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. 136-3939
Mfr. Part No.G1076.3
BrandDormer
SGD96.04
Each
units
Countersink 6.3mm 90° 3 HSS-E 50 mm 1 6.35 mm -
RS Stock No. 812-6028
Mfr. Part No.G57010.4
BrandDormer
SGD74.54
Each
units
Countersink 10.4mm 90° 3 HSS 50 mm 1 6 mm -
RS Stock No. 812-6021
Mfr. Part No.G5706.3
BrandDormer
SGD69.70
Each
units
Countersink 6.3mm 90° 3 HSS 45 mm 1 5 mm -
RS Stock No. 508-9064
Mfr. Part No.05520
BrandEXACT
SGD25.47
Each
units
Countersink 20.5mm 90° 3 HSS 63 mm 1 10 mm -
RS Stock No. 508-8932
Mfr. Part No.05642
BrandEXACT
SGD13.25
Each
units
Countersink 8.3mm 90° 3 HSS 31 mm 1 1/4 in -
RS Stock No. 305-4505
Mfr. Part No.3525HB
BrandBahco
SGD33.15
Each
units
Countersink - - - - - 1 - -
RS Stock No. 136-3947
Mfr. Part No.G1068.3
BrandDormer
SGD51.34
Each
units
Countersink 8.3mm 90° 3 HSS 50 mm 1 6 mm -
RS Stock No. 666-7410
Mfr. Part No.G13610.4
BrandDormer
SGD39.61
Each
units
Countersink 10.4mm 90° 3 HSS 50 mm 1 6 mm -
RS Stock No. 508-8998
Mfr. Part No.05646
BrandEXACT
SGD14.25
Each
units
Countersink 20.5mm 90° 3 HSS 41 mm 1 1/4 in -
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. 499-407
Mfr. Part No.4405715
BrandEXACT
SGD22.35
Each
units
Countersink 12.4mm 90° 3 HSS-E 56 mm 1 8 mm -
RS Stock No. 508-9014
Mfr. Part No.05426
BrandEXACT
SGD126.28
1 Set
Set(s)
Countersink Set 2 mm, 5 mm, 10 mm, 15 mm, 20 mm 90° - HSS-E - 4 - -
RS Stock No. 812-6037
Mfr. Part No.G57012.4
BrandDormer
SGD76.05
Each
units
Countersink 12.4mm 90° 3 HSS 56 mm 1 8 mm -
RS Stock No. 136-3946
Mfr. Part No.G1066.3
BrandDormer
SGD43.28
Each
units
Countersink 6.3mm 90° 3 HSS 45 mm 1 5 mm -
RS Stock No. 508-9092
Mfr. Part No.05644
BrandEXACT
SGD15.42
Each
units
Countersink 12.4mm 90° 3 HSS 35 mm 1 1/4 in -
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 -
RS Stock No. 508-9070
Mfr. Part No.05518
BrandEXACT
SGD14.28
Each
units
Countersink 16.5mm 90° 3 HSS 60 mm 1 10 mm -
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. 194-7921
Mfr. Part No.D-42204
BrandMakita
SGD95.88
1 Set
Set(s)
Countersink Set 6.3 mm, 8.3 mm, 10.4 mm, 12.4 mm, 16.5 mm, 20.5 mm - - - - 6 - -
RS Stock No. 136-3940
Mfr. Part No.G1078.3
BrandDormer
SGD59.59
Each
units
Countersink 8.3mm 90° 3 HSS-E 50 mm 1 6.35 mm -