Drill bit GRAPHITE HSS for metal 8 mm, DIN 338

GRAPHITE HSS twist drill bit for metal with an 8 mm diameter manufactured to DIN 338 specifications. Made from high-speed steel (HSS) and ground to a standard geometry for general metalworking, this drill bit is intended for cutting through steel and other common metals. It is suitable for use with hand-held drills and drill presses and offers a balance of hardness and toughness for workshop and professional applications.

Advantages

The HSS material provides elevated hardness and heat resistance during cutting, which helps maintain edge integrity and reduces wear. DIN 338 ground geometry ensures consistent centring and chip evacuation for typical metal drilling tasks. The 8 mm diameter is a common size that is compatible with standard chucks and suited to a wide range of fastening and clearance hole requirements. The drill bit's construction supports stable cutting performance across repeated use.

Suitable for

• Drilling holes in mild and medium-strength steel
• Working with common non-ferrous metals such as aluminum and brass
• Use in hand drills for on-site tasks
• Use in drill presses for accurate workshop drilling

Key specifications

• Material: High-speed steel (HSS)
• Diameter: 8 mm
• Standard: DIN 338 (twist drill geometry)
• Intended use: Metal drilling
• Shank type: Cylindrical shank compatible with standard chucks
• Finish: Ground cutting edges for general-purpose metalworking

How to use

Select appropriate rotational speed and feed rate for the material and drill size, reducing speed for harder steels and increasing speed for softer metals. Secure the workpiece with clamps or a vice to prevent movement and ensure alignment. Use cutting fluid or lubricant when drilling steel to reduce heat and extend tool life. Start drilling with light pressure to establish a centre, then apply steady force while maintaining proper coolant or lubrication. Clear chips as necessary and withdraw the drill intermittently in deep holes to improve chip evacuation.

Usage recommendations

For best results, use the 8 mm HSS drill bit with moderate speed and cutting fluid on steel; avoid excessive feed that can cause premature wear. Re-sharpen or replace the bit when edges become dull to maintain hole quality and reduce risk of breakage. When drilling through hardened steels or stainless materials, consider using a specialized coated or carbide tool designed for those applications.