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
MaterialsThese 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. 136-3948
Mfr. Part No.G10610.4
BrandDormer
MYR185.43
Each
units
10.4mm 90° 3 HSS 50 mm 6 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. 508-9042
Mfr. Part No.05641
BrandEXACT
MYR44.55
Each
units
6.3mm 90° 3 HSS 31 mm 1/4 in -
RS Stock No. 666-7422
Mfr. Part No.G13616.5
BrandDormer
MYR178.89
Each
units
16.5mm 90° 3 HSS 60 mm 10 mm -
RS Stock No. 508-8819
Mfr. Part No.05506
BrandEXACT
MYR32.69
Each
units
6.3mm 90° 3 HSS 45 mm 5 mm -
RS Stock No. 509-0014
Mfr. Part No.05513
BrandEXACT
MYR43.21
Each
units
10.4mm 90° 3 HSS 50 mm 6 mm -
RS Stock No. 508-8932
Mfr. Part No.05642
BrandEXACT
MYR44.55
Each
units
8.3mm 90° 3 HSS 31 mm 1/4 in -
RS Stock No. 812-6028
Mfr. Part No.G57010.4
BrandDormer
MYR274.53
Each
units
10.4mm 90° 3 HSS 50 mm 6 mm -
RS Stock No. 812-6037
Mfr. Part No.G57012.4
BrandDormer
MYR256.45
Each
units
12.4mm 90° 3 HSS 56 mm 8 mm -
RS Stock No. 666-7404
Mfr. Part No.G1366.3
BrandDormer
MYR107.91
Each
units
6.3mm 90° 3 HSS 45 mm 5 mm -
RS Stock No. 499-384
Mfr. Part No.4405706
BrandEXACT
MYR52.98
Each
units
6.3mm 90° 3 HSS-E 45 mm 5 mm -
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. 508-9092
Mfr. Part No.05644
BrandEXACT
MYR59.52
Each
units
12.4mm 90° 3 HSS 35 mm 1/4 in -
RS Stock No. 666-7416
Mfr. Part No.G13610.0
BrandDormer
MYR133.60
Each
units
10mm 90° 3 HSS 50 mm 6 mm -
RS Stock No. 499-407
Mfr. Part No.4405715
BrandEXACT
MYR82.04
Each
units
12.4mm 90° 3 HSS-E 56 mm 8 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. 136-3939
Mfr. Part No.G1076.3
BrandDormer
MYR298.95
Each
units
6.3mm 90° 3 HSS-E 50 mm 6.35 mm -
RS Stock No. 666-7426
Mfr. Part No.G13620.5
BrandDormer
MYR242.85
Each
units
20.5mm 90° 3 HSS 63 mm 10 mm -
RS Stock No. 666-7435
Mfr. Part No.G13625.0
BrandDormer
MYR351.17
Each
units
25mm 90° 3 HSS 67 mm 10 mm -
RS Stock No. 136-3947
Mfr. Part No.G1068.3
BrandDormer
MYR161.90
Each
units
8.3mm 90° 3 HSS 50 mm 6 mm -
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