Cleveland C44545 Tool Bit Blank 5/16 in Square M42 Cobalt

Product Description

The CLEVELAND C44545 is a square-ground tool bit blank manufactured from M42 cobalt high-speed steel. It measures 5/16 inches wide by 5/16 inches high with an overall length of 2.5 inches. Tool bit blanks are unfinished cutting tool stock that machinists grind to a custom profile for use in lathe, shaper, or planer operations. M42 cobalt steel offers higher hot hardness and wear resistance compared to standard M2 high-speed steel, making this blank well suited for machining hard or abrasive workpiece materials. The square cross-section and ground finish provide a consistent starting geometry for precision tool grinding.

This tool bit blank is intended for use in machine shops, tool rooms, and maintenance environments where custom-ground single-point cutting tools are required. It fits standard tool holders and lantern-style tool posts designed for 5/16-inch square shanks. Typical applications include turning, facing, boring, and threading operations on metal lathes. The M42 grade is particularly effective when cutting stainless steel, titanium, and other high-strength alloys that generate significant heat at the cutting edge.

Key Features

• M42 cobalt high-speed steel construction for superior hot hardness and edge retention
• Square ground cross-section — 5/16 inches wide by 5/16 inches high — provides consistent tool geometry
• 2.5-inch overall length offers sufficient stock for grinding and regrinding multiple times
• Ground finish ensures dimensional accuracy before custom tool profile is applied
• Compatible with standard 5/16-inch square tool holders and lantern tool posts

Compatibility

Designed as a standard 5/16-inch square tool bit blank for use in tool holders and tool posts that accept 5/16-inch square shank cutting tools on metal lathes and similar machine tools.

Installation Notes

Tool bit blanks are ground to a final cutting profile by a machinist or tool grinder before use. Use a bench or tool grinder with an appropriate wheel for high-speed steel; M42 cobalt responds best to aluminum oxide grinding wheels. Ensure the workpiece machine is fully powered down and locked out before changing or setting a tool bit in the tool holder. Follow shop safety practices including eye protection during all grinding operations.