6061-T651 Aluminum Plate Thickness Options: How to Choose for Your Application

Standard thicknesses in inches and millimeters (common stock sizes):

Thickness Selection Guide by Application

1. Precision CNC Machining & 3C Electronics

For smartphone frames, laptop housings, and precision components, thin to medium plates (0.3–20 mm) are typically specified. The T651 temper‘s low internal stress ensures dimensional stability during and after machining—critical for thin walls, tight tolerances, and complex geometries . Typical applications include phone card slots, computer brackets, camera parts, and electronic enclosures .

2. Mold and Die Manufacturing

Mold bases, injection molds, and tooling plates commonly use medium plates (12–50 mm) . The stress-relieved T651 temper prevents warping during extensive material removal, ensuring the mold remains flat and accurate . Flatness of ≤0.1 mm/m is achievable for precision applications .

3. Structural & Industrial Components

For machine bases, frames, and structural parts, medium to thick plates (10–100 mm) are recommended. These plates offer the strength and rigidity needed for load-bearing applications . Common uses include automation equipment frames, railway components, and truck chassis parts .

4. Marine Applications

Shipbuilding and offshore engineering typically use 6–50 mm plates with classification society certifications (DNV, CCS, ABS). Thicker plates are used for hull structures and heavy-duty components, while thinner plates are used for decks and superstructures .

5. Aerospace & Heavy-Duty

Aerospace and military applications often require 0.25″–1″ (6.35–25.4 mm) plates meeting AMS 4027 specifications . Extra-thick plates (200–600 mm) are used for specialized heavy equipment, nuclear components, and large structural parts .

Key Factors to Consider When Choosing Thickness

1. Load Requirements

2. Machining and Fabrication Needs

Thinner plates (0.3–6 mm) : Easier to cut, bend, stamp, and weld; lower material cost; may require reinforcement for structural use

Medium plates (6–100 mm) : Best for CNC milling, drilling, and precision machining; stable and warp-resistant

Thick plates (100–500 mm) : Require heavy-duty equipment; ideal for high-load applications; best for large-scale structural parts

3. Dimensional Tolerances

Standard tolerances for 6061-T651 plate are typically ±0.005″ to ±0.03″ (±0.127 mm to ±0.762 mm) . Precision tolerances as tight as ±0.001″ (±0.025 mm) are available for critical applications . Mingtai maintains tight thickness tolerances across all specifications .

4. Corrosion Resistance and Environment

For outdoor, marine, or corrosive environments, thicker plates provide longer service life. Anodizing and other surface treatments can further enhance durability .

5. Weight vs. Cost Efficiency

Thicker plates add weight and cost. The correct thickness provides adequate strength without unnecessary material expense—balancing performance, budget, and manufacturability .

Why Choose Mingtai Aluminum for 6061-T651 Plate?

●Over 28 years of aluminum experience – Publicly traded company (Stock Code: 601677) with dedicated precision-grade production lines

●Full thickness range – 0.3mm to 500mm, supporting diverse applications

●Stress-relieved T651 temper – 1–3% pre-stretching eliminates internal stress and prevents machining distortion

●Precision manufacturing – Tight tolerances, excellent flatness (≤0.1 mm/m available)

●Wide width capability – Up to 2,800mm

●Global compliance – ASTM B209, EN 485, GB/T standards

●IATF 16949, ISO 9001, ISO 14001 certified – Automotive-grade quality management

●Flexible ordering – Free sample testing available; stock and custom options

●Fast delivery – 7–35 days to over 30 countries

Conclusion

Choosing the right 6061-T651 aluminum plate thickness requires careful consideration of your application‘s load requirements, machining needs, environmental conditions, and cost constraints. Whether you need thin plates for precision electronics, medium plates for CNC machining and molds, or thick plates for heavy-duty structural components, Mingtai Aluminum provides the quality, consistency, and expertise to meet your specifications .

Contact Mingtai Aluminum today for free samples, technical data sheets, or a factory-direct quotation for your project.

FAQ – 6061-T651 Aluminum Plate Thickness Selection

Q1: What thicknesses of 6061-T651 plate does Mingtai supply?
A: Mingtai supplies 6061-T651 plate from 0.3mm to 500mm, with widths up to 2,800mm and customizable lengths .

Q2: What is the difference between 6061-T6 and 6061-T651?
A: T651 undergoes the same heat treatment as T6, with an additional 1–3% pre-stretching process that relieves internal residual stresses. This provides the same strength with superior dimensional stability and reduced warping during machining .

Q3: What thickness is recommended for CNC machining of precision parts?
A: For precision CNC parts such as molds, jigs, and fixtures, 12–50 mm is typical. Thicker plates provide better stability during heavy material removal .

Q4: Can I get custom thicknesses not listed in standard sizes?
A: Yes. Mingtai offers custom thicknesses from 0.3mm to 500mm. Please contact our sales team with your specific requirements .

Q5: What is the flatness tolerance for 6061-T651 plate?
A: Standard flatness is typically ≤0.1 mm/m. Precision grades with tighter tolerances are available upon request .

Q6: What certifications does Mingtai hold for aluminum plate?
A: Mingtai is IATF 16949, ISO 9001, and ISO 14001 certified, ensuring automotive-grade quality management. Products meet ASTM B209, EN 485, and GB/T standards .

Q7: What is the minimum order quantity?
A: Sample quantities are available for validation. Please contact our sales team for specific MOQ details.

Q8: How is the plate packaged for shipment?
A: Plates are packaged with moisture-proof wrapping, edge protectors, and optional protective interleaving to prevent surface damage during transit .

Mingtai Aluminum – Precision Materials Division

Phone: +86-18776078273

Email: sales@mingtai-al.com

Website: https://m.mingtai-al.com/

Factory Address: Gongyi City Industrial Agglomeration Area, Henan, China