Drill bit for metal GRAPHITE 4.5 mm cobalt cylindrical 57H028

GRAPHITE cobalt drill bit for metal, 4.5 mm diameter with a cylindrical shank, is designed for drilling steel and other ferrous materials. The cobalt alloy composition increases heat resistance and wear life compared to standard high-speed steel bits. Intended for use with handheld drills and drill presses, this drill bit suits metalworking tasks where precision and tool durability are required.

Advantages

The cobalt construction provides improved hardness at elevated temperatures, reducing premature blunting during heavy or continuous drilling in hard metals. The cylindrical shank ensures secure clamping in standard chucks and allows quick change in portable and bench-mounted drills. The 4.5 mm diameter offers a common, versatile size for pilot holes, through-holes and preparatory drilling in fabrication and maintenance work.

Suitable for

• Drilling steel and other ferrous metals
• Metal fabrication and assembly
• Repair and maintenance of machinery and equipment
• Use with handheld electric drills and drill presses

Key specifications

• Material: cobalt alloy cutting tip / high-speed steel body
• Diameter: 4.5 mm
• Shank type: cylindrical
• Intended application: drilling ferrous metals
• Suitable tools: handheld drills and drill presses

How to use

Secure the drill bit in the chuck so that the cylindrical shank is fully seated and tightened. Select an appropriate cutting speed and feed rate for the metal being drilled; lower speeds are generally required for harder steels. Apply cutting lubricant or cooling fluid to reduce heat buildup and prolong tool life. Begin drilling with steady, moderate pressure, withdrawing periodically to clear chips when drilling deep holes. After use, clean chips and lubricant from the bit and store it in a protective case or holder.

Usage recommendations

Use cutting fluid when drilling stainless steel or hard alloys, avoid excessive speed, and replace the bit if wear causes poor hole quality. Ensure the drill and chuck are rated for the bit diameter and maintain firm, stable workpiece clamping for safe, accurate results.