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. 673-8701
BrandRS PRO
SGD13.66
Each
units
Countersink 8.3mm 90° 3 HSS 50 mm 1 6 mm 38mm
RS Stock No. 423-876
BrandRS PRO
SGD14.06
Each
units
Countersink 6.3mm 90° 3 HSS 31 mm 1 7.15 mm 21.5mm
RS Stock No. 423-810
BrandRS PRO
SGD16.31
Each
units
Countersink 10.4mm 90° 3 HSS 34 mm 1 7.15 mm 21.5mm
RS Stock No. 508-9058
Mfr. Part No.05527
BrandEXACT
SGD122.72
1 Set
Set(s)
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. 123-1857
Mfr. Part No.104655
BrandWera
SGD177.04
Each
units
Countersink Set 6.3 mm, 8.3 mm, 10.4 mm, 12.4 mm, 16.5 mm, 20.5 mm 90° - HSS - 8 - -
RS Stock No. 123-1853
Mfr. Part No.104650
BrandWera
SGD187.17
Each
units
Countersink Set 6.3 mm, 8.3 mm, 10.4 mm, 12.4 mm, 16.5 mm, 20.5 mm - 3 - - 8 - -
RS Stock No. 508-8982
Mfr. Part No.05649
BrandEXACT
SGD150.00
1 Set
Set(s)
Countersink Set 20.5mm 90° 3 HSS - 9 - -
RS Stock No. 666-7416
Mfr. Part No.G13610.0
BrandDormer
SGD44.34
Each
units
Countersink 10mm 90° 3 HSS 50 mm 1 6 mm -
RS Stock No. 666-7426
Mfr. Part No.G13620.5
BrandDormer
SGD73.07
Each
units
Countersink 20.5mm 90° 3 HSS 63 mm 1 10 mm -
RS Stock No. 812-6018
Mfr. Part No.G2361
BrandDormer
SGD234.81
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. 508-9799
Mfr. Part No.05515
BrandEXACT
SGD15.16
Each
units
Countersink 12.4mm 90° 3 HSS 56 mm 1 8 mm -
RS Stock No. 666-7422
Mfr. Part No.G13616.5
BrandDormer
SGD59.38
Each
units
Countersink 16.5mm 90° 3 HSS 60 mm 1 10 mm -
RS Stock No. 666-7413
Mfr. Part No.G1368.0
BrandDormer
SGD38.60
Each
units
Countersink 8mm 90° 3 HSS 50 mm 1 6 mm -
RS Stock No. 508-8954
Mfr. Part No.05423
BrandEXACT
SGD28.46
Each
units
Countersink 21mm 90° - HSS-E 65 mm 1 - -
RS Stock No. 812-6030
Mfr. Part No.G57016.5
BrandDormer
SGD105.53
Each
units
Countersink 16.5mm 90° 3 HSS 60 mm 1 10 mm -
RS Stock No. 508-9008
Mfr. Part No.05645
BrandEXACT
SGD18.45
Each
units
Countersink 16.5mm 90° 3 HSS 40 mm 1 1/4 in -
RS Stock No. 508-9042
Mfr. Part No.05641
BrandEXACT
SGD11.79
Each
units
Countersink 6.3mm 90° 3 HSS 31 mm 1 1/4 in -
RS Stock No. 136-3945
Mfr. Part No.G10720.5
BrandDormer
SGD131.27
Each
units
Countersink 20.5mm 90° 3 HSS-E 50 mm 1 6.35 mm -
RS Stock No. 136-3943
Mfr. Part No.G10712.4
BrandDormer
SGD77.05
Each
units
Countersink 12.4mm 90° 3 HSS-E 50 mm 1 6.35 mm -
RS Stock No. 509-0036
Mfr. Part No.05510
BrandEXACT
SGD10.64
Each
units
Countersink 8.3mm 90° 3 HSS 50 mm 1 6 mm -
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