fraisa.com 325 i 90° 30° 135° Legend to the product page of drilling tools Internal cooling Drills with internal cooling show improved chip formation and better chip removal which in turn results in an improved tool life. Drills without internal cooling. Point angle and helix angle The point angle influences decisively the spectrum of materials that can be drilled. Further, small point angles bring a better centering behaviour; large point angles reduce the torque. Special versions and dimensions Indication of the point angle for center drills or counterbores. Counterbores 90° to DIN 335. Drilling depths Indication of the nominal drilling depth. (Example: 5xd: fi ve times drill diameter). The nominal drilling depth does not correspond to the maximum depth! The maximum drilling depth is specifi ed under Lmax. The helix angle influences decisively the rake angle on the major cutting edge (drill point) of the drill. Therefore, large helix angles are used for soft materials, small helix angles for hard and brittle materials. Versions and dimensions of spiral flute drills Spiral flute drills carbide, 3xd The dimensions of this tool correspond to DIN 6537 K «Spiral flute drills carbide with offset cylindrical shank». Spiral flute drills carbide, 5xd The dimensions of this tool correspond to DIN 6537 L «Spiral flute drills carbide with offset cylindrical shank». Spiral flute drills carbide and deep hole drills carbide, greater than 5xd According to company standard. Spiral flute drills carbide 8xd, optimised According to company standard, but with optimised l/d ratio for optimum tool stability.
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