Chalco supplies copper aluminum bimetallic washers for transition connections between copper and aluminum conductors. They are suitable for busbars, terminals, and electrical equipment connection points. Round, square, rectangular, and custom shapes are available, with sizes tailored to the inner diameter, outer diameter, total thickness, copper-to-aluminum ratio, hole position, and installation space.
Common sizes include M6, M8, M10, M12, M14, M16, and M20. These copper aluminum bimetallic washers are widely used in transformers, reactors, switchgear, power distribution equipment, busbar systems, and cable terminals. Material certificates, dimensional inspection reports, batch identification, and custom packaging can be provided as required.
Send us your dimensions, drawings, order quantity, and application conditions to receive a suitable specification recommendation and quotation.
What is a copper aluminum bimetallic washer?
A copper aluminum bimetallic washer is a conductive transition component made by bonding copper and aluminum through explosive bonding, roll bonding, or similar processes. The finished washer keeps a copper contact surface on one side and an aluminum contact surface on the other, with a stable bonded interface across the effective contact area.
At the connection point, the copper side contacts the copper busbar or terminal, while the aluminum side contacts the aluminum busbar or terminal. Unlike a standard flat washer mainly used to distribute fastening pressure, a copper aluminum bimetallic washer also provides electrical transition, matched contact surfaces, and separation between dissimilar metals.
The inner diameter, outer diameter, thickness, and effective contact area can be customized to suit the busbar width, terminal design, installation space, and current-carrying requirements.
Common structures of copper aluminum bimetallic washers
Copper aluminum bimetallic washers are mainly available in two structures: a two-layer bonded structure and an aluminum base with copper plating on one side. The two-layer bonded structure is more commonly used.
| Structure type | Structure description | Main features | Key selection points |
| Two-layer bonded structure | A copper layer and an aluminum layer are permanently bonded by explosive bonding, roll bonding, or a similar process, then stamped, punched, or cut into washers. | One side is solid copper and the other is solid aluminum. The bonded interface covers the effective contact area, and both layers form the main body of the washer. | Check the copper and aluminum grades, total thickness, layer ratio, bonding strength, interface continuity, and edge condition. |
| Aluminum base with copper plating on one side | The washer uses aluminum as the base material, with a copper coating applied to one side. | It is lightweight, and the copper layer mainly serves as the contact surface for some copper-to-aluminum connections. | Check the plating thickness, coverage, adhesion, and suitability for humid, outdoor, or corrosive environments. |
Chalco supplies both two-layer copper aluminum bimetallic washers and aluminum washers with copper plating on one side. Sizes can be customized to suit the connection design, contact area, service environment, and budget, including inner diameter, outer diameter, total thickness, copper-to-aluminum ratio, plating thickness, and special shapes.
Copper aluminum bimetallic washer types and shapes available from Chalco
Chalco supplies standard round copper aluminum bimetallic washers and can also customize square, rectangular, and special shapes to match the contact surface, required contact area, mounting hole position, and available installation space.
Round flat washer
Structural Features:Features a central circular hole and a compact design; compatible with standard bolted connections.
Applications:Connections involving copper and aluminum busbars, copper and aluminum terminals, switchgear, and transformers.
Square washer
Structure:Covers a larger flat contact area and fits square terminals or busbar assemblies.
Applications:Large-area busbar connections, terminal bases, and electrical equipment connections.
Rectangular transition washer
Structure:Length and width can be customized to match the contact surface, with single-hole, double-hole, or multi-hole designs available.
Applications:Length and width can be customized to match the contact surface, with single-hole, double-hole, or multi-hole designs available.
Custom-shaped washer
Structure:Made to fit equipment contours, limited installation space, and specific hole positions, including irregular profiles and offset holes.
Applications:Space-limited installations, replacement parts for existing equipment, and custom drawing-based projects.
Common round copper aluminum bimetallic washer sizes available from Chalco
Round copper aluminum bimetallic washers are available for M6 to M20 connections. The M size refers to the nominal bolt diameter. The inner hole includes assembly clearance, while the outer diameter should fully cover the effective conductive contact area of the copper busbar, aluminum busbar, or terminal.
| Connection size | Reference inner diameter d (mm) | Reference outer diameter D (mm) | Common thickness t (mm) | Typical applications |
| M6 | 6.5 | 13.2–15 | 1, 2, or 3 | Small terminals, control cabinets, and auxiliary electrical connections |
| M8 | 8.5 | 17.2–18 | 1, 2, or 3 | Cable terminals, small busbars, and power distribution equipment |
| M10 | 11 | 21.2–22 | 1, 2, or 3 | Busbars, switchgear, and equipment terminals |
| M12 | 13 | 28–28.2 | 1, 2, or 3 | Transformer terminals, medium-size busbars, and power distribution connections |
| M14 | 15 | 28–32 | 1, 2, or 3 | Larger terminals and busbar connection points |
| M16 | 17 | 35 | 1, 2, or 3 | High-current busbars, transformers, and reactor connections |
| M20 | 21 | 40 | 1, 2, or 3 | Large busbars and high-current electrical equipment |
Chalco can also customize the inner diameter, outer diameter, total thickness, and copper-to-aluminum layer ratio based on customer drawings. Small sizes from M3 to M5, large sizes above M20, and non-standard hole diameters are also available.
For high-current or large contact-area connections, selection should not be based on the M size alone. Please also provide the busbar dimensions, terminal contact area, and installation structure.
Custom sizes and tolerance control for copper aluminum bimetallic washers
Non-standard busbars, special terminals, replacement parts for existing equipment, and limited installation space often require custom washer dimensions.
Chalco can manufacture to drawings, with controlled inner diameter, outer profile, thickness, hole position, and copper-to-aluminum layer ratio. Key dimensions affecting assembly accuracy and electrical contact are also carefully controlled.
- Inner hole: Standard round holes, non-standard round holes, slotted holes, and offset holes are available to match bolts, studs, and equipment mounting holes, helping reduce misalignment and on-site rework.
- Outer shape: Round, square, rectangular, notched, and custom profiles can be produced to fit busbar widths, terminal contact areas, and limited installation space.
- Total thickness: Thickness can be customized to match the connection stack height, clamping structure, and drawing requirements, with consistent thickness across each batch.
- Copper and aluminum layer thickness: The copper layer, aluminum layer, and copper-to-aluminum ratio can be adjusted to meet different contact, weight, and cost requirements.
- Hole position and spacing: Single-hole, double-hole, multi-hole, and asymmetric designs are available to match existing busbar, terminal, and equipment structures.
- Flatness: Warping, waviness, and local high spots are controlled to ensure full contact between the copper and aluminum surfaces and the connected conductors.
- Concentricity: The position between the inner hole and outer profile is controlled to prevent washer misalignment and insufficient contact area.
- Burr height: Burrs around the inner hole and outer edge are controlled to reduce conductor scratches, local lifting, and uneven assembly.
- Edge bonding quality: Processed edges are checked for cracking, delamination, or copper-aluminum separation to maintain a complete bonded interface.
- Surface condition: Finished washers can be degreased, cleaned, deburred, and surface-finished to reduce the effect of oil, metal particles, and oxides on electrical contact.
- Processing methods: Standard round washers are usually stamped. Square, rectangular, and complex custom shapes can be produced by stamping, laser cutting, waterjet cutting, or machining, depending on quantity, thickness, and profile.
- Tolerance inspection: Inspection can cover the inner diameter, outer diameter, length, width, hole diameter, hole spacing, total thickness, layer thickness, flatness, concentricity, and burr height. Final tolerances are confirmed based on product size, material thickness, and processing method.
Provide a PDF or DXF drawing, or an original sample, with the key dimensions, tolerances, and copper-to-aluminum contact direction marked. Chalco can help evaluate the most suitable processing method and dimensional control plan.
How does a copper aluminum bimetallic washer create a transition connection?
A copper aluminum bimetallic washer is installed between a copper conductor and an aluminum conductor. The copper side contacts the copper busbar or terminal, while the aluminum side contacts the aluminum busbar or terminal.
Current flows from the copper conductor into the copper layer, passes through the stable copper-aluminum bonded interface, then enters the aluminum layer and continues into the aluminum conductor, forming a continuous electrical path.
| Contact area | How it works | Effect on the connection |
| Copper-side contact surface | The copper layer forms a same-metal contact with the copper conductor. | Prevents direct contact between the copper and aluminum conductors. |
| Copper-aluminum bonded interface | The copper and aluminum layers remain permanently and securely bonded. | Creates a stable conductive transition between the two conductors. |
| Aluminum-side contact surface | The aluminum layer forms a same-metal contact with the aluminum conductor. | Helps reduce oxidation and unstable contact on the aluminum side. |
| Bolted clamping area | The washer fits tightly against both conductors under clamping pressure. | Increases the effective contact area and improves pressure distribution. |
Once installed correctly, the connection changes from direct copper-to-aluminum contact to matched copper-to-copper and aluminum-to-aluminum contact. The continuous bonded layer maintains the conductive path while reducing direct contact between dissimilar metals, providing a more stable transition for busbars, terminals, and electrical equipment.
The washer outer diameter should cover the effective contact area, and the inner hole should match the fastener. Install it with the copper side facing copper and the aluminum side facing aluminum. For humid, outdoor, or corrosive environments, select the washer structure together with suitable terminal surface treatment, joint compound, and sealing protection.
Why can direct copper-to-aluminum connections fail?
Copper and aluminum differ in electrochemical behavior, surface oxidation, and thermal expansion. When they are connected directly, moisture, heat, and repeated load cycles can gradually cause corrosion, oxidation, and unstable electrical contact.
Galvanic corrosion
If water, condensation, or another electrolyte is present at the contact surface, a galvanic couple may form between copper and aluminum. The aluminum side is usually more vulnerable to corrosion, which can lead to pitting, material loss, and reduced connection stability.
Aluminum oxide reduces conductivity
Aluminum quickly forms a dense oxide film on its surface. This layer conducts electricity much less effectively than the aluminum base. As oxidation and contamination increase, the effective contact area decreases and contact resistance rises.
Contact resistance causes local heating
Corrosion, oxidation, or uneven clamping can increase resistance at the connection point. When current passes through, local heating speeds up further oxidation and interface damage, creating a cycle of rising resistance, higher temperature, and continued contact deterioration.
Different thermal expansion affects clamping pressure
Copper and aluminum expand and contract at different rates as temperatures change. Long-term load changes and repeated thermal cycles may reduce contact pressure, loosen bolted joints, or create uneven contact and higher operating temperatures.
Using a copper aluminum bimetallic washer between copper busbars, aluminum busbars, and terminals helps reduce direct contact between the two metals. It can improve corrosion resistance, maintain more stable electrical contact, and support reliable long-term operation.
Copper and aluminum material options for bimetallic washers
The copper and aluminum grades affect electrical conductivity, bonding quality, formability, and long-term reliability. Chalco can match different material purities and tempers based on the equipment, current requirements, drawing standards, and service environment.
| Material layer | Common grades | Main features | Typical applications |
| Copper layer | T2, C11000, Cu-ETP | Stable electrical conductivity with good ductility and bonding performance | Copper busbars, copper terminals, transformers, and power distribution equipment |
| High-purity copper layer | High-purity copper available to project requirements | Higher copper content and tighter impurity control for applications requiring better conductivity and material consistency | High-current busbars, power equipment, and custom electrical connections |
| Aluminum layer | 1060, 1050A, 1070 | High aluminum content with good conductivity, ductility, and bonding performance | Aluminum busbars, aluminum terminals, and standard copper-to-aluminum transition connections |
| Commercially pure aluminum layer | 1100 | Good formability and corrosion resistance for some non-standard connection designs | Custom terminals, special-shaped washers, and general electrical connections |
Copper-to-aluminum layer ratio for bimetallic washers
Chalco mainly supplies copper aluminum bimetallic washers with a 20% copper and 80% aluminum structure. This ratio provides a practical balance between the copper contact layer, aluminum base, product weight, and material cost, making it suitable for standard copper-to-aluminum connections in busbars, terminals, transformers, switchgear, and power distribution equipment.
In addition to the standard 20/80 structure, other copper-to-aluminum ratios can be customized based on drawings, total thickness, contact area, and project requirements.
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20% copper / 80% aluminum
Chalco's recommended structure balances copper-side contact, processability, weight, and cost, making it suitable for standard copper-to-aluminum transition connections.
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15% copper / 85% aluminum
A thinner copper layer and higher aluminum content make this structure suitable for projects focused on lower weight and cost.
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30% copper / 70% aluminum
A thicker copper layer makes this structure suitable for connections that require greater copper thickness or additional machining allowance.
Other custom ratios
For non-standard connection designs, Chalco can customize the copper layer, aluminum layer, and total thickness based on the drawing, without being limited to a fixed ratio. The final layer combination can be selected according to the effective contact area, processing method, installation space, and service environment.
Manufacturing and bonding processes for copper aluminum bimetallic washers
Chalco selects the production process based on the washer structure, copper-to-aluminum ratio, dimensions, and order quantity. Both two-layer bonded washers and aluminum-base washers with copper plating on one side are available.
Raw material preparation
Suitable copper and aluminum materials are selected, then degreased, deoxidized, and cleaned to prepare a clean surface for bonding, copper plating, and forming.
Copper-aluminum bonding
Two-layer washers can be produced by explosive bonding, roll bonding, or a combined process to create a stable copper-aluminum interface. For single-side copper-plated washers, a uniform copper layer is formed on the specified side of the aluminum base.
Sheet finishing
The bonded sheet can be rolled, leveled, or annealed under controlled conditions to achieve the required thickness, flatness, and forming performance.
Washer forming
Round washers are usually stamped and punched. Square, rectangular, and custom shapes can be produced by stamping, laser cutting, waterjet cutting, or machining, depending on size, quantity, and precision requirements.
Deburring and cleaning
Burrs are removed from the inner hole and outer edge, and oil, metal particles, and other contaminants are cleaned from the surface.
Final inspection
Finished washers are checked for inner and outer dimensions, total thickness, copper and aluminum layer thickness, flatness, surface condition, and edge bonding quality to prevent cracking, delamination, or local separation.
Technical performance and quality requirements for copper aluminum bimetallic washers
A stable copper-aluminum bonded interface, reliable electrical contact, and consistent dimensional accuracy are essential for long-term performance. Chalco can control and inspect the following key properties based on drawings and project requirements.
- Bonding strength: The copper and aluminum layers should form a continuous and secure interface without delamination, blistering, or separation during punching, blanking, and clamping.
- Electrical performance: The copper and aluminum layers retain their own conductivity, while the bonded interface provides stable current transfer. Final performance also depends on the layer ratio, contact area, surface condition, and clamping pressure.
- Dimensional consistency: The inner diameter, outer diameter, total thickness, hole spacing, and layer thickness should meet drawing requirements to ensure stable assembly within each batch.
- Flatness and contact surface: The washer should remain flat, without warping, waviness, or local high spots, so both sides maintain full contact with the connected conductors.
- Edge bonding quality: The punched or cut inner and outer edges should be free from visible cracks, delamination, or interface peeling, with burrs properly removed.
- Surface quality: The copper and aluminum surfaces should be clean and free from obvious oil, oxidation spots, scratches, dents, or other defects that may affect electrical contact.
- Batch consistency: Material grades, copper-to-aluminum ratio, processing parameters, and inspection records can be managed by batch for quality traceability and repeat orders.
Applications of copper aluminum bimetallic washers
Copper aluminum bimetallic washers are used in electrical equipment and busbar systems that require a stable transition between copper and aluminum conductors. Different sizes and structures can be selected based on the contact area, mounting hole position, current requirements, and service environment.
Transformers and reactors
Used for transition connections between copper terminals, aluminum terminals, and lead-out busbars, helping reduce the long-term reliability issues caused by direct copper-to-aluminum contact.
Switchgear and power distribution equipment
Installed between copper busbars, aluminum busbars, and equipment terminals, making them suitable for bolted connections in low-voltage distribution cabinets, medium-voltage switchgear, and complete electrical assemblies.
Copper-to-aluminum busbar connections
Used at lap joints between copper and aluminum busbars, with the copper side contacting the copper conductor and the aluminum side contacting the aluminum conductor. Single-hole, double-hole, and multi-hole designs are available.
Grounding and conductive connection systems
Suitable for transition connections between copper grounding bars and aluminum conductors in power distribution equipment, industrial systems, and electrical cabinets.
Outdoor and humid environments
For outdoor, high-humidity, or salt-spray conditions, the washers can be used with tinned terminals, joint compound, and sealing protection. The washer structure and surface treatment should be selected according to the service environment.
Battery and energy storage systems
Suitable for transition connections between copper busbars and aluminum conductive parts. Sizes can be customized to match battery modules, energy storage cabinets, and electrical interface designs.
Requirements for dry, humid, and outdoor environments
The service environment affects corrosion, surface oxidation, and long-term contact stability. The washer structure, terminal surface treatment, and sealing method should be selected based on humidity, salt spray, and contamination levels.
Dry indoor environments
Standard two-layer copper aluminum bimetallic washers are suitable for distribution cabinets, transformers, and indoor busbar systems. Keep the contact surfaces clean and tighten the connection according to the equipment requirements.
High-humidity and condensation environments
For equipment exposed to high humidity, large temperature changes, or condensation, additional moisture protection is recommended. Anti-oxidation joint compound, tinned terminals, or local sealing can be used.
Outdoor equipment
Outdoor switchgear, photovoltaic systems, and open-air power distribution equipment should be protected from rain, dust, and contaminants. After installation, use a waterproof enclosure, seals, or protective coating.
Marine and salt-spray environments
Salt can accelerate corrosion in coastal, marine, and offshore applications. A full two-layer bonded structure is recommended, together with tinned connectors, sealing protection, and regular inspection.
Chemically corrosive environments
Where acid or alkaline vapors, industrial dust, or corrosive media are present, confirm the chemical resistance of the copper layer, aluminum layer, and nearby fasteners. Avoid leaving exposed contact surfaces in long-term contact with corrosive substances.
Environmental limits of single-side copper-plated structures
Aluminum-base washers with copper plating on one side are better suited to controlled dry environments. Before using them in humid, outdoor, or corrosive conditions, confirm the plating thickness, adhesion, and terminal surface treatment. Do not select them under the same conditions as full two-layer bonded washers.
Installation guide for copper aluminum bimetallic washers
Correct installation direction, clean contact surfaces, and proper clamping pressure are essential for reliable conductivity and long-term performance.
Identify the copper and aluminum sides
Check both sides before installation. The copper side should face the copper busbar, copper terminal, or other copper conductor, while the aluminum side should face the aluminum busbar, aluminum terminal, or other aluminum conductor.
Clean the contact surfaces
Remove oil, metal particles, oxides, and other contaminants from the conductors, terminals, and washer. Do not use washers with visible scratches, warping, or delamination.
Align the mounting holes
Place the washer between the copper and aluminum conductors. Make sure the inner hole aligns with the bolt hole and the outer profile covers the effective contact area without exceeding the available installation space.
Ensure full surface contact
Check that the copper side fully contacts the copper conductor and the aluminum side fully contacts the aluminum conductor. Burrs, debris, or local high spots should not lift the washer or reduce the contact area.
Tighten to the specified torque
Use the bolt grade, washer combination, and torque specified for the equipment or connection system. Torque requirements vary by bolt size, conductor thickness, and joint design, so a single torque value should not be used for all connections.
Add environmental protection
For humid, outdoor, salt-spray, or corrosive environments, use suitable anti-oxidation joint compound, tinned terminals, or sealing protection as required.
Inspect after commissioning
After the equipment starts operating, check the connection temperature, bolt tightness, and surface condition according to the maintenance plan. High-current, frequently cycled, or vibration-prone connections should be inspected regularly.
Installation guide for copper aluminum bimetallic washers
Correct installation direction, clean contact surfaces, and proper clamping pressure are essential for reliable conductivity and long-term performance.
Identify the copper and aluminum sides
Check both sides before installation. The copper side should face the copper busbar, copper terminal, or other copper conductor, while the aluminum side should face the aluminum busbar, aluminum terminal, or other aluminum conductor.
Clean the contact surfaces
Remove oil, metal particles, oxides, and other contaminants from the conductors, terminals, and washer. Do not use washers with visible scratches, warping, or delamination.
Align the mounting holes
Place the washer between the copper and aluminum conductors. Make sure the inner hole aligns with the bolt hole and the outer profile covers the effective contact area without exceeding the available installation space.
Ensure full surface contact
Check that the copper side fully contacts the copper conductor and the aluminum side fully contacts the aluminum conductor. Burrs, debris, or local high spots should not lift the washer or reduce the contact area.
Tighten to the specified torque
Use the bolt grade, washer combination, and torque specified for the equipment or connection system. Torque requirements vary by bolt size, conductor thickness, and joint design, so a single torque value should not be used for all connections.
Add environmental protection
For humid, outdoor, salt-spray, or corrosive environments, use suitable anti-oxidation joint compound, tinned terminals, or sealing protection as required.
Inspect after commissioning
After the equipment starts operating, check the connection temperature, bolt tightness, and surface condition according to the maintenance plan. High-current, frequently cycled, or vibration-prone connections should be inspected regularly.
Installation guide for copper aluminum bimetallic washers
Correct installation direction, clean contact surfaces, and proper clamping pressure directly affect conductivity and long-term reliability.
Identify the copper and aluminum sides
Check both sides before installation. The copper side should face the copper busbar, copper terminal, or other copper conductor. The aluminum side should face the aluminum busbar, aluminum terminal, or other aluminum conductor.
Clean the contact surfaces
Remove oil, metal particles, oxides, and other contaminants from the busbars, terminals, and washer. Do not use washers with visible scratches, warping, or delamination.
Align the mounting holes
Place the washer between the copper and aluminum conductors. Make sure the inner hole aligns with the bolt hole and the outer profile covers the effective contact area without exceeding the available installation space.
Ensure full contact
Check that the copper side fully contacts the copper conductor and the aluminum side fully contacts the aluminum conductor. Burrs, debris, or local high spots should not lift the washer or reduce the contact area.
Tighten to the specified torque
Use the bolt grade, washer combination, and torque specified for the equipment, terminal, or connection system. Torque requirements vary by bolt size, conductor thickness, and joint design, so one torque value should not be used for all connections.
Add environmental protection
For humid, outdoor, salt-spray, or corrosive environments, use suitable anti-oxidation joint compound, tinned terminals, or sealing protection as required.
Inspect after commissioning
After the equipment starts operating, check the connection temperature, bolt tightness, and surface condition according to the maintenance plan. High-current connections and joints exposed to frequent thermal cycling or vibration should be inspected regularly.
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Frequently asked questions about copper aluminum bimetallic washers
Are copper aluminum bimetallic washers the same as single-side copper-plated aluminum washers?
No. A two-layer bimetallic washer is made by permanently bonding copper and aluminum layers with a defined thickness. A single-side copper-plated washer uses aluminum as the base, with a thinner copper coating on one side. Their layer thickness, bonding method, and suitable environments are different.
Which side should face the copper conductor?
The copper side should contact the copper busbar, copper terminal, or other copper conductor. The aluminum side should contact the aluminum busbar, aluminum terminal, or other aluminum conductor.
Is 20% copper / 80% aluminum a fixed ratio?
No. The 20/80 structure is Chalco's main standard option. Other ratios, such as 15/85, 30/70, and 50/50, can also be supplied or customized to drawings.
What standard sizes are available?
Common round sizes include M6, M8, M10, M12, M14, M16, and M20. Non-standard hole diameters, outer diameters, thicknesses, and multi-hole designs are also available.
Can square or custom-shaped washers be produced?
Yes. Chalco can supply round, square, rectangular, notched, and other custom-shaped copper aluminum bimetallic washers, including single-hole, double-hole, multi-hole, and offset-hole designs.
Can replacement washers be made from a sample?
Yes. Customers can provide PDF or DXF drawings, dimensional photos, or an original sample to confirm the profile, hole positions, thickness, copper-to-aluminum contact direction, and assembly requirements.
Can they be used outdoors or in humid environments?
Yes, but the washer should be selected based on humidity, salt spray, terminal surface treatment, and sealing conditions. Tinned terminals, anti-oxidation joint compound, or sealing protection may also be required in humid, outdoor, or marine environments.
Can the washer be reused?
Reuse is not recommended if the washer shows deformation, scratches, oxidation, burrs, delamination, or contact surface damage after removal. New washers are a better choice for critical electrical connections.
How are copper aluminum bimetallic washers packed?
Small round washers can be packed in bags by quantity and then placed in cartons. Large, square, and custom-shaped washers can be stacked in layers with paper, plastic film, or other protective materials between them. The outer packaging can be marked with the size, material, copper-to-aluminum ratio, quantity, and production batch.
What is the minimum order quantity?
The minimum order quantity depends on the size, processing method, and production volume. Standard round sizes can often use existing tooling, while non-standard or custom shapes may require stamping, laser cutting, waterjet cutting, or machining. The final MOQ is confirmed after the drawing and production plan are reviewed.
Can samples be provided first?
Samples of common sizes may be available depending on stock. For custom products, a sample or first article can be produced to confirm dimensions, hole positions, layer thickness, contact direction, and assembly fit.
How long is the production lead time?
Lead time depends on copper-aluminum material preparation, product size, order quantity, processing method, tooling requirements, and inspection items. Standard round sizes are usually faster, while new tooling and complex custom shapes require more preparation time.
What information is needed for a quotation?
Please provide the product shape, inner diameter, outer diameter, total thickness, copper-to-aluminum ratio, hole positions, order quantity, service environment, and drawing so we can confirm the suitable structure, processing method, and quotation.
