Cleveland C44645 M42 Cobalt Tool Bit Blank 4 Inch

Product Description

The CLEVELAND C44645 is a rectangle ground tool bit blank machined from M42 cobalt high-speed steel. It measures 1/2 inch wide, 3/4 inch high, and 4 inches in overall length. M42 cobalt is an 8-percent cobalt high-speed steel alloy known for its ability to hold a cutting edge under high heat and interrupted-cut conditions. The ground finish ensures dimensional accuracy out of the box, reducing the amount of material a toolmaker or machinist needs to remove when shaping and honing a custom cutting profile. This blank is intended to be ground to the desired tool geometry by the end user.

Tool bit blanks like the C44645 are used in toolrooms, job shops, and maintenance departments where custom single-point lathe tools, boring tools, or form tools are fabricated in-house. The rectangular cross-section suits standard tool holders and lathe tool posts. M42 cobalt blanks are a common choice when cutting harder ferrous materials, stainless steels, or high-temperature alloys where standard M2 high-speed steel loses edge retention at elevated temperatures.

Key Features

• M42 cobalt (8% Co) high-speed steel for superior hot hardness and wear resistance
• Rectangle ground profile for close dimensional tolerances
• 1/2 inch wide x 3/4 inch high cross-section fits standard lathe tool holders
• 4-inch overall length provides material for multiple grinds and resharpening cycles
• Ground surface reduces initial stock removal when forming a custom cutting edge

Compatibility

Designed as a general-purpose tool bit blank for use in standard lathe and boring tool holders that accept rectangular shank tooling with a 1/2 inch x 3/4 inch cross-section.

Installation Notes

Tool bit blanks require grinding to the intended cutting geometry before use. Machinists and toolmakers should use a suitable bench or surface grinder with a wheel rated for high-speed steel. Appropriate personal protective equipment, including face shield and grinding gloves, is required during shaping operations. Follow your shop's standard tool-grinding procedures and ensure the blank is fully supported in the grinding fixture to maintain consistent rake and clearance angles.