Gws 121345 Corner Radius End Mill 1/4 in 5 Flute Carbide

Product Description

The GWS 121345 is a solid carbide corner radius end mill designed for high-performance material removal in demanding machining applications. Built to Series 1035 specifications, it features a 1/4-inch (0.2500-inch) cutting diameter, a 0.015-inch corner radius, and five flutes with a variable helix and variable index geometry. The extra-long 3-inch overall length paired with a 1-1/8-inch length of cut makes it well suited for deep-pocket milling and extended-reach work. Right-hand cutting and right-hand flute direction are standard. The centercutting design allows plunge entry, and the nACo (FX1) coating provides thermal and wear resistance for ferrous and hard-material applications.

This end mill is intended for use in CNC machining centers and manual mills where precision contouring, slotting, and roughing-to-finishing operations are required in a single tool. Primary workpiece materials include steel, cast iron, superalloys, titanium, and hard materials. Secondary suitability covers stainless steel. The straight cylindrical shank with h6 tolerance mounts directly into standard end mill holders. The extra-long reach is particularly useful when accessing deep features or working around fixturing obstructions.

Key Features

• Solid carbide submicron-grade substrate for rigidity and edge retention in hard materials
• Variable helix and variable index flute geometry reduces chatter and harmonics during cut
• 0.015-inch corner radius protects the cutting edge and improves surface finish at part corners
• Centercutting design permits direct plunge into the workpiece without pre-drilling
• nACo (FX1) coating rated for steel, stainless steel, cast iron, superalloys, titanium, and hard materials
• Extra-long 3-inch OAL supports deep-reach applications without sacrificing rigidity

Compatibility

Designed for use with standard end mill holders accepting a 1/4-inch straight cylindrical shank with h6 tolerance. Suitable for machining steel, stainless steel, cast iron, superalloys, titanium, and hard materials (material codes P, K, M, S, H).

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the machine spindle is fully stopped and locked out before mounting or removing the tool. Seat the shank fully into the end mill holder and torque the retention mechanism to the holder manufacturer's specification. Confirm runout with a dial indicator before beginning the cut, as excessive runout will accelerate edge wear and degrade surface finish.