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. 215-423
BrandRS PRO
SGD15.89
Each
units
5mm 90° - HSS 45 mm 6 mm 32mm
RS Stock No. 509-0036
Mfr. Part No.05510
BrandEXACT
SGD10.37
Each
units
8.3mm 90° 3 HSS 50 mm 6 mm -
RS Stock No. 508-8976
Mfr. Part No.05421
BrandEXACT
SGD14.03
Each
units
10mm 90° - HSS-E 45 mm - -
RS Stock No. 218-646
BrandRS PRO
SGD24.37
Each
units
16mm 90° 3 HSS - - -
RS Stock No. 215-495
BrandRS PRO
SGD28.12
Each
units
15mm 90° - HSS 65 mm 10 mm 37.5mm
RS Stock No. 666-7410
Mfr. Part No.G13610.4
BrandDormer
SGD36.82
Each
units
10.4mm 90° 3 HSS 50 mm 6 mm -
RS Stock No. 509-0008
Mfr. Part No.05522
BrandEXACT
SGD26.40
Each
units
25mm 90° 3 HSS 67 mm 10 mm -
RS Stock No. 136-3951
Mfr. Part No.G10620.5
BrandDormer
SGD101.98
Each
units
20.5mm 90° 3 HSS 63 mm 10 mm -
RS Stock No. 508-9020
Mfr. Part No.05643
BrandEXACT
SGD12.89
Each
units
10.4mm 90° 3 HSS 34 mm 1/4 in -
RS Stock No. 666-7404
Mfr. Part No.G1366.3
BrandDormer
SGD28.12
Each
units
6.3mm 90° 3 HSS 45 mm 5 mm -
RS Stock No. 499-384
Mfr. Part No.4405706
BrandEXACT
SGD14.67
Each
units
6.3mm 90° 3 HSS-E 45 mm 5 mm -
RS Stock No. 423-816
BrandRS PRO
SGD16.46
Each
units
12.4mm 90° 3 HSS 36 mm 7.15 mm 21.5mm
RS Stock No. 423-876
BrandRS PRO
SGD13.74
Each
units
6.3mm 90° 3 HSS 31 mm 7.15 mm 21.5mm
RS Stock No. 136-3941
Mfr. Part No.G10710.4
BrandDormer
SGD109.65
Each
units
10.4mm 90° 3 HSS-E 50 mm 6.35 mm -
RS Stock No. 499-390
Mfr. Part No.4405710
BrandEXACT
SGD17.60
Each
units
8.3mm 90° 3 HSS-E 50 mm 6 mm -
RS Stock No. 136-3950
Mfr. Part No.G10616.5
BrandDormer
SGD75.14
Each
units
16.5mm 90° 3 HSS 60 mm 10 mm -
RS Stock No. 136-3940
Mfr. Part No.G1078.3
BrandDormer
SGD95.65
Each
units
8.3mm 90° 3 HSS-E 50 mm 6.35 mm -
RS Stock No. 215-439
BrandRS PRO
SGD20.59
Each
units
10mm 90° - HSS 48 mm 8 mm 30.5mm
RS Stock No. 812-6030
Mfr. Part No.G57016.5
BrandDormer
SGD102.43
Each
units
16.5mm 90° 3 HSS 60 mm 10 mm -
RS Stock No. 666-7435
Mfr. Part No.G13625.0
BrandDormer
SGD92.38
Each
units
25mm 90° 3 HSS 67 mm 10 mm -
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