Drill bit GRAPHITE model 57H022 cobalt metal cylindrical 3.2 mm

GRAPHITE cobalt cylindrical drill bit model 57H022, 3.2 mm diameter, is intended for drilling holes in ferrous and non‑ferrous metals. The bit is made with a cobalt alloy tip to improve heat resistance and durability during high‑speed metal cutting. Its cylindrical shank fits standard chucks of handheld drills and drill presses, making it suitable for workshop and maintenance tasks where precise metal drilling is required.

Advantages

The cobalt alloy tip increases hardness and retains cutting performance at elevated temperatures, resulting in longer tool life when working with harder steels. The cylindrical shank provides reliable grip in common chucks and allows easy replacement and repositioning. The 3.2 mm diameter offers a standard size for pilot holes and through‑holes in sheet metal, small components and assemblies.

Suitable for

• Drilling holes in mild steel, stainless steel and non‑ferrous metals
• Metal fabrication, repair and maintenance work
• Use with handheld electric drills and bench drill presses
• Pilot hole drilling for tapping and fastening operations

Key specifications

• Diameter: 3.2 mm
• Material: cobalt alloy cutting tip with high‑speed steel body
• Shank type: cylindrical (straight) shank compatible with standard chucks
• Application: metal drilling (ferrous and non‑ferrous)
• Typical use: suitable for handheld drills and drill presses

How to use

Select appropriate cutting speed and feed for the metal being drilled; lower speeds are recommended for stainless and hardened steels. Secure the workpiece firmly in a clamp or vice to prevent movement. Mark the drilling point and, if required, use a center punch to prevent bit walking. Apply steady pressure and allow the drill bit to cut without excessive force. Use cutting fluid or coolant when drilling harder metals to reduce heat and extend tool life. Withdraw the bit occasionally to remove chips and prevent clogging.

Usage recommendations

Use a compatible drill chuck tightened to the bit's cylindrical shank diameter, apply cutting fluid for stainless and hardened steels, and replace the bit when wear reduces cutting efficiency. Store the drill bit in a dry place away from corrosive environments.