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.



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. 508-9288
Mfr. Part No.05842
BrandEXACT
$17.99
Each
units
Counterbore M4 4.5mm - 8mm - Plain HSS 1 5 mm 71 mm
RS Stock No. 508-9250
Mfr. Part No.05845
BrandEXACT
$38.17
Each
units
Counterbore M8 9mm - 15mm - Plain HSS 1 12.5 mm 100 mm
RS Stock No. 522-7474
BrandRS PRO
$89.02
Each
units
Counterbore M10 10.5mm 11mm 18mm 19mm Screwed HSS 1 10 mm 89 mm
RS Stock No. 132-019
BrandRS PRO
$305.78
Each
units
Counterbore Set M3 to M10 - - - - - HSS 12 - -
RS Stock No. 508-9238
Mfr. Part No.05863
BrandEXACT
$203.77
1 Set
Set(s)
Counterbore Set M3 to M10 - - - - - HSS 6 - -
RS Stock No. 132-025
BrandRS PRO
$191.58
Each
units
Counterbore Set M3 to M10 - - - - - HSS 6 - -
RS Stock No. 131-870
BrandRS PRO
$42.69
Each
units
Counterbore M6 6.6mm - 11mm 18mm Plain HSS 1 8 mm 80 mm
RS Stock No. 508-9244
Mfr. Part No.05846
BrandEXACT
$41.55
Each
units
Counterbore M10 11mm - 18mm - Plain HSS 1 12.5 mm 100 mm
RS Stock No. 522-7424
BrandRS PRO
$48.38
Each
units
Counterbore M4 4.3mm 5.5mm 8mm 12.5mm Screwed HSS 1 6 mm 65 mm
RS Stock No. 131-842
BrandRS PRO
$44.08
Each
units
Counterbore M5 5.5mm - 10mm 18mm Plain HSS 1 8 mm 80 mm
RS Stock No. 508-9036
Mfr. Part No.05841
BrandEXACT
$23.38
Each
units
Counterbore M3 3.4mm - 6mm - Plain HSS 1 5 mm 71 mm
RS Stock No. 132-031
BrandRS PRO
$85.66
Each
units
Counterbore M12 14mm - 20mm 22mm Plain HSS 1 12.5 mm 100 mm
RS Stock No. 131-858
BrandRS PRO
$54.42
Each
units
Counterbore M8 9mm - 15mm 22mm Plain HSS 1 12.5 mm 100 mm
RS Stock No. 522-7446
BrandRS PRO
$54.86
Each
units
Counterbore M6 6.4mm 8mm 11mm 12.5mm Screwed HSS 1 6 mm 76 mm
RS Stock No. 131-886
BrandRS PRO
$31.65
Each
units
Counterbore M3 3.4mm - 6mm 14mm Plain HSS 1 5 mm 71 mm
RS Stock No. 131-993
BrandRS PRO
$67.50
Each
units
Counterbore M10 11mm - 18mm 22mm Plain HSS 1 12.5 mm 100 mm
RS Stock No. 522-7480
BrandRS PRO
$115.40
Each
units
Counterbore M12 13mm 13.5mm 20mm 25.5mm Screwed HSS 1 12 mm 108 mm
RS Stock No. 508-9266
Mfr. Part No.05844
BrandEXACT
$21.87
Each
units
Counterbore M6 6.6mm - 11mm - Plain HSS 1 8 mm 80 mm
RS Stock No. 522-7452
BrandRS PRO
$80.75
Each
units
Counterbore M8 8.4mm 9.5mm 15mm 19mm Screwed Steel 1 10 mm 87.3 mm
RS Stock No. 522-7430
BrandRS PRO
$52.22
Each
units
Counterbore M5 5.3mm 6.5mm 10mm 12.5mm Screwed HSS 1 6 mm 70 mm
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