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Orig. Hartner
In HSS-E steel, particularly treated for superior performance and long life. Ground and polished after hardening. Cutting geometry optimized for maximum chip evacuation.
Reinforced shank (from 7/16 inches, reduced shank), short chamfer for through and blind holes . Thread: American - UNC pitch - ANSI-B1.1 (DIN 371/376). Tolerance 2B. Right-hand use. With nitrided surface. For all types of cast iron and its alloys, non-ferrous short chipping metals and aluminum alloys with silicon (> 6%).
For Ø holes for tapping see technical tables and tips Art. 8400 G - 8500 G.