Description
Version:Spiral fluted, with 4 guide chamfers and internal cooling channels.
New generation of high performance deep hole drills in the HPC range.
With 135° point angle and special h7 cutting edge tolerance for optimum generation of a deep hole.
High roundness and alignment accuracy of the deep hole.Note:Flute length LC = L2 + 1.
5 × DC.
For process reliability when using the 16×D deep-hole drill, an initial centre drilling with No.
121068 – 121130 or 4×D pilot drilling operation with pilot drill No.
122736 is necessary.
For deep holes greater than 20×D, a 6×D pilot hole with pilot drill No.
122736 is absolutely essential.
The generation of a pilot hole improves process reliability.
See also pages 129/130.
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