Drill bit for metal Art-Pol AR52085 — cobalt, cylindrical shank, 8.5 mm

Cobalt metal drill bit Art-Pol AR52085 with an 8.5 mm cutting diameter and a cylindrical shank designed for drilling hard metals and alloyed steels. The cobalt composition increases heat resistance and extends tool life under high-temperature and high-load conditions. The cylindrical shank provides secure clamping in standard chucks, making the bit suitable for use in hand drills and drill presses for metalworking tasks requiring precise, repeatable hole sizes.

Advantages

The cobalt alloy construction improves resistance to heat and abrasive wear compared with standard high-speed steel, allowing longer continuous drilling in tough materials. The 8.5 mm diameter offers a precise hole size for common metalworking applications, while the ground flutes and cutting geometry support efficient chip evacuation and reduced clogging. Compatibility with standard chucks and collets makes this cylindrical-shank bit versatile for workshop and maintenance environments.

Suitable for

• Drilling through-holes in alloyed steels and hardened metals
• Metal fabrication and assembly where precise hole diameters are required
• Maintenance and repair tasks involving hard metal components
• Use in hand drills and bench or floor drill presses

Key specifications

• Cutting diameter: 8.5 mm
• Material: cobalt alloy (enhanced heat resistance)
• Shank type: cylindrical shank for standard chucks
• Intended material: hard metals and alloyed steels
• Typical applications: through-holes, maintenance, fabrication

How to use

Secure the cylindrical shank in an appropriate chuck or collet, ensuring the bit is clamped straight and firmly. Select a suitable cutting speed and feed rate for the specific metal being drilled; lower speeds are generally appropriate for hardened alloys to reduce heat buildup. Use cutting fluid or lubricant to improve heat dissipation and chip evacuation. Apply steady pressure and allow the bit to cut without excessive force; withdraw periodically for chip clearing when drilling deeper holes.

Usage recommendations

For best results when drilling alloyed or hardened steels, use a dedicated cutting fluid, maintain moderate spindle speeds to limit overheating, and replace the bit when wear visibly affects hole quality. Ensure the drill press or hand drill is rigidly supported to maintain concentricity and extend bit life.