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EXACT HSS-E Drill Bit, 20.5mm Head, 3 Flute(s), 90°, 1 Piece(s)

EXACT HSS-E Drill Bit, 16.5mm Head, 3 Flute(s), 90°, 1 Piece(s)

EXACT HSS-E Drill Bit, 10.4mm Head, 3 Flute(s), 90°, 1 Piece(s)

EXACT HSS-E Countersink Drill Bit Set, 6.3 mm, 8.3 mm, 10.4 mm, 12.4 mm, 16.5 mm, 20.5 mm Head, 3 Flute(s), 90°, 6

EXACT HSS-E Drill Bit, 8.3mm Head, 3 Flute(s), 90°, 1 Piece(s)

EXACT HSS-E Drill Bit, 15mm Head, 90°, 1 Piece(s)

EXACT HSS Countersink Drill Bit Set, 20.5mm Head, 3 Flute(s), 90°, 9 Piece(s)

EXACT HSS-E Drill Bit, 25mm Head, 3 Flute(s), 90°, 1 Piece(s)


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.



Countersinks

Drill Bits & Parts

Power Tools, Soldering & Welding

1228569899

1492797549

1805640584

1872595187

1950438482

2099506070

2911534392

2972144945

3047907070

3089561311

3379516231

3702440375

3893962904

3999174723

4084450865

482906937

573211935

607105215

630592386

1337321341

1713511683

1953764780

215561600

2212326362

245755136

2675376924

2694081498

2854130884

3031041232

3479376779

3537785963

3606191116

3676807775

3694170890

3696367266

3871454867

3980878867

4239710393

730636658

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Raspberry Pi, Arduino, ROCK, STEM Education & Development Tools

Electronic Components, Power & Connectors

Engineering Materials & Industrial Hardware

Pneumatic Counters, Logic Controllers & Timers

Electronics Cleaners & Protective Coatings

RS PRO HSS Countersink Drill Bit Set 3 Flute(s) 6 Piece(s)

BETA 438 Series HSS Thread & Countersink Drill Bit for Metal 3 mm Overall

BETA 438 Series HSS Thread & Countersink Drill Bit for Metal 5 mm Overall

EXACT HSS-E Countersink Drill Bit Set 90°, 4 Piece(s)

EXACT HSS Countersink Drill Bit Set 3 Flute(s) 9 Piece(s)

RS PRO Countersink Drill Bit Set 8.3 mm 12.4 mm 20.5 mm Head, 6 Piece(s)

BETA 438 Series HSS Thread & Countersink Drill Bit for Metal 6 mm Overall

BETA 438 Series HSS Thread & Countersink Drill Bit for Metal 10 mm Overall

EXACT Countersinks

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