ITAFIX · Turin, Italy

KLEIN FIX — fixing in the slab without adhesive

A self-locking stainless steel threaded insert pressed into a hole drilled with a standard bit. For marble, granite, engineered stone, sintered stone, ceramics, HPL and solid surface — from 7 mm slab thickness. No adhesives or resins, no curing time, full strength right after installation.

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StoneZone is the exclusive distributor of ITAFIX and KLEIN FIX in Poland

KLEIN FIX stainless steel inserts — KLEIN FIX inserts made of 300-series austenitic stainless steel.

Why KLEIN FIX

Drill, press in and done

KLEIN FIX is an insert with serrated crowns that locks mechanically in the hole. It needs no adhesive or chemicals, so the element can be fitted right away — in the workshop or on site — and the joint does not weaken over time.

Fast installationA hole made with a standard Ø12 mm diamond bit, the insert pressed in with one move.
Nothing sticks outThe insert sits inside the slab — nothing protrudes behind it.
Very high strengthUp to approx. 590 kg pull-out force in laboratory tests.
No stress in the slabAt rest the insert does not load the stone; under tension the forces act perpendicular to the hole.
No adhesives or resinsNo curing time, no spending on chemicals, and a clean installation.
Cheaper transportWorktops travel flat, with no glued-on parts — more worktops per container.

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Applications

Worktops, furniture, bathrooms, façades

KLEIN FIX works wherever something has to be screwed securely to a thin slab — and where installation speed, moisture resistance and appearance matter.

Undermount sink fixed under the worktop with KLEIN FIX

Kitchen worktops

Undermount sinks, brackets and fittings mounted directly in the worktop. Shorter production time, less packaging, more worktops per container.

Interior stone cladding fixed with the KLEIN FIX system

Furniture and bathrooms

Invisible fixing with no protruding parts — washbasins, vanity tops, furniture and interior cladding installed quickly and securely.

Ventilated granite façade fixed with KLEIN FIX

Ventilated façades

Stone and ceramic panels fixed from the back, without adhesive. Any panel can be removed anywhere on the façade.

Mounting

Three steps, standard tools

No special drill bits or machines are needed. The hole is drilled with a standard bit on a pillar drill, and the insert is pressed in by hand or with a setting punch.

1. DrillingØ12 mm diamond bit suited to the material, pillar drill with speed control, cooling with a water jet.
2. CheckThe GO/NO GO gauge confirms the hole diameter. The depth must not be less than the “h” value in the table.
3. Press-inThe insert is pressed into the hole — the crowns lock it mechanically. Then you insert the screw and tighten the nut.

Good practice

Bit wear — maximum 2 mm of radius; a worn bit makes a badly shaped hole.
The bracket must be flat and rest against the metal insert.
Sealing — a sealant is recommended to close the hole hermetically.
Do not install if the hole goes right through the slab or is shallower than “h”.

Products

KLEIN FIX inserts — selection by slab thickness

All inserts are 12 mm in diameter. You choose the thread (M4–M8) and the version for the slab thickness. Strength values are averages from laboratory tests — a test on your material is worthwhile.

KLEIN FIX inserts without head (flush with the surface)

Standard

KLEIN FIX without head

Flush with the surface · thread M4, M5, M6, M8

The most popular version: the insert sits entirely inside the slab. The more crowns, the higher the strength and the thicker the slab required.

Code	Thread	Min. slab thickness	Crowns	Hole depth	Pull-out (average)
KF04/08/1N · KF05/08/1N · KF06/08/1N	M4 · M5 · M6	8 mm	1	5.5 mm	110 kg
KF04/10/2N · KF05/10/2N · KF06/10/2N	M4 · M5 · M6	10 mm	2	6.5 mm	210 kg
KF04/12/4N · KF05/12/4N · KF06/12/4N	M4 · M5 · M6	12 mm	4	8.5 mm	410 kg
KF06/18/4N	M6	18 mm	4	13.5 mm	490 kg
KFS06X15/12/4N · KFS08X20/12/4N	M6 · M8 (male)	12 mm	4	8.5 mm	410 kg
KFS06X15/18/4N · KFS08X20/18/4N	M6 · M8 (male)	18 mm	4	13.5 mm	490 kg

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For thinner slabs

KLEIN FIX with head

Head Ø20 mm · thread M4, M5, M6 · from 7 mm thickness

A flanged version for thinner slabs — the head spreads the load over a larger area.

Code	Thread	Min. slab thickness	Crowns	Hole depth	Pull-out (average)
KF04/07/1Y · KF05/07/1Y · KF06/07/1Y	M4 · M5 · M6	7 mm	1	4.5 mm	80 kg
KF04/09/2Y · KF05/09/2Y · KF06/09/2Y	M4 · M5 · M6	9 mm	2	5.5 mm	160 kg
KF04/11/4Y · KF05/11/4Y · KF06/11/4Y	M4 · M5 · M6	11 mm	4	8.5 mm	350 kg

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Patent pending

KLEIN FIX SC

Self Control — checks the hole before installation

A version with a plastic ring that checks the hole by itself: if it goes in, the hole is too large and the insert must not be fitted. Watertight — keeps water out of the hole. Fully compatible with the traditional KLEIN FIX.

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Compact

MINI KLEIN FIX

Ø8 mm · M4 · from 8 mm thickness

A smaller insert for tight spots and hard-to-reach corners. MKF04/08/1N — pull-out approx. 60 kg, MKF04/08/2N — approx. 80 kg.

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Kit

Kit Sink

Complete set for undermount sink installation

C- or Z-shaped bracket, washer, wing nut and — depending on the system — a screw. For KLEIN FIX or BIG BASE.

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No drilling

BIG BASE

Bonded bases — no slab machining

When you don't want to drill: a threaded base is glued to the slab and, once cured, the sink or another element is mounted. Good for hard and valuable materials such as sintered stone and engineered stone.

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Tools

Drill bit with depth stop

FKF11.8.GM

For thin slabs: limits the hole depth and prevents drilling through. In thicker slabs a standard bit is enough.

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Tools

Gauge and setting punch

GO-NOGO.PM · IMPU-KF-M6.P1

The GO/NO GO gauge quickly confirms the hole diameter, and the setting punch presses the insert flush with the surface, without tilting or damage.

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Laboratory tests

Pull-out force in different materials

Average force needed to pull the insert out of the slab. Values come from laboratory tests and are not repeatable 1:1 — before a project we recommend a test on the specific material. We can run that test together with you.

Granite 10 mm95 kgKF06/08/1N

Sintered ceramic 10 mm147 kgKF06/10/2N

Solid surface 9 mm214 kgKF06/10/2N

Compact laminate 10 mm215 kgKF06/10/2N

Travertine 20 mm222 kgKF06/12/4N

Sintered stone 20 mm (DEKTON)243 kgKF06/10/2N

HPL 8 mm245 kgKF06/10/2N

Solid surface 10 mm261 kgKF06/10/2N

Engineered stone 15 mm335 kgKF06/12/4N

Marble 20 mm398 kgKF06/12/4N

Solid surface 12 mm467 kgKF06/12/4N

Granite 20 mm475 kgKF06/12/4N

HPL 12 mm553 kgKF06/12/4N

HPL 10 mm591 kgKF06/12/4N

Projects

Ventilated façades on KLEIN FIX

The system has worked for years on stone, ceramic and HPL façades. Any panel can be removed anywhere on the façade.

Sainte-Trinité church in Geneva — granite façade

Sainte-Trinité Geneva

Church · pink granite

Bodio Center Milan

Office building · HPL laminate

Lamborghini Bologna

Headquarters · ceramics

PTT building in Neuchâtel — granite façade

PTT Neuchâtel

Swiss Post · granite

Indra building in Lugano — Sardinian granite façade

Indra Lugano

Residential building · Sardinian granite

Diagram of a façade panel fixed with KLEIN FIX

How it works

Slab · KLEIN FIX · screw · washer · nut · bracket

FAQ

Frequently asked questions about KLEIN FIX

How do you fix an undermount sink to a stone or sintered stone worktop without adhesive?

Drill holes with a Ø12 mm diamond bit, press in KLEIN FIX inserts and screw the sink on with a Kit Sink (bracket, washer, wing nut). The installation is ready immediately — no waiting for adhesive to cure.

Which materials is KLEIN FIX suitable for?

Marble, granite, quartz engineered stone, sintered stone, ceramics, cotto, HPL laminates and solid surface — from 7 mm slab thickness (version with head) and from 8 mm (version without head).

Which drill bit should be used for the KLEIN FIX hole?

A standard Ø12 mm diamond bit suited to the material, on a pillar drill with speed control and water cooling. For thin slabs there is the FKF11.8.GM bit with a depth stop.

What load can a KLEIN FIX insert take?

Depending on the version and the material, on average from approx. 80 kg to approx. 590 kg pull-out force in laboratory tests. We recommend a test on the specific material — we can run it together with you.

Is KLEIN FIX suitable for ventilated façades?

Yes — the system was created precisely for ventilated stone façades and has worked for years on buildings in Switzerland and Italy. It allows any panel to be removed anywhere on the façade.

Where can I buy KLEIN FIX in Poland?

StoneZone is the exclusive distributor of ITAFIX and KLEIN FIX in Poland. We will select the insert for the material and slab thickness and bring samples for a test.

Manufacturer

The original since 1988

KLEIN FIX is the original system patented by Tiziano Klein. It was first used in 1988 on the Swiss Post building with a ventilated natural stone façade. The system allowed any panel to be removed anywhere on the façade — and it is still chosen for new projects today.

ITAFIX of Turin was born from the cooperation between the inventor and a practitioner with over 20 years of experience in fixing systems. It focuses on continuous development, project-specific solutions and high-quality materials. KLEIN FIX is listed in the Italian standard UNI 11018.

Tiziano Klein — inventor of the KLEIN FIX system

Headquarters: Turin, Italy
System: since 1988, inventor Tiziano Klein
Insert material: 300-series austenitic stainless steel
Standard: listed in UNI 11018
In Poland: StoneZone — exclusive distributor

What do you want to fix, and in which slab?

Tell us the material, the thickness and what needs to be screwed on. We will select the insert and the drill bit, and bring samples for a test at your workshop.

Ask about KLEIN FIX or call: +48 780 123 418