Drill bit GRAPHITE 57H052 cobalt for metal, cylindrical shank, 9.5 mm

The GRAPHITE 57H052 cobalt drill bit is a 9.5 mm diameter metalworking drill with a cylindrical shank, engineered for drilling hardened steels and common metals. Its high-cobalt composition increases heat resistance and hardness, extending cutting life when used in hand drills and drill presses. The bit provides reliable performance for workshop, industrial and maintenance tasks requiring precise, repeatable holes in metal components.

Advantages

The cobalt alloy construction offers improved wear resistance and thermal stability compared with conventional HSS bits, enabling drilling at higher speeds and under greater thermal load. The 9.5 mm diameter and ground tip geometry support accurate hole positioning and reduced walking at the start of drilling. The cylindrical shank fits standard drill chucks, allowing secure clamping and versatility between portable drills and bench-mounted machines.

Suitable for

• Drilling hardened steels and heat-treated metal parts
• General metal fabrication and repair work
• Workshop maintenance and mechanical servicing
• Use in hand drills and drill presses for precision holes

Key specifications

• Material: high-cobalt alloy (cobalt-enhanced high-speed steel)
• Diameter: 9.5 mm
• Shank type: cylindrical shank for standard chucks
• Intended use: metal drilling, including hardened steels
• Tip geometry: ground for reduced walking and improved centering

How to use

Select an appropriate drilling speed and apply steady feed pressure consistent with the workpiece material and drill diameter. Secure the workpiece to prevent movement and center-punch the drilling position to improve accuracy. Use cutting fluid or coolant when drilling hardened steels to reduce heat buildup and prolong tool life. After drilling, clear chips frequently and inspect the cutting edge for wear before continued use.

Usage recommendations

For best results when drilling hardened metals, use moderate to high spindle speeds with adequate coolant, avoid excessive side forces, and replace the bit if chipping or excessive wear is observed to maintain hole quality and operator safety.