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 toolsNo protruding fixingsIncrease 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. 508-9036
Mfr. Part No.05841
BrandEXACT
TWD408.00
Each
units
M3 3.4mm - 6mm - Plain 5 mm 71 mm HSS
RS Stock No. 508-9250
Mfr. Part No.05845
BrandEXACT
TWD741.00
Each
units
M8 9mm - 15mm - Plain 12.5 mm 100 mm HSS
RS Stock No. 508-9266
Mfr. Part No.05844
BrandEXACT
TWD425.00
Each
units
M6 6.6mm - 11mm - Plain 8 mm 80 mm HSS
RS Stock No. 508-9244
Mfr. Part No.05846
BrandEXACT
TWD782.00
Each
units
M10 11mm - 18mm - Plain 12.5 mm 100 mm HSS
RS Stock No. 508-9272
Mfr. Part No.05843
BrandEXACT
TWD400.00
Each
units
M5 5.5mm - 10mm - Plain 8 mm 80 mm HSS
RS Stock No. 508-9288
Mfr. Part No.05842
BrandEXACT
TWD361.00
Each
units
M4 4.5mm - 8mm - Plain 5 mm 71 mm HSS