7075 T651 Aluminum Plate​

What Is 7075 T651 Aluminum Plate?

7075 T651 aluminum plate is a heat-treated Al-Zn-Mg-Cu alloy known for high strength and hardness. The T651 temper is particularly suited to thick plate and precision-machined parts where dimensional stability is important. Union Aluminium supplies 7075 T651 plate with hardness above 160 HB for aerospace components, molds, automation equipment and other high-load machined parts.

What does T651 mean in 7075 aluminum? T651 indicates that the material has been solution heat-treated, stress-relieved by controlled stretching, and then artificially aged. The stress-relief step reduces residual internal stress in the plate. As a result, the material is less likely to distort when it is saw-cut, milled or extensively machined—a key advantage when producing large or precision components from 7075 plate.

For projects involving substantial material removal or tight dimensional tolerances, 7075 T651 is generally preferred over standard T6 plate because of its improved stability during machining.

T651 Treatment:
Solution Heat Treatment → Stress Relief by Stretching → Artificial Aging → T651

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Why Choose T651 for Precision Machining?

For precision-machined 7075 components, strength alone is not enough. Material stability during cutting, milling and drilling is also important, especially when machining thick plates or removing a large amount of material. The T651 temper is stress-relieved after solution heat treatment, helping reduce residual stress and the risk of distortion during machining.

Reduced Internal Stress

T651 plate is stress-relieved by controlled stretching before artificial aging. This reduces residual stresses within the plate, making it better suited to parts that require extensive material removal.

Better Dimensional Stability

Lower residual stress helps the workpiece maintain its shape during milling, drilling and cutting. This is particularly useful for large plates, thin-wall features and precision components where flatness and dimensional tolerances must be controlled after machining.

High Strength-to-Weight Ratio

7075 aluminum provides high mechanical strength without the weight of many steel materials. It is commonly selected for structural and machined components where both load capacity and weight reduction are important.

Good Machinability

7075 T651 is well suited to CNC milling, drilling, turning and other machining operations. Combined with its high strength and improved dimensional stability, it is a practical material choice for precision components, tooling, jigs, fixtures and other high-load machined parts.

For parts requiring heavy machining or tight dimensional control, T651 is generally preferred over standard T6 plate because of its stress-relieved condition.

7075 T6 vs. 7075 T651: Which Should You Choose?

7075 T6 and 7075 T651 use the same 7075 Al-Zn-Mg-Cu alloy and both provide high strength after heat treatment. The main difference is the stress-relief process. T651 receives controlled stretching to reduce residual stress before artificial aging, while T6 does not include this stress-relief designation.

This difference becomes important when the plate will undergo extensive CNC machining. Removing material from a plate can release residual stresses and cause the workpiece to move, warp or lose flatness. For this reason, T651 is commonly selected for thick plate, machining blanks and precision components where dimensional stability is important.

Comparison	7075 T6	7075 T651
Alloy	7075 Al-Zn-Mg-Cu	7075 Al-Zn-Mg-Cu
Heat Treatment	Solution heat-treated and artificially aged	Solution heat-treated, stress-relieved by stretching and artificially aged
Stress Relieved	No specific stress-relief treatment designated	Yes
Strength Level	Very high	Very high
Residual Stress	Higher than T651	Reduced by controlled stretching
Dimensional Stability During Machining	Suitable for general machining	Better suited to extensive machining
Risk of Distortion After Heavy Material Removal	Higher	Lower
Typical Product Form	Sheet, plate and structural products	Commonly specified for plate and machining stock
CNC Machining	Suitable	Preferred for precision or heavy machining
Typical Applications	High-strength structural parts, aircraft components and general high-load parts	Machined aerospace parts, tooling, jigs, fixtures, molds and precision components

When Should You Choose 7075 T6?

Choose 7075 T6 when the main requirement is high mechanical strength and the part requires limited machining or does not have demanding dimensional stability requirements. It is suitable for many high-strength structural components where extensive material removal is not part of the manufacturing process.

When Should You Choose 7075 T651?

Choose 7075 T651 when the plate will be heavily milled, drilled, pocketed or machined from a thick blank. The stress-relieved condition is particularly useful for large components, thin-wall features, tooling plates, fixtures and precision parts where maintaining flatness and final dimensions after machining is important.

For example, when a thick plate is machined down significantly to produce a complex component, internal stresses can redistribute as material is removed. T651 does not eliminate every source of machining distortion, but its reduced residual stress helps lower this risk compared with material that has not received the same stress-relief treatment.

Which Is Better for CNC Machining?

For thick plates requiring extensive CNC machining or tight dimensional control, 7075 T651 is generally preferred because the stress-relief treatment helps reduce distortion during material removal.

If the application mainly requires high strength with only light machining, 7075 T6 may be sufficient. For heavily machined parts, machining blanks or components with tighter dimensional requirements, T651 is normally the more appropriate choice.

7075 T651 Aluminum Plate Stock Sizes

Union Aluminium stocks 7075 T651 aluminum plate from 8 mm to 300 mm thick, covering common sizes for CNC machining, tooling, molds and high-strength structural parts. Regular plate sizes include 1250 × 2500 mm and 1500 × 3000 mm, with multiple thicknesses available for project and batch orders. Plate up to 350 mm thick can also be supplied subject to production confirmation.

Stock Item	Available Range
Stock Thickness	8–300 mm
Typical Thicknesses	8 / 15 / 18 / 20 / 25 / 30 / 35 / 40 / 45 / 50 / 55 / 60 / 80 / 90 / 100 / 120 / 150 / 180 / 200 / 300 mm
Standard Sizes	1250 × 2500 mm / 1500 × 3000 mm
Maximum Production Thickness	Up to 350 mm
Custom Sizes	Saw-cut plate and blocks available

For machining blanks or non-standard parts, plates can be saw-cut to the required width and length instead of supplied only as full sheets. Send us your thickness × width × length and quantity to check current stock and cutting availability.

Cut-to-Size 7075 T651 Aluminum Plate

Union Aluminium provides cut-to-size 7075 T651 aluminum plate for customers who need machining blanks rather than full-size plates. With in-house sawing capability, stock plates can be cut to specified width and length for CNC machining, tooling, fixtures and other precision components.

We supply rectangular 7075 aluminum blocks and plate blanks in single pieces or batch quantities. Cutting can be arranged from your size list or drawing, helping reduce unnecessary material purchase and preparation work before machining.

• Saw Cutting: Straight saw cutting is available for stocked 7075 T651 plate, from single blanks to batch quantities.
• Custom Plate & Blocks: Full plates can be cut into rectangular 7075 aluminum blocks or plate blanks to match your required dimensions.
• Machining Blanks: Pre-cut blanks reduce excess material and preparation work before CNC milling, drilling or further machining.
• Size-Based Cutting: Provide the required thickness × width × length and quantity. We will check suitable stock and confirm the cutting arrangement before order.

For a cutting quote, send us the plate thickness, finished blank size, quantity and applicable material standard. We will match the requirement with available stock and confirm the suitable cutting arrangement.

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Cut-to-Size 7075 T651 Plate

Reduce material waste and machining preparation. Tell us your required dimensions, tolerances and quantity for custom-cut 7075 T651 plate.

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Applications

7075 T651 plate is mainly specified for components requiring high strength, low weight and good stability during machining. Its stress-relieved condition is particularly useful for thick plates and parts involving substantial material removal.

7075 T651 vs. 6061 T651 Aluminum Plate

Both 7075 T651 and 6061 T651 are stress-relieved aluminum plates suitable for machining, but they serve different engineering requirements. 7075 T651 is selected primarily for higher strength and heavily loaded machined parts, while 6061 T651 is a more general-purpose choice where weldability, corrosion resistance and material cost are important.

Property	7075 T651	6061 T651
Alloy Series	7xxx, Al-Zn-Mg-Cu	6xxx, Al-Mg-Si
Strength	Very high	Medium to high
Hardness	Higher	Lower
Machinability	Very good	Good
Dimensional Stability	Good for precision machining	Good for general machining
Weldability	Limited	Good
Corrosion Resistance	Moderate	Better
Material Cost	Higher	More economical
Typical Parts	High-load machined parts, aerospace structures, tooling, jigs and fixtures	Machine frames, structural parts, equipment components and general machined parts

Which Grade Should You Choose?

Choose 7075 T651 when high strength, hardness and machining performance are the main requirements. It is better suited to aerospace structures, high-load components, tooling and precision parts machined from thick plate.

Choose 6061 T651 when the component requires a balance of strength, machinability, weldability, corrosion resistance and cost. It is generally more practical for machine structures, equipment parts and general industrial fabrication.

For heavily loaded or weight-sensitive machined components, 7075 T651 is usually the stronger choice. For welded structures and general-purpose machining, 6061 T651 is typically more economical and easier to fabricate.

Why Choose Shandong Union for 7075 T651 Aluminum Plate?

Shandong Union produces and supplies 7075 T651 aluminum plate for machining, tooling and structural applications. Our production lines include GAUTSCHI melting and holding furnaces, continuous hot rolling equipment and SMS CVC cold rolling mills. Plate thickness, flatness, surface condition and mechanical properties are checked during production and before delivery.

We supply standard plate sizes as well as cut-to-size material for specific orders. Saw cutting and CNC machining are available for customers who need finished blanks or parts made to drawing. Each order can be supplied with the required material documentation and inspection records.

Quality Control

Each 7075 T651 plate is checked against the applicable material specification and order requirements before shipment, with inspection focused on material properties, dimensions and surface condition.

Chemical Composition Verification: Material chemistry is checked against the specified 7075 alloy requirements.

Mechanical Property Testing: Strength, elongation and hardness are verified according to the applicable specification.

Dimensional Inspection: Plate thickness, width, length and applicable tolerances are checked before shipment.

Flatness & Surface Inspection: Plate flatness and visible surface condition are inspected against order requirements.

Material Identification: Alloy, temper and relevant batch information are maintained for material identification.

Documentation: Required material certificates and inspection documents can be confirmed with the order.

Packaging & Delivery

7075 T651 aluminum plates are packed for export with protection against surface damage during handling and transportation. Packing can be arranged according to plate size, shipment method and order requirements.

FAQ

What is 7075 T651 aluminum plate?

7075 T651 aluminum plate is a high-strength Al-Zn-Mg-Cu alloy plate that has been heat-treated and stress-relieved. It combines high hardness and strength with improved stability during machining. It is mainly used for aerospace structures, tooling, CNC-machined parts, automation equipment and other components requiring high mechanical strength with reduced weight.

What does T651 mean in 7075 aluminum?

T651 indicates that 7075 aluminum has been solution heat-treated, stress-relieved by controlled stretching and artificially aged. The stress-relief step reduces residual internal stress in the plate. This helps lower the risk of movement or distortion when thick plate is saw-cut, milled or extensively machined, making T651 particularly suitable for precision machining applications.

What is the hardness of 7075 T651 aluminum plate?

Union Aluminium’s product data lists 7075 T651 plate hardness above 160 HB. Actual properties should be confirmed against the required plate thickness and applicable material specification, especially for engineering design or material approval. For projects with specified mechanical-property requirements, the required hardness, thickness and standard should be provided with the RFQ.

What is the difference between 7075 T6 and T651?

Both are high-strength tempers of the same 7075 alloy, but T651 includes stress relief by controlled stretching. This reduces residual stress and improves dimensional stability during extensive machining. T6 is suitable where high strength is the main requirement, while T651 is generally preferred for thick plates, machining blanks and precision parts where distortion control is important.

Is 7075 T651 good for CNC machining?

Yes. 7075 T651 is well suited to CNC machining, particularly for high-strength parts produced from thick plate. Its stress-relieved condition helps reduce dimensional movement as material is removed during milling, drilling and other machining operations. It is commonly selected for machining blanks, tooling, jigs, fixtures and precision components where both strength and dimensional stability are required.

What is the difference between 7075 and 6061 aluminum plate?

7075 provides higher strength and hardness, making it more suitable for high-load structures, tooling and demanding machined components. 6061 offers a better balance of weldability, corrosion resistance, fabrication performance and cost for general industrial use. For heavily loaded or weight-sensitive machined parts, 7075 is usually preferred; for welded structures and general-purpose components, 6061 is often more practical.

What is the difference between 2024 and 7075 aluminum?

Both 2024 and 7075 are high-strength heat-treatable aluminum alloys, but their alloy systems differ. 7075 is an Al-Zn-Mg-Cu alloy, while 2024 is primarily an Al-Cu alloy. Union Aluminium’s product data lists 7075 T651 hardness above 160 HB, compared with approximately 120 HB for the referenced 2024 material. Final selection should be based on the required temper, strength, machining conditions and applicable specification.

Can 7075 T651 aluminum plate be cut to custom sizes?

Yes. Union Aluminium provides saw cutting for 7075 T651 aluminum plate and can supply rectangular plates, blocks and machining blanks to specified dimensions. Send your required thickness × width × length, quantity and material standard with your inquiry. We can check available stock and confirm a suitable cutting arrangement before order.