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Problems that originate from vibration are frequently encountered in boring and other operations, especially when machining with long overhangs. The vibrations may cause bad surface texture, insufficient accuracy, loss of productivity, increased insert and machine tool wear as well as noise.

Solving vibration problems will therefore always give you a productivity boost. 

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  • Productivity gains of 50–200%
  • Strong, optimized interface between bridge and dampened adapter
  • Improved surface finish
  • Improved process security
  • High penetration rates
  • Reduced cost per component



  • Silent Tools™ damper, for long tool assemblies, dimensioned for every adapter in the assortment
  • Short fine boring head in aluminum
  • Strong, optimized interface between bridge and dampened adapter
  • Internal coolant through the assembly
  • The optimized lightweight bridges (to be used with a dampened adapter) fit together with existing slides and cartridges for both rough and fine boring
  • Cartridge assortment for back boring applications, with a diameter range of 31–181 mm (1.220–7.126 inch)



  • Boring operations: roughing and finishing
  • Cutting data can be increased substantially thanks to the elimination of vibration

Dampened CoroBore® 820XL:

  • Radial depth of cut up to 8 mm (0.315 inch) (16 mm (0.630 inch) diameter increase) in low-alloy steel with twin-edge rough boring equipment
  • Maximum torque: 2,000 Nm (1,475 ft/lbs)



ISO application area


  • The entering angle should be close to 90 degrees to give greater axial cutting force and less radial/tangential force
  • Use large entering angles and small nose radii to reduce the radial forces, deflection and vibration
  • A small nose radius is ideal for small depths of cut and decreases the risk of vibrations
  • Use only one adaptive item between the Silent Tools™ adapter and the machine tool spindle, since further extension would reduce or completely ruin the performance
  • Use cutting units that are as light as possible to improve the dynamic behavior and effect of the damper
  • If possible, use a tapered shank
  • Productive boring: Two inserts with the same length and diameter to enable increasing feed
  • Step boring: Additional shim under one of the slides, if you want to take a large radial cut
  • Single-edge boring: Replace one of the slides with a cover to reduce cutting forces and achieve accurate roundness, good surface finish and close tolerances

Dampened CoroBore® 820XL:

Machine tools and spindle interfaces
Machine tools and spindle interfaces need to be strong and stable to hold large tools and assemblies such as CoroBore® 826D XL. Suitable interfaces are therefore HSK 100 and Coromant Capto® C8–C10. ISO 50 taper (BIG PLUS included) is too weak for these roughing tools.

Cutting data
The recommended start values for inserts and grades listed on the box should be followed, but be aware of the many parameters that have to be taken into consideration, such as actual workpiece material, spindle interface clamping force, torque capacity at a given RPM, net power,etc.


​Product range

Rough boring
Fine boring
Boring range
Ø 23–150 mm
(0.906–5.91 inch)
Boring range
Ø 148–300 mm
(5.827–11.811 inch)
Boring range
Ø 19–167 mm
(0.748–6.575 inch)
Boring range
Ø 148–315 mm
(5.827–12.402 inch)
CoroBore® BR20 Silent Tools™
CoroBore® 820D XL
CoroBore® 825
CoroBore® 825D XL/826D XL
Coromant Capto® back-end coupling
Coolant through
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