Description
Version:
Helical fluted, with 4 guide chamfers and internal coolant holes. New generation of high performance co-pilot drills in the HPC range. With 138° point angle and special j6 cutting edge tolerance for optimum generation of a co-pilot hole. High roundness and alignment accuracy of the co-pilot hole.
Recommendation:
Maximum drilling depth:
Flute length (see table) less 1.5×nominal ⌀.
Flute length (see table) less 1.5×nominal ⌀.
Note:
To achieve good process reliability with 40×D and 50×D deep-hole drills it is absolutely essential to drill 6×D pilot hole with a No. 122736 and a 20×D co-pilot hole with a No. 123691 co-pilot drill.
The generation of a pilot hole improves the process reliability. See also pages 116/117.
The generation of a pilot hole improves the process reliability. See also pages 116/117.
