Drill bit GRAPHITE cobalt for metal, cylindrical shank, 10.2 mm, model 57H055

The GRAPHITE cobalt drill bit for metal with a 10.2 mm cutting diameter and a cylindrical shank is designed for drilling steel and other hard metals. Made with cobalt-enhanced cutting edges, the tool provides improved wear resistance and higher heat tolerance compared with standard high-speed steel bits. The cylindrical shank fits common handheld drills and drill presses, making the bit suitable for workshop, maintenance and light industrial use.

Advantages

The cobalt alloy cutting tip maintains hardness at elevated temperatures, reducing rapid wear during prolonged drilling in hard materials. The 10.2 mm diameter offers a precise bore size for metalworking tasks that require repeatable hole dimensions. A cylindrical shank ensures stable mounting in standard chucks and allows easy use in both portable and stationary drilling equipment. The bit’s geometry is optimized for chip evacuation and consistent penetration in steel and similar alloys.

Suitable for

• Drilling holes in mild and alloy steels
• Maintenance and repair tasks in workshops
• Production and fabrication where hard-metal drilling is required
• Use with handheld drills and drill presses

Key specifications

• Cutting diameter: 10.2 mm
• Material: cobalt-enhanced high-speed steel
• Shank type: cylindrical
• Intended materials: steel and other hard metals
• Suitable for: handheld drills and drill presses

How to use

Secure the cylindrical shank of the drill bit in the chuck and ensure firm clamping to prevent slipping. Select an appropriate drilling speed and feed rate for the workpiece material; lower speeds are generally recommended for harder steels to avoid overheating. Use cutting fluid or coolant to improve tool life and chip evacuation. Apply steady pressure and allow the bit to cut without excessive force; withdraw periodically to clear chips for deeper holes.

Usage recommendations

For best results, pre-center holes with a pilot drill when necessary, maintain recommended speeds for cobalt bits, and use suitable cutting fluid. Inspect the bit for wear before use and replace when the cutting edge shows significant rounding to maintain hole accuracy and reduce the risk of breakage.