Tight dimensional accuracy
We hold tolerances as tight as ±0.05 mm batch after batch. It’s not just about what one part measures in the lab; it’s about all 50,000 parts staying inside that window across a production run. Stable tooling, temperature-controlled stamping speeds, and CMM validation on every production lot make that happen.
Complete in-house manufacturing
Tooling design, stamping, laser cutting, welding, CNC machining, and assembly all happen under our roof. There’s no finger-pointing when something goes wrong, and quality stays consistent because one team owns the entire press.
Wide range of copper alloys
C110, C102, brass, phosphor bronze—we stock and stamp the full range. Each alloy behaves differently, and we match the process to the metal. Need high conductivity? Corrosion resistance? Spring properties? We’ll steer you toward the right material, even if it means talking you out of a more expensive option.
From prototype to high-volume production
Single-digit prototypes, pilot runs, and full-scale progressive die production all flow through the same engineering team. Our presses go up to 315 tons, so heavy-gauge copper isn’t a problem.
Capacities of RongHai Copper Stamping
With over 20 years in metal stamping, we treat every copper part as a precision component, not a commodity. Our in-house tooling team, dedicated copper process protocols, and full-range inspection from incoming material to final shipment mean you get consistent quality from prototype to high-volume orders. We support OEM and ODM work, handle copper alloys from 0.1 mm foil to heavy-gauge plate, and integrate laser cutting, CNC machining, welding, and assembly so you’re dealing with one manufacturing partner, not a supply chain.
Specification | Detail |
Manufacturing Methods | OEM and ODM |
MOQ | According to drawing |
Processes | Laser Cutting, Bending, Blanking, Deep Drawing, Spinning, Welding, Assembly |
Metal Sheet Thickness | Customizable (typically 0.1 mm – 6 mm) |
Material | Copper and its alloys (C110, C102, Brass, Phosphor Bronze, etc.) |
Surface Finishes | Powder Coating, Electrophoresis, or custom specified |
Certification | ISO 9001 |
Min. Tolerance | ±0.05 mm |
Machining Center Accuracy | ±0.008 mm |
Additional Services | Technical support, custom packaging, QA documentation, freight solutions, after-sales |
Our Copper Stamping Factory
Let’s be honest upfront: copper is one of the easiest metals to stamp—but it’s also one of the easiest to damage. Burrs, scratches, work hardening, and dimensional distortion show up fast when tooling clearances aren’t right or process control isn’t rigorous. I’ve walked into too many shops where the scrap bin tells the real story, even though the sample parts look perfect.
At RongHai, we don’t pretend copper is just another metal. We handle it with the respect it demands. That means tooling designed specifically for copper’s softness and springback, lubrication protocols that don’t leave residue, and in-process inspections that catch burr growth before it becomes a shipment problem. You get parts that actually look like copper should—clean, burr-free, and dimensionally stable.
Not all copper parts are created equal, and neither are the stamping methods. Here’s how we match the right approach to your part geometry, volume, and budget.
When your volumes climb into the hundreds of thousands, progressive die stamping is the only way to keep unit cost low while holding tight tolerances. A single die set carries the strip through multiple stations—blanking, forming, piercing, coining—until a finished part drops off every press stroke.
Yes, the tooling investment is higher. A progressive die for a complex terminal might run $8,000–$25,000. But once that die is dialed in, your per-part cost can drop by 60–80% compared to stage tooling. For connectors, terminals, busbar segments, and EMI shields, that translates into a payback within the first 50,000 pieces. We’ll only recommend this route if your volumes justify it. If you’re still prototyping, we’ll start with a different method and scale up when you’re ready.
Deep drawing copper is where a lot of shops get into trouble. Copper work-hardens fast, and if you try to draw it in one aggressive hit, it tears. The grains stretch and lock up, and then you’ve got scrap metal and a damaged die.
We control this with drawing ratio discipline, multi-stage draws for deeper shells, and in-process annealing. Our 315-ton hydraulic press gives us long, controlled stroke lengths and dwell time under pressure—something a mechanical press can’t match for deep draws. We also run phosphor bronze and brass deep-drawn parts for electrical housings and sensor bodies. The key is knowing when to anneal between draws and which lubricant film can handle the heat without staining the copper.
When you’re working with 4 mm or 5 mm copper busbar plate, a typical 100-ton press will struggle. The material doesn’t flow easily; it wants to cold-weld itself to the punch face, and shearing requires enormous force. Our 315-ton hydraulic press stamps heavy copper in one pass where others need two or three setups. That means tighter tolerances, fewer handling marks, and parts that come out flat—no secondary straightening needed.
Fine blanking produces edges so clean they look like they’ve been machined. It’s great for components that need high flatness and a smooth cut surface for electrical contact or sealing. However, it requires specialized tooling and higher tonnage presses. We’ll recommend it only when your part’s functional performance depends on that level of edge quality—otherwise, conventional stamping with a well-maintained punch-die clearance will give you 90% of the result at half the cost.
The alloy you choose changes everything: conductivity, formability, cost, corrosion resistance. Here’s a practical breakdown of the common copper materials we work with and when to use them.
This is the workhorse. Excellent electrical conductivity (100% IACS minimum), good formability, and relatively low cost. We stamp more C110 than anything else—busbars, terminals, heat sinks, grounding straps. The main watchout: it contains a small amount of oxygen, so it’s not ideal for high-temperature hydrogen environments or certain brazing processes.
Electronic and vacuum applications love C102 because there’s no oxygen to cause embrittlement during heating. Conductivity matches C110, but the price is typically 15–25% higher. If your part gets welded, brazed, or exposed to high heat, the upgrade is worth it. We often stamp C102 for semiconductor components, RF shields, and high-reliability electrical contacts.
Sometimes clients ask for pure copper when brass would actually serve them better—and cost 30–40% less. Brass gives you better strength and excellent corrosion resistance, plus it machines and forms easily. Electrical conductivity drops to around 25–30% IACS, so it’s not for high-current paths, but for decorative, structural, or moderate-conductivity parts (think plumbing fittings, decorative hardware, musical instrument parts), it’s often the smarter choice.
This is the go-to material for springs, contacts, and any part that sees repeated flexing. The phosphor content gives it high fatigue resistance and a nice balance of strength and conductivity (around 15–20% IACS). Many buyers don’t realize it’s not pure copper until we point it out. It costs more than brass, but if your design relies on spring properties, nothing else works as well. We stamp phosphor bronze for switch contacts, relay springs, and connector wipers.
Material | Conductivity (% IACS) | Formability | Strength | Typical Use |
C110 | 100+ | Good | Moderate | Busbars, terminals, heat sinks |
C102 | 100+ | Good | Moderate | Vacuum/electronic parts, weld assemblies |
Brass (C260) | ∼28 | Very Good | High | Decorative hardware, low-current connectors |
Phosphor Bronze (C510) | ∼15 | Moderate | Very High | Springs, switch contacts, flexing parts |
Busbars, cell interconnects, and heat sinks need high conductivity and flatness. Tolerance stack-up can cause hot spots, so we pay extra attention to thickness consistency and edge quality. Laser-welded copper busbars are a growing part of our production.
Contacts, crimp terminals, and ring lugs require tight dimensional control because even 0.1 mm of springback changes insertion force. Our tools are compensated for copper’s springback based on decades of data, not guesswork.
Solar inverter busbars and wind turbine grounding components often live in harsh outdoor environments. We’ll spec the right surface treatment—tin plating, nickel plating, or passivation—to prevent oxidation without killing conductivity.
RF shielding cans and waveguide components need clean edges (no burrs that could arc) and flatness for good gasket contact. Copper’s natural shielding effectiveness makes it the material of choice.
From decorative copper panels to heat exchanger fins, the mix of form, function, and finish keeps our presses busy. Some jobs need a mirror-like polished surface; others are fine with a matte mill finish.
I’m going to share something most stamping shops won’t put on their website: copper is tricky, and if you don’t manage these five problems, your parts will fail in the field.
Copper is gummy. It extrudes between the punch and die if the clearance isn’t exactly right. A fresh die cuts clean, but after a few thousand hits, edge wear opens the clearance and a tiny burr starts to roll up. Left unchecked, that burr grows until it interferes with mating parts or creates a short circuit risk. Our solution: punch clearance held to 2–4% of material thickness (tighter than the standard 5–8% for steel), regular die maintenance intervals based on part count, and in-process burr height checks with microscopes.
Copper is so soft that even the way it’s stacked and transported can leave scratches. We use dedicated material handling trays, protective films on cosmetic surfaces, and rubber-coated guide rails on progressive die strips. It sounds simple, but you’d be amazed how many shops just dump copper stampings into a bin.
All metals spring back after forming; copper more than most. If the die isn’t designed with springback compensation, your part will open up by half a degree or more. We dial in the bend radius, over-bend angle, and springback allowance based on the specific alloy and temper we’re running—not a generic table. That’s why our prototype samples already represent what production parts will look like.
Every time you bend, draw, or coin copper, it gets harder and more brittle. If the part requires multiple forming operations, we stage them carefully and insert an annealing step when the hardness approaches a critical point. Without this, you risk cracking during a final bend or secondary operation. We’ve learned through painful experience where that limit is for each alloy.
Freshly stamped copper looks beautiful, but it tarnishes quickly in storage, especially in humid conditions. Tarnish interferes with soldering and welding, and nobody wants to receive parts that look old. We apply anti-tarnish coatings, vacuum-seal packaging, or plate immediately after stamping when needed. Shelf life matters more than most buyers think.
Certificates and audit reports are fine, but what actually happens on the shop floor is what protects your order. Here’s our inspection flow—not because it’s unique, but because too many factories skip steps when nobody’s watching.
Every coil and sheet gets checked for thickness, width, and alloy certification before it reaches the press. We’ve rejected material that was out of spec and would have caused a thousand bad parts downstream.
Before a production run, the first stamped piece goes through full dimensional verification on the CMM. We don’t start the run until every critical dimension passes.
Operators pull samples at defined intervals (every 1,000–3,000 parts depending on complexity) and check key dimensions, burr height, and surface finish. Trend charts tell us when a tool is starting to wear before it produces bad parts.
Dimensional reports are generated on our coordinate measuring machine (accuracy 0.002 mm) and vision measurement system. We can share these reports with you in real time.
For parts that get welded or plated, we inspect surface cleanliness, flatness, and test weldability on sample parts.
A last check on a statistically valid sample size before packaging, with all results documented.
We verify packaging method, quantity, and protection so parts arrive looking like they did when they left our floor.
We talk a lot about ±0.05 mm because it’s the number most drawing legends ask for. But let me be clear: holding that tolerance in a lab on one part is easy. Holding it across 200,000 production parts is a different game entirely. Tool wear, temperature swings in the press, variations in material thickness—all of these nibble away at your tolerance budget.
Our 0.05 mm capability is real and repeatable because we control the variables:
Press ram parallelism checked weekly.
Temperature-controlled dies and consistent stroke rates.
Material sourced with tight thickness tolerances (we often specify half-standard commercial tolerances).
In-process feedback loops: if a dimension drifts, we stop and correct before the batch is ruined.
Material Thickness (mm) | Achievable Tolerance (mm) |
0.1 – 0.5 | ±0.03 – 0.05 |
0.5 – 1.5 | ±0.05 – 0.08 |
1.5 – 3.0 | ±0.08 – 0.15 |
3.0 – 6.0 | ±0.15 – 0.30 |
Tighter tolerances may be possible with custom process development; please share your drawing for a feasibility review.
You probably don’t want to manage five different suppliers to get one finished copper assembly. We offer a full chain of in-house secondary operations so your stampings arrive ready to install.
For complex profiles, tube fabrication, or when a blanking die isn’t cost-effective yet. Our fiber laser handles copper sheet up to 8 mm.
When stamped parts need tapped holes, precision edges, or machined sealing surfaces, our CNC centers (accuracy ±0.008 mm) take over. For small connectors, we often stamp the blank and then machine the contact surfaces.
Automated deburring ensures edges are safe and burr-free, critical for electrical parts where a stray burr can cause shorts.
We weld copper using laser and resistance welding methods. Laser welding gives a clean, precise bead for busbar stacks and sensor housings.
Tin, nickel, silver, or electrophoresis coating for conductivity, corrosion protection, or aesthetics.
Assembly and Packaging – From simple riveting to complex sub-assemblies with hardware, we can ship you a complete product. Custom packaging and private labeling are standard.
After two decades in this business, I can tell you what separates a solid stamping partner from a disappointment waiting to happen. Use these as your checklist when evaluating a new supplier.
If they have twenty 60-ton presses but nothing above 150 tons, they can’t handle heavy-gauge copper or large parts. Ask specifically about their largest press and what material thickness it routinely stamps.
Shops that outsource tooling lose the ability to quickly refine the process or troubleshoot. At RongHai, we design and build all stamping dies in-house, which means when you need a tweak, we make it the same day.
A CMM that collects dust isn’t the same as one that’s used every shift. Ask for a sample in-process inspection report. If they hesitate, walk away.
Any honest factory knows its defect rate. If they can’t tell you what percentage of parts were scrapped last month, they aren’t tracking quality. We run at less than 0.8% internal scrap on copper jobs, and we’re proud of that number.
A good factory doesn’t just quote; they suggest ways to improve the design for manufacturability—material swaps, bend relief tweaks, tolerance relaxations that save money without hurting function. If their quote comes back with just a price and no questions, they’re probably not paying attention.
We regularly stamp copper from 0.1 mm foil up to 6 mm plate. Above 6 mm, the process shifts toward fine blanking or machining, but we can handle many thick applications on our 315-ton press.
C110 offers the highest conductivity at the lowest cost. For applications involving high heat or welding, C102 oxygen-free copper is a better choice despite the higher price.
Absolutely. We weld copper using laser and resistance methods. Surface cleanliness is critical; we clean parts immediately before welding to prevent oxidation from affecting weld quality.
If you’re deep drawing or doing multiple severe bends, yes. Copper work-hardens quickly and will crack without intermediate annealing. We plan the process sequence around annealing points to avoid cracking and maintain grain structure.
It’s drawing-dependent. Prototype runs can be as low as a few dozen pieces; production orders typically start at several thousand. We’ll work with you to find the right balance between tooling cost and piece price.
Yes, we use laser cutting, soft tooling, and short-run stamping techniques to deliver fast prototypes—often within 2–3 weeks—before investing in full production tooling.
Simple single-station tools can be ready in 2–3 weeks. Progressive dies for complex parts usually take 4–8 weeks, depending on the number of stations and tolerances.
We hold ±0.05 mm on critical features for materials up to 1.5 mm thick, and wider tolerances for thicker materials as shown in our tolerance table. We always confirm feasibility against your drawing before quoting.
Yes, we can arrange tin, nickel, silver, or electro-phoretic coating through long-term partner facilities, quality-controlled to our standards.
Yes, we provide sub-assembly, custom packaging, barcoding, and drop-shipping services to reduce your handling costs.
We’re not the biggest stamping factory, and we don’t try to be. What we bring is a level of transparency and technical depth that’s hard to find:
A 315-ton press capable of heavy-gauge copper in one hit
In-house tooling design and build, so process refinement happens fast
0.05 mm tolerance controlled across production runs, not just on the first article
Complete in-house chain: laser cutting, CNC machining, welding, assembly
CMM inspection and full documentation with every shipment
24-hour DFM feedback so you know what you’re getting into before you commit
A 20-year track record in metal stamping, with the scars to prove we know what we’re doing
If you’re tired of suppliers who overpromise and underdeliver on copper parts, let’s talk. Send us your drawing—we’ll give you honest feedback and a competitive quote. No smoke. No mirrors. Just good stamping.
[Contact us at sales@rhmould.com or call +86 15265276266]
How Our Factory Supports Reliable Bulk Supply
With a press line that runs from 80 to 315 tons, in-house tooling, laser cutting, welding, and assembly all under one roof, we’re built for volume without losing the thread on quality. Our raw material inventory of copper, brass, steel, and aluminum means we can respond to spikes in demand without waiting for mill deliveries. ERP-controlled production scheduling, kanban-style material flow, and daily output tracking keep your orders on time, run after run. Whether you need 5,000 brackets or 500,000 terminals, our system is set up to absorb the load while keeping every batch inside specification.
How We Ensure Consistent Quality in Every Batch
Quality isn’t a final checkpoint at RongHai—it’s a series of hard stops built into every production run. For copper parts especially, small process drifts cause big problems. Burr growth, surface damage, work hardening, and oxidation don’t announce themselves. We catch them with seven inspection gates that run from material receipt to container loading, so you don’t inherit surprises.
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Other Metal Stamping Parts
Copper isn’t the only metal flowing through our presses. We stamp a wide range of materials for structural, decorative, and functional applications—stainless steel brackets, aluminum heat sinks, galvanized steel housings, brass connectors, and more. These parts power industries from automotive to furniture to renewable energy. The gallery below shows real samples: not catalog models, but production parts we’ve shipped. Each image comes with a brief description so you can identify applications relevant to your own sourcing needs.
Articles of Sheet Metal Stamping Parts
This is where shop-floor experience meets practical advice. Our article library digs into the details that most stamping houses never put in writing: how to spec a progressive die without overpaying, why material grain direction matters for bend reliability, when laser cutting beats blank tooling. Each piece comes from real projects and real mistakes—the kind of knowledge that helps buyers and engineers avoid costly surprises. Whether you’re new to sheet metal stamping or a seasoned sourcing manager, you’ll find useful perspectives drawn from more than two decades on the factory floor.
West side of Guangzhou North Road, Jiaozhou City, Qingdao City, Shandong Province
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