry provides adequate chip clearance in slotting and full-width cuts
• Right-hand cut with right-hand spiral flute — compatible with standard CNC spindle rotation

Compatibility

Designed as an OEM-specification tool in the OSG HP421 series; fits standard 4 mm shank collet chucks and end mill holders on CNC vertical and horizontal machining centers.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator. Ensure the machine spindle is fully stopped and locked out before mounting or removing the tool. Seat the shank fully in the collet or holder and torque the retention nut to the holder manufacturer's specification. Verify runout with a dial indicator before beginning a production cut, as excessive runout accelerates wear on small-diameter carbide tools.