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.
Note:
Flute length LC = L2 + 1.5 × DC.
To achieve good process reliability with 40×D and 50×D deep hole drills it is absolutely essential to drill a pilot hole with maximum drilling depth with drill No. 122736 and a 20×D co-pilot hole with a co-pilot drill No. 123691.The generation of a pilot hole improves process reliability.
Standard: Manufacturer's standard
Tolerance nominal ?: j6
Number of cutting edges Z: 2
Tolerance nominal ?: j6
recommended maximum drilling depth L2: 75.5 mm
Overall length L: 120 mm
Shank ? Ds: 6 mm
Feed f in steel < 900 N/mm2: 0.05 mm/rev.
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.
Note:
Flute length LC = L2 + 1.5 × DC.
To achieve good process reliability with 40×D and 50×D deep hole drills it is absolutely essential to drill a pilot hole with maximum drilling depth with drill No. 122736 and a 20×D co-pilot hole with a co-pilot drill No. 123691.The generation of a pilot hole improves process reliability.
Standard: Manufacturer's standard
Tolerance nominal ?: j6
Number of cutting edges Z: 2
Tolerance nominal ?: j6
recommended maximum drilling depth L2: 75.5 mm
Overall length L: 120 mm
Shank ? Ds: 6 mm
Feed f in steel < 900 N/mm2: 0.05 mm/rev.
