Cleveland C52158 Square End Mill 11/32 in 2 Flute Cobalt

Product Description

The CLEVELAND C52158 is a cobalt square end mill designed for high-performance metal removal in demanding machining applications. Built from M42 cobalt high-speed steel, this double-end, two-flute tool measures 0.3438 inches (11/32 inches) in cutting diameter with a 0.5625-inch (9/16 inches) length of cut and a 3.5-inch overall length. The spiral flute geometry and 30-degree helix angle promote chip evacuation and reduce cutting forces. The centercutting design allows plunge milling in addition to peripheral and slot milling. Licensed machinists and tool-and-die professionals reach for this series when working materials that demand heat-resistant tooling.

The C52158 is suited for milling stainless steel, high-temperature alloys, and general steel workpieces where cobalt tooling outperforms standard high-speed steel. Its HDC-2 series designation places it in a heavy-duty category built for rigidity and longer tool life in these tough materials. The 3/8-inch straight-cylindrical shank with Weldon flat is compatible with standard end mill holders and set-screw style tool holders on vertical mills, CNC machining centers, and knee mills running right-hand spindle rotation.

Key Features

• M42 cobalt construction for improved heat and wear resistance over standard HSS
• 30-degree helix angle spiral flute for efficient chip evacuation
• Centercutting geometry enables plunge, slot, and peripheral milling
• Double-end design extends usable tool life
• Right-hand cut and right-hand flute for standard spindle operation
• Weldon flat on 3/8-inch shank for positive grip in set-screw holders

Compatibility

Designed for use with standard 3/8-inch end mill holders and Weldon-style tool holders. Primary workpiece materials include high-temperature alloys, stainless steel, and steel.

Installation Notes

Installation should be performed by a qualified machinist following shop safety procedures. Ensure the spindle is fully stopped and the machine is in a locked-out state before changing tooling. Seat the Weldon flat against the set screw in the tool holder and torque to the holder manufacturer's specification. Verify runout with a dial indicator before beginning a cut to maximize tool life and surface finish quality.