Counterbore, or counterbore cutters, are drill-bits used to make counterbore holes, which is a way of creating a flat-bottomed extension of an existing hole in a material. The counterbore cutter will essentially create a cylindrical cavity at the head of an already drilled hole. This allows the hole to accommodate flat bottomed screw or bolts so that they sit flush to the surface of the material, rather than protruding, while still able to perform their function to the fullest.

When would I need a Counterbore?

The reasons for desiring a counterbore of sunken screw are many. There are aesthetic reasons a manufacturer may want to hide the fixings, in furniture for example, but there are also aerodynamic reasons that are applicable to the aerospace industry.

Counterbores will often be made to be slightly larger than an accommodating bolt, to allow the use of socket wrenches or even screw caps.

Features of a Counterbore

  • Able to be used with conventional power tools

  • No protruding fixings.

  • Increase the aesthetic appeal of the finished product.

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Omschrijving Prijs Drill Bit Type Thread Size Pilot Diameter Pilot Length Cutter Diameter Cutter Length Shank Type Number of Pieces Shank Diameter Overall Length Material
RS-stocknr. 522-7430
FabrikantRS PRO
31,30 €
Aantal stuks
Counterbore M5 5.3mm 6.5mm 10mm 12.5mm Screwed 1 6 mm 70 mm HSS
RS-stocknr. 131-886
FabrikantRS PRO
12,81 €
Aantal stuks
Counterbore M3 3.4mm - 6mm 14mm Plain 1 5 mm 71 mm HSS