GRAFF professional drill bit for stainless steel 7 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: – 7x69x109 mm where 6.5 mm is diameter, 69 mm is working length and 109 mm is total length.
A recommended operating speed for a drill bit with 7 mm diameter is 810 RPM. Please note that this speed is specified for stainless steel. When processing other types of metal, speed differs.