Step drill for metal 7-40,5mm HSS-XE with spiral groove, Karnasch

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

Range: 7-40,5mm
Diameters: 7 - 10.5 - 12.5 - 14.5 - 16.5 - 18.5 - 20.5 - 23.5 - 25.5 - 30.5 - 32.5 - 38.5 - 40.5 (40.5 needling diameter) mm
Number of edges: 2

Shank diameter: 12mm, with three anti-rotation faces in the chuck
Overall length (incl. shank): 115mm

Max. thickness of drilled material: 4mm / 6mm
Material: HSS-XE - high-alloy cobalt high-speed HSSE steel (68 HRC)
Coating: BLUE-DUR, increases the life of the drill when drilling with very limited cooling (spray, paste), as well as when cutting dry

Cutting conditions - steel: 1000 to 160 rpm
Cutting conditions - stainless steel: 450 to 100 rpm
Smaller diameters can be drilled at higher speeds, with increasing drilling diameter it is necessary to reduce the cutting speed and speed. Failure to maintain the speed or overheating the drill may cause it to become dull.

At the same time, transitions to a larger diameter 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 life.