Sgs 77255 Corner Radius End Mill 3/4 in 7 Flute Carbide

Product Description

The SGS 77255 is a solid carbide corner radius end mill designed for high-performance finishing operations in demanding metalworking applications. It features a 3/4 inch diameter cutting edge with a 0.0600 inch corner radius, 7 flutes, and a 37-degree high helix angle that promotes efficient chip evacuation and smooth surface finishes. The tool carries a TM coating to extend tool life when cutting abrasive and hard materials. With a 1.875 inch length of cut and 4 inch overall length, the 77255 is sized for reach and rigidity in finish milling passes on steel, stainless steel, cast iron, superalloys, and titanium. It is a single-end, right-hand cut tool built for use in CNC machining centers with standard end mill toolholders.

The SGS 77255 is suited for finishing operations on steel, stainless steel, cast iron, superalloys, and titanium, as well as secondary applications in hard materials. The close pitch, variable index, and micrograin carbide substrate make it well adapted to tight-tolerance finish passes where surface integrity and edge consistency matter. It is a common choice in aerospace, die and mold, and general precision machining environments where corner radius geometry is required to reduce stress concentrations and improve part quality.

Key Features

• 0.0600 inch corner radius with a tolerance of -0.0020 to 0.0000 inches for controlled edge geometry
• 7-flute, close-pitch configuration supports smooth surface finish in finishing passes
• 37-degree high helix angle promotes chip evacuation in deep cuts
• TM coating provides wear resistance on steel, stainless, cast iron, superalloys, and titanium
• Variable index flute spacing reduces harmonic vibration during cutting
• Micrograin solid carbide substrate delivers hardness and edge retention
• Right-hand flute direction and right-hand cutting; straight-cylindrical shank fits standard ER and hydraulic toolholders

Compatibility

Designed for use with standard end mill toolholders. Primary workpiece materials are steel, stainless steel, cast iron, superalloys, and titanium; secondary workpiece material is hard material. Part of the SGS Series 77C corner radius end mill line.

Installation Notes

Installation is performed by a machinist or CNC setup technician. Secure the shank fully within the toolholder to the recommended gauge line and verify runout before cutting. The h6 shank diameter tolerance is designed for close-fit toolholding systems such as ER collet chucks or hydraulic holders. This tool is not center-cutting; do not plunge straight down into solid material without a pre-drilled hole or ramping entry path.