3D Adjustable Concealed Hinge

Each hinge has six adjusting screws, and the method differs by axis. Work with the door closed, and check the gap after each axis.

• Height (±1.5 mm) — loosen the clamp screws slightly, turn the lower height screw, turn the upper height screw in the opposite direction if needed, then re-tighten.
• Depth (±1 mm) — loosen the fixing screws slightly, press the leaf into the correct position, then re-tighten.
• Lateral (±1.5 mm each side) — the clamp screws stay tight. Turn the central shaft with a 4 mm hex key: left moves the leaf toward the hinge, right tightens. 1.5 mm on each side, 3 mm across the two sides; 3 mm is the total, not the travel in one direction.

Four rules that matter more than the numbers. The clamp screws must be loosened before height and depth adjustment, and re-tightened afterwards. Turning against a tightened clamp screw damages the adjusting mechanism. Leaving a clamp screw loose lets the setting drift within weeks — this is the cause of most “your hinge will not stay adjusted” complaints, and it is not a product fault. Never use a power tool on the adjusting screws.

There are three causes, and they should be checked in this order.

• Settling over time — a timber door moves as the building settles. This is normal, and it is what the 3-year warranty covers: the adjustment stays available instead of the door having to be re-hung.
• Installation — the most common cause. Look for a mortise cut off position, shims used to make up a wrong mortise depth instead of to level, fixing screws not fully driven, clamp screws left loose after adjustment, or a leaf that was already warped before it was hung.
• Load mismatch — the leaf is heavier than the rating, or two hinges are carrying a door that needs three. Weigh the leaf with glass and hardware included.

Check in this order: fixing screws tight, clamp screws locked, leaf weight against the rating, then leaf flatness. A door closer that is not matched to the hinge can also pull a door out of line — confirm compatibility before fitting one.

Four ratings: 40, 60, 80 and 120 kg. The figure is per pair — two hinges together, not per hinge. This is the most common misreading, and it is why doors are sometimes specified with a model that is too small.

Weigh the leaf with glass and hardware included. 40 kg suits interior, invisible and folding doors (35 mm leaf, up to 850 mm wide), 60 kg covers folding and invisible doors and medium swing doors (140 × 30 × 25 mm mortise, 35–50 mm leaf), 80 kg solid timber and heavier flush doors, 120 kg oversized, entrance, hotel and commercial doors.

Yes. A concealed hinge is always mortised into both the leaf and the frame — there is no surface-mounted version. Mortise accuracy decides how much adjustment is left for site correction, so a mortise that is too deep uses up travel before the door is even hung.

For the 150 × 25 (40 kg) model: mortise 150 × 25 × 22.5 mm with an R12.5 mm half-round end, locating hole Ø3 mm, hole spacing 121 mm, first hole 6.5 mm from the mortise end, 5 mm wood screws.

Fixing differs by frame material: wooden frame — countersunk screws with small shims; steel frame — a fixing receiver is required; aluminium frame — the frame maker’s receiver is required and is not supplied. Shims are for levelling only, never for making up a wrong mortise depth.

Yes, but the paperwork matters as much as the hinge. We test the hinge to 1.5–2 hours fire resistance on our own test rig, and the in-house test data is available on request. We do not hold third-party fire certification for this range, so we cannot issue a certificate for the hinge on its own — the rating that counts belongs to the complete door assembly and has to be certified by the door manufacturer.

The hinge figure also has to match the door’s own rating rather than replace it, and the mortise must be sealed after fitting — an unsealed mortise leaves an opening through the leaf that is no longer protected.

Use the hydraulic damped version of this hinge. It has a built-in hydraulic damper: as the leaf comes into the last part of its swing it decelerates automatically and settles softly, so the door no longer slams into the frame.

The damping force is adjustable, so closing speed can be tuned to the weight of the leaf. Specify the damped version when ordering.

A 40 kg door takes the 150 × 25 model — HY-3D 40. The size designation is body length × width in millimetres, and it maps directly to the rating: 150 × 25 for 40 kg, 177 × 28 for 80 kg, 246 × 34 for 120 kg.

Use two hinges on a standard door. Weigh the leaf before ordering — a 40 kg leaf on the 40 kg rating leaves no margin, so if the weight sits close to the limit, move up to 80 kg.

Three hinges — top, middle and bottom — on the 120 kg model. Three hinges is not the same as three times the load: the rating applies to the set, and adding a third hinge of a smaller model does not turn a 40 kg hinge into a 120 kg hinge.

Do not mix sizes on one door. Different models have different body sizes and different mortise dimensions, so a mixed set cannot be fitted into one mortise pattern.

Weigh the leaf first — that decides the model — then cut the mortise to that model’s drawing. Measuring the opening does not tell you which hinge you need.

Body sizes: 150 × 25 mm (40 kg), 140 × 30 mm (60 kg), 177 × 28 mm (80 kg), 246 × 34 mm (120 kg).

Selection in six steps: weigh the leaf with hardware; pick the rating; decide two or three hinges; confirm the frame material and whether a receiver is needed; cut the mortise to the model drawing; hang the door, then adjust height, depth and lateral in that order with the clamp screws loosened first.

The assembled hinge is run through 200,000 open-and-close cycles on our own fatigue rig. The rig is in our plant, so a batch can be re-run, or run to a project's own cycle count.

This is in-house testing rather than third-party certification. The test data is available on request, and the same applies to the 1.5–2 hour fire test — the fire rating that counts belongs to the complete door assembly, so in-house data does not make the door rated. If your project requires testing to a named standard, tell us at enquiry stage and we will confirm what can be run.

Trial orders start at 500 pcs per item for the 3D adjustable concealed hinge range, so a model or finish can be sampled and tested before committing to volume. Bulk production starts at 8,000 pcs per item.

Unit price is quoted by quantity tier — the 500-piece trial tier and the 8,000-piece bulk tier sit on different price levels, and intermediate volumes are quoted individually. These terms apply to the 3D range only; other hinge series carry their own MOQ.

Claims are decided by cause rather than by a blanket return window. There are four cases.

• Quality defect confirmed as ours — after we look at your photographs and identify the cause, the affected quantity is refunded or replaced in full, and the freight is on us either way.
• Short shipment — the missing quantity is sent free of charge, freight on us.
• Damage in transit — not covered, because we sell FOB and the ocean leg sits on your side. Claim against the carrier or on your cargo insurance.
• Cancellation, or damage caused by handling after delivery — no return or replacement; the order is treated as closed and a new order is needed.

Photographs are the first step in every claim. We put our reading of the cause in writing before anything is shipped back, so there is no argument later about which of the four cases applied.