Seco 05125 Tool Bit Blank 5/16 in Square Cobalt 6 in Oal

Product Description

The SECO 05125 is a square tool bit blank machined from WKE45-grade cobalt high-speed steel. Measuring 5/16 inches wide by 5/16 inches high with a 6-inch overall length, this blank provides the raw stock machinists and tool grinders need to create custom single-point cutting tools, form tools, and special-profile lathe tools. The cobalt alloy composition delivers higher red hardness and wear resistance compared to standard M2 high-speed steel, making it well suited for interrupted cuts and harder workpiece materials. No cutting edge is pre-ground; the end shape is square, ready for custom grinding to the desired geometry.

This tool bit blank is used in machine shops, maintenance facilities, and toolroom environments where standard off-the-shelf insert geometry does not meet the required profile. Machinists grind it to fit engine lathes, turret lathes, and manual boring applications. It is a common choice when working with stainless steel, titanium, heat-resistant alloys, and other materials that generate high cutting temperatures. The 6-inch length provides adequate stock for multiple regrinds over the life of the blank.

Key Features

• WKE45-grade cobalt high-speed steel for elevated red hardness and extended tool life in demanding cuts
• Square end shape provides a neutral starting geometry for custom single-point or form-tool grinding
• 5/16 inch by 5/16 inch cross-section fits standard tool holders and boring bar setups of that shank size
• 6-inch overall length yields multiple regrinds before the blank is consumed
• Solid blank construction with no pre-ground relief angles, giving full control over final geometry

Compatibility

Designed as a general-purpose tool bit blank for use in standard 5/16-inch tool holders and grinding fixtures on engine lathes and manual turning equipment.

Installation Notes

Grinding this blank to a finished cutting tool requires a bench or tool-and-cutter grinder equipped with an aluminum oxide or CBN wheel appropriate for cobalt high-speed steel. Ensure the grinder rest is set securely and the blank is held firmly to maintain consistent relief and rake angles. Eye protection and a face shield are required during grinding operations. Follow shop safety procedures for heat management; avoid overheating the cutting edge during grinding, as excessive heat can reduce the hardness of the cobalt alloy.