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 the 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



  • 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 in the centre.

  • 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 use 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 centring 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


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 Drill Bit Type Head Diameter Countersink Angle Number of Flutes Material Overall Length Number of Pieces Shank Diameter Shank Length
RS Stock No. 499-396
Mfr. Part No.4405713
BrandEXACT
MYR76.44
Each
units
Countersink 10.4mm 90° 3 HSS-E 50 mm 1 6 mm -
RS Stock No. 499-380
Mfr. Part No.4405727
BrandEXACT
MYR454.98
1 Set
Set(s)
Countersink Set 6.3 mm, 8.3 mm, 10.4 mm, 12.4 mm, 16.5 mm, 20.5 mm 90° 3 HSS-E - 6 - -
RS Stock No. 508-8982
Mfr. Part No.05649
BrandEXACT
MYR454.65
1 Set
Set(s)
Countersink Set 20.5mm 90° 3 HSS - 9 - -
RS Stock No. 508-9064
Mfr. Part No.05520
BrandEXACT
MYR76.64
Each
units
Countersink 20.5mm 90° 3 HSS 63 mm 1 10 mm -
RS Stock No. 508-9799
Mfr. Part No.05515
BrandEXACT
MYR45.76
Each
units
Countersink 12.4mm 90° 3 HSS 56 mm 1 8 mm -
RS Stock No. 508-9058
Mfr. Part No.05527
BrandEXACT
MYR361.20
1 Set
Set(s)
Countersink Set 6.3 mm, 8.3 mm, 10.4 mm, 12.4 mm, 16.5 mm, 20.5 mm 90° 3 HSS - 6 - -
RS Stock No. 508-9070
Mfr. Part No.05518
BrandEXACT
MYR54.56
Each
units
Countersink 16.5mm 90° 3 HSS 60 mm 1 10 mm -
RS Stock No. 499-403
Mfr. Part No.4405718
BrandEXACT
MYR96.73
Each
units
Countersink 16.5mm 90° 3 HSS-E 60 mm 1 10 mm -
RS Stock No. 509-0008
Mfr. Part No.05522
BrandEXACT
MYR96.05
Each
units
Countersink 25mm 90° 3 HSS 67 mm 1 10 mm -
RS Stock No. 499-407
Mfr. Part No.4405715
BrandEXACT
MYR79.11
Each
units
Countersink 12.4mm 90° 3 HSS-E 56 mm 1 8 mm -
RS Stock No. 499-390
Mfr. Part No.4405710
BrandEXACT
MYR62.75
Each
units
Countersink 8.3mm 90° 3 HSS-E 50 mm 1 6 mm -
RS Stock No. 508-8954
Mfr. Part No.05423
BrandEXACT
MYR91.12
Each
units
Countersink 21mm 90° - HSS-E 65 mm 1 - -
RS Stock No. 508-9092
Mfr. Part No.05644
BrandEXACT
MYR58.90
Each
units
Countersink 12.4mm 90° 3 HSS 35 mm 1 1/4 in -
RS Stock No. 508-9020
Mfr. Part No.05643
BrandEXACT
MYR52.96
Each
units
Countersink 10.4mm 90° 3 HSS 34 mm 1 1/4 in -
RS Stock No. 508-9042
Mfr. Part No.05641
BrandEXACT
MYR44.09
Each
units
Countersink 6.3mm 90° 3 HSS 31 mm 1 1/4 in -
RS Stock No. 508-8819
Mfr. Part No.05506
BrandEXACT
MYR32.35
Each
units
Countersink 6.3mm 90° 3 HSS 45 mm 1 5 mm -
RS Stock No. 509-0036
Mfr. Part No.05510
BrandEXACT
MYR35.15
Each
units
Countersink 8.3mm 90° 3 HSS 50 mm 1 6 mm -
RS Stock No. 499-413
Mfr. Part No.4405720
BrandEXACT
MYR137.94
Each
units
Countersink 20.5mm 90° 3 HSS-E 63 mm 1 10 mm -
RS Stock No. 508-8976
Mfr. Part No.05421
BrandEXACT
MYR46.29
Each
units
Countersink 10mm 90° - HSS-E 45 mm 1 - -
RS Stock No. 509-0014
Mfr. Part No.05513
BrandEXACT
MYR42.76
Each
units
Countersink 10.4mm 90° 3 HSS 50 mm 1 6 mm -