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 and Benefits:
•Able to be used with conventional power tools


•No protruding fixings


•Increase aesthetic appeal of finished product

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Description Price Thread Size Pilot Diameter Pilot Length Cutter Diameter Cutter Length Shank Type Shank Diameter Overall Length Material
RS Stock No. 522-7452
BrandRS PRO
TWD1,526.00
Each
units
M8 8.4mm 9.5mm 15mm 19mm Screwed 10 mm 87.3 mm Steel
RS Stock No. 522-7424
BrandRS PRO
TWD958.00
Each
units
M4 4.3mm 5.5mm 8mm 12.5mm Screwed 6 mm 65 mm HSS
RS Stock No. 522-7480
BrandRS PRO
TWD2,181.00
Each
units
M12 13mm 13.5mm 20mm 25.5mm Screwed 12 mm 108 mm HSS
RS Stock No. 131-864
BrandRS PRO
TWD672.00
Each
units
M4 4.5mm - 8mm 14mm Plain 5 mm 71 mm HSS
RS Stock No. 522-7474
BrandRS PRO
TWD1,682.00
Each
units
M10 10.5mm 11mm 18mm 19mm Screwed 10 mm 89 mm HSS
RS Stock No. 508-9288
Mfr. Part No.05842
BrandEXACT
TWD378.00
Each
units
M4 4.5mm - 8mm - Plain 5 mm 71 mm HSS
RS Stock No. 522-7430
BrandRS PRO
TWD987.00
Each
units
M5 5.3mm 6.5mm 10mm 12.5mm Screwed 6 mm 70 mm HSS
RS Stock No. 131-886
BrandRS PRO
TWD664.00
Each
units
M3 3.4mm - 6mm 14mm Plain 5 mm 71 mm HSS
RS Stock No. 522-7446
BrandRS PRO
TWD1,036.00
Each
units
M6 6.4mm 8mm 11mm 12.5mm Screwed 6 mm 76 mm HSS
RS Stock No. 131-858
BrandRS PRO
TWD1,135.00
Each
units
M8 9mm - 15mm 22mm Plain 12.5 mm 100 mm HSS
RS Stock No. 131-993
BrandRS PRO
TWD1,394.00
Each
units
M10 11mm - 18mm 22mm Plain 12.5 mm 100 mm HSS
RS Stock No. 508-9272
Mfr. Part No.05843
BrandEXACT
TWD419.00
Each
units
M5 5.5mm - 10mm - Plain 8 mm 80 mm HSS
RS Stock No. 508-9244
Mfr. Part No.05846
BrandEXACT
TWD820.00
Each
units
M10 11mm - 18mm - Plain 12.5 mm 100 mm HSS
RS Stock No. 508-9250
Mfr. Part No.05845
BrandEXACT
TWD776.00
Each
units
M8 9mm - 15mm - Plain 12.5 mm 100 mm HSS
RS Stock No. 131-842
BrandRS PRO
TWD716.00
Each
units
M5 5.5mm - 10mm 18mm Plain 8 mm 80 mm HSS
RS Stock No. 131-870
BrandRS PRO
TWD896.00
Each
units
M6 6.6mm - 11mm 18mm Plain 8 mm 80 mm HSS
RS Stock No. 508-9036
Mfr. Part No.05841
BrandEXACT
TWD427.00
Each
units
M3 3.4mm - 6mm - Plain 5 mm 71 mm HSS
RS Stock No. 508-9266
Mfr. Part No.05844
BrandEXACT
TWD445.00
Each
units
M6 6.6mm - 11mm - Plain 8 mm 80 mm HSS