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 900N/mm², grey-, malleable- or modular 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 Form C – conical lip relief, split point - form C
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