Twist drills made of high-speed steel (M35) with hardness 66°HRc (+/-1°) and with point angle 135°,
cut with thinning, which gives self-centering features without necessity of punching or spot drilling.
Spiral dextrorotatory drills, spiral type N, fully ground edges, with a high flexibility and torsional strength,
highly protected from fractures. Diameter tolerance h8.
Cylindrical shanks matching drills' diameter.
The drills enable 40% quicker progress of drilling and 50% smaller feed force of cutting.
Structure of cutting material reinforced by 5% cobalt alloy (Co), ensures small friction factor and reduces
the danger of chips sticking to drills, what enlarges drilling capacity.
Chemical and thermal process of hardening and precisely sharpened split point reduce drills' wear
and enlarge durability on inside stresses which appear while using.
Suitable for industrial purposes, for alloy and carbon steels treatment with tensile strength up to 900 N/mm²,
stainless steel, heat and acid proof steel, grey cast iron, cast steels, titanium and its alloys.
According to DIN-1412 C.
Necessarily use it together with coolant. The drills are recommended for stationary usage (work),
with using drill stand, drill presses, lathe chucks or face milling cutters.