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. 423-816
BrandRS PRO
SGD22.71
Each
units
Countersink 12.4mm 90° 3 HSS 36 mm 1 7.15 mm 21.5mm
RS Stock No. 218-674
BrandRS PRO
SGD21.17
Each
units
Countersink 8mm 90° 3 HSS - 1 - -
RS Stock No. 456-905
BrandRS PRO
SGD69.06
Each
units
Countersink 25mm 90° 3 HSS 145 mm 1 - -
RS Stock No. 215-445
BrandRS PRO
SGD47.17
Each
units
Countersink 15mm 90° - HSS 65 mm 1 10 mm 37.5mm
RS Stock No. 423-822
BrandRS PRO
SGD38.97
Each
units
Countersink 20.5mm 90° 3 HSS 43 mm 1 7.15 mm 21.5mm
RS Stock No. 218-652
BrandRS PRO
SGD25.14
Each
units
Countersink 12mm 90° 3 HSS - 1 - -
RS Stock No. 218-646
BrandRS PRO
SGD33.62
Each
units
Countersink 16mm 90° 3 HSS - 1 - -
RS Stock No. 218-668
BrandRS PRO
SGD23.64
Each
units
Countersink 10mm 90° 3 HSS - 1 - -
RS Stock No. 562-533
BrandRS PRO
SGD24.06
Each
units
Countersink 10mm 90° 5 HSS 39 mm 1 6.35 mm 20.5mm
RS Stock No. 423-838
BrandRS PRO
SGD19.31
Each
units
Countersink 15.3mm 90° 5 HSS 32 mm 1 7.15 mm 21.5mm
RS Stock No. 423-872
BrandRS PRO
SGD20.36
Each
units
Countersink 8.3mm 90° 3 HSS 32 mm 1 7.15 mm 21.5mm
RS Stock No. 218-624
BrandRS PRO
SGD55.62
Each
units
Countersink 25mm 90° 3 HSS - 1 - -
RS Stock No. 215-439
BrandRS PRO
SGD29.59
Each
units
Countersink 10mm 90° - HSS 48 mm 1 8 mm 30.5mm
RS Stock No. 215-489
BrandRS PRO
SGD27.80
Each
units
Countersink 10mm 90° - HSS 48 mm 1 8 mm 30.5mm
RS Stock No. 423-810
BrandRS PRO
SGD19.19
Each
units
Countersink 10.4mm 90° 3 HSS 34 mm 1 7.15 mm 21.5mm
RS Stock No. 673-8701
BrandRS PRO
SGD16.07
Each
units
Countersink 8.3mm 90° 3 HSS 50 mm 1 6 mm 38mm
RS Stock No. 218-589
BrandRS PRO
SGD18.28
Each
units
Countersink 16mm 90° 5 HSS - 1 - -
RS Stock No. 423-832
BrandRS PRO
SGD22.08
Each
units
Countersink 10.4mm 90° 5 HSS 31 mm 1 7.15 mm 21.5mm
RS Stock No. 423-850
BrandRS PRO
SGD43.10
Each
units
Countersink 21mm 90° - HSS 65 mm 1 7.15 mm 20mm
RS Stock No. 673-8710
BrandRS PRO
SGD36.47
Each
units
Countersink 20.5mm 90° 3 HSS 63 mm 1 10 mm 42mm
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