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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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. 132-019
BrandRS PRO
SGD286.14
Each
units
Counterbore Set M3 to M10 - - - - - HSS 12 - -
RS Stock No. 131-993
BrandRS PRO
SGD63.16
Each
units
Counterbore M10 11mm - 18mm 22mm Plain HSS 1 12.5 mm 100 mm
RS Stock No. 522-7430
BrandRS PRO
SGD48.87
Each
units
Counterbore M5 5.3mm 6.5mm 10mm 12.5mm Screwed HSS 1 6 mm 70 mm
RS Stock No. 132-025
BrandRS PRO
SGD179.27
Each
units
Counterbore Set M3 to M10 - - - - - HSS 6 - -
RS Stock No. 522-7446
BrandRS PRO
SGD51.34
Each
units
Counterbore M6 6.4mm 8mm 11mm 12.5mm Screwed HSS 1 6 mm 76 mm
RS Stock No. 131-870
BrandRS PRO
SGD36.32
Each
units
Counterbore M6 6.6mm - 11mm 18mm Plain HSS 1 8 mm 80 mm
RS Stock No. 131-886
BrandRS PRO
SGD26.93
Each
units
Counterbore M3 3.4mm - 6mm 14mm Plain HSS 1 5 mm 71 mm
RS Stock No. 131-858
BrandRS PRO
SGD50.92
Each
units
Counterbore M8 9mm - 15mm 22mm Plain HSS 1 12.5 mm 100 mm
RS Stock No. 522-7474
BrandRS PRO
SGD83.30
Each
units
Counterbore M10 10.5mm 11mm 18mm 19mm Screwed HSS 1 10 mm 89 mm
RS Stock No. 522-7424
BrandRS PRO
SGD45.27
Each
units
Counterbore M4 4.3mm 5.5mm 8mm 12.5mm Screwed HSS 1 6 mm 65 mm
RS Stock No. 522-7452
BrandRS PRO
SGD75.56
Each
units
Counterbore M8 8.4mm 9.5mm 15mm 19mm Screwed Steel 1 10 mm 87.3 mm
RS Stock No. 131-864
BrandRS PRO
SGD27.21
Each
units
Counterbore M4 4.5mm - 8mm 14mm Plain HSS 1 5 mm 71 mm
RS Stock No. 131-842
BrandRS PRO
SGD29.50
Each
units
Counterbore M5 5.5mm - 10mm 18mm Plain HSS 1 8 mm 80 mm
RS Stock No. 522-7480
BrandRS PRO
SGD107.99
Each
units
Counterbore M12 13mm 13.5mm 20mm 25.5mm Screwed HSS 1 12 mm 108 mm
RS Stock No. 132-031
BrandRS PRO
SGD80.16
Each
units
Counterbore M12 14mm - 20mm 22mm Plain HSS 1 12.5 mm 100 mm
RS Stock No. 508-9272
Mfr. Part No.05843
BrandEXACT
SGD18.06
Each
units
Counterbore M5 5.5mm - 10mm - Plain HSS 1 8 mm 80 mm
RS Stock No. 508-9266
Mfr. Part No.05844
BrandEXACT
SGD19.19
Each
units
Counterbore M6 6.6mm - 11mm - Plain HSS 1 8 mm 80 mm
RS Stock No. 508-9238
Mfr. Part No.05863
BrandEXACT
SGD161.02
1 Set
Set(s)
Counterbore Set M3 to M10 - - - - - HSS 6 - -
RS Stock No. 508-9036
Mfr. Part No.05841
BrandEXACT
SGD18.45
Each
units
Counterbore M3 3.4mm - 6mm - Plain HSS 1 5 mm 71 mm
RS Stock No. 508-9288
Mfr. Part No.05842
BrandEXACT
SGD17.35
Each
units
Counterbore M4 4.5mm - 8mm - Plain HSS 1 5 mm 71 mm
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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 ...