Step drill for metal 6-30mm HSS-XE with spiral groove, Karnasch

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

Range: 6-30mm
Diameters: 6 - 8 - 10 - 12 - 14 - 16 - 18 - 20 - 22 - 24 - 26 - 28 - 30 -(32needing diameter) mm
Number of runs: 2

Shank diameter: 10mm, with three anti-twist surfaces in the glass
Total length(vě. shank): 98mm

Max. drilled material thickness: 4mm
Material: HSS-XE - high-alloy cobalt high-speed HSSE steel(68 HRC)
Coating: BLUE-DUR, increase Drill life during drilling with very limited cooling(spray, paste), as well as dry cutting

Cutting conditions - Steel: 1100 up to 260 rpm
Cutting conditions - stainless steel: 550 to 120 rpm
Smaller diameters can be drilled at higher speeds , with the increasing diameter of the drilling, it is necessary to reduce the cutting speed and speed. Failure to observe the speed or overheating the drill may cause it to become dull.

Transitions to a larger diameter at the same time perfectly needle a drilled hole.

Thanks to the spiral groove, the drilling is smooth, the chips do not stick, it causes low cutting forces, the drilled material has less rotation. The tool has a longer life.