Back to counterboring


Front and back counterboring  and backspotfacing in one single pass. Interrupted cutting possible

  • Extremely robust system, also for materials that are difficult to machine
  • Field of application from bore diameter 6.0 mm
  • Maximum counterbore diameter 49.0 mm
SOLO | Catalogue
pdf ・ 1,8 MB
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The SOLO counterboring tool is available in two variants. On the one hand, there is SOLO for machining materials at high cutting speeds and on the other, SOLO2 for machining at low cutting speeds. 

Blade position at spindle stopRetractedExtended
Run-in speedSpindle stop1,900 rpm
Exit speed1,900 rpmSpindle stop
Processing speed> 1,900 rpm0 – 1,500 rpm

Since both systems are tailored to the customer-specific application, there is no standardised range. We would be pleased to advise you on your particular solution. 


With SOLO and SOLO2, HEULE offers extremely robust counterboring tool systems. The combination of a mechanical process steps description and simple construction guarantees maximum process reliability and minimal maintenance. Externally, the two systems are nearly identical. However, the mechanical setup is different.


The control unit and shank are standard on both variants. Blade housing, blade control and blade are custom-designed to meet customer requirements. The control unit contains two centrifugal weights and is sealed against dirt and coolant. The manually replaceable carbide blade’s cutting geometry and coating are material-specific.

Tool Concept
  1. Blade
  2. Blade control
  3. Blade housing
  4. Centre ring
  5. Tool head
  6. Shank
  7. Clamping screw
Arbeitsweise Senkwerkzeug SOLO

Process steps description

The SOLO counterboring tool can be used quickly without a torque support or any machine adaptation. The counterboring is done from the same side as the previous bore machining. Using the centrifugal force generated by the activation speed, the manually replaceable cutting edge is reliably extended.


When the spindle is stopped, the integrated centrifugal weights are located in the centre of the control unit. The centrifugal weights move outwards to the stop when the spindle is activated at the activation speed. When the spindle stops, the centrifugal weights are returned to their initial position by return springs. This radial movement is converted into a rotary movement and transmitted to the blade control by a gear. An eccentrically positioned bolt in the blade control engages in a groove on the blade. As soon as the blade control rotates, the blade held by the blade housing so that it can be moved is radially retracted or extended. This blade extension and retraction occurs instantly and without delay.


Visit our downloads section for detailed information, videos and operating instructions.

Sample applications
Counterboring tool in use
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Low-pressure turbine stator housing | 75% reduction in machining time per bore.
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Components for tractor gearboxes | With the complete solution, the customer processes 8 components per re-clamping.
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Chain wheel drum | Process-reliable counterboring solution for bolt connections.
Would you like specific consulting?

We are pleased to assist.

Thanks to our worldwide sales network with multiple locations and approximately 50 sales partners in 35 countries, we are quickly and competently available to you.


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