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6061 T651 Aluminum Plate
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6061-T651 aluminum plate is a precision-stretched version of the widely used 6061 alloy in the 6000 series. It is produced through solution heat treatment, artificial aging, and mechanical stress relief by stretching, which makes it more stable and suitable for high-precision machining applications.
Compared with other 6061 tempers, T651 is considered the most dimensionally stable and machining-friendly condition.
What Does T651 Mean?
The “T651” temper has three key steps:
- T6: Solution heat-treated and artificially aged
- T6 strength level: High mechanical strength achieved
- T651: Stress relieved by controlled stretching
👉 The stretching process reduces internal stress and improves flatness stability.
Key Characteristics of 6061-T651
- High strength (same level as T6)
- Excellent dimensional stability
- Low internal stress
- Good machinability
- Reduced deformation after cutting
👉 This makes it ideal for CNC machining and precision components.
6061-T651 vs 6061-T6
| Property | 6061-T6 | 6061-T651 |
|---|---|---|
| Strength | High | High (same level) |
| Internal stress | Higher | Lower |
| Machinability | Good | Excellent |
| Flatness stability | Medium | High |
| Deformation after cutting | Possible | Minimal |
👉 T651 is preferred when precision and flatness after machining are critical.
6061-T651 vs 6061-O (Annealed)
| Property | 6061-O | 6061-T651 |
|---|---|---|
| Strength | Very low | High |
| Formability | Excellent | Limited |
| Machinability | Poor | Excellent |
| Application | Bending/forming | Structural machining |
👉 O temper is for forming, T651 is for machining.
6061-T651 vs 6061-T4
| Property | 6061-T4 | 6061-T651 |
|---|---|---|
| Strength | Medium | High |
| Stability | Medium | High |
| Machining suitability | Moderate | Excellent |
👉 T4 is an intermediate heat-treated state, while T651 is fully stabilized.
Why T651 Is Important in Engineering
The main advantage of T651 over other tempers is:
1. Stress Relief
Internal stress is removed through stretching, reducing:
- Warping after cutting
- Deformation during machining
- Dimensional instability
2. Precision Machining Performance
T651 is widely used in:
- CNC milling
- Precision tooling plates
- Mold base materials
- High-accuracy components
3. Stable Mechanical Properties
T651 maintains consistent strength across the entire plate, making it reliable for structural use.
Common Applications of 6061-T651
1. CNC Machining Industry
- Precision parts
- Mechanical components
- Fixture plates
2. Mold and Tooling Industry
- Mold bases
- Die plates
- Fixture tooling
3. Aerospace and Transportation
- Structural brackets
- Aircraft fittings
- Railway components
4. Industrial Equipment
- Machine base plates
- Structural supports
- High-precision housings
Advantages of 6061-T651 Aluminum Plate
- High strength with excellent stability
- Minimal deformation after machining
- Excellent flatness and dimensional accuracy
- Good corrosion resistance
- Ideal for precision engineering
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