Buyers compare wear layers, thickness, and price per square meter, then treat the click profile as a footnote. That is backwards. The lock is the mechanical heart of a floating floor: it decides how fast the floor installs, whether seams stay tight over years of foot traffic, whether planks can be replaced individually, and how many installation complaints reach you after the sale. Two floors with identical specs on paper can behave completely differently if one is milled on well-maintained tooling and the other is not.
A click system is a profile milled directly into the plank's core: a tongue on one edge, a matching groove on the other, on both the long edges and the ends. Planks assemble by angling and rotating - or by dropping the end joint into place - and the geometry itself holds the floor together. No glue, no nails. Because the profile is cut into the core, lock quality is inseparable from core quality and from the condition of the milling cutter that shaped it.
UNILIN is the Belgian licensing company (part of Unilin Technologies) whose UniClick profiles are licensed to flooring mills worldwide. Its long-edge joint assembles by angling, and its profiles are known for strong joint tension and tight seams. Because so many mills run licensed UNILIN tooling, spare parts and profile consistency across production runs are predictable - one reason it became a de facto reference standard in the industry.
Valinge, the Swedish innovation company, is the other major licensor. Its best-known 5G family assembles the long edge by angling and closes the end joint with a vertical drop-lock - you lean the row in and fold the next plank down, which speeds up installation noticeably in large rooms. Older 2G profiles angle both edges. Like UNILIN, Valinge licenses its profiles to mills across every price segment, so both names appear on budget and premium product alike.
For an importer, the practical difference is smaller than the marketing suggests. Both systems produce glueless, floating floors that a trained crew installs quickly; both hold seams if the core is good. What genuinely matters is whether the mill runs licensed, properly maintained tooling - and whether the profile is appropriate for the product's core and thickness. Ask which system a given product uses, in writing, on the specification sheet.
Licensing is also a legal question, not just a quality one. UNILIN and Valinge hold patents on their profiles and collect royalties from licensed mills. In several markets - the United States has seen repeated patent disputes over unlicensed click flooring - importing unlicensed profiles can expose the seller to legal claims. Before you commit volume, ask your supplier for the licensing status of the click profile. A factory that runs licensed tooling will answer without hesitation; evasive answers are a red flag.
Lock quality is checkable on samples in ten minutes. Engage the same two planks three to five times: the joint should lock with consistent force and no visible gap, and the profile should not chip or whiten. Look at the seam under raking light - a dark line that disappears after tapping is normal, a permanent gap is not. Check the end joint especially: drop-lock ends are the most machined part of the plank and the first place worn tooling shows. A profile that chips on sample number three will chip in your customer's living room.
Core and thickness interact with the lock more than buyers expect. A rigid SPC core mills into crisp, dimensionally stable profiles, while HDF locks depend on fiber density - which is why our HDF is specified at 880-920 kg/m³. And thickness alone does not make a stronger lock: profile geometry and core density decide joint strength, not the millimeter figure on the box. Judge the lock by engaging it, not by reading the thickness row of the spec sheet.
At SHUCHAN FLOORING both UNILIN and Valinge click are available depending on the product line, stated line by line on the specification sheet. The profile is milled in-line during profiling, click engagement is part of our AQL 2.5 pre-shipment inspection on every order, and the golden sample we seal for every buyer includes the lock profile - so the joint you approve is the joint that ships. If you test samples from us, do the three-to-five engage test above on the sample pair before you approve.
When you compare quotes, put the click system on the same line as price and wear layer, and ask every supplier the same three questions: which licensed profile, which core density, and can the lock be verified on a golden sample. The answers cost nothing and remove the single most common source of installation complaints. Send us your specification and we will return the full sheet - lock included - with samples for testing.
