Robbjack ST-343-04-A Corner Chamfer End Mill 1/8 in 3 Flute

Product Description

The ROBBJACK ST-343-04-A is a solid carbide corner chamfer end mill designed for precision edge preparation and chamfering on demanding workpiece materials. With a 1/8 inch cutting diameter, 1/2 inch length of cut, and a 45-degree chamfer angle, this tool produces controlled chamfer widths ranging from 0.0030 to 0.0050 inches in a single pass. The AlTiN (aluminum titanium nitride) PVD coating extends tool life in high-temperature cutting environments. Three right-hand helical flutes at a 40-degree helix angle support both roughing and finishing operations. Licensed machinists and CNC tooling technicians install this end mill in vertical and horizontal machining centers for close-tolerance work.

The ST-343-04-A is suited for slotting, side milling, helical interpolation, and ramping operations. It is centercutting, allowing direct plunge entry. Primary workpiece materials include steel, stainless steel, cast iron, superalloys, and titanium. With a 1/8 inch straight-cylindrical shank and 1-1/2 inch overall length, this tool fits standard collet and end mill holders used in production and job-shop environments handling tight-tolerance ferrous and exotic alloy components.

Key Features

• 45-degree chamfer angle with 0.0030 to 0.0050 inch chamfer width range for consistent edge breaks
• AlTiN PVD coating for high heat and wear resistance on ferrous and superalloy materials
• 40-degree high-helix, three-flute geometry supports chip evacuation in both roughing and finishing cuts
• Centercutting design allows plunge entry without a pre-drilled pilot hole
• Solid carbide construction provides rigidity and dimensional stability at elevated cutting speeds
• Right-hand cut and right-hand flute direction compatible with standard CNC spindle rotation

Compatibility

Designed for use on steel, stainless steel, cast iron, superalloys, and titanium workpieces. Fits standard 1/8 inch collet and end mill holder systems. Suitable for slotting, side milling, helical interpolation, and ramping applications per ROBBJACK ST-343 series specifications.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician. Ensure the machine spindle is fully powered down and locked out before changing tooling. Seat the 1/8 inch straight shank fully into the collet or holder to the recommended grip length before torquing the retention system. Verify runout with a dial indicator after clamping, as excessive runout accelerates wear on small-diameter carbide tools.