Aluminum Plate Thickness & Sheet Metal Gauge Chart

Choosing the right aluminum plate thickness is crucial because it affects weight, strength, machinability and cost. Common options include 2 mm and 3 mm plates for decorative and processed uses, 10 mm and 20 mm plates for structural parts in construction and marine, and heavier sizes like 25 mm, 50 mm, 100 mm or even 200 mm ultra-thick plates for tooling, aerospace and heavy equipment.

To make selection easier, Chalco offers a comprehensive thickness chart with mm, inch and gauge equivalents, covering all popular sizes from 2 mm up to 200 mm and beyond. Below is a quick overview of the four main thickness ranges, each linking to detailed charts and applications:

• 2–6 mm Thin Plates: 2 mm, 3 mm, 5 mm, 6 mm 
• 6–25 mm Medium Plates: 8 mm, 10 mm, 12 mm, 16 mm, 20 mm, 25 mm 
• 25–200 mm Thick Plates: 30 mm, 40 mm, 50 mm, 60 mm, 100 mm, 150 mm 
• 200 mm+ Ultra-Thick Plates: 200 mm, 250 mm, 300 mm, 400 mm

2–6mm Aluminum Plate (2mm / 3mm / 5mm / 6mm)

Common tempers: O, H14, H24, H32 (ideal for bending, anodizing, perforation)

Typical alloys: 1100, 3003, 5052, 5754, 6061

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The 2–6 mm aluminum plate range covers some of the most frequently purchased sizes in the market. Among them, 2 mm, 3 mm, 5 mm, and 6 mm aluminum plates are especially popular for their balance of lightweight, strength, and versatility. These thicknesses are widely used for decorative, architectural, and processed aluminum sheets.

Standard thickness & size reference:

Applications:

• 2 mm & 3 mm: decorative panels, signage, cladding, lightweight covers
• 4 mm & 5 mm: construction panels, partitions, industrial housings
• 6 mm: marine panels, transport components, small tooling

Processed aluminum plates available in this range:

• Embossed / checkered (2–5 mm): anti-slip flooring, decorative panels
• Perforated (1.5–6 mm): ventilation, filtration, acoustic panels
• Anodized & color-coated (2–8 mm): decorative and protective finishes
• Brushed / polished: electronic housings, interior design

6–25 mm Aluminum Plate (10 mm / 20 mm / 25 mm)

Common tempers: 6061/6082-T6/T651, 5083-H111/H116/H321

Typical alloys: 5083, 5754 (marine), 6061, 6082, 7075

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The 6–25 mm aluminum plate range covers popular structural sizes such as 8 mm, 10 mm, 12 mm, 16 mm, 20 mm, and 25 mm. These thicknesses are widely used in construction, transportation and marine projects for frames, decks and chassis components.

Standard thickness & size reference:

Applications:

• 10–16 mm: building frames, platforms, industrial covers, transport brackets
• 20–25 mm: marine deck plates, chassis members, heavy-duty structural parts

Processing options in this range:

• Mill / machined flat plates, optional face milling for tighter flatness
• Anodizing available on selected alloys and surface requirements
• Custom perforation for ventilation/guards when design allows
• Cut-to-size service for quick installation and reduced waste

25–200 mm Aluminum Plate (50 mm / 100 mm / 150 mm)

Common tempers: 6061-T651, 6082-T651, 7075-T651, 2024-T351, 7050-T7451

Typical alloys: 6061, 6082, 7075, 2024, 7050

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The 25–200 mm aluminum plate range is widely chosen for heavy-duty applications. Popular thicknesses include 30 mm, 40 mm, 50 mm, 60 mm, 100 mm, and 150 mm. These thick plates provide excellent load-bearing capacity, dimensional stability, and machining performance, making them ideal for mold bases, aerospace tooling, shipbuilding, and mechanical structures.

Standard thickness & size reference:

Applications:

• 50 mm & 60 mm plates: precision mold bases, industrial jigs, heavy equipment parts
• 100 mm plate: marine structures, large machine frames, aerospace ground tooling
• 150–200 mm plates: defense components, large ship panels, high-load aerospace tooling

Processing options in this range:

• Stress-relieved thick plates (T651, T7451) for reduced machining distortion
• Face milling / double-sided machining for precision flatness
• Custom cutting and block supply for mold manufacturing
• Surface protection films to prevent scratches during transport and machining

200 mm+ Ultra-Thick Aluminum Plate (200 mm / 300 mm / 400 mm)

Common tempers: Custom supply, mostly T651 / T7451 (stress relieved after forging or extrusion)

Typical alloys: 6061, 7075, 2219

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The 200 mm+ aluminum plate category includes 200 mm, 250 mm, 300 mm, and even 400 mm ultra-thick plates. These heavy sections are rarely available as stock and are usually produced through customized extrusion, forging, or rolling processes with ultrasonic inspection to guarantee internal quality. Ultra-thick plates are designed for applications where maximum strength, rigidity, and durability are required.

Standard thickness & size reference:

Applications:

• Aerospace & defense: wing spars, landing gear, heavy structural components
• Energy & marine: offshore platforms, LNG tanks, pressure-resistant structures
• Heavy machinery: press bases, large machine frames, industrial tooling
• Defense vehicles: armored structures, ballistic protection elements

Processing options in this range:

• Custom forging and extrusion for non-standard shapes and extra strength
• Ultrasonic & radiographic testing to ensure defect-free internal quality
• Heat treatment & stress relief to improve toughness and stability
• Project-specific cutting & machining according to drawings

Chalco Aluminum Plate Standard Thickness & Stock Sizes

For quick delivery, Chalco keeps a wide range of aluminum plate thicknesses in stock. All dimensions are available in both metric (mm) and imperial (inch) references, with cutting-to-size service on request.

Hot-selling / Regular Stock (mm ↔ inch):

• 2 mm (≈ 0.079″), 3 mm (≈ 0.118″), 5 mm (≈ 0.197″), 6 mm (≈ 0.236″)
• 8 mm (≈ 0.315″), 10 mm (≈ 0.394″), 12 mm (≈ 0.472″), 16 mm (≈ 0.630″)
• 20 mm (≈ 0.787″ ≈ 3/4″), 25 mm (≈ 0.984″ ≈ 1″)
• 1/8″ (≈ 3.18 mm), 3/16″ (≈ 4.76 mm), 1/4″ (≈ 6.35 mm), 3/8″ (≈ 9.53 mm), 1/2″ (≈ 12.7 mm), 3/4″ (≈ 19.05 mm), 1″ (≈ 25.4 mm)

Common sheet sizes (mm): 1000×2000, 1250×2500, 1500×3000, 1525×3660, 2000×4000, 2000×6000 (other sizes can be cut to order)

Processing forms: Mill finish, Embossed/Tread, Perforated, Anodized/Color anodized

Stock highlights (examples):

Need the full stock list (by alloy, temper and exact plate size)? Click here for the detailed stock size reference or Request today's stock.

Sheet Metal Gauge Chart (Aluminum)

In many international markets, especially in North America, aluminum sheet thickness is often expressed in gauge instead of millimeters or inches. The gauge system is non-linear and differs from steel gauge, so it is important to use a proper conversion table. For aluminum plates thicker than about 6 mm, buyers usually specify thickness in mm or inch directly.

Quick reference (common aluminum range #10–#30):

Chalco supports mm, inch, and gauge expressions for aluminum sheet thickness. This makes it easier for international customers to match local standards. For thin plates overlapping with our 2–6 mm aluminum plates, gauge references can be provided on request.

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Chalco Aluminum Plate Alloys & Tempers Quick Pick

Quick view of popular alloys and tempers, available from stock or cut-to-size. Click to see specifications, inventory, and applications.

Applications of Chalco aluminum plate — by Thickness & Industry

Different aluminum plate thicknesses map to different industries and use cases. Chalco matches each range with suitable alloys and tempers to balance strength, corrosion resistance and machinability.

• 2–6 mm → Building & decoration, signage, interior cladding, processed plates (embossed / perforated / anodized)
• 6–25 mm → Marine decks & hull panels, automotive chassis and body panels, construction platforms & brackets
• 25–200 mm → Mold bases, heavy machinery frames, precision jigs, marine structures, aerospace ground tooling
• 200 mm+ → Aerospace spars & structural parts, defense armor, offshore energy and pressure-resistant structures

Tooling & Mold Plates

Thickness: 25–200 mm · Alloys: 6061, 7075

Used in plastic molds, jigs and heavy machining tools, offering 30–40% cost savings compared to steel.

Aerospace & Defense

Thickness: 50–200 mm+ · Alloys: 2024, 7075, 7050, 2219

Key material for aircraft structures, armored vehicles and defense equipment.

Automotive Plates

Thickness: 6–25 mm · Alloys: 5083, 6061

Applied in dump trucks, tankers and specialty vehicles for lightweight and durability.

Marine Plates

Thickness: 6–100 mm · Alloys: 5083, 5086, 6061

Extensively used in ship hulls, decks and naval vessels with high corrosion resistance.

Chemical & Storage Plates

Thickness: 5–70 mm · Alloys: 5083

Applied in LNG, liquid oxygen tanks and petrochemical storage containers.

Chalco Aluminum Plate Production & Stock Capabilities

Chalco integrates advanced production lines, extensive stock, and strict quality control to deliver high-performance aluminum thick plates worldwide.

Advanced Equipment – 1+4 hot rolling line (2–250 mm), 5600-ton stretching & quenching, forging/extrusion for 200–400 mm plates, and casting up to 1100 mm.

Wide Stock & Flexible Supply – Regular 2–25 mm plates, tooling grades 30–200 mm (6061-T651, 7075-T651, 2024-T351, 7050-T7451), and customized ultra-thick plates, all with cut-to-size service.

Strict Quality Assurance – ISO 9001 certified, with ultrasonic, radiographic, metallographic, and chemical inspections ensuring dimensional accuracy and material integrity.

With this combination, Chalco ensures fast delivery of standard sizes and reliable supply of custom-engineered plates for aerospace, tooling, marine, defense, and industrial projects.

Chalco aluminum plate stock size reference table