Version:
Strong core and special point geometry ensure the cutting chisel edges maintain high self-centring accuracy.
Straight cutting edges with slight edge hone and a special flute profile produce short chips.
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.