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 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
  1. 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 on centre.
  2. 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 using 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 centering 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

Materials
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 Head Diameter Countersink Angle Number of Flutes Material Overall Length Shank Diameter Shank Length
RS Stock No. 218-573
BrandRS PRO
$29.74
Each
units
20mm 90° 5 HSS - - -
RS Stock No. 218-668
BrandRS PRO
$12.78
Each
units
10mm 90° 3 HSS - - -
RS Stock No. 456-898
BrandRS PRO
$37.99
Each
units
12mm - 3 HSS 120 mm - -
RS Stock No. 218-595
BrandRS PRO
$23.54
Each
units
12mm 90° 5 HSS - - -
RS Stock No. 456-905
BrandRS PRO
$76.12
Each
units
25mm 90° 3 HSS 145 mm - -
RS Stock No. 673-8701
BrandRS PRO
$7.22
Each
units
8.3mm 90° 3 HSS 50 mm 6 mm 38mm
RS Stock No. 423-822
BrandRS PRO
$33.14
Each
units
20.5mm 90° 3 HSS 43 mm 7.15 mm 21.5mm
RS Stock No. 215-489
BrandRS PRO
$17.82
Each
units
10mm 90° - HSS 48 mm 8 mm 30.5mm
RS Stock No. 423-826
BrandRS PRO
$23.80
Each
units
16.5mm 90° 3 HSS 40 mm 7.15 mm 21.5mm
RS Stock No. 673-8704
BrandRS PRO
$14.09
Each
units
10.4mm 90° 3 HSS 50 mm 6 mm 36mm
RS Stock No. 218-630
BrandRS PRO
$19.49
Each
units
20mm 90° 3 HSS - - -
RS Stock No. 562-533
BrandRS PRO
$18.54
Each
units
10mm 90° 3 HSS 39 mm 6.35 mm 20.5mm
RS Stock No. 423-832
BrandRS PRO
$17.14
Each
units
10.4mm 90° 5 HSS 31 mm 7.15 mm 21.5mm
RS Stock No. 423-816
BrandRS PRO
$23.65
Each
units
12.4mm 90° 3 HSS 36 mm 7.15 mm 21.5mm
RS Stock No. 423-872
BrandRS PRO
$14.86
Each
units
8.3mm 90° 3 HSS 32 mm 7.15 mm 21.5mm
RS Stock No. 562-634
BrandRS PRO
$11.52
Each
units
6mm 90° 5 HSS 45 mm 5 mm 35mm
RS Stock No. 218-551
BrandRS PRO
$8.81
Each
units
6mm 90° 3 HSS - - -
RS Stock No. 423-810
BrandRS PRO
$20.30
Each
units
10.4mm 90° 3 HSS 34 mm 7.15 mm 21.5mm
RS Stock No. 215-439
BrandRS PRO
$26.72
Each
units
10mm 90° - HSS 48 mm 8 mm 30.5mm
RS Stock No. 423-850
BrandRS PRO
$17.60
Each
units
21mm 90° - HSS 65 mm 7.15 mm 20mm
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