Hertel GG99915663 Keyway End Mill 0.5in 2 Flute Hss

Product Description

The HERTEL GG99915663 is a 2-flute, straight-flute keyway end mill designed for cutting keyways and slots in ferrous and non-ferrous materials. It is manufactured from high speed steel (HSS) with no coating applied, and it features a centercutting geometry that allows plunge entry into the workpiece. The mill diameter is 0.5 inches, the length of cut is 1 inch, and the overall length is 3 inches. The 0-degree helix angle and straight flute configuration make this tool well suited for keyway applications where chip evacuation demands differ from those of conventional helical end mills. A matching 0.5-inch shank diameter simplifies toolholder selection on standard milling machines.

This end mill is used in machine shop and maintenance environments for milling keyways on shafts, producing slots in fixtures, and performing light profiling cuts in steel, cast iron, brass, and aluminum. The straight flute geometry is particularly effective when lateral cutting forces must be minimized or when the workpiece material tends to pull a helical tool. It is suitable for use on manual knee mills, CNC machining centers, and drill press setups where an appropriate milling vise is employed. This tool is a standard catalog item for machinists, tool and die makers, and maintenance technicians performing shaft and coupling work.

Key Features

• 0.5-inch mill diameter with 1-inch length of cut for standard keyway proportions
• Straight flute, 0-degree helix angle optimized for keyway and slot milling
• Centercutting design permits direct plunge entry without a pre-drilled pilot hole
• High speed steel construction provides toughness and regrindability
• Uncoated finish suitable for use with cutting fluid on a wide range of workpiece materials
• 0.5-inch shank diameter fits standard ER, R8, and CAT toolholders without a reducer

Compatibility

Designed as a direct-fit replacement for standard 0.5-inch diameter, 2-flute straight-flute keyway end mills used in manual and CNC milling applications requiring a 0.5-inch shank.

Installation Notes

Installation is performed by a machinist or maintenance technician using an appropriate collet chuck or end mill holder torqued per the toolholder manufacturer specification. Ensure the machine spindle is fully stopped and the power is locked out before changing tooling. Always verify shank seating depth and runout before initiating a cut. Use a recommended cutting fluid or coolant for HSS tooling when milling steel to extend tool life and maintain dimensional accuracy.