Description
For producing toleranced holes in steel or short-chipping materials.
Reliable complete machining without separate centring and without subsequent reaming process.
Significantly improved self-centring due to an additional pyramid tip for optimum roundness and tolerance accuracy of the hole that is produced.
Two drill cutting edges and four reaming cutting edges for an attractive surface quality of the wall of the bore.
Advantage
Centring, drilling and reaming are combined in a single operation.
Several work steps are combined and toleranced holes are produced faster and more efficiently.
The additional pyramid tip ensures optimum self-centring.
Two cutting edges take over the pre-machining and four reaming cutting edges ensure the required surface quality, roundness and dimensional accuracy of the hole in reaming quality.
Eliminating a separate reaming process significantly reduces direct production times and ancillary production times.
The cutting-edge geometry and guide chamfers permit precise and economical regrinding.
Product Data
Product type: Solid carbide drill-reamer with pyramid tip
Material: Solid carbide
Standard: Standard
Shank: Plain shank DIN 6535 HA
Shank tolerance: h6
Number of drill cutting edges: 2
Number of reaming cutting edges: 4
Point angle: 140°
Through-coolant pressure: 25 bar
Coating: TiAlN
Drilling depth: 5×D
Nominal Ø Dc: 8H7 mm
Tolerance: H7
L2: 41 mm
L: 91 mm
Ø Ds: 8 mm
Feed (f): 0.17 mm/rev
Cutting Data
Steel <500 N: 100 m/min
Steel <750 N: 90 m/min
Steel <900 N: 80 m/min
Steel <1100 N: 70 m/min
Steel <1400 N: 60 m/min
GG(G): 90 m/min
ISO Code
Alu plastics: N
Alu: N
Alu cast >10% Si: N
Steel <500 N: P
Steel <750 N: P
Steel <900 N: P
Steel <1100 N: P
Steel <1400 N: P
Steel <55 HRC: H
Steel <60 HRC: H
Steel <65 HRC: H
Steel <67 HRC: H
Steel <70 HRC: H
INOX <900 N: M
INOX >900 N: M
Ti >850 N: S
GG(G): K
Graphite / GRP / CRP: N
Tolerance Specifications
H7: Version for H7 bore tolerance.
±0.003 mm: Manufacturing or cutting tolerance of nominal Ø Dc.
Note
Flute length Lc = L2 + 1.5 × Dc.
HB and HE shanks are available at the same price as HA.
For HB shanks: use order No. 122797 + 129100HB.
For HE shanks: use order No. 122797 + 129100HE.