| Ø D | 7,8 mm |
| L | 390 mm |
| l | 265 mm |
| Weight | 0,088 kg |
| Helix Angle | λ = 27°÷32° |
| Point angle | ε = 118° |
| Material | HSS - high-speed steel |
| Manufacturing Mode | V - ground from solid |
Usage
Extra long drills are recommended for deep-hole drilling by means of jig bushes of parts made of unalloyed or alloyed steel, cast steel up to 900 N/mm2, grey-, malleable- or nodular cast iron, sintered steel etc. It is necessary to prevent from flute-stopping by frequent withdrawing the drill. It is necessary to reduce the recommended cutting conditions regarding to the insufficient supply of the cutting fluid. |
| Surface Treatment | without treatment |
Grinding Mode
C - conical lip relief, split point - form C |
| Note | PROFI tools |
Attachment:
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