Square Tail Hydraulic Cup Hinge Soft Close Clip On F850LH

F850LH Clip-On Cup Hinge With A Squared Alloy Tail, Hydraulic Soft Close, Self Detaching

F850LH is a concealed cabinet hinge for frameless doors: a steel cup that is bored into the door, an arm that carries the linkage and the damper, and a separate base plate that is screwed to the carcass. The arm locates onto that plate from above and holds there by its own clip, so the door can be taken off and hung back without touching a single screw. What gives this model its name is the tail. The end of the arm is a solid, squared alloy section rather than an open fork, and the photographs of the hinge standing on its side show that closed block end clearly while the rear view shows the damper channel opening on the underside of the arm.

Closing is hydraulic. A damper works inside the arm, so the last part of the swing is taken over by the piston instead of by the door hitting the carcass. The hinge is supplied assembled, with the base plate already clipped in position, and the two oblong slots in the plate are what the fitter uses to line the door up before they are tightened.

How The Clip-On Coupling Works

The base plate is a cross shaped wing with an oblong slot through each side, and a reception at its centre that the arm end clips into. Fitting goes the other way round from a fixed hinge: the plate is set and adjusted on the carcass first, the hinge is bored and screwed into the door second, and the two are then simply pushed together until the clip takes. To remove the door, the weight is carried off the hinge and the arm is worked off the plate at the tail end. Nothing is unscrewed and the plate stays exactly where it was set, which is the whole point of a self detaching hinge on joinery that will be maintained later.

The two-piece photograph in this listing exists for that reason. It shows the hinge body and the plate as separate parts, so a buyer can see the plate outline, count the two fixing slots and check the reception before the hinge is ever bored into a door. A workshop that pre-fixes plates to carcasses on the bench and hangs doors later on site can run the two operations as separate stages with a clip-on hinge, which is how most contract joinery is built.

What You See In These Photographs

• The assembled hinge seen three-quarter, with the cup bore facing the camera, the arm and its two adjustment screws, and the plate clipped underneath.
• The rear and underside of the arm, where the linkage, the coil spring and the damper are visible between the cup flange and the plate.
• The hinge body and the base plate lying separately, with the two oblong slots of the plate facing up.
• The hinge standing end-on, showing the plate spanning the carcass with one oblong slot on each side of the arm.
• The hinge lying on its side with the mechanism up, showing the alloy tail at one end and the cup flange at the other.
• The arm in pure side profile, showing the height of the arm, the closed squared tail and the cup flange plate.

The base folder of this model also carried a second export of every one of these photographs, and a weighing of one hinge on a bench scale. Neither was published as a separate image: the duplicate export shows the identical camera position with nothing new to see, and a scale reading belongs on a packing list rather than in a specification. What you are shown is six different views of the hinge, not the same view six times.

Technical Reference For This Hinge

We publish figures for a hinge only where they are on our drawing. For F850LH the geometric set - cup boring diameter and depth, the fixing centres on the cup flange and on the base plate, the overlay and the opening angle - is issued on request against your door drawing, because the same arm is supplied with different plate and overlay variants and we would rather confirm the combination than quote a number from a neighbouring model. What can be stated from the product itself is set out below.

Cycle life, load rating and salt-spray figures are test results rather than catalogue lines. If an order needs them we run the test on the batch or on a sample and the report travels with the shipment, which is a different claim from printing a number here and hoping nobody checks it.

Fitting This Hinge

Bore the door for the cup, set the hinge in the boring and drive the two round countersunk screws into the flange. Fix the base plate to the carcass with the two oblong slots loose, hang the door by pushing the arm onto the plate until the clip takes, then move the door in and out and side to side inside the slots until the gaps are even and tighten. The final fine adjustment is made on the arm screw, which moves the door against the carcass without disturbing the plate.

The two mistakes that put this kind of hinge under load it was not designed for are the same on any concealed hinge. The first is boring too shallow, which leaves the cup proud of the surface and puts the whole door weight through the flange edge; the photographs of the cup show a normal full depth bore and the drawing carries the depth. The second is driving the plate screws into a weak or crumbled hole, because the plate is the part that carries the door and it holds by the board, not by the plating. Where a door is heavy or the board is soft, add a hinge rather than trusting the existing one.

How Many Hinges A Door Needs

Hinge count follows door height and door mass rather than preference. A tall wardrobe door that is hung on two hinges will lift its upper fixing out of the board long before the hinge arm itself fails, and a clip-on coupling does not change that arithmetic. Where a door is over roughly the height at which a standard two hinge layout stops feeling solid in the hand, put a third hinge at mid height and accept the extra fitting; on a light wall-unit door two is usually enough. The mass per hinge that your layout implies is the figure we work from when a buyer sends a door drawing, and we would rather have that conversation before production than after a container arrives.

What We Check Before A Hinge Order Leaves

Every hinge batch is sampled on four points before packing. Function: the hinge is worked through its full swing by hand, so an arm that binds, a pivot tight out of press, or a damper that kicks back instead of closing the last few degrees is caught on the bench. Coupling: the arm is clipped onto its plate and lifted off repeatedly, because clip force is what a fitter notices first and what varies most between press batches. Assembly: the spring, the damper and the pivot pins are confirmed present on the sample. Finish: the plated surface is checked against the approved sample for colour and for coverage inside the cup bore, where an incomplete rinse leaves a mark that only shows up later in service.

The batch is photographed before packing and those photographs are kept against the order. Where a buyer needs a hinge tested rather than inspected - a cycle count on a sample, a pull test on the cup fixing, a salt spray on the plating - that is arranged and costed before the order starts, so the test appears on the proforma instead of appearing later as a dispute.

Where This Hinge Belongs, And Where It Does Not

A clip-on hydraulic hinge with a closed alloy tail is the right hinge for interior joinery whose doors will have to come off during the life of the furniture: kitchen wall units that get cleaned and re-hung, wardrobe and closet carcasses fitted around pipes and boxes, office and hotel joinery looked after by a facilities team rather than the original installer, and retail fixtures that are struck and rebuilt between sites. The closed tail suits those jobs as well as an open one does, since a solid end section does not collect board dust and swarf the way an open fork does, and the damper stays enclosed for longer.

It is the wrong hinge for a marine locker, a hosing-down area, a food processing room or an unventilated outside cabinet in a coastal position. The plating on this class of hinge is a decorative interior finish, not a marine barrier, and salt spray and chlorine attack the pinholes a bright finish always has rather than the sound plating around them. For a wash-down scullery, a boat or a coastal shower we would move a buyer onto a stainless hinge even though it costs more per fitting, because a hinge that corrodes through in a season costs more than the hinge did.

Who Makes This Hinge

This hinge is produced for Guangzhou Gorgeous Intelligent Technology Co., Ltd., a furniture and architectural hardware supplier whose range covers hinges, drawer slides, handles, stays, legs, castors, locks and the fitting sets that go with them. The company works to export orders: carton quantities, marking, barcodes and the documents a buyer needs at their own customs are agreed before production rather than after it, and the hinge specification on the proforma is the specification that is made.

Common Hinge Faults And What They Actually Mean

A door that drops over time is almost always a fixing problem rather than a hinge problem. The hinge is the strongest part of that joint; the board it is screwed into is not. In chipboard and MDF the holding power depends on the pilot hole and the screw gauge, and a base plate that has been screwed and unscrewed repeatedly during fitting loses grip - which shows up as the plate pulling out of the carcass while the hinge arm is still sound. A clip-on hinge reduces how often that happens, because the door comes off at the coupling instead of at the screws, but it does not make the board immune.

A soft close hinge that stops damping has usually been worked past its duty: either the door is heavier than the hinge was specified for, or the door has been pulled to by hand against the damper. The damper in a hinge arm is a hydraulic restriction, not a brake, and repeated manual overrunning is what empties it. A hinge that has lost clip force, so the door lifts off the plate too easily, is normally a plate that was fitted twisted, so the arm meets the edge of the reception instead of the reception itself - slacken the plate, seat it flat and the coupling should come back to firm hand pressure.

Questions Buyers Ask About This Hinge

What does the square tail name mean on this hinge?

The tail of the arm - the end away from the cup - is finished as a solid squared alloy section closed over at the end, rather than an open fork with the internal parts left exposed at the tip. The side profile photograph shows the closed end; the rear photograph shows the damper channel opening on the underside of the arm.

Is it a soft close hinge?

Yes - hydraulic, with the damper inside the arm. The rear view in this listing shows the spring, the linkage and the damper in place, so the damping is something you can see rather than a word on a page.

How is the door removed?

Carry the weight of the door off the hinge and work the arm off the plate at the tail end. The plate stays exactly where it was set on the carcass and no screw is undone.

How many holes does the assembled hinge use?

Two round countersunk holes in the cup flange on the door side, and one oblong slot through each side of the cross wing plate on the carcass side. The end-on photograph shows both slots at once.

Can the plate be adjusted after fitting?

Within the slots, yes. The door is moved in and out and side to side while the plate screws are loose, and the arm screw then takes up the final gap adjustment.

Are screws included?

Not as standard. Screw gauge and length depend on the door and carcass panel, and we would rather the buyer specify the fixing for the board than accept ours and find the holding power short.

Is the weighing photograph part of the specification?

No, and it is not published on this page. A scale reading is one hinge off one batch at one moment; the figure that governs a shipment is the measured weight on the packing list for that batch.

Can you supply other variants of this hinge?

The cup boring and the coupling are shared across the family, so different overlay plates, different tail forms and non-damped versions of the same arm can usually be arranged. Send the door drawing and we will confirm what this hinge can be made to do.

Sign-Off Checklist Before You Order This Hinge

• Door mass and height confirmed against the hinge count, with an added hinge at mid height on tall doors.
• Door material and panel thickness confirmed against the screw holding requirement of the wing plate.
• Cup boring diameter and depth confirmed against the drawing for this hinge, not against a previous hinge.
• Closed square tail confirmed as acceptable, since the arm end is capped rather than open.
• Two slot plate fixing pattern confirmed against the carcass and the adjustment range it needs.
• Overlay requirement confirmed, so the correct plate variant of the family is ordered.
• Lift-off release confirmed as acceptable for the end user, since there is no push-button on this hinge.
• Screw specification agreed separately, since fixings are not supplied as standard with this hinge.
• Environment confirmed as dry or moderately humid; wet and hosed areas are outside the duty of this hinge.
• Packing, carton quantity and marking confirmed against the order before the hinge batch starts.

Why Buyers Compare This Hinge Against Three Alternatives

Against a fixed cup hinge the difference on this model is the coupling. A fixed hinge has the arm and the plate captured together, so a door comes off by undoing the plate from the carcass and the setting goes with it. A clip-on hinge lets the door leave at the arm instead, so the plate setting survives every removal. On site that is the difference between a two minute job and a hinge that has to be re-shimmed, re-screwed and re-aligned.

Against a non-damped hinge of the same size the difference is what happens in the last few degrees. A plain hinge swings free until the door meets the carcass and stops there, which is noisy on a wall unit and puts the shock into the fixing rather than into the damper. A hydraulic hinge turns that stop into a controlled closing speed, and on a hinge that is opened dozens of times a day that is the whole reason the specification was written.

Against a surface-mounted screw-on hinge, a bored cup hinge hides the fitting and allows a fuller overlay, but it needs the boring to be made properly. Where a workshop has no boring template the surface hinge is the practical choice; where the joinery is machine made the cup hinge is the better fitting, and on a contract job the extra cost of the hinge is small beside the cost of doors that will not hang true.

Ordering

Send the model number F850LH with the quantity, the destination port and the carton marking you need. Samples are available before a production order so the hinge can be bored, clipped and swung in your own panels, which is the fastest way for both sides to agree the hinge is right for the job. Drawings, the batch weight sheet and whatever test documentation we hold for this hinge model are issued on request, and delivery and payment terms are agreed order by order on the proforma rather than assumed.