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. 666-7422
Mfr. Part No.G13616.5
BrandDormer
SGD47.08
Each
units
16.5mm 90° 3 HSS 60 mm 10 mm -
RS Stock No. 136-3949
Mfr. Part No.G10612.4
BrandDormer
SGD59.83
Each
units
12.4mm 90° 3 HSS 56 mm 8 mm -
RS Stock No. 136-3939
Mfr. Part No.G1076.3
BrandDormer
SGD91.00
Each
units
6.3mm 90° 3 HSS-E 50 mm 6.35 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. 136-3944
Mfr. Part No.G10716.5
BrandDormer
SGD155.25
Each
units
16.5mm 90° 3 HSS-E 50 mm 6.35 mm -
RS Stock No. 508-8998
Mfr. Part No.05646
BrandEXACT
SGD18.24
Each
units
20.5mm 90° 3 HSS 41 mm 1/4 in -
RS Stock No. 508-8976
Mfr. Part No.05421
BrandEXACT
SGD14.03
Each
units
10mm 90° - HSS-E 45 mm - -
RS Stock No. 499-403
Mfr. Part No.4405718
BrandEXACT
SGD26.28
Each
units
16.5mm 90° 3 HSS-E 60 mm 10 mm -
RS Stock No. 499-368
Mfr. Part No.4405722
BrandEXACT
SGD45.38
Each
units
25mm 90° 3 HSS-E 67 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. 812-6034
Mfr. Part No.G57020.5
BrandDormer
SGD124.18
Each
units
20.5mm 90° 3 HSS 63 mm 10 mm -
RS Stock No. 508-9070
Mfr. Part No.05518
BrandEXACT
SGD15.43
Each
units
16.5mm 90° 3 HSS 60 mm 10 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. 508-8932
Mfr. Part No.05642
BrandEXACT
SGD11.15
Each
units
8.3mm 90° 3 HSS 31 mm 1/4 in -
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. 666-7413
Mfr. Part No.G1368.0
BrandDormer
SGD31.06
Each
units
8mm 90° 3 HSS 50 mm 6 mm -
RS Stock No. 666-7429
Mfr. Part No.G13612.4
BrandDormer
SGD38.05
Each
units
12.4mm 90° 3 HSS 56 mm 8 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. 508-9193
Mfr. Part No.05424
BrandEXACT
SGD55.49
Each
units
28mm 90° - HSS-E 84 mm - -
RS Stock No. 509-0036
Mfr. Part No.05510
BrandEXACT
SGD10.37
Each
units
8.3mm 90° 3 HSS 50 mm 6 mm -
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