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. 423-838
BrandRS PRO
SGD18.88
Each
units
15.3mm 90° 5 HSS 32 mm 7.15 mm 21.5mm
RS Stock No. 218-668
BrandRS PRO
SGD16.60
Each
units
10mm 90° 3 HSS - - -
RS Stock No. 136-3945
Mfr. Part No.G10720.5
BrandDormer
SGD210.68
Each
units
20.5mm 90° 3 HSS-E 50 mm 6.35 mm -
RS Stock No. 673-8704
BrandRS PRO
SGD10.79
Each
units
10.4mm 90° 3 HSS 50 mm 6 mm 36mm
RS Stock No. 508-8960
Mfr. Part No.05422
BrandEXACT
SGD15.41
Each
units
14mm 90° - HSS-E 48 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. 423-832
BrandRS PRO
SGD14.55
Each
units
10.4mm 90° 5 HSS 31 mm 7.15 mm 21.5mm
RS Stock No. 673-8710
BrandRS PRO
SGD22.40
Each
units
20.5mm 90° 3 HSS 63 mm 10 mm 42mm
RS Stock No. 215-445
BrandRS PRO
SGD28.93
Each
units
15mm 90° - HSS 65 mm 10 mm 37.5mm
RS Stock No. 499-396
Mfr. Part No.4405713
BrandEXACT
SGD21.66
Each
units
10.4mm 90° 3 HSS-E 50 mm 6 mm -
RS Stock No. 423-872
BrandRS PRO
SGD14.56
Each
units
8.3mm 90° 3 HSS 32 mm 7.15 mm 21.5mm
RS Stock No. 218-652
BrandRS PRO
SGD20.76
Each
units
12mm 90° 3 HSS - - -
RS Stock No. 423-850
BrandRS PRO
SGD32.71
Each
units
21mm 90° - HSS 65 mm 7.15 mm 20mm
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. 456-905
BrandRS PRO
SGD46.49
Each
units
25mm 90° 3 HSS 145 mm - -
RS Stock No. 218-589
BrandRS PRO
SGD17.89
Each
units
16mm 90° 5 HSS - - -
RS Stock No. 812-6037
Mfr. Part No.G57012.4
BrandDormer
SGD81.66
Each
units
12.4mm 90° 3 HSS 56 mm 8 mm -
RS Stock No. 218-624
BrandRS PRO
SGD34.25
Each
units
25mm 90° 3 HSS - - -
RS Stock No. 508-9008
Mfr. Part No.05645
BrandEXACT
SGD16.72
Each
units
16.5mm 90° 3 HSS 40 mm 1/4 in -
RS Stock No. 499-413
Mfr. Part No.4405720
BrandEXACT
SGD36.07
Each
units
20.5mm 90° 3 HSS-E 63 mm 10 mm -
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