Sheet Metal Fabrication

Sheet metal fabrication turns flat metal sheet (0.5–6mm typical, up to 20mm with heavy equipment) into bent, welded, and assembled parts. Laser cutting handles the flat pattern, press brake bends the flanges, welding joins the pieces. The default process for enclosures, brackets, frames, panels, and structural parts where forming is faster and cheaper than machining from solid. For design best practices, see our Sheet Metal DFM Guidelines

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Sheet Metal Fabrication Capabilities

Feature	Description
Maximum Part Size	3000×1500mm (laser cutting)／Custom sizes available
General Tolerances	Metals: ISO 2768-m (bending)／Laser cut parts: ±0.1mm typical
Precision Tolerances	To drawing specifications and GD&T annotations, tighter than ±0.1mm achievable
Material Thickness Range	0.5mm–20mm
Standard Lead Time	5 business days (simple parts as fast as 1 day)
Processes	Laser Cutting, Punching, Press Brake Forming, Welding, Hardware Insertion
Post-Processing	Surface Finishing

Metals
Composite

Type	Material	Service	Process	More Info
Aluminum	5052-H32	Sheet Metal Fabrication	Cutting / Forming	Data Sheet \| Selection Logic
Aluminum	6061-T6	Sheet Metal Fabrication	Cutting / Forming	Data Sheet \| Selection Logic
Stainless Steel	SUS304	Sheet Metal Fabrication	Cutting / Forming	Data Sheet \| Selection Logic
Stainless Steel	SUS430	Sheet Metal Fabrication	Cutting / Forming	Data Sheet \| Selection Logic
Cold-Rolled Steel	SPCC / ASTM A1008 (CS Type B)	Sheet Metal Fabrication	Cutting / Forming	Data Sheet
Galvanized Steel	SGCC / ASTM A653 G90	Sheet Metal Fabrication	Cutting / Forming	Data Sheet
HSLA Steel	HC340 / ASTM A1011 HSLAS 340	Sheet Metal Fabrication	Cutting / Forming	Data Sheet
HSLA Steel	HC420 / HSLAS 420	Sheet Metal Fabrication	Cutting / Forming	Data Sheet
Structural Steel	SAPH440 / ASTM A1011 SS Gr.50	Sheet Metal Fabrication	Cutting / Forming	Data Sheet

(Coming Soon)

Materials Supported

Common Metal Materials

Aluminum sheet metal for fabrication, bending and anodizing

Aluminum sheet is light, bends clean, and takes anodizing well. 5052 is the go-to for enclosures, panels, and brackets, it bends without cracking even at tight radii. 6061 is harder and stronger but splits on sharp bends; use it where the flat features matter more than the formed ones. 7075 is rarely worth it in sheet metal, the strength gain doesn’t justify how poorly it forms.

Stainless steel sheet metal stock, 304 and 316 grades

Stainless steel sheet holds up in wet, corrosive, or food-contact environments where mild steel would rust through. 304 covers most applications: enclosures, brackets, and structural panels. 316 adds molybdenum, which matters in saltwater exposure or chemical handling. Stainless work-hardens fast; bend angles need to account for springback, and tight radii crack more readily than on mild steel.

Carbon steel sheet metal stock for fabrication

Carbon steel (mild steel) is the default for structural sheet metal parts where corrosion isn’t a concern. It bends predictably, welds without fuss, and costs less than stainless or aluminum. Most brackets, frames, and enclosures that will be powder-coated or painted go in mild steel. SPCC and Q235 are the grades that show up most in fabrication.

Brass sheet metal for decorative fabrication panels

Brass sheet machines and forms well, and the surface finish holds up without coating. It shows up in decorative panels, electrical terminal plates, and parts where low friction matters at contact points. Springback on brass bends is moderate, tighter than steel but looser than aluminum.

Copper sheet metal for bus bars and grounding straps

Copper sheet is used where electrical or thermal conductivity is the main requirement, bus bars, heat spreader plates, and grounding straps. It’s soft and forms without cracking, but scratches easily. Leave a protective film on until final assembly.

Material Selection Guidance

Pick the material based on what the part actually needs to do. Mild steel and galvanized steel keep cost down on brackets, enclosures, and structural frames. Stainless 304 or 316 handles wet environments and chemical exposure where mild steel would rust. 5052 bends without cracking on tight radii; 6061 is harder but machines cleaner after forming. Titanium shows up in aerospace brackets or medical hardware, for most sheet metal work it’s overkill.
Lock in the material before finalizing bend radii and finish specs. Weldability and surface treatment interact. Changing material late shifts the whole process.

Sheet metal fabrication material selection guide by application

Tolerances & Precision

Not every bend and hole needs a tolerance callout. Laser-cut holes hold ±0.1mm without extra cost. Bent flanges drift more, if that dimension matters, call it out on the drawing.

General Tolerances	Metals: ISO 2768-m (bending); Laser cut parts: ±0.1mm typical
Precision Tolerances	Can manufacture and inspect to drawing specifications and GD&T annotations, including tolerances tighter than ±0.1mm
Min Material Thickness	0.5mm
Max Material Thickness	Up to 20mm (depending on material and process)
Min Hole Diameter	Equal to material thickness (min 1mm)
Maximum Part Size	3000×1500 mm (laser cutting); custom sizes available
Minimum Bend Radius	0.5× material thickness
Production Volume	Prototyping: 1-100 pcs Low volume: 101-10,000 pcs High volume: Above 10,001 pcs
Lead Time	5 business days for most projects. Delivery of simple parts can be as fast as 1 day.

Surface Finishing Options

Powder coated steel sheet metal enclosure finish

Powder Coating

Most common finish on steel and aluminum sheet metal parts. Dry powder applied electrostatically, then cured at 180–200°C for 20 minutes. Builds 60–100μm thickness, covers full RAL color range, matte to high-gloss options. Standard outdoor finish for enclosures, frames, and structural panels resists UV, chips, and corrosion.

Anodizing

Aluminum sheet metal only. Type II builds 5–25μm color layer for decoration plus basic corrosion resistance, black, clear, red, blue, gold available. Type III hard anodize builds 25–75μm wear-resistant layer, stays gray or black.
Mask threaded holes and PEM nuts before anodizing; coating buildup affects thread fit.

Zinc plated carbon steel sheet metal finish

Zinc Plating

Standard corrosion protection on carbon steel sheet metal at lower cost than powder coating. Builds 5–15μm thickness, adds minimal weight and doesn’t affect tight dimensions. Yellow chromate seal extends salt-spray resistance to 96–240 hours. Used for internal brackets, fasteners, and frames going into light-corrosion environments.

Brushed Finish

Abrasive belt drawn across the surface in one direction. Creates linear grain pattern on stainless steel and aluminum panels at Ra 0.4–0.8μm. Grit 120–240 produces #4 architectural finish, standard on kitchen appliances, elevator panels, and stainless enclosures. Holds up without coating; fingerprints wipe off with stainless cleaner.

Design Guidelines

A part can be perfectly foldable on paper and still come back with cracked bends, misaligned holes, or a cost three times the estimate. Good design for sheet metal means the flat pattern nests cleanly, the bends don’t fight the material grain, and the holes land where a punch or laser can actually hit them.

Core DFM Principles	Better sheet metal design means: – bend radius matched to material thickness – hole diameter larger than material thickness – consistent bend direction where possible – relief cuts at corners to prevent tearing – tolerances called out only on features that actually matter
Bend Radius	Minimum inside bend radius is typically 1× material thickness for mild steel and stainless, 1.5× for aluminum. Going tighter risks cracking the outer face, especially on 6061. Larger radius costs nothing extra and reduces scrap.
Hole Size and Placement	Small holes and deep holes are common machining cost drivers. The design guidance Hole diameter should be at least equal to material thickness. Smaller punches deflect and break under press load. Edge distance from hole to nearest bend should be at least 2× material thickness, smaller punches deflect and break. Keep holes at least 2× material thickness from any bend line. Holes too close to a bend distort when the flange forms.
Bend Relief	Add bend relief cuts at corners where two bends meet. Without relief, the metal tears or warps at the intersection. Relief width should match material thickness; depth should clear the bend zone.
Flange Length	Minimum flange length is around 4× material thickness. Shorter flanges can’t be gripped by the press brake die and produce inconsistent angles.
Avoid Unnecessary Precision	Sheet metal formed parts hold ±0.1mm on laser-cut features and roughly ±0.5° on bend angles under standard tooling. Calling tighter tolerances on bent flanges drives up inspection time and scrap rate without improving function in most assemblies. Mark only the dimensions that actually affect fit or function.

Typical Applications

CNC machining concept model with engineering drawings

Concept Models

A CNC machined concept model helps teams review part geometry against engineering drawings. Use it during prototype development to check form, accessible features, and design changes before production.

CNC machining functional aluminum housing prototypes

Functional Prototypes

CNC prototyping produces functional aluminum housing parts for checking mounting features and component interfaces. Prototype manufacturing in the intended material helps engineers identify changes before a production run.

Engineering Validation

Dimensional inspection compares CNC machined features with the drawing. These measurements support design verification of critical dimensions before assembly or further production.

CNC machining fit testing with aluminum part and pin

Fit & Assembly Testing

Fit testing checks how a mating pin enters a machined bore. A trial mechanical assembly can reveal alignment, insertion, or clearance issues before parts are ordered in larger quantities.

CNC machining product samples for market testing

Market Testing Samples

Small batches of near-final CNC machined product samples give customers physical parts for product evaluation, fit checks, and feedback before broader product testing or launch decisions.

CNC machining low volume manufacturing of aluminum components

Bridge Production

Low volume manufacturing keeps CNC machined parts available while production plans and bridge tooling are finalized. Repeatable small batches help teams move from prototype to production.

Equipment & Capacity

Sheet metal fabrication runs through several operations, from a flat blank to a finished assembly. Laser cutting shapes the blank; punching adds repeated features; press brake forming makes the bends. Welding, hardware insertion, and finishing follow where the drawing calls for them. The sequence is reviewed around material thickness, part geometry, and assembly requirements.

Laser Cutting

Sheet metal laser cutting produces flat profiles, slots, and hole patterns. Our listed cutting envelope is 3000 × 1500 mm, with material thickness up to 20 mm subject to alloy and process review. A ±0.1 mm target applies to suitable flat features; tighter or sensitive dimensions need drawing review.

Punching

Sheet metal punching makes repeated holes and cutouts in flat blanks. CNC turret tooling can form features such as louvers and knockouts where the tool and material permit. Tool access, hole spacing, and batch size decide whether punching fits the job.

Press Brake Forming

CNC press brake bending forms flanges, channels, brackets, and enclosures. Bend radius, material thickness, and flange length must suit the tooling. Holes close to bend lines need special attention because forming can pull them out of shape.

Welding

Sheet metal welding joins cut and formed parts into assemblies. MIG and TIG processes are selected around the metal, thickness, and joint design. Weld sequence and fixturing matter on thin panels, where heat can pull an otherwise accurate part out of alignment.

Hardware Insertion

PEM nuts, studs, and self-clinching fasteners add threaded attachment points to sheet metal parts. Installation requires the correct hole size and sheet hardness for the specified fastener. Hardware close to an edge or bend needs a clearance check before the blank is cut.

Surface Finishing

Sheet metal finishing includes powder coating, aluminum anodizing, zinc plating, and brushed surfaces. Coating build-up can change a hole or mating fit. Specify the finish and any masked areas on the drawing before the parts move to coating.

Quality Control Flow

View our ISO 9001:2015 Certificate → CNC machining quality control using CMM inspection equipment

Incoming Inspection

Incoming quality control starts with the purchase order and material certificate. We check the specified alloy, temper, stock dimensions and material identification before machining. Any mismatch needs review before the material is released to production.

In-Process Inspection

First article inspection checks the initial part against the drawing before a production run continues. In process inspection then focuses on critical dimensions, workholding and changes that could affect part consistency. Tool wear or a setup change may call for another check.

CMM inspection equipment and technician checking precision component

Final Inspection

Finished parts are checked against the drawing for specified dimensions, hole locations and mating features. CMM inspection and suitable hand gauges support dimensional checks. Inspectors also look for burrs, damaged edges and surface defects before release.

CNC machining material traceability documents with finished metal part

Documentation and Traceability

Material certificates, job records and inspection results connect the finished part to its production lot. This supports material traceability when dimensions or material identity need to be checked later. Request a first article inspection report with your RFQ if the project requires one.

Sheet Metal Fabrication: Common Questions

What sheet metal thicknesses can you fabricate?

Most enclosures, brackets, and panels use sheet from 0.5 to 6 mm thick. Cutting thicker stock, up to 20 mm, requires a separate check of the alloy, part size, and process. Bending capacity also depends on the flange length and tooling. Send the specified grade and thickness with your drawing.

What files are needed for a custom sheet metal fabrication quote?

Send a STEP model for formed geometry or a DXF file for a flat pattern, along with a PDF drawing. The drawing should identify material, thickness, quantity, bends, threaded hardware, finish, and any dimensions that control assembly fit. An assembly drawing is needed for a multi-part weldment.

What tolerances can you hold for precision sheet metal fabrication?

Our published baseline is ±0.1 mm for suitable flat laser-cut features and ±1° for bend angles. Dimensions measured across bends need a separate review because springback and multiple forming operations add variation. Mark the hole positions, flange dimensions, and datums that must meet tighter limits.

Can sheet metal laser cutting and press brake bending be combined?

Yes. Laser cutting produces the blank, and a press brake forms the specified flanges. Holes and slots near a bend can distort as the metal stretches. Include bend radii and relief details in the model so the cutting pattern and forming sequence can be checked together.

Can you make sheet metal prototypes with no minimum order?

Orders can start at one part. Sheet metal prototyping uses cutting and forming for designs that do not need dedicated stamping dies. Quote the prototype quantity and the planned production quantity together to see how setup and finishing costs affect the unit price.

Can you produce welded sheet metal assemblies?

Yes. Sheet metal assembly work includes TIG or MIG welding where the joint and material permit it. Provide the assembly drawing, weld symbols, joint sizes, and dimensions to inspect after welding. Mounting faces or holes needing post-weld machining should be identified before quoting.

Can you install PEM nuts and other self-clinching fasteners?

Yes. We install compatible PEM nuts, studs, and standoffs in sheet metal parts. The fastener part number, sheet hardness, thickness, hole size, and distance from a bend all affect installation. Put the hardware specification on the drawing so those conditions can be reviewed.

What sheet metal finishing options are available?

Sheet metal finishing options include powder coating, aluminum anodizing, zinc plating, and brushed surfaces. Match the finish to the base metal and exposure conditions. State the coating or color requirement on the drawing and mark holes, threads, or mating surfaces where added coating thickness affects fit.