Flat stock, cut and formed into structure
Cut, bent, and joined metal parts for enclosures, brackets, panels, and structural assemblies — across laser, waterjet, plasma, punching, and die-based forming, from a single bracket to a full production run.
What it is
Cut flat, then formed to shape. Sheet metal fabrication starts with a flat pattern cut from stock metal, which is then formed into its final 3D shape and joined if the part has multiple pieces. There is no single "sheet metal process" — the cutting method, the forming method, and whether tooling is involved all change with your material, thickness, and volume. Tooling investment varies depending on the part, and can also be zero — it scales from a single bracket to a few thousand identical panels.
Cutting
The flat pattern, including holes and slots, is cut from the sheet. Laser, waterjet, plasma, punching, or shearing, depending on thickness, edge quality, and quantity.
Forming
The flat pattern becomes 3D. Press-brake bending for most work; roll forming, deep drawing, or stamping where geometry or volume calls for it.
Joining & finishing
Multi-piece assemblies are welded, riveted, or fitted with self-clinching hardware, then deburred, plated, or coated.
Cutting the flat pattern
Different cutting methods suit different jobs. Most suppliers run one or two, so this often determines which supplier fits your part.
Forming it to shape — and the volume fork
Forming is where sheet metal splits into two very different economic models.
No-tooling forming — Press-brake bending, roll forming, and manual work. No upfront tooling cost, so it's viable from a single unit. This covers most brackets, enclosures, and panels.
Die-based forming — Stamping, progressive dies, and deep drawing. A die is cut for your part, which is a real upfront investment, but per-part cost then drops sharply and cycle times are fast. Deep drawing in particular is how seamless cups, sinks, and one-piece enclosures get made — geometry a press brake simply cannot produce.
The practical rule: below a few thousand units, laser or punch plus press brake almost always wins. Past that, stamping starts paying back its tooling — the same trade-off you face choosing between CNC and injection moulding on the plastics side.
What's possible, within reason
Bend radius has a floor. The minimum inside bend radius is roughly equal to the material thickness — tighter radii risk cracking, especially in harder alloys.
Holes need clearance from bends. Features placed too close to a bend line distort during forming. Keep holes and slots at a safe distance from every bend.
One thickness per part, usually. Standard sheet metal parts use a single material gauge throughout — mixing thicknesses in one part typically means joining pieces together.
Heat matters on some materials. Laser and plasma both leave a heat-affected zone. Where hardening or distortion is a concern, waterjet cuts cold.
Complex 3D curvature isn't press-brake work. Brakes fold along straight lines. Smoothly curved or drawn shapes need roll forming, deep drawing, or a different process entirely.
Stamping is a volume commitment. Die cost is sunk before the first part ships, and design changes after the die is cut are expensive. Prove the design with brake-formed parts first.
Welded assemblies add cost, not just parts. Each weld is a manual or semi-manual operation. Fewer, larger flat-pattern pieces are usually cheaper than many small welded ones.
Metals
Cutting
Forming
Joining
Finishes
From flat pattern to finished assembly
Upload & spec. Submit your flat pattern or 3D model, material and gauge, quantity, and any requirement on cut method, edge quality, or heat sensitivity.
Matched & quoted. Kutenga matches you to shops running the right cutting and forming equipment for your part, and you compare quotes side by side.
Confirm your order. Review and confirm specs, price, and lead time before production begins. Die-based work adds a tooling step and sample approval before the main run.
Cut, form, join. Parts are cut, formed, and assembled. Typical lead time starts from 7 business days for straightforward brake-formed parts; stamped parts take longer up front while the die is made.
Inspect & confirm receipt. Check parts against your drawing on arrival and confirm receipt.
Bend radius — Default to an inside radius equal to your material thickness unless you have a specific reason to go tighter.
Hole spacing — Keep holes at least 2–3× the material thickness away from any bend line and from part edges.
Bend relief — Add a small relief cut wherever a bend line intersects an edge or slot to stop tearing during forming.
Consolidate parts — One folded part with a few bends is usually cheaper and stronger than several flat pieces welded together.
Say what actually matters — If edge quality, heat distortion, or burr-free faces are critical, state it on the RFQ rather than specifying a cut method. Suppliers can often meet the requirement more cheaply their own way.
A note on the numbers above: tolerance, thickness, and lead time figures are typical industry reference ranges, not a guarantee from a specific Kutenga supplier. Cutting thickness limits in particular vary widely with machine power, material, and required edge quality — treat the ranges above as indicative only. Actual capability depends on which shop takes your order; Kutenga verifies supplier capability during onboarding but does not perform its own quality control on parts. Confirm tight tolerances, thick sections, or unusual gauges directly on your RFQ.
Ready to get parts fabricated?
Upload your flat pattern or model and get matched with vetted sheet metal shops across Africa and beyond.