Version:
Cutting chisel edge with high centring accuracy due to strong core and special point geometry.
Particularly high alignment accuracy due to 4 guide chamfers which stabilise the drill even at extreme depths!
Convex cutting edges with honed edges and special flute profile for short chips, even on long chipping materials.
Advantage:
High process reliability and surface quality of the hole.
Note:
Flute length L
C = L
2 + 1.5 × D
C.
For process reliability when using the 12×D deep-hole drill, an initial centre drilling with No.
121068 –
121130 or 3×D pilot drilling operation with No.
122736 is necessary.
NEW GENERATION AVAILABLE!Recommended successor products are No. 123226 and 123236.