Robbjack ST-343-10-A Corner Chamfer End Mill 5/16 in 3 Flute

Product Description

The ROBBJACK ST-343-10-A is a corner chamfer end mill designed for precision chamfering, slotting, side milling, helical interpolation, and ramping operations in demanding machining environments. Built from solid carbide and coated with AlTiN via a PVD process, this tool delivers reliable performance in high-heat cutting conditions. The cutter measures 5/16 inches in diameter with a 13/16 inch length of cut and a 40-degree high helix angle that promotes efficient chip evacuation. With a chamfer angle of 45 degrees and a chamfer width range of 0.0040 to 0.0060 inches, the ST-343-10-A is suited for machinists requiring tight, repeatable edge preparation on hard materials.

This end mill is intended for use on steel, stainless steel, cast iron, superalloys, and titanium - material classifications P, M, K, and S. It is a single-end, centercutting tool with right-hand flute direction and right-hand cutting direction, making it compatible with standard CNC machining centers and manual mills running conventional or climb milling operations. Typical applications include production and job-shop environments where consistent chamfer geometry and tool longevity are priorities. The helical flute style and normal pitch configuration support both roughing and finishing passes in a single tool.

Key Features

• Solid carbide construction with AlTiN PVD coating for heat and wear resistance in ferrous and exotic alloy cutting
• 45-degree chamfer angle with 0.0040 to 0.0060 inch chamfer width for precise edge preparation
• 40-degree high helix angle promotes efficient chip evacuation and reduces cutting forces
• Centercutting design enables plunge entry, helical interpolation, and ramping without a pre-drilled hole
• 3-flute configuration balances material removal rate with chip clearance for versatile roughing and finishing
• Straight-cylindrical shank fits standard ER collet chucks and end mill holders

Compatibility

Designed for use on steel, stainless steel, cast iron, superalloys, and titanium (material codes P, M, K, S). Compatible with standard straight-bore end mill holders and ER collet systems accepting a 5/16 inch shank diameter.

Installation Notes

Installation and operation should be performed by a qualified machinist familiar with CNC or manual milling equipment. Ensure the spindle is fully stopped and machine is powered down before loading or removing the tool. Secure the 5/16 inch straight-cylindrical shank in a properly sized collet or end mill holder, torquing to the holder manufacturer's specification. Verify runout with a dial indicator before cutting, as excessive runout will accelerate wear and compromise chamfer consistency on close-tolerance work.