Plastic Corner Connector Hinged Cover Cabinet G-K421

The G-K421 Plastic Corner Connector In Twelve Photographed Positions

Twelve frames were shot for this corner connector and the first one shows the whole idea in one view: four connectors in ivory, walnut brown, black and grey, each with its cover flipped open. Inside every one of them is a round screw boss and a set of slots; outside, a flap that closes over the top. That flap is the reason the connector exists in the form it does, and it is the first thing to look at on any sample.

A corner connector does the hidden work in a cabinet. It joins two panels at a right angle where the joint will never be seen, and it has to do that with one screw rather than the four a flat corner bracket needs. The triangular body of the connector is what makes that possible: the connector sits into the corner, the screw goes down through the boss into the panel below, and the sloping face of the connector takes the load from the second panel. What the flap adds is a clean finish, because the screw that holds the connector is under it.

The frames were shot square at 750 pixels as one set, and the twelve are twelve views rather than re-exports. The six used in the gallery were chosen to show the colour range, the open and closed position of the cover, the screw boss inside the body and the drawing frame that carries the two sizes. The video in the folder was not used at all.

One Connector, Five Colours

The colour range is not decoration on a connector like this one. The connector sits inside a cabinet where a plinth meets a side panel, or where a back panel meets a carcass, and in a white cabinet a white connector disappears while a black one shows as a shadow at the joint. Ivory is there for the older cream faced boards, grey for grey faced chipboard, walnut brown for a wood finish, and black for a black or dark carcass. A buyer who orders one colour for everything will find that colour wrong in half the cabinets on a run.

The two sizes marked on the drawing frame are the ones that decide whether the connector fits. Twenty two millimetres is the width of the base, which is the amount of panel the connector covers; forty millimetres is the height of the standing face, which is how far it reaches up the second panel. Both are small enough to sit inside the corner of a cabinet plinth without being seen, and both are large enough to take the screw boss without splitting the moulding around it.

How The Hinged Cover Works

The second frame is the connector with its cover standing open, and it is the frame to read the construction from. The body is a single moulding: the triangular outer shape, the screw boss inside it, the slots on either side of the boss, and the hinge line at the back edge are all one piece of plastic. The cover is not a separate cap that clips on and falls off in the carton; it is hinged to the body and stays attached through packing, through fitting and through the life of the cabinet.

The boss inside the connector is the part that carries the screw. It is counterbored, which means the head of the screw sinks into it rather than standing proud, and that is what lets the cover close flat over the top. The slots either side of the boss are there so the same connector can take a screw that is slightly off centre, which happens on a cabinet where the pilot hole was drilled by hand. A connector with a single tight hole and no slots is far less forgiving on site, and it is the difference between a joint that goes together first time and one that has to be redrilled.

The cover closes with a snap. The tab on the free edge of the flap presses into the connector body and holds, so the cover does not lift when the cabinet is used. That matters more than it sounds: a loose cover over a screw in a plinth is the first thing to rattle in a kitchen, and a cover that is moulded to the same body cannot be fitted out of line. When the cover is shut, the connector reads as a plain triangular block with the connector body underneath with no fixing visible at all.

Specifying A Connector Order

Four properties settle a connector order and each of them belongs to the connector rather than to the cabinet. The first is the connector colour, because the connector is chosen to disappear against the carcass and a connector in the wrong colour is a connector that has to be swapped. The second is the connector size, 22 mm by 40 mm, because the connector has to fit inside the corner that is left after the plinth is cut. The third is the connector boss, which is counterbored so the screw head sinks and the cover closes flat; a connector without that counterbore is a connector with a lid that stands proud. The fourth is the connector cover, because a cover hinged to the body is a cover that stays with the connector through packing and fitting, while a separate cap is a part that can be lost before the job starts.

Give those four and the connector is specified. Leave the connector colour out and the connector arrives in a colour that shows at every joint on the run; leave the connector boss out and the connector arrives with a screw head standing under the cover. The connector carton follows the same rule: the connector is counted by piece, the connector colour is marked on the carton, and the connector screws are packed with the connector rather than quoted separately, so the connector arrives ready to fit.

Where A Corner Connector Is Used

The commonest place for a connector of this shape is the plinth of a kitchen or a wardrobe, where a toe kick panel meets the side of a carcass from the inside. The connector goes in the corner, one screw down through the boss into the plinth, and the second panel is held by the standing face. Nobody sees it, but without it the plinth relies on a bracket that has to be fixed from the outside, and that fixing shows.

The same connector is used where a back panel meets a side panel on a cabinet with a thin back, where a wardrobe end panel meets a shelf, and where two panels of a modular storage unit are joined at the bottom corner. It is also used in shop fitting, where a display plinth has to go together quickly and come apart again without showing fixings, and in flat pack furniture as the concealed joint at the base of a unit where a cam fitting would show through the bottom.

It is worth being clear about the limits. This is a connector for light joints: plinths, back panels, end panels and the bottom corners of cabinets. It is not a structural corner for a load bearing shelf, and it is not a hinge, even though the cover is hinged. It is also not a replacement for a cam and dowel joint in a carcass that carries weight; where a cabinet has to hold a loaded shelf, the corner wants a bracket with more than one screw in it.

How Many Connectors A Cabinet Takes

A connector count is worth agreeing before an order, because a cabinet that needs four connectors and receives two is a cabinet with a loose plinth. A base unit takes two connectors at the plinth, one at each end of the toe kick panel. A tall unit takes four: two at the plinth and two where the back panel meets the sides. A wardrobe end panel takes one connector at the bottom corner and one under the shelf that braces it. A modular storage unit takes a connector at every corner of every box, which is why those units are sold with a connector count in the instructions rather than a weight rating.

The rule behind those numbers is simple: one connector per corner where a panel meets another panel and only one of the two can be reached with a screw. If both panels can be screwed, a connector is not the right part and a bracket is. If neither can be reached without taking the cabinet apart, the connector has to go in before assembly, which is why the plinth connectors on a flat pack unit are fitted while the unit is still on its side.

Telling A Corner Connector From A Corner Bracket

These two fittings sit in the same corner of the same cabinet and they are not the same part, so it is worth knowing which one a job needs before a carton is opened. A corner bracket is a flat L with a steel plate and four screw holes; it is fixed across the joint and it takes load in two directions. A corner connector is a solid triangular body with a single screw boss; it is fixed down into one panel and it holds the second panel by its shape rather than by screws through it.

That difference decides the job. Where both panels can be reached and screwed, a corner bracket is the stronger answer and it is the cheaper one. Where only one panel can be reached, which is the case inside a plinth or against a back panel, a corner connector is the only one of the two that can be fitted at all. And where the joint has to look clean afterwards, the connector wins because the cover hides the single screw, while a bracket leaves four screw heads showing unless it carries its own cover piece.

In the hand the test takes a second. A connector has one hole and a lid; a bracket has four holes and, on this range, a steel plate underneath. A connector stands up as a block with a sloping back; a bracket folds flat. If a buyer is holding a part with a hinge line in the plastic and one screw boss inside, it is a corner connector, and it belongs at a plinth or a back panel rather than across a shelf corner.

The Names This Connector Sells Under

A fitting of this kind is bought under several names and the three used on this page are the ones with real search behind them. It is a plastic corner connector, because that is the plain description of what it does and the phrase a buyer types when a cabinet corner has to be pulled together. It is a cabinet corner connector, because the cabinet is where nearly all of them end up, at a plinth, a back panel or an end panel. It is a furniture corner connector, because the same part is used on wardrobes, modular storage, shop fittings and flat pack units where the word cabinet would be wrong.

What it is not called matters too, because the names overlap. It is not a corner bracket, which is the flat L with four holes described on this page. It is not a cam and dowel connector, which pulls two panels together from inside a drilled hole. It is not a corner protector, which is a bumper. And it is not a shelf support, although it may sit beside one; a support sets a shelf height and this connector closes a corner. Each of those is a different part, and the frames on this page show which one is being sold.

The cover is the detail buyers describe rather than name: a connector with a hinged lid, a concealed corner connector, a connector with a snap cover. Those descriptions all point at the same moulding, and the frames show the lid in both positions so an enquiry can be matched against a picture rather than against a name.

Questions A Buyer Asks About This Connector

The questions below are the ones that come back most often on a corner connector with a cover, and each answer points at a frame or a part of the moulding.

• What size is it? 22 mm across the base and 40 mm up the standing face, as marked on the drawing frame.
• What is it made of? One moulded plastic body, including the hinge and the cover.
• How many screws does it take? One, through the counterbored boss; the frames show the hole, not a screw count in the pack.
• Is the cover separate? No, it is hinged to the body, so it cannot be lost and it cannot be fitted out of line.
• Does the cover sit flat? Yes, because the screw head sinks into the counterbored boss first.
• What colours are there? Black, walnut brown, white, grey and ivory across the frames.
• Where does it go? Inside a corner at a plinth, a back panel or an end panel, where only one panel can be reached with a screw.
• Will it hold a loaded shelf? No, it is a light joint connector; a shelf that carries weight wants a bracket with more screws.
• Can it be used on flat pack furniture? Yes, at the bottom corners where a cam fitting would show through.
• What is the load rating? Not stated in this batch; ask for the drawing and the figure comes with the quotation.

Checks Before A Connector Goes In

A connector is a small part in a place nobody inspects, so the checks below are the ones that decide whether the corner stays tight. Each is a check on this connector rather than on the cabinet.

• Corner checked for square before the connector goes in, since the body holds an angle rather than pulling one square.
• Panel thickness checked against the screw length, so the screw does not break through the outside face.
• Boss offered over the pilot hole, so the screw starts straight rather than cross threaded in plastic.
• Screw driven until the head beds in the counterbore, not until it stops turning, because plastic will strip.
• Cover worked open and shut before fitting, so a stiff hinge is found on the bench rather than in a cabinet.
• Colour checked against the carcass in daylight, because ivory and white read the same under a workshop lamp.
• Cover closed only after the second panel is in place, so the joint can still be shifted while it is open.
• Joint re-checked after a week, because a connector that was cross threaded shows up as a plinth that has moved.

Who Supplies This Corner Connector

This plastic corner connector is supplied by Guangzhou Gorgeous Intelligent Technology Co., Ltd., a furniture and architectural hardware business whose range covers hinges, drawer slides, handles, stays, legs, castors, locks, corner brackets and the connecting plates and connectors that go with them. The company works to export orders: quantity, colour, screw specification, packing, carton marking and shipping documents are agreed before production rather than after it, and the specification written on the order is the specification the mould works from. The colour, the body size, the boss and the cover are all part of that specification.

Ordering

Send the model number G-K421 with the number of pieces you need, the colour or colours, the screw specification and the destination port, and confirm the body size and the boss against the drawing at the same time. Samples are available before a production order so a connector can be offered into a real plinth corner and driven home with the screw that will ship with it, which is the fastest way for both sides to agree that the cover snaps down flat and that the boss takes the screw without stripping. The drawing, the packing list and whatever test documentation we hold for G-K421 are issued on request, and delivery and payment terms are agreed order by order on the proforma rather than assumed from a previous order.