Triangular Metal Corner Bracket 30mm Cabinet K423-P42

The K423-P42 Triangular Corner Bracket In Ten Photographed Positions

Ten frames were shot for this metal corner bracket and they cover the part in the order a buyer checks it: the body from the outside, the two faces that carry the screws, the recess between them, and one frame of the drawing with the three figures that define it. A bracket this simple is either right or it is not, and the difference almost never shows in a single photograph, so the frames spend their time on the parts that decide whether the joint stays tight.

The shape is a solid triangle, not a folded plate. Two faces meet at a right angle and a thick web closes the triangle between them, so the bracket is a wedge that fills the inside of the corner rather than a strip bent over the edge. That is what makes this bracket different from a stamped L: a folded plate carries a corner only as long as nothing pushes the corner open, and a solid wedge resists the same load with the material of the whole triangle.

Each face carries one screw hole, so the bracket is fixed once into each panel. Between the two faces there is a shallow recess with a raised rim along its edges, and the screw seats sit inside that recess. That detail is the reason the bracket is comfortable in furniture: the head sits below the rim instead of standing on the surface, so a fitted bracket does not catch on whatever slides past it and the corner looks finished rather than repaired.

The Body, The Recess And The Two Holes

The web is what makes a triangular corner bracket worth buying over a flat angle. On a flat plate the screws hold the plate and the plate holds the corner, and every load passes through the bend. On this bracket the load passes through the triangle, so a shelf that is dragged across the corner pushes into solid material rather than into a fold. The frames show the web from the outside precisely so that a buyer can see how much material sits behind the corner.

The recess works with the rim rather than against it. The rim stiffens the edge of each face, which is where a cast or machined bracket would otherwise be thinnest, and it leaves a sunken seat in the middle for the screw. That combination is why the bracket can be thin at the edge and still stiff: the rim is a rib, and the recess is the room the screw head needs to finish out of the way.

Two holes, one per face, is the minimum that makes sense and it is also the fixing most cabinet work wants. A single screw would let the bracket pivot; four screws would start to split a thin panel. One hole in each face pulls the bracket into the corner and holds it there, and on a metal corner bracket the second panel is held by the body of the bracket rather than by a second fixing on the same face.

The Three Figures On The Drawing

One frame is the drawing and it marks the bracket three times: 30 millimetres along the base, 5 millimetres for the wall at the base, and 10 millimetres across the plan view. Those three figures describe the outside of the bracket and they are the specification to quote. The base is how far the bracket runs along the shelf, the plan figure is how far it stands out from the panel face, and the wall figure is the thickness of material at the corner.

The figure that is not on the drawing is the height of the standing leg, and this listing does not invent one. A buyer who needs that figure should ask for it with the quotation, because it is the number that decides whether the bracket clears a drawer runner or a carcass rail. The three figures that are printed are enough to place the bracket on a panel and enough to check a sample against the drawing when it arrives.

A 30 millimetre base with a 5 millimetre wall is a proportion worth reading twice. It means the bracket is small on the panel and thick at the corner, which is the shape a cabinet corner wants: the footprint stays inside the joint where nobody sees it, and the material sits exactly where the load turns the corner. On a bracket with a long base and a thin wall the opposite happens, and the corner looks supported without being supported.

The Names This Bracket Sells Under

The same part is bought under several names and three of them are used here. It is a metal corner bracket when the material and the part are named together, which is how a distributor orders it against a picture. It is a triangular corner bracket when the solid web is the point, because that is the shape that separates it from a folded plate. And it is a 90 degree corner bracket when the angle is the specification rather than the shape, which is how a fitter describes the job before looking up the part.

All three names point at the same body, the same two holes and the same recess, so a quotation answers whichever one is on the enquiry. What is worth confirming before an order is the screw: the head has to sit inside the recess and the shank has to bite without breaking out through a 5 millimetre wall, so the screw specification belongs on the order rather than in the fitter's hand.

One more name needs care. A flat corner brace and this bracket are sold side by side and photographed alike. The brace is a plate bent at a right angle; this bracket is a solid triangle with a recess. The frames show the web and the rim, which a flat brace does not have, so the two can be told apart from the pictures without a drawing.

Where A Metal Corner Bracket Is Used

The commonest place is a cabinet or wardrobe carcass, where the bracket sits inside the corner and the shelf rests over its base. The second is a drawer box, where four brackets hold the box square and the recess keeps the inside of the drawer free of standing screw heads. The third is a shelf frame or a bed frame, where the joint carries more load than a cabinet corner and a solid body earns its price.

It is also used as a repair part. When a corner has been knocked and the joint has opened, the bracket goes over the damaged area and one screw into each panel pulls the corner back. On a metal corner bracket that repair is usually the last one the corner needs, because the bracket is carrying the load that the failed joint was never able to carry.

The limits are worth stating plainly. The bracket holds a corner, and it holds it at a right angle; it is not sold as a rated load bearing part and nothing on these frames claims a load figure. Where a shelf has to carry real weight the bracket supplements a mechanical joint rather than standing in for one, and the panel material decides as much as the bracket does.

Plain Metal, And Why It Is Left Plain

This bracket is supplied as a plain metal body with a grey finish and nothing added over the screws. That is a deliberate choice on a part of this shape: a cap would hide the rim that stiffens the face, and a coloured coating thick enough to matter would round off the recess that lets the head sit below the surface. What the frames show is the part as it is fitted, with the two seats open.

Because there is no cover, the finish is visible and it has to be even. The frames are shot on white with no shadow behind the bracket so that the face can be judged: no polishing marks across the recess, no burr standing up at a hole, no mismatch between the two faces. Those three faults are what comes back on a metal corner bracket, and all three are visible in these views.

The colour is worth agreeing in writing rather than assuming. Grey metal covers a range from a light matte to a darker plating tone, and two batches that differ slightly read as two different parts once they are fitted side by side on the same carcass. A signed sample is the only way to make a repeat order match the first one, which is why the finish is agreed against a master rather than described.

Short Answers On This Bracket

• Bracket shape: a solid triangular body with a shallow recess between the two faces.
• Bracket size: 30 mm base, 5 mm wall, 10 mm across the plan view.
• Bracket fixing: one screw hole in each face, so one screw per panel.
• Bracket finish: plain metal, grey, no cap or cover.
• Bracket duty: a corner bracket for cabinets, drawers and frames, not a rated load part.
• Bracket screws: quoted separately and agreed on the order.
• Bracket packing: sold by the piece, the hundred or the thousand.

How This Bracket Is Fitted

The bracket is fitted with the two panels offered up and before the corner is finally tightened. The faces are marked, a pilot hole is drilled in each panel, and the screws are driven through the seats in the two faces. Fitted in that order the bracket pulls the corner closed; fitted after the corner has been forced square it usually fights the panels and pushes the joint back out again.

The two screws are driven alternately rather than one after the other. Driving one screw fully first pulls the bracket out of line and the second hole then fights the body, which is how a corner ends up sitting proud on one face. Alternating the screws keeps the bracket square in the corner and is the single most useful thing to tell a new fitter about this part.

On a production line the bracket is driven with a clutch setting matched to the panel, and checked by eye rather than by feel alone. A metal corner bracket shows a proud head at once because the recess is visible around it, and that is an advantage during inspection: a bracket that is not seated cannot be mistaken for one that is.

Questions A Buyer Asks About This Bracket

• What is it made of? A one-piece metal body with a plain grey finish.
• How many screws? Two, one through each face.
• Do the screw heads show? They sit in the recess, below the raised rim.
• What size is it? 30 mm base, 5 mm wall, 10 mm across the plan view.
• How tall is the standing leg? Not dimensioned on the drawing; ask with the quotation.
• Is it stronger than a flat brace? It carries the corner through the solid web, not through a fold.
• Does it come with screws? Screws are quoted separately and agreed on the order.
• Is a cover available? Not for this bracket; the seats are meant to be open.
• Bracket finish: grey metal, agreed against a master sample.
• Bracket sample: one bracket on approval before a production run.
• Bracket carton: the count per bracket is marked on the box.
• Bracket drawing: issued with every bracket quotation.

Checks Before A Bracket Goes Into A Corner

A part this small is easy to fit badly, so these are the checks that decide whether the corner stays tight once the carcass is loaded and moved.

• Corner checked for square before the bracket goes in, because a bracket holds an angle rather than pulling one square.
• Panels offered up dry, so the bracket is seen to sit on both faces without rocking.
• Screw length checked against the 5 mm wall, so the screw bites without breaking out through the face.
• Screws driven until the bracket is drawn down, not until the metal whitens around a hole.
• Recess checked for burr on a sample from every carton, because a raised burr holds the head proud.
• Bracket counted against the pack, since a carcass corner takes one and a drawer box takes four.
• Joint re-checked after a week, because a bracket with two screws shows a loose corner quickly.

Who Supplies This Bracket

This metal corner bracket 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, connecting plates and the fittings that hold panel furniture together. The company works to export orders: quantity, finish, screw specification, packing, carton marking and shipping documents are agreed before production rather than after it. On a bracket whose whole advantage is a solid body and a clean recess, the finish and the recess depth are agreed against a master sample with the model number, which is the only way a second order can be guaranteed to match the first.

Send the model number K423-P42 with the number of pieces, the screw specification, the panel thickness and the destination port, and confirm the 30, 5 and 10 millimetre figures against the drawing at the same time. Samples are available before a production order so a bracket can be screwed into a real carcass corner, which is the fastest way for both sides to agree that the head sits inside the recess and that the finish matches the panel. The drawing, the packing list and whatever test documentation we hold for K423-P42 are issued on request, and delivery and payment terms are agreed order by order on the proforma rather than assumed from a previous order.