Round Aluminum Plate
What Is a Round Aluminum Plate?
A round aluminum plate is a flat, circular piece of aluminum with a thickness typically above 3 mm — thicker than an aluminum disc or circle blank used for deep drawing. Round aluminum plates are used as structural components, flanges, base plates, covers, and machine parts. They are cut from hot-rolled or cold-rolled aluminum sheet by CNC plasma, laser, or waterjet machines to achieve precise diameters and flat surfaces.
The cutting method affects edge quality. Laser cutting produces the cleanest edge with minimal burr and is ideal for 3–20 mm plates. Waterjet cutting is preferred for very thick plates (20–50 mm) or heat-sensitive alloys. CNC milling can be used to finish the edge to a specific surface roughness.
This page covers everything you need to know before ordering a round aluminum plate: alloy options, size-by-size specifications, pricing factors, and how to choose the right product for your application. If you are looking for round aluminum plates for sale, you can request a quote directly from us as an ISO-certified manufacturer.
Key Properties of Round Aluminum Plate
| Property | Value / Description |
| Density | 2.70–2.73 g/cm³ — one-third the weight of steel |
| Thermal Conductivity | 138–229 W/m·K (varies by alloy) |
| Corrosion Resistance | Excellent — natural oxide layer; enhanced with anodizing |
| Machinability (6061-T6) | Excellent — clean drilling, tapping, and milling |
| Weldability | Good for 1xxx, 3xxx, 5xxx; 6061 requires filler alloy |
| Recyclability | 100% recyclable without quality loss |
| Surface Finish Options | Mill finish, mirror polish, anodized, sublimation-coated |
Round Aluminum Plate — Full Specifications
The table below shows the complete parameter range we supply. Custom specifications outside this range are available on request.
| Parameter | Standard Range | Common Options | Tolerance |
| Alloy Series | 1xxx, 3xxx, 5xxx, 6xxx | 1050, 1060, 1100, 3003, 5052, 5083, 6061, 6082 | Per ASTM B209 / EN 573 |
| Temper | O, H12, H14, H32, T6 | H14 and T6 most common for structural use | Per ASTM B209 |
| Diameter | 50 mm – 1,500 mm (2″–60″) | 100, 150, 200, 300, 400, 500, 600 mm | ± 0.3 mm (laser cut) |
| Thickness | 0.5 mm – 50 mm | 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20 mm | ± 0.1 mm (≤10 mm) |
| Flatness | ≤ 3 mm/m | ≤ 1 mm/m (precision grade) | Per ASTM B209 Table 7 |
| Surface Finish | Mill finish, bright, mirror, anodized | Mill finish standard; Ra 0.4–1.6 μm polished | Visual per EN 573-4 |
| Edge | Laser cut, waterjet cut, machined | Deburred standard; chamfered/radiused on request | Burr height ≤ 0.1 mm |
| MOQ | 1 metric ton | Sample pieces available | — |
| Lead Time | 7–25 business days | Stock sizes: 7–10 days; custom: 15–25 days | — |
Alloy Comparison Table
| Alloy | Temper | Tensile Strength | Yield Strength | Hardness (HB) | Best Use Case |
| 1060 | H14 | 95–130 MPa | 75–105 MPa | ~25 | LED base plates, cookware |
| 1100 | H14 | 110–145 MPa | 95–125 MPa | ~28 | Food equipment, chemical tanks |
| 3003 | H14 | 150–185 MPa | 130–165 MPa | ~40 | Traffic signs, general fabrication |
| 5052 | H32 | 215–265 MPa | 160–210 MPa | ~60 | Marine, pressure vessels, signs |
| 5083 | H116 | 275–350 MPa | 215–285 MPa | ~75 | Shipbuilding, cryogenic tanks |
| 6061 | T6 | 260–310 MPa | 240–276 MPa | ~95 | Structural parts, machined flanges |
| 6082 | T6 | 295–340 MPa | 255–300 MPa | ~100 | High-strength machined components |
Round Aluminum Plate Size Guide — 4″ to 36″
We stock and produce round aluminum plates across a full range of inch-standard sizes most commonly requested by buyers in North America, Europe, and the Middle East.
4 Inch Round Aluminum Plate (~100 mm)
The 4 inch round aluminum plate is one of the most versatile small-format sizes. It fits comfortably in instrument housings, valve covers, and small heat spreaders. At 100 mm, laser cutting holds a diameter tolerance of ±0.2 mm.
| Specification | 4 Inch Round Aluminum Plate |
| Diameter | 100 mm ± 0.3 mm |
| Thickness range | 1 mm – 20 mm |
| Common alloys | 1060, 3003, 5052, 6061 |
| Common uses | LED base, valve cover, instrument blank, award blank |
| MOQ | 100 pcs or 50 kg |
6 Inch Round Aluminum Plate (~150 mm)
The 6 inch round aluminum plate is popular for pump covers, motor end plates, and sublimation blanks. At 150 mm, it is large enough for small flanges and equipment inspection covers. 6061-T6 is preferred when the plate will be drilled or tapped.
| Specification | 6 Inch Round Aluminum Plate |
| Diameter | 150 mm ± 0.3 mm |
| Thickness range | 1 mm – 25 mm |
| Common alloys | 1060, 5052, 6061, 6082 |
| Common uses | Pump cover, motor end plate, flange, sublimation blank |
| MOQ | 100 pcs or 50 kg |
8 Inch Round Aluminum Plate (~200 mm)
The 8 inch round aluminum plate (200 mm) is one of the most-ordered sizes in our range. It covers mid-size flanges, pipe end caps, cookware lid bases, and circular heat sinks for high-power electronics. 5052-H32 is ideal for outdoor or marine environments.
| Specification | 8 Inch Round Aluminum Plate |
| Diameter | 200 mm ± 0.3 mm |
| Thickness range | 1.5 mm – 30 mm |
| Common alloys | 1060, 3003, 5052, 6061 |
| Common uses | Pipe end cap, heat sink base, lid base, flange |
| MOQ | 50 pcs or 50 kg |
12 Inch Round Aluminum Plate (~300 mm)
The 12 inch round aluminum plate is widely used in industrial flanges, wok bases, large LED reflectors, and circular cover plates for machinery. At 300 mm, the plate weight ranges from about 0.6 kg (2 mm, 1060) to 6 kg (20 mm, 6061). Most customers request 6–12 mm thickness for structural flanges.
| Specification | 12 Inch Round Aluminum Plate |
| Diameter | 300 mm ± 0.5 mm |
| Thickness range | 2 mm – 40 mm |
| Common alloys | 3003, 5052, 5083, 6061 |
| Common uses | Industrial flange, wok base, cover plate, lighting reflector |
| MOQ | 50 pcs or 100 kg |
24 Inch Round Aluminum Plate (~610 mm)
The 24 inch round aluminum plate is a large-format product used in vessel manholes, large-bore pipe flanges, architectural ceiling features, and circular bulkhead plates. At 610 mm, handling flatness is critical — we guarantee ≤ 2 mm/m flatness across the full plate.
| Specification | 24 Inch Round Aluminum Plate |
| Diameter | 610 mm ± 0.5 mm |
| Thickness range | 3 mm – 50 mm |
| Common alloys | 5052, 5083, 6061, 6082 |
| Common uses | Vessel manhole, large pipe flange, architectural feature |
| MOQ | 10 pcs or 200 kg |
36 Inch Round Aluminum Plate (~914 mm)
The 36 inch round aluminum plate is among our largest standard sizes. Applications include large industrial covers, architectural disc features, shipbuilding bulkheads, and large-diameter pipeline components. We cut 36 inch plates on a 3,000 × 3,000 mm CNC waterjet table for clean, precise edges.
| Specification | 36 Inch Round Aluminum Plate |
| Diameter | 914 mm ± 1.0 mm |
| Thickness range | 4 mm – 50 mm |
| Common alloys | 5083, 6061, 6082 |
| Common uses | Ship bulkhead, large pipeline cover, architectural |
| MOQ | 5 pcs or 200 kg |
Weight Reference Table (kg per piece, Alloy 6061, density 2.70 g/cm³)
| Size (inch / mm) | 3 mm thick | 6 mm thick | 10 mm thick | 20 mm thick |
| 4″ / 100 mm | 0.064 kg | 0.127 kg | 0.212 kg | 0.424 kg |
| 6″ / 150 mm | 0.143 kg | 0.286 kg | 0.477 kg | 0.954 kg |
| 8″ / 200 mm | 0.254 kg | 0.509 kg | 0.848 kg | 1.70 kg |
| 12″ / 300 mm | 0.572 kg | 1.14 kg | 1.91 kg | 3.82 kg |
| 24″ / 610 mm | 2.36 kg | 4.72 kg | 7.87 kg | 15.74 kg |
| 36″ / 914 mm | 5.31 kg | 10.62 kg | 17.70 kg | 35.40 kg |
Applications of Round Aluminum Plate
Round aluminum plates serve as functional components across a wide range of industries. Below are the main application sectors.
| Application | Description | Recommended Alloy | Common Size |
| Industrial Flanges & Pipe End Caps | Lightweight pipe flanges, blank flanges, and test caps. Drilled bolt patterns available. | 6061-T6 | 8″, 12″, 24″ |
| Pressure Vessel Covers | Manhole covers and dome blanks for pressure vessels and cryogenic tanks. | 5083-H116 | 24″, 36″ |
| Machinery End Caps & Covers | Motor housings, gearbox covers, and pump body sealing plates. | 6061-T6, 5052-H32 | 6″–12″ |
| LED & Lighting Base Plates | Thermally conductive base plates for high-power LED modules. | 1060-H14 | 4″, 6″ |
| Traffic & Road Signs | Circular road signs and warning markers. Good paint adhesion. | 3003-H14, 5052-H32 | 12″–36″ |
| Architectural & Decorative | Ceiling medallions, column caps, wall art, and decorative features. | 1060, 5052 (anodized) | 24″–36″ |
| Shipbuilding & Marine | Hull structures, bulkheads, and deck fittings. Outstanding seawater resistance. | 5083-H116 | 24″–36″ |
| Sublimation & Award Blanks | Photo prints, award medals, nameplates, and commemorative plaques. | 1100-H18 (coated) | 4″, 6″ |
How to Choose the Right Alloy
Choosing the wrong alloy is the most common mistake buyers make. The table below helps you select the right material based on your requirements.
| Your Requirement | Best Alloy | Temper | Reason |
| General fabrication, moderate strength | 3003 | H14 | Good balance of strength and workability |
| Outdoor / marine environment | 5052 / 5083 | H32 / H116 | Best corrosion resistance in saltwater |
| Machining (drilling, tapping, milling) | 6061 / 6082 | T6 | High hardness, clean machining chips |
| Food contact surfaces | 1100 / 3003 | H14 | Food-safe alloy composition |
| High-strength structural use | 6061 / 6082 | T6 | Yield strength 240–300 MPa |
| Welding-intensive fabrication | 5052 / 5083 | H32 | Excellent weld strength retention |
| Anodizing (decorative) | 1060 / 5052 | H14 / H32 | Clean, bright anodize finish |
| Maximum economy, light load | 1060 / 3003 | H14 | Lowest cost per kg |
Tip: Round aluminum plates thicker than 20 mm may retain internal stress from rolling. If you plan to machine the plate significantly, request a stress-relieved temper (e.g., 6061-T651 instead of T6) to prevent distortion during or after machining.
Round Aluminum Plate for Sale — Pricing & How to Order
When searching for round aluminum plates for sale, price is naturally the first concern. The final cost per piece depends on several factors.
1. LME Aluminum Price (Base Metal Cost)
All aluminum products are priced as a fabrication premium over the London Metal Exchange (LME) spot price. The base metal component of the price moves with the market. We quote fabrication premiums separately so you can track cost changes clearly.
2. Diameter × Thickness = Material Weight
A larger or thicker round aluminum plate uses more material. A 12 inch plate at 10 mm thick weighs about 1.9 kg (6061). A 36 inch plate at 10 mm thick weighs about 17.7 kg. Price per piece scales almost linearly with weight above the base cutting cost.
3. Alloy Grade
Higher-performance alloys cost more. Approximate premiums over 1060 pricing: 3003 +5–10%, 5052 +15–25%, 6061 +20–35%, 5083 +25–40%.
4. Cutting Method & Edge Finish
Plasma cutting is most economical for large plates. Laser cutting adds precision. Waterjet handles very thick plates cleanly. Machined edges (turned on a lathe) carry the highest premium but give the best dimensional accuracy.
5. Surface Finish & Anodizing
Mill finish is the base price. Bright or mirror polishing adds 8–20%. Hard anodizing (25 μm) adds 15–30%. Color anodizing adds 20–40%.
6. Order Quantity
Our price breaks are at 100 pcs, 500 pcs, 1 MT, 3 MT, and 5 MT+. Larger orders receive progressively lower per-piece prices.
What to Include in Your Quote Request
Diameter in inches or mm (e.g., 12 inch / 300 mm)
Thickness in mm (e.g., 6 mm)
Alloy and temper (e.g., 5052-H32)
Quantity (pcs or kg)
Edge or surface finish requirements
Destination port or country for freight calculation
With this information, we can respond with a full quotation within 12 hours.
Why Buy Round Aluminum Plates from Us?
| Advantage | Detail |
| Factory Direct | We own the rolling mill, blanking presses, and laser cutting lines. No trading company in between means lower cost and direct communication. |
| Any Size, Any Alloy | From a 4 inch round aluminum plate to a 36 inch round aluminum plate, standard or custom. We cut to your exact drawing or dimension list. |
| Full Documentation | Mill Test Certificate (MTC), EN 10204 3.1 inspection report, and packing list included with every shipment. |
| In-House Testing | Chemical composition (OES), tensile testing, Brinell hardness, and surface roughness measured on-site. |
| Export-Ready Packing | Plates interleaved with protective paper, packed on sea-worthy wooden pallets, stretch-wrapped. |
| Responsive Service | Dedicated export sales team. Response within 12 hours on weekdays. Sample pieces dispatched within 3 business days. |
Global Export & Shipping
We ship round aluminum plates to over 60 countries by sea, air, and express courier. Loading ports: Tianjin, Shanghai, Guangzhou. Typical sea transit: Europe 25–30 days, US East Coast 28–35 days, US West Coast 20–25 days, Middle East 18–22 days.
Main export markets: United States, Canada, Germany, Netherlands, France, Italy, Spain, Poland, Saudi Arabia, UAE, Turkey, Brazil, Mexico, Australia, South Korea, Vietnam, Indonesia, South Africa.
| Shipment Type | Suitable For | Min. Qty | Typical Transit |
| Express Courier (DHL/FedEx) | Samples, small orders ≤ 50 kg | 1 pc | 3–7 days door-to-door |
| Air Freight | Urgent orders ≤ 500 kg | 10 kg | 5–10 days airport-to-airport |
| LCL Sea Freight | 0.5–5 MT orders | 0.5 MT | 20–40 days port-to-port |
| FCL Sea Freight | 5 MT+ orders (20′ or 40′ container) | 5 MT | 20–40 days port-to-port |
Frequently Asked Questions
Q: What is the difference between a round aluminum plate and an aluminum disc?
In manufacturing terminology, “aluminum disc” (or aluminum circle) usually refers to thin blanks (0.3–3 mm) used as starting material for deep-drawn cookware, lighting reflectors, and packaging. A “round aluminum plate” typically refers to a thicker, structurally used circular piece (3 mm and above) that stays flat and is machined, bolted, or welded into assemblies.
Q: Can I order a non-standard diameter such as 10 inch or 18 inch?
Yes. We cut to any diameter from 50 mm to 1,500 mm using CNC laser and waterjet cutting. Non-standard sizes carry no additional tooling charge for laser-cut plates up to 20 mm thick. Minimum order for custom sizes is typically 50 pieces or 500 kg.
Q: Which alloy for a 12 inch round aluminum plate used as a pipe flange?
For standard flanging, 6061-T6 is most common — it machines cleanly, holds threads well, and provides adequate strength. If the flange is exposed to seawater or chemicals, use 5052-H32 or 5083-H116. For light loads where cost matters, 3003-H14 is economical.
Q: Do you provide CNC drilling or custom machining?
Yes. We offer value-added CNC machining including bolt-hole circle drilling, center bore, countersinking, chamfering, and surface milling. Please provide your drawing (DXF, DWG, or PDF) when requesting a quote.
Q: What is the flatness guarantee on 24 inch and 36 inch plates?
We guarantee flatness of ≤ 3 mm/m for plates cut from standard hot-rolled sheet. Precision-grade flatness (≤ 1 mm/m) is available from cold-rolled or stretched sheet at extra cost. Plates above 20 mm may require stress relief to maintain flatness after machining.
Q: Can I get a sample before placing a bulk order?
Yes. We provide sample pieces of standard sizes in 1060, 3003, 5052, and 6061. Sample cost is at the per-piece price plus express freight, credited back against your first bulk order. Most sample requests are dispatched within 3 business days.
Q: What surface finishes are available for round aluminum plates for sale?
Options include: mill finish, degreased bright finish, mirror-polished (Ra ≤ 0.4 μm), natural anodized (clear, 10–25 μm), hard anodized (25–50 μm), color anodized (black, gold, silver, bronze), and sublimation coating for photo print applications.
