Twist drill made of high-speed steel (4241) with hardness 62°HRc (+/-2°) and with point angle 135°,
cut with thinning, which gives self-centering features without necessity of punching or spot drilling.
Spiral dextrorotatory drill, spiral type N, fully ground edges, with high flexibility and torsional strength,
highly protected from fractures. Diameter tolerance h8.
Cylindrical shank matching drill's diameter.
The drill's surface is coated with oxide layer, what ensures small friction factor and reduces the danger
of chips sticking to drill, what enlarges drilling capacity.
The drill enables 20% quicker progress of drilling and 25% smaller feed force of cutting.
Chemical and thermal process of hardening and precisely sharpened split point reduce drill's wear
and enlarge durability on inside stresses which appear while using.
Suitable for workshop purposes, for alloy and carbon steels treatment with tensile strength up to 900 N/mm²,
malleable cast iron and grey cast iron, iron sinters, non-ferrous metals as well as hardened plastics.
According to DIN-1869-I.
Use it together with coolant.
Recommended coolants: drilling emulsion, cutting fluid, ester based oil.
While using right coolant drill's durability quadruples.
Selection of right coolant depends on kind of materials treatment.