Page 349 - Carbide drills I Thread cutting tools 2023

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.
135°

30° 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.

Special versions and dimensions
Indication of the point angle for center drills or counterbores.
Counterbores 90° to DIN 335.
90°

i
Drilling depths
Indication of the nominal drilling depth. (Example: 5xd: five times drill diameter).
The nominal drilling depth does not correspond to the maximum depth! The maximum drilling depth is
specified under L max .

fraisa.com
347