Value Collection 460-6049 M42 Cobalt Tool Bit Blank 5/16in

Product Description

The VALUE COLLECTION 460-6049 is a square tool bit blank machined from M42 cobalt high-speed steel, designed as raw stock for grinding custom single-point or form cutting tools. Measuring 5/16 inches wide by 5/16 inches high with a 2.5-inch overall length, this blank gives machinists a solid starting point for producing lathe tools, boring tools, and specialty cutters to exact geometry. M42 cobalt grade provides elevated red-hardness and wear resistance compared to standard M2 high-speed steel, making it well suited for interrupted cuts and harder workpiece materials. The piece weighs approximately 0.08 pounds.

This tool bit blank is appropriate for use in manual and CNC lathes, shaping machines, and tool-and-cutter grinders in job shop, production machining, and maintenance environments. Machinists grind the blank to a specific relief, rake, and nose geometry using a bench or pedestal grinder. The square cross-section suits standard tool holders and lantern-style post holders that accept 5/16-inch tooling. It is a practical choice when a standard insert toolholder profile does not match the required form or when custom geometry is needed for a one-off operation.

Key Features

• M42 cobalt high-speed steel construction for improved heat and wear resistance over standard HSS
• Square cross-section — 5/16 inches wide by 5/16 inches high — fits common 5/16-inch tool post holders
• 2.5-inch overall length provides sufficient stock for grinding and re-grinding multiple times
• Unground blank allows full custom geometry to be applied at the bench or pedestal grinder
• Lightweight at 0.08 pounds — easy to handle and store in quantity

Compatibility

Designed as a general-purpose unground blank for use in any tool holder or grinder setup that accepts 5/16-inch square high-speed steel tool bits.

Installation Notes

Grinding this blank to final tool geometry is typically performed by a machinist or toolroom technician using a bench grinder or surface grinder equipped with an aluminum oxide wheel appropriate for high-speed steel. Wear eye protection and use a tool rest when grinding. Quench the blank regularly in water during grinding to prevent overheating the cutting edge, which can soften the M42 material. Secure the finished tool bit firmly in the tool holder before engaging the workpiece.