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CoroBore® 825

Fine boring tools for high-precision boring

Instructions

CoroBore® 825 cylindrical shank

  1. Cartridge
  2. Cylindrical shank

CoroBore® 825

  1. Cartridge
  2. Adaptor

CoroBore® 825 Silent Tools™

  1. Cartridge
  2. Damped adaptor

CoroBore® 825/826 

Both have the same coupling design between cartridge and cross slide, with an elliptical male/female part taking up tangential forces and a face part taking up radial forces.

Application tips

Choose the right EH shank for your application:

​ ​ ​ ​ ​
4×D
CoroBore® 825
Cylindrical shank​​		 4×D
CoroBore® 825 EH
Steel cylindrical​​		 5×D
CoroBore® 825 EH
Steel conical​ 		5×D
CoroBore® 825 EH
Solid carbide cylindrical		 6×D
CoroBore® 825 EH
Solid carbide conical​


  • A conical shank gives a straighter hole at long overhangs, regardless of which chuck is used
  • For a cylindrical shank, the best straightness is generally given by short overhangs
  • Choose conical solid carbide for overhangs up to 6×D
  • Choose heavy metal shanks for best stability and reduced vibration tendencies at short overhangs
EH coupling
Size Key width Torque
Nm ft-lbs
EH16 12 30 22
EH20 16 50 39
EH25 20 65 48

Recommendations

  • Choose a light cutting insert with a positive geometry for the best surface finish and close hole tolerance
  • First choice recommendation is the light cutting knife edge geometry (L-K) with nose radius 0.2 mm (0.008 inch)
  • Choose a small nose radius to minimize vibrations and cutting forces
  • Choose a nose radius smaller than the depth of cut
  • Wiper inserts can be used at high feeds under stable conditions to increase workpiece quality and productivity levels
  • Always adjust from a smaller diameter to a larger diameter to avoid backlash
  • Unlock locking screw before the adjustment, tighten afterwards
  • Use Coromant Capto® coupling for excellent repeatability and stability
  • Use CoroChuck® 930 for boring tools with cylindrical shanks for best pull-out security

Knowledge – How to apply


Exchangeable head (EH) recommendations

Recommendation for EH shanks at different length/diameter ratios:

3xDC 4xDC 5xDC 5.5xDC 6xDC 7xDC
Integrated CoroBore 825® cylindrical shank
Heavy metal (Densimet)
Cylindrical steel
Conical steel
Cylindrical solid carbide
Conical solid carbide
Recommended solution Vibration tendencies Not recommended


Start recommendations fine boring

Material Designation Vc
m/min
(ft/min)		 Ra 0.8 µm (31 µinch) Ra 1.6 µm (63 µinch)
Insert ap
mm
(inch)		 fn
mm/rev
(in/rev)		 Insert ap
mm
(inch)		 fn
mm/rev
(in/rev)
Steel 46MnVS6 180
(591)		 TCEX 110302-L-F 1125 0.2
(0.008)		 0.25
(0.010)
TCMT 110304-PF 4325 0.4
(0.016)		 0.09
(0.004)
 TCMT 110304-PF 4325 0.4
(0.016)		 0.13
(0.005)
Super Duplex F55 130
(427)		 TCMT 110304-MF 1125 0.4
(0.016)		 0.07
(0.003)		 TCMT 110304-MF 1125 0.4
(0.016)		 0.13
(0.005)
Titanium Ti6AI4V 50
(164)		 TCGX 110204-ALH10 0.4
(0.016)		 0.10
(0.004)		 TCGX 110204-ALH10 0.4
(0.016)		 0.13
(0.005)
Aluminium ALAS9U3Y40 270
(886)		 TCGX 110204-ALH10 0.4
(0.016)		 0.09
(0.004)		 TCGX 110204-ALH10 0.4
(0.016)		 0.13
(0.005)
Cast iron K3.2.C.UT 225
(738)		 TCMT 110304-PF 4325 0.4
(0.016)		 0.03
(0.001)		 TCMT 110304-PF 4325 0.4
(0.016)		 0.13
(0.005)


Coolant screws for CoroBore® 825

CoroBore 825 tool bodies with product codes that include Diameter range
(mm)
(inch)		 Screw N
(Key width)		 Key Option to close front coolant channel
AA18, AAA, AAB, FAA, FAB 19-36
(0.748–1.417)		 3214 010-100 DIN 913-M2x2 0.9 e.g. DIN 911-0.9* No
AAC, AAD, FAC, FAD 35-56
(1.378–2.205)		 3214 010-100 DIN 913-M2x2 0.9 e.g. DIN 911-0.9* Yes
AAE, AAF, AAG, LAF, LAG,FAE, FAF, FAG 55-107
(2.165–4.213)		 3214 010-202 DIN 913-M3x3 1.5 3021 012-015 Yes
AAH, AAI, FAH, FAI, LAH,LAI 106-167
(4.173–6.575)		 3214 010-252 DIN 913-M4x3 2 3021 012-020 Yes
5514 042-07 (to reduce the coolant hole) Similar to DIN 913-M4x3 (the same dimensions, but with center hole)

*Sandvik Coromant key not available

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