Sgs 91257 Corner Radius End Mill 1/4 in 2 Flute Carbide

Product Description

The SGS 91257 is a solid carbide corner radius end mill designed for precision milling in non-ferrous metal applications. It features a 1/4 inch diameter with a 0.01 inch corner radius, producing a controlled edge break that reduces chipping and extends tool life in aluminum, copper, brass, and similar materials. The 2-flute, single-end geometry supports efficient chip evacuation, while the 45-degree high helix angle promotes smooth cutting action at elevated feed rates. Part of the SGS Ski-Carb 45 series, this end mill is built from micrograin solid carbide for consistent dimensional accuracy. It is installed in standard end mill toolholders by machinists and CNC operators in job shop and production environments.

The SGS 91257 is suited for short-reach milling operations on non-ferrous metals in both manual milling machines and CNC machining centers. The Weldon flat shank provides positive drive engagement in set-screw toolholders, making it a practical choice for slotting, profiling, and light roughing passes. The coarse pitch and right-hand flute direction are optimized for climb and conventional milling in softer workpiece materials. The bright uncoated finish makes this tool appropriate for applications where coating buildup or contamination is a concern.

Key Features

• 0.01 inch corner radius reduces edge chipping on non-ferrous workpieces
• Micrograin solid carbide substrate for dimensional consistency and rigidity
• 45-degree high helix angle promotes chip evacuation at higher feed rates
• Weldon flat shank provides positive drive in set-screw toolholders
• Bright uncoated finish suitable for non-ferrous materials where coating interaction is undesirable
• Right-hand cut, right-hand flute spiral with coarse pitch for efficient roughing

Compatibility

Designed for use with standard end mill toolholders. Optimized for non-ferrous metal workpiece materials including aluminum and similar alloys. Part of the SGS Ski-Carb 45 series.

Installation Notes

Installation is performed by a machinist or CNC setup technician. Ensure the machine spindle is fully stopped and the toolholder is cleaned of chips and coolant residue before seating the end mill. Torque the Weldon flat set screw against the flat per the toolholder manufacturer's specification. Verify runout at the cutting edge before commencing a production cut.