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Twist drill bit KWB 421140 5 pc(s)
Twist drill bits KWB 421140 set of 5 are HSS, precision-ground drills with a 1/4" hexagon shank to ISO 1173 (E 6.3) and a 135° tip angle. They are right-hand cut type N and have a natural (self) finish. The set is supplied in a hanging box for easy storage and fits cordless drivers, drills and bit holders with a 1/4" hexagon drive according to ISO 1173.
These KWB HSS twist drills offer precision-ground flutes for accurate hole positioning and consistent cutting performance. The 1/4" hex shank ensures secure engagement in quick-change chucks and bit holders, reducing slippage during use. The 135° tip provides better centring and longer life when drilling alloyed and mild steel, cast steel, die castings, sintered steel, non-ferrous metals and hard plastics.
Mount the drill bit securely in a compatible 1/4" hex quick-change chuck or directly into a cordless driver/drill with a 1/4" hexagon drive. Use appropriate drilling speed and feed for the material: lower speeds and steady pressure for hard metals and higher speeds for softer metals and plastics. Apply cutting fluid when drilling steel or alloyed materials to extend tool life and improve chip removal. Retract the bit occasionally to clear chips when drilling deeper holes.
For best results, choose a drill speed and lubricant suitable for the workpiece material; wear eye protection and follow safe drilling practices. Store the set in its hanging box to protect the cutting edges when not in use.
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