Cleveland C44551 Tool Bit Blank M42 Cobalt 4 in Square

Product Description

The CLEVELAND C44551 is a square-ground tool bit blank machined from M42 cobalt high-speed steel, intended for use by machinists and tool-and-die professionals who grind their own single-point cutting tools to custom geometries. The blank measures 0.5 inches wide by 0.5 inches high with a 4-inch overall length (101.60 mm). M42 cobalt HSS offers higher red-hardness and wear resistance than standard M2 or M7 grades, making it a practical choice for cutting harder workpiece materials where tool life is a priority. The square cross-section and ground finish provide consistent geometry as a starting point for custom tool grinding.

This tool bit blank is used in manual and CNC lathe work, boring operations, and custom single-point tooling applications across job shops, production machine shops, and maintenance environments. It is suited for toolholders and boring bar setups that accept 0.5-inch-square blanks. The ground finish allows the machinist to apply a final cutting edge geometry with a bench or surface grinder without first having to remove significant stock.

Key Features

• M42 cobalt HSS material grade for superior hardness and heat resistance compared to standard HSS grades
• Square cross-section: 0.5 inches wide by 0.5 inches high for consistent seating in standard toolholders
• 4-inch overall length (101.60 mm) provides adequate shank length for clamping and overhang adjustment
• Ground finish reduces prep time before final edge geometry is applied
• Sold individually — one blank per package

Compatibility

Designed as a general-purpose blank for use in any toolholder or setup accepting a 0.5-inch-square tool bit; final cutting geometry is ground by the end user to suit the specific application.

Installation Notes

Grinding tool bit blanks should be performed by qualified machinists using appropriate bench or surface grinding equipment with wheels rated for HSS or cobalt alloys. Always wear eye protection and follow shop safety procedures during grinding. Secure the blank firmly in a tool grinder rest or fixture to maintain consistent relief and rake angles. Allow the blank to cool during grinding to prevent loss of temper in the cutting edge.