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. 136-3940
Mfr. Part No.G1078.3
BrandDormer
MYR314.40
Each
units
8.3mm 90° 3 HSS-E 50 mm 6.35 mm -
RS Stock No. 666-7426
Mfr. Part No.G13620.5
BrandDormer
MYR200.58
Each
units
20.5mm 90° 3 HSS 63 mm 10 mm -
RS Stock No. 136-3944
Mfr. Part No.G10716.5
BrandDormer
MYR510.21
Each
units
16.5mm 90° 3 HSS-E 50 mm 6.35 mm -
RS Stock No. 812-6028
Mfr. Part No.G57010.4
BrandDormer
MYR227.31
Each
units
10.4mm 90° 3 HSS 50 mm 6 mm -
RS Stock No. 136-3941
Mfr. Part No.G10710.4
BrandDormer
MYR360.26
Each
units
10.4mm 90° 3 HSS-E 50 mm 6.35 mm -
RS Stock No. 812-6034
Mfr. Part No.G57020.5
BrandDormer
MYR389.58
Each
units
20.5mm 90° 3 HSS 63 mm 10 mm -
RS Stock No. 666-7416
Mfr. Part No.G13610.0
BrandDormer
MYR111.42
Each
units
10mm 90° 3 HSS 50 mm 6 mm -
RS Stock No. 666-7422
Mfr. Part No.G13616.5
BrandDormer
MYR155.32
Each
units
16.5mm 90° 3 HSS 60 mm 10 mm -
RS Stock No. 812-6021
Mfr. Part No.G5706.3
BrandDormer
MYR188.39
Each
units
6.3mm 90° 3 HSS 45 mm 5 mm -
RS Stock No. 666-7413
Mfr. Part No.G1368.0
BrandDormer
MYR102.97
Each
units
8mm 90° 3 HSS 50 mm 6 mm -
RS Stock No. 812-6030
Mfr. Part No.G57016.5
BrandDormer
MYR321.67
Each
units
16.5mm 90° 3 HSS 60 mm 10 mm -
RS Stock No. 136-3948
Mfr. Part No.G10610.4
BrandDormer
MYR167.02
Each
units
10.4mm 90° 3 HSS 50 mm 6 mm -
RS Stock No. 136-3945
Mfr. Part No.G10720.5
BrandDormer
MYR692.20
Each
units
20.5mm 90° 3 HSS-E 50 mm 6.35 mm -
RS Stock No. 136-3951
Mfr. Part No.G10620.5
BrandDormer
MYR321.38
Each
units
20.5mm 90° 3 HSS 63 mm 10 mm -
RS Stock No. 136-3950
Mfr. Part No.G10616.5
BrandDormer
MYR236.77
Each
units
16.5mm 90° 3 HSS 60 mm 10 mm -
RS Stock No. 136-3943
Mfr. Part No.G10712.4
BrandDormer
MYR406.26
Each
units
12.4mm 90° 3 HSS-E 50 mm 6.35 mm -
RS Stock No. 812-6024
Mfr. Part No.G5708.3
BrandDormer
MYR211.97
Each
units
8.3mm 90° 3 HSS 50 mm 6 mm -
RS Stock No. 666-7429
Mfr. Part No.G13612.4
BrandDormer
MYR119.50
Each
units
12.4mm 90° 3 HSS 56 mm 8 mm -
RS Stock No. 666-7410
Mfr. Part No.G13610.4
BrandDormer
MYR115.28
Each
units
10.4mm 90° 3 HSS 50 mm 6 mm -
RS Stock No. 136-3939
Mfr. Part No.G1076.3
BrandDormer
MYR298.95
Each
units
6.3mm 90° 3 HSS-E 50 mm 6.35 mm -