Countersinks

Countersink cutter drill bits are designed to fit directly into manual, electric and cordless drill driver attachments and have hexagonal or round shanks. Countersink cutters are used to create a chamfer around the rim of a pilot hole enabling the head of a countersunk screw to sit flush. Countersink cutters can also be used to remove the burr left from a drilling or tapping operation.


Types of Countersink Cutters



  • Cross-Hole Countersink Cutter: These have a hole that goes through the side of the cone that provides the cutting edge. These countersink cutters are suitable for deburring and can also be used in soft materials such as wood or plastic to create a countersunk hole. The design of these countersink cutters means that they are free from mechanical vibration or 'chatter' and they also stay in the centre.

  • Fluted Countersink cutter: These have fluted blades that produce a heavy chamfer to create the correct seating for a countersunk-head screw. Countersink cutters are available with six different cutting angles but the most common are 82° and 90°. The number of flutes on the countersink cutter can also vary.

  • Single fluted: These have less chatter or mechanical vibration than multi-fluted and are ideal for use in small holes for general-purpose countersinking, chamfering and deburring. These are designed for machine use and light portable work when operating at higher speeds.

  • Three fluted: These are designed for a chatter-free performance and are used mainly in portable applications at slower speeds. The design of these countersinks gives them a good centring ability.

  • Four fluted: These have good radial relief

  • Five Fluted: These have a rugged design and the odd number of flutes minimises chatter

  • Six fluted: These are ideal for producing fast shearing cuts


These countersink cutter drill bits are made from HSS (High-Speed Steel) which can withstand high temperatures without losing its hardness.


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Description Price Drill Bit Type Head Diameter Countersink Angle Number of Flutes Material Overall Length Number of Pieces Shank Diameter Shank Length
RS Stock No. 136-3941
Mfr. Part No.G10710.4
BrandDormer
MYR252.68
Each
units
Countersink 10.4mm 90° 3 HSS-E 50 mm 1 6.35 mm -
RS Stock No. 136-3946
Mfr. Part No.G1066.3
BrandDormer
MYR160.09
Each
units
Countersink 6.3mm 90° 3 HSS 45 mm 1 5 mm -
RS Stock No. 812-6024
Mfr. Part No.G5708.3
BrandDormer
MYR240.40
Each
units
Countersink 8.3mm 90° 3 HSS 50 mm 1 6 mm -
RS Stock No. 136-3948
Mfr. Part No.G10610.4
BrandDormer
MYR192.84
Each
units
Countersink 10.4mm 90° 3 HSS 50 mm 1 6 mm -
RS Stock No. 136-3947
Mfr. Part No.G1068.3
BrandDormer
MYR168.36
Each
units
Countersink 8.3mm 90° 3 HSS 50 mm 1 6 mm -
RS Stock No. 136-3949
Mfr. Part No.G10612.4
BrandDormer
MYR217.72
Each
units
Countersink 12.4mm 90° 3 HSS 56 mm 1 8 mm -
RS Stock No. 136-3945
Mfr. Part No.G10720.5
BrandDormer
MYR485.48
Each
units
Countersink 20.5mm 90° 3 HSS-E 50 mm 1 6.35 mm -
RS Stock No. 136-3944
Mfr. Part No.G10716.5
BrandDormer
MYR357.91
Each
units
Countersink 16.5mm 90° 3 HSS-E 50 mm 1 6.35 mm -
RS Stock No. 812-6030
Mfr. Part No.G57016.5
BrandDormer
MYR390.28
Each
units
Countersink 16.5mm 90° 3 HSS 60 mm 1 10 mm -
RS Stock No. 812-6012
Mfr. Part No.G2363
BrandDormer
MYR1,084.72
Each
units
Countersink Set 6.3 mm, 8.3 mm, 10.4 mm, 12.4 mm, 16.5 mm, 20.5 mm 90° 3 HSS - 6 - -
RS Stock No. 136-3943
Mfr. Part No.G10712.4
BrandDormer
MYR284.98
Each
units
Countersink 12.4mm 90° 3 HSS-E 50 mm 1 6.35 mm -
RS Stock No. 812-6034
Mfr. Part No.G57020.5
BrandDormer
MYR479.71
Each
units
Countersink 20.5mm 90° 3 HSS 63 mm 1 10 mm -
RS Stock No. 666-7404
Mfr. Part No.G1366.3
BrandDormer
MYR117.47
Each
units
Countersink 6.3mm 90° 3 HSS 45 mm 1 5 mm -
RS Stock No. 666-7426
Mfr. Part No.G13620.5
BrandDormer
MYR264.36
Each
units
Countersink 20.5mm 90° 3 HSS 63 mm 1 10 mm -
RS Stock No. 812-6028
Mfr. Part No.G57010.4
BrandDormer
MYR275.68
Each
units
Countersink 10.4mm 90° 3 HSS 50 mm 1 6 mm -
RS Stock No. 666-7416
Mfr. Part No.G13610.0
BrandDormer
MYR145.43
Each
units
Countersink 10mm 90° 3 HSS 50 mm 1 6 mm -
RS Stock No. 812-6018
Mfr. Part No.G2361
BrandDormer
MYR774.82
Each
units
Countersink Set 6.3 mm, 8.3 mm, 10.4 mm, 12.4 mm, 16.5 mm, 20.5 mm 90° 3 HSS - 6 - -
RS Stock No. 136-3950
Mfr. Part No.G10616.5
BrandDormer
MYR273.35
Each
units
Countersink 16.5mm 90° 3 HSS 60 mm 1 10 mm -
RS Stock No. 136-3940
Mfr. Part No.G1078.3
BrandDormer
MYR220.38
Each
units
Countersink 8.3mm 90° 3 HSS-E 50 mm 1 6.35 mm -
RS Stock No. 666-7410
Mfr. Part No.G13610.4
BrandDormer
MYR143.30
Each
units
Countersink 10.4mm 90° 3 HSS 50 mm 1 6 mm -