Osg HP421-1250 Square End Mill 1/8 in 2 Flute Carbide

Product Description

The OSG HP421-1250 is a solid carbide square end mill designed for precision milling in metalworking and machining applications. With a 1/8 inch (0.1250 inch) mill diameter and a 1/2 inch length of cut, this tool handles slotting, profiling, and peripheral milling in tight geometries. The micrograin carbide substrate supports a TiAlN coating, which improves heat resistance and extends tool life in ferrous and hardened materials. A 35-degree helix angle promotes smooth chip evacuation and reduces chatter. This end mill is a single-end, right-hand cutting tool suited for CNC machining centers and manual mills operated by machinists and toolroom professionals.

The HP421-1250 is suited for finish and semi-finish milling operations in steel, stainless steel, cast iron, and similar materials where tight tolerances and surface finish quality are priorities. The regular-length configuration and 1/8 inch shank diameter make it compatible with standard collets and end mill holders used in precision CNC and manual machining setups. It is particularly effective in die and mold work, aerospace component machining, and general job shop operations where a small-diameter carbide end mill is required.

Key Features

• Micrograin solid carbide substrate for rigidity and wear resistance in hard materials
• TiAlN coating improves thermal resistance and extends cutting tool life
• 35-degree helix angle promotes efficient chip flow and reduces vibration
• Right-hand cutting and right-hand flute direction for standard CNC spindle compatibility
• Center-cutting capable, allowing plunge entry into workpieces
• Spiral flute geometry supports smooth, consistent chip evacuation

Compatibility

Designed as a standard-shank solid carbide square end mill for use with 1/8 inch collets, shrink-fit holders, or equivalent end mill holding systems on CNC machining centers and manual milling machines.

Installation Notes

Installation should be performed by a qualified machinist familiar with end mill toolholding practices. Ensure the spindle is fully stopped and the machine is in a safe, de-energized state before changing tooling. Seat the shank to the recommended insertion depth in the collet or holder and torque the retention mechanism per the toolholder manufacturer specifications. Inspect the cutting edges for chips or damage before each use and replace the tool if wear exceeds acceptable limits for the application.