12.4mm 90° HSS DIN335 FORMAT conical countersinkDIN335 HSS conical countersink, C-shape, 90° cylindrical shank, 12.4mm FORMATCone and 90° deburring countersinkMake: axially and radially ground, with deeply ground CBN. In addition, thanks to its rake and touchdown angles, it is suitable for most materials used. Purpose: for universal countersinking, chamfering and deburring without notches or burrs for countersunk screws according to DIN 963, DIN 964, DIN 965 and DIN 966 in one pass. Excellent cutting properties and trouble-free chip evacuation due to the tapered grinding and rake angle. The countersink achieves best results at high feed and low cutting speed. Note: for uncoated versions, sufficient coolant must be provided.Nominal Ø: 12.4 mm Smallest Ø: 2.8 mm Total length: 56 mm Shank Ø: 8 mm Brand: FORMAT steels < 700 N/mm²: recommended steels < 1000 N/mm² : recommended Aluminum < 8% silicon recommendedAluminum > 8% silicon: recommendedCopper alloys: recommended Coating: uncoated.