Version:
High concentricity.
Large section parabolic flutes; strong due to strengthened core thickness (without core taper).
≤ 16 mm ⌀: Bright finish flutes, nitrided lands; > 16 mm ⌀: Specially treated surface.
Special sturdy drills for extremely deep holes. Up to approx. 15×⌀ without drill withdrawal.
With point geometry shape A.
Recommendation:
Maximum drilling depth:
L2 = LC - 1.5 × DC.
Note:
For suitable reducing adapters for tools with MT shanks see
No. 343000-343530.