Case Studies

Applying Counterbores to an Aluminum Cylinder Head in One Operation

Posted on: October 9, 2017
Tags: Automotive, Aluminum, Counterboring, BSF

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A manufacturer of motorsport engines was looking for a cost-effective solution for the application of counterbores.

back counterbore on cylinder head, counterboring tool

Application Details:

  • Through hole: Ø12.6mm
  • Counterbore backward: Ø22.0mm
  • Material: Aluminium die cast
automated back counterbore tool, BSF tool, Heule BSF tool


We have recommended our efficient HEULE BSF Back spot facing tool. For this counterbore, a customized BSF tool with a special working length of 80 mm has been designed.

Machining parameter:
Speed 2000 rpm, Cutting speed vc 140 m/min.
Feed 0.05 mm/rev.

To operate the BSF tool, an internal coolant with 20 bar pressure minimum is required.


By using the HEULE back spot facing tool the workpiece can be machined fully in one setup without reclamping or additional process step.

The customer is very satisfied by the result and the achieved time savings. The high spindle speed reduces the fluttering of the blade due to the interrupted cut considerably.

Interested in the BSF back spotfacing tool? Visit the BSF product page for more info. 

Need help selecting a tool? Visit our online Tool Selector and go to the Locate Agent page on our website to find your local technical sales representative. For more assistance, contact us at or 513-860-9900 and we'll be happy to point you in the right direction.