Robbjack ST-434-20-C Corner Chamfer End Mill 5/8 in 4 Flute

Product Description

The ROBBJACK ST-434-20-C is a solid carbide corner chamfer end mill engineered for precision edge preparation and chamfering on ferrous and exotic workpiece materials. With a 5/8-inch cutting diameter and a 1-1/4-inch length of cut, this 4-flute, single-end mill produces consistent 45-degree chamfers with a chamfer width of 0.0090 to 0.0110 inches. A 30-degree helix angle promotes smooth chip evacuation, and the TiCN PVD coating increases surface hardness and wear resistance for extended tool life in demanding applications. Weighing 0.25 pounds, it is suited for CNC machining centers running right-hand cutting operations.

The ST-434-20-C is intended for use on steel, stainless steel, cast iron, superalloys, and titanium - workpiece material codes P, M, K, and S. Its regular-length geometry and straight-cylindrical shank make it a direct fit for standard ER or end mill holders on vertical and horizontal machining centers. Typical applications include side milling and edge chamfering in both roughing and finishing operations across aerospace, toolroom, and general metalworking environments. The 3-1/2-inch overall length provides adequate reach for most standard fixturing setups.

Key Features

• 45-degree chamfer angle with 0.0090-inch chamfer length for consistent edge prep
• Solid carbide construction for rigidity and heat resistance in hard materials
• TiCN PVD coating improves wear resistance on steel, stainless, and superalloy workpieces
• 30-degree medium helix angle supports efficient chip flow in right-hand cutting
• Straight-cylindrical 5/8-inch shank fits standard end mill and collet holders
• Rated for both roughing and finishing material removal in a single tool

Compatibility

Designed for use on steel, stainless steel, cast iron, superalloys, and titanium workpieces. Part of the ROBBJACK ST-434 series for corner chamfering and side milling applications.

Installation Notes

Installation is performed by a 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 and evenly in the collet or end mill holder and torque the retention mechanism to the holder manufacturer specification. Verify runout at the cutting diameter before beginning a production cut.