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庫存編號 132-025
BrandRS PRO
HK$1,028.28
單位
Counterbore Set M3 to M10 - - - - - HSS 6 - -
RS庫存編號 132-019
BrandRS PRO
HK$1,626.57
單位
Counterbore Set M3 to M10 - - - - - HSS 12 - -
RS庫存編號 522-7452
BrandRS PRO
HK$369.51
單位
Counterbore M8 8.4mm 9.5mm 15mm 19mm Screwed Steel 1 10 mm 87.3 mm
RS庫存編號 131-842
BrandRS PRO
HK$183.26
單位
Counterbore M5 5.5mm - 10mm 18mm Plain HSS 1 8 mm 80 mm
RS庫存編號 508-9250
製造零件編號05845
BrandEXACT
HK$197.34
單位
Counterbore M8 9mm - 15mm - Plain HSS 1 12.5 mm 100 mm
RS庫存編號 508-9272
製造零件編號05843
BrandEXACT
HK$106.51
單位
Counterbore M5 5.5mm - 10mm - Plain HSS 1 8 mm 80 mm
RS庫存編號 522-7430
BrandRS PRO
HK$236.81
單位
Counterbore M5 5.3mm 6.5mm 10mm 12.5mm Screwed HSS 1 6 mm 70 mm
RS庫存編號 508-9244
製造零件編號05846
BrandEXACT
HK$208.44
單位
Counterbore M10 11mm - 18mm - Plain HSS 1 12.5 mm 100 mm
RS庫存編號 522-7480
BrandRS PRO
HK$528.18
單位
Counterbore M12 13mm 13.5mm 20mm 25.5mm Screwed HSS 1 12 mm 108 mm
RS庫存編號 131-870
BrandRS PRO
HK$229.16
單位
Counterbore M6 6.6mm - 11mm 18mm Plain HSS 1 8 mm 80 mm
RS庫存編號 131-993
BrandRS PRO
HK$356.24
單位
Counterbore M10 11mm - 18mm 22mm Plain HSS 1 12.5 mm 100 mm
RS庫存編號 131-886
BrandRS PRO
HK$169.87
單位
Counterbore M3 3.4mm - 6mm 14mm Plain HSS 1 5 mm 71 mm
RS庫存編號 131-858
BrandRS PRO
HK$290.36
單位
Counterbore M8 9mm - 15mm 22mm Plain HSS 1 12.5 mm 100 mm
RS庫存編號 508-9266
製造零件編號05844
BrandEXACT
HK$113.14
單位
Counterbore M6 6.6mm - 11mm - Plain HSS 1 8 mm 80 mm
RS庫存編號 522-7424
BrandRS PRO
HK$226.28
單位
Counterbore M4 4.3mm 5.5mm 8mm 12.5mm Screwed HSS 1 6 mm 65 mm
RS庫存編號 508-9238
製造零件編號05863
BrandEXACT
HK$866.01
整套:1 個
Set(s)
Counterbore Set M3 to M10 - - - - - HSS 6 - -
RS庫存編號 522-7474
BrandRS PRO
HK$407.49
單位
Counterbore M10 10.5mm 11mm 18mm 19mm Screwed HSS 1 10 mm 89 mm
RS庫存編號 508-9288
製造零件編號05842
BrandEXACT
HK$96.10
單位
Counterbore M4 4.5mm - 8mm - Plain HSS 1 5 mm 71 mm
RS庫存編號 522-7446
BrandRS PRO
HK$248.71
單位
Counterbore M6 6.4mm 8mm 11mm 12.5mm Screwed HSS 1 6 mm 76 mm
RS庫存編號 131-864
BrandRS PRO
HK$171.78
單位
Counterbore M4 4.5mm - 8mm 14mm Plain HSS 1 5 mm 71 mm