Drill bit for metal GRAPHITE 57H015 cobalt cylindrical 2.2 mm set of 3

GRAPHITE 57H015 cobalt cylindrical drill bits, 2.2 mm diameter, set of 3 are designed for drilling metal and hard alloys. Made from high-speed steel with added cobalt, these cylindrical-shank bits offer enhanced wear resistance and higher heat tolerance compared to standard HSS drills. They are suitable for use with handheld drills and drill presses in workshops, maintenance, repair and metalworking applications where precise, small-diameter holes are required.

Advantages

The cobalt alloy increases hardness and red-hardness, allowing sustained cutting performance at higher temperatures and reducing premature wear. The cylindrical shank provides secure clamping in standard chucks and drill holders. A 2.2 mm diameter enables fine and accurate holes in thin and thick metal sheets, while the set of three ensures spare bits are available for continuous work. The bits are compatible with common drilling equipment and are intended for reliable, repeatable results when working with steel, stainless steel and other hard alloys.

Suitable for

• Drilling through mild steel and stainless steel
• Precision holes in metal components and panels
• Workshop repairs and maintenance tasks
• Use with hand drills and bench drill presses

Key specifications

• Diameter: 2.2 mm
• Quantity in set: 3 pieces
• Material: high-speed steel with cobalt alloy
• Shank type: cylindrical (straight) shank for standard chucks
• Intended use: drilling metal and hard alloys

How to use

Secure the workpiece and select appropriate clamping to prevent movement. Fit the cylindrical shank into the drill chuck and tighten firmly. Use suitable cutting speeds and feed rates for small-diameter cobalt HSS drills: start at lower speeds for stainless and hard alloys, apply steady pressure, and allow the drill to clear chips frequently. Use cutting fluid or coolant when drilling thicker or tougher metals to reduce heat and extend tool life. Replace worn bits from the set as needed.

Usage recommendations

The best results are achieved by using light, steady pressure, appropriate coolant, and by pre-drilling or centering for precise alignment on thin or coated materials. Avoid excessive lateral forces to prevent bit breakage and always follow safety measures when working with rotating tools.