Cleveland C52157 Square End Mill 5/16 in 2 Flute Cobalt

Product Description

The CLEVELAND C52157 is a cobalt square end mill designed for high-performance metal removal in demanding machining applications. Built to M42 cobalt material grade, this double-end tool delivers extended tool life when cutting high temperature alloys, stainless steel, and steel. The C52157 measures 0.3125 inches in cutting diameter with a 0.5625-inch length of cut and a 0.375-inch straight-cylindrical shank that also accepts a Weldon flat drive. A 30-degree helix angle promotes efficient chip evacuation and reduces heat buildup at the cutting edge. This is a centercutting design, allowing direct plunge entry into workpieces without a pre-drilled pilot hole.

The C52157 belongs to Cleveland's HDC-2 series and is intended for use in CNC machining centers, manual knee mills, and similar setups where high-alloy and stainless materials are regularly machined. The right-hand cut and right-hand spiral flute geometry suits standard spindle rotation without modification. At 3.5 inches overall length and a regular length classification, this end mill is well-suited for general-purpose side milling, slotting, and profiling operations in tool rooms and production environments. Machinists and toolroom operators working with aerospace alloys, medical-grade stainless, and structural steel are the primary users.

Key Features

• M42 cobalt construction for elevated heat and wear resistance in high-alloy materials
• Double-end design provides a second usable cutting end, extending tool service life
• Centercutting geometry enables direct plunge cuts without pre-drilling
• 30-degree helix angle supports efficient chip flow and reduced cutting temperatures
• Straight-cylindrical shank with Weldon flat option for positive tool holding
• Right-hand cut and right-hand flute for standard CNC and manual machine compatibility

Compatibility

Designed for use in standard 3/8-inch tool holders and collets. Primary workpiece materials include high temperature alloys, stainless steel, and steel, consistent with HDC-2 series application intent.

Installation Notes

Installation should be performed by a qualified machinist following standard toolroom practices. Ensure the machine spindle is fully stopped and the tool holder is clean and free of debris before securing the end mill. Verify runout after installation using a dial indicator before beginning cuts. Consult machine manufacturer torque recommendations for set screw engagement on Weldon flat holders.