Step drill for metal 7-32,5mm HSS-XE BLU with spiral groove, Karnasch

Cobalt step drill for metal, steel, stainless steel, acrylic glass and non-ferrous metals - for cable connections

Range: 7-32,5mm
Diameters: 7 - 10,5 - 12,5 - 14,5 - 16,5 - 18,5 - 20,5 - 23,5 - 25,5 - 30,5 - 32,5 mm
Number of edges: 2

Shank diameter: 12mm, with three flats against rotation in the chuck
Total length(incl. shank): 100mm

Max. drilled material thickness: 3mm / 6mm
Material: HSS-XE - high-alloy cobalt high-speed HSSE steel(68 HRC)
Coating: BLUE-DUR, increases drill life when drilling with very limited cooling(spray, paste), as well as for dry cutting

Cutting conditions - steel: 1000 to 250 rpm
Cutting conditions - stainless steel: 550 to 100 rpm
Smaller diameters can be drilled at higher speeds, as the drilling diameter increases, the cutting speed and speed need to be reduced. Failure to maintain the speed or overheating the drill may cause it to become dull.

Transitions to a larger diameter also perfectly needle the drilled hole.

Thanks to the spiral groove, the drilling is smooth, the chips do not stick, low cutting forces, the drilled material has fewer burrs and the tool has a longer endurance.