Kierreporsas KWB 209630 2 kpl oikeakätinen

Twist drill bit KWB 209630 set contains two roll-forged DIN 338 type N bits for right-hand rotation, finished in blue-black and steam-hardened. The tips are ground to a 118° angle and are suitable for drilling alloyed and mild steel, castings, non-ferrous metals and hard plastics.

Advantages

The roll-forged construction and steam hardening increase toughness and wear resistance while maintaining cutting precision. The DIN 338 type N geometry with a 118° tip angle provides stable centring and reliable chip removal across a range of common workshop materials. The blue-black finish offers corrosion protection and reduces friction during drilling.

Suitable for

Key specifications

How to use

Secure the drill bit firmly in the chuck of a drill or drill press and clamp the workpiece. Select an appropriate spindle speed for the material being drilled (lower speeds for harder materials, higher for softer metals and plastics). Use cutting fluid when drilling steels and castings to reduce heat and extend tool life. Apply steady feed pressure and withdraw the bit periodically to clear chips when drilling deep holes.

Recommendations

For best results, match drill speed and lubrication to the material: use cutting oil for steels and castings, moderate speed for alloyed steels, and higher speed with light lubrication for non-ferrous metals and plastics. Inspect bits regularly and replace when worn to maintain hole quality.