Coffret de forets KWB 424140

The KWB 424140 drill bit set contains 13 right-hand spiral drill bits, roll-forged and steam-hardened with a blue-black finish. Each bit has a Type N geometry and a 118° tip angle, suitable for drilling into alloyed and mild steel, castings, non-ferrous metals and hard plastics. The set is supplied in a hanging box for organised storage and easy access.

Advantages

Roll-forged construction offers increased strength and wear resistance, while steam hardening improves durability. The blue-black surface treatment reduces corrosion. Type N geometry with a 118° tip provides good centring and stable chip formation across a variety of materials. Right-hand rotation is compatible with standard drills.

Suitable for

Key specifications

How to use

Select the appropriate drill bit size from the set and secure it in the drill chuck. Use right-hand rotation at a speed suitable for the material: higher speeds for non-ferrous metals and plastics, lower speeds for alloyed or mild steel and castings. Apply steady, perpendicular feed pressure and use cutting fluid when drilling steel or castings to improve tool life and hole quality. Withdraw the bit occasionally to clear chips when drilling deep holes.

Recommendations

For best results, match drill speed and feed to the material, use appropriate cooling or lubrication for metals, and clamp the workpiece securely. Replace worn bits to maintain hole accuracy and reduce heat build-up.