Which screw size is this countersink bit designed for?

With a 20.5 mm head diameter, this countersink bit is intended for M10 countersunk screws.

What type of shank does this countersink bit have?

It features a standard 1/4 inch external hexagon shank, compatible with bit holders, drills, and impact drivers.

Can this countersink bit be used with impact drivers?

Yes, the Fein VARIO design is specially built to handle high speeds and the impact action of impact drivers.

Which materials can be worked with this countersink?

It is suitable for unalloyed and alloyed steel up to 900 N/mm², as well as aluminium and brass.

What is the countersink angle of this tool?

This taper countersink has a standard countersink angle of 90°.

FEIN 63901081010 VARIO 90° taper countersink bit 20.5 mm M10

Name: FEIN 63901081010 VARIO 90° taper countersink bit 20.5 mm M10
Brand: FEIN
SKU: 08118082
Price: 57.4 EUR
Availability: InStock

Supplier number: FEIN 63901081010 | EAN 4014586476872

Recommended Retail Price €64.13

57.40 tax incl.

€47.44 excl. VAT (incl. all environmental contributions)

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Precise countersinking for flush fixings

Practical benefits

Engineered for M10 screws: With a 20,5 mm diameter and a 90° angle, you countersink pre-drilled holes smoothly for a flush finish.
Universal hex shank fitting: The 1/4 in hex shank locks securely into standard bit holders, ensuring you change tools quickly without slippage.
Durable high-speed HSS steel: Built from robust HSS material, the cutter retains its edge during demanding metalworking jobs.

In a nutshell

The right choise for

With the Fein Vario countersink bit, you prepare clean and precise holes in steel, aluminium, and brass. Thanks to the 20.5 mm diameter and 90° angle, you countersink M10 fixings completely flush with the surface while removing sharp burrs. The hard-wearing hss steel keeps its cutting edge sharp during demanding assembly and metalworking jobs. Featuring a 1/4 in hex shank, it slots securely into standard bit holders, drills, and impact drivers without slipping, allowing you to switch tools quickly and achieve neat results.

Product information FAQ

€57.40

In stock - tax incl.

Key features according to our expert

Large diameter: 20,5 mm
Shank size: 1/4 inch
Shank type: External hexagon
Countersink angle: 90 °

Product description

VARIO 90° taper countersink bit 20.5 mm (M10)
Long service life, thanks to high material strength (64 HRC), special cutting geometries suitable for impact screwdrivers and a TiAlN (titanium-aluminium-nitride) coating. The accessories are low-wear and low-friction as well as heat-resistant up to 800 °C and can therefore be used with high turning and impact frequencies in steel up to 900 N/mm2. Optimally suitable for the following materials: unalloyed and alloyed steels up to 900 N/mm², aluminium, brass.

All Features

Large diameter: 20,5 mm
Shank size: 1/4 inch
Shank type: External hexagon
Countersink angle: 90 °
ø: 20.5 mm
L: 63 mm
Strength: 64 HRC
Tool holder: VARIO bit shank
Coating: Titanium-aluminium nitride (TiAlN)
Material: HSS
Heat resistance: max. 800°C

Brand FEIN
08118082
EAN 4014586476872
Supplier number FEIN 63901081010

Frequently asked questions about this product

Answered by specialists

Which screw size is this countersink bit designed for?: With a 20.5 mm head diameter, this countersink bit is intended for M10 countersunk screws.
What type of shank does this countersink bit have?: It features a standard 1/4 inch external hexagon shank, compatible with bit holders, drills, and impact drivers.
Can this countersink bit be used with impact drivers?: Yes, the Fein VARIO design is specially built to handle high speeds and the impact action of impact drivers.
Which materials can be worked with this countersink?: It is suitable for unalloyed and alloyed steel up to 900 N/mm², as well as aluminium and brass.
What is the countersink angle of this tool?: This taper countersink has a standard countersink angle of 90°.