Hertel E899921270 Square End Mill 5/16 in 2 Flute Hss Tin

Product Description

The HERTEL E899921270 is a two-flute, single-end square end mill designed for general-purpose milling operations in machine shops and production environments. Manufactured from high speed steel (HSS) with a titanium nitride (TiN) coating, this tool delivers extended wear resistance and reduced friction compared to uncoated HSS. The 5/16-inch cutting diameter pairs with a 9/16-inch length of cut and a 3/8-inch shank diameter, giving machinists a compact, rigid tool suited for slotting, profiling, and peripheral milling in ferrous and non-ferrous materials. At 2.5 inches overall length and 0.5 pounds, it mounts easily in standard collet chucks and end mill holders.

This end mill is suited for light-to-medium-duty milling work on manual knee mills, CNC machining centers, and toolroom equipment. The centercutting geometry allows direct plunge entry into workpiece material without pre-drilling, making it useful for pocket milling and step milling operations. The 30-degree right-hand spiral flute promotes efficient chip evacuation during climb and conventional milling cuts. Typical applications include contouring, side milling, and shallow slotting in steel, aluminum, and similar materials where a small-diameter HSS tool is specified.

Key Features

• 5/16-inch cutting diameter with 9/16-inch length of cut for compact reach in tight setups
• High speed steel construction with titanium nitride (TiN) coating for improved wear life
• Two-flute, 30-degree right-hand spiral geometry for effective chip clearance
• Centercutting design enables direct plunge milling without a pilot hole
• 3/8-inch shank diameter fits standard collet chucks and end mill holders
• Single-end configuration; right-hand cut and right-hand flute direction

Compatibility

Designed as a standard single-end square end mill with a 3/8-inch shank, compatible with any collet chuck, end mill holder, or milling machine spindle that accepts a 3/8-inch straight shank tool.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the machine powered off and the spindle fully stopped. Ensure the shank is clean and seated fully in the holder before tightening to the tool manufacturer's recommended clamping practice. Verify runout with a dial indicator after mounting, as excessive runout reduces tool life and surface finish quality. Always follow applicable shop safety procedures and machine guarding requirements during setup and operation.