Drill bit GRAPHITE 57H046 cobalt for metal, cylindrical shank, 8 mm

GRAPHITE 57H046 cobalt drill bit for metal, 8 mm, with a cylindrical shank is made from high-speed steel with added cobalt to increase heat resistance and wear performance. Designed for machining stainless steel, hardened steels and a variety of other metals, this drill bit fits standard drill chucks and is intended for workshop, construction and maintenance applications. The 8 mm cutting diameter and precise twist geometry provide stable drilling performance and accurate hole dimensions when used with appropriate speeds and cutting fluids.

Advantages

The cobalt alloy in the cutting material improves hardness at high temperatures, which reduces edge wear and extends tool life during drilling of tough or heat-prone metals. The cylindrical shank ensures secure clamping in standard chucks and simplifies tool changes. Ground flutes and a precisely formed point reduce wandering on the workpiece surface and promote efficient chip evacuation, contributing to consistent hole quality.

Suitable for

• Drilling stainless steel
• Drilling hardened and alloy steels
• Workshop and maintenance metalworking tasks
• Construction site on-site metal drilling

Key specifications

• Cutting diameter: 8 mm
• Material: high-speed steel with cobalt alloy
• Shank type: cylindrical shank for standard chucks
• Tip geometry: precision-ground point for reduced walking
• Flute design: spiral flutes for effective chip removal
• Typical applications: stainless steel, hardened steels and general metal drilling

How to use

Secure the drill bit in a compatible drill chuck, ensuring firm clamping of the cylindrical shank. Select appropriate drilling speed based on the workpiece material; use lower speeds for stainless and hardened steels to limit heat buildup. Apply steady feed pressure and allow the tool to cut without excessive force. Use cutting fluid or lubricant when machining steel and stainless steel to improve cooling and prolong tool life. After drilling, clear chips from the hole and inspect the cutting edges for wear before repeated use.

Usage recommendations

For best results when drilling stainless or hardened steels, use moderate spindle speeds, steady feed rates and appropriate cutting fluid. Re-sharpen or replace the bit when wear reduces hole quality to maintain accurate dimensions and avoid excessive heat generation.