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. 456-898
BrandRS PRO
TWD792.00
Each
units
12mm - 3 HSS 120 mm - -
RS Stock No. 456-905
BrandRS PRO
TWD1,547.00
Each
units
25mm 90° 3 HSS 145 mm - -
RS Stock No. 215-495
BrandRS PRO
TWD865.00
Each
units
15mm 90° - HSS 65 mm 10 mm 37.5mm
RS Stock No. 499-384
Mfr. Part No.4405706
BrandEXACT
TWD355.00
Each
units
6.3mm 90° 3 HSS-E 45 mm 5 mm -
RS Stock No. 218-668
BrandRS PRO
TWD590.00
Each
units
10mm 90° 3 HSS - - -
RS Stock No. 499-390
Mfr. Part No.4405710
BrandEXACT
TWD424.00
Each
units
8.3mm 90° 3 HSS-E 50 mm 6 mm -
RS Stock No. 136-3946
Mfr. Part No.G1066.3
BrandDormer
TWD981.00
Each
units
6.3mm 90° 3 HSS 45 mm 5 mm -
RS Stock No. 508-9020
Mfr. Part No.05643
BrandEXACT
TWD341.00
Each
units
10.4mm 90° 3 HSS 34 mm 1/4 in -
RS Stock No. 136-3939
Mfr. Part No.G1076.3
BrandDormer
TWD1,994.00
Each
units
6.3mm 90° 3 HSS-E 50 mm 6.35 mm -
RS Stock No. 215-423
BrandRS PRO
TWD521.00
Each
units
5mm 90° - HSS 45 mm 6 mm 32mm
RS Stock No. 508-8998
Mfr. Part No.05646
BrandEXACT
TWD483.00
Each
units
20.5mm 90° 3 HSS 41 mm 1/4 in -
RS Stock No. 136-3944
Mfr. Part No.G10716.5
BrandDormer
TWD3,402.00
Each
units
16.5mm 90° 3 HSS-E 50 mm 6.35 mm -
RS Stock No. 508-8976
Mfr. Part No.05421
BrandEXACT
TWD314.00
Each
units
10mm 90° - HSS-E 45 mm - -
RS Stock No. 666-7404
Mfr. Part No.G1366.3
BrandDormer
TWD687.00
Each
units
6.3mm 90° 3 HSS 45 mm 5 mm -
RS Stock No. 509-0036
Mfr. Part No.05510
BrandEXACT
TWD237.00
Each
units
8.3mm 90° 3 HSS 50 mm 6 mm -
RS Stock No. 499-396
Mfr. Part No.4405713
BrandEXACT
TWD519.00
Each
units
10.4mm 90° 3 HSS-E 50 mm 6 mm -
RS Stock No. 673-8701
BrandRS PRO
TWD377.00
Each
units
8.3mm 90° 3 HSS 50 mm 6 mm 38mm
RS Stock No. 423-838
BrandRS PRO
TWD564.00
Each
units
15.3mm 90° 5 HSS 32 mm 7.15 mm 21.5mm
RS Stock No. 508-9008
Mfr. Part No.05645
BrandEXACT
TWD399.00
Each
units
16.5mm 90° 3 HSS 40 mm 1/4 in -
RS Stock No. 136-3947
Mfr. Part No.G1068.3
BrandDormer
TWD1,031.00
Each
units
8.3mm 90° 3 HSS 50 mm 6 mm -