Twist drill made of high-speed steel (4241) with hardness 62°HRc (+/-2°) and with point angle 118°,
straight cut without thinning, good for hand grinding. Diameter tolerance h8.
Spiral dextrorotatory drill, spiral type N, fully ground edges, with high flexibility and torsional strength,
highly protected from fractures. Cylindrical shank matching drill's diameter.
The drill enables 20% quicker progress of drilling and 25% smaller feed force of cutting.
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.
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-340.
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 (metals) treatment.