Counterbores

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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Viewing 21 - 22 of 22 products
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Description Price Drill Bit Type Thread Size Pilot Diameter Pilot Length Cutter Diameter Cutter Length Shank Type Material Number of Pieces Shank Diameter Overall Length
RS Stock No. 508-9266
Mfr. Part No.05844
BrandEXACT
MYR74.16
Each
units
Counterbore M6 6.6mm - 11mm - Plain HSS 1 8 mm 80 mm
RS Stock No. 508-9288
Mfr. Part No.05842
BrandEXACT
MYR62.92
Each
units
Counterbore M4 4.5mm - 8mm - Plain HSS 1 5 mm 71 mm
Related Products
Counterbores for cutting holes where a capscrew or ...
Description:
Counterbores for cutting holes where a capscrew or fastener is required to sit flush or even below the level of the workpiece. Thread size is the size of the screw thread to sit within the hole and cutting diameter shows ...