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Article no.: 123890 7,8
Solid carbide HPC deep hole drill plain shank DIN 6535 HA 20×D 7,8 mm
Article no.: 123690 7,8
Article code:
- Tool material: Solid carbide
- Standard: Manufacturer’s standard
- Version: 20×D
- Tolerance nominal ⌀: h7
- Number of cutting edges Z: 2
Product details
Technical Data
| Nominal ⌀ DC | 7.8 mm | |
| Coating | TiAlN | |
| Tool material | Solid carbide | |
| Standard | Manufacturer’s standard | |
| Version | 20×D | |
| Tolerance nominal ⌀ | h7 | |
| Number of cutting edges Z | 2 | |
| Point angle | 135 degrees | |
| recommended maximum drilling depth L2 | 168.3 mm | |
| Shank | DIN 6535 HA to h6 | |
| Through-coolant | yes, with 40 bar | |
| Machining strategy | HPC | |
| Pilot drill required | yes, pilot drill | |
| Flute length Lc | 180 mm | |
| Overall length L | 230 mm | |
| Shank ⌀ Ds | 8 mm | |
| Feed f in steel < 900 N/mm2 | 0.14 mm/rev. | |
| Colour ring | green | |
| Type of product | Jobber drill |
Identification numbers & Classifications
| Article number | 123690 7,8 | |
| EAN / GTIN | 4045197320308 | |
| Manufacturer number | 123690 7,8 |
Application Table
P
105
P
90
P
90
P
90
P
70
M
50
M
45
K
95
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.
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 – 121121 or 4×D pilot drilling operation with pilot drill No. 122736 is necessary. For deep holes greater than 20×D, a pilot hole to the maximum drilling depth with pilot drill No. 122736 is absolutely essential. The generation of a pilot hole improves process reliability. See also pages 140/141.
For process reliability when using the 16×D deep hole drill, an initial centre drilling with No. 121068 – 121121 or 4×D pilot drilling operation with pilot drill No. 122736 is necessary. For deep holes greater than 20×D, a pilot hole to the maximum drilling depth with pilot drill No. 122736 is absolutely essential. The generation of a pilot hole improves process reliability. See also pages 140/141.