2-in-1 diamond core drill bit and countersink, 45/65 mm, M14

Diamond drill bit – 2-in-1 countersink, 45/65 mm, M14, item no. 50863

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2-in-1 diamond core drill bit with countersink, 45/65 mm, M14 shank

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articlenumber: 50863

EUR 32,50 Excl. VAT *

EUR 38,68 VAT included *

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Description

Additional Informations

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Diamond Core Drill Bit & Countersink 2-in-1 for Washbasin Drain Hole

The diamond core drill bit with integrated countersink creates the drain opening and conical valve seat in the washbasin in a single operation. The core bit cuts the 45 mm pass-through opening for the drain fitting, while the upper milling cone simultaneously cuts the 65 mm wide countersink in which the drain valve sits. The second work step usually required with a separate countersinking tool is eliminated – as is changing tools on the pre-drilled basin.

Why the fixed connection between core bit and cone matters

In a two-step process, the countersink must be aligned precisely with the existing hole. Any deviation leads to an off-center or non-circular valve seat, preventing the drain fitting's seal from seating evenly. On a washbasin, this is not just an aesthetic issue: an uneven seat is the most common cause of leaks that are only noticed after installation – when the basin is already mounted and access is tight. Because the core bit and milling cone are fixed together here, the countersink is automatically created perfectly concentric to the opening.

One placement instead of two – less risk to the basin

Every additional tool placement on a washbasin carries risk. The material is brittle, the wall thickness is thin, and a breakout at the drain opening usually means the total loss of the basin – resulting in significant follow-up costs for custom fabrications or natural stone. Creating the countersink in one pass with the drill hole means placing the tool only once and working through with consistent guidance. This not only reduces processing time, but above all minimizes the number of moments where something can go wrong.

M14 thread for standard power tools

The tool features an M14 thread and can be mounted directly onto angle grinders or stone drilling machines with an M14 thread. An adapter is not required. For a clean result, a drilling guide or template is recommended when starting the cut so the core bit does not wander on the smooth, often curved basin surface.

Technical Specifications at a Glance

Item number: 50863
Design: Diamond core drill bit with integrated countersink, 2-in-1
Drilling diameter: 45 mm
Countersink diameter: 65 mm
Mount: M14
Application: Drain drilling and valve seat in washbasins

Are the hole and countersink created at the same time?

Yes, the core drill bit and milling cone work in a single operation.

The core drill bit cuts the 45 mm opening, while the cone simultaneously mills the 65 mm wide countersink for the drain valve. A second pass with a separate countersinking tool is not necessary.

Does the hole fit standard drain fittings?

The 45 mm pass-through and 65 mm countersink match the common dimensions for washbasins.

Before drilling, the intended drain fitting should still be checked against these dimensions, as special designs may vary.

Which machines fit this core drill bit?

The M14 thread fits directly onto angle grinders and stone drilling machines with an M14 thread.

An adapter is not necessary. When starting the cut on the smooth basin surface, a drilling guide or template is recommended to prevent the tool from wandering.

Does the valve seat require rework?

With clean tool guidance, the drain fitting sits evenly without rework.

Because the cone is fixed directly to the core bit, the countersink is formed concentrically to the opening. Misalignment, which can occur when applying a separate countersink, is structurally impossible.

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