Step drill for metal 4-20mm HSS-XE with spiral groove, Karnasch

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

Range: 4-20mm
Diameters: 4 - 6 - 8 - 10 - 12 - 14 - 16 - 18 - 20 mm
Number of pieces: 2

Shank diameter: 8mm, with three faces against in a glass box
Total length(vÄ. shank): 70mm

Max. thickness of drilled material: 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: 1600 up to 320 rpm
Cutting conditions - stainless steel: 800 to 160 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.