GRAFF professional drill bit for stainless steel 3.5 mm from high-speed steel P6M5K5. These drill bits have accuracy class A1 thanks to their polished cutting edge.
A sharpening angle of cutting edge at the apex is 135 degrees. It provides ideal chip removal and, as a result, lower heating of the drill tip. Cross-shaped undercut of cutting edges at the apex allows to start drilling without predrilling with a centering drill or punching. Standard size drill bits are made according to DIN 338. They are equally suitable for industry, small workshops and households.
Drill size: – 3.5x39x70 mm where 3.5 mm is diameter, 39 mm is working length and 70 mm is total length.
A recommended operating speed for a drill bit with 3.5 mm diameter is 1675 RPM. Please note that this speed is specified for stainless steel. When processing other types of metal, speed differs.