Material datasheet · Mg-Al-Zn alloy
Magnesium Alloy AZ31B
UNS M11311 · H24 (strain-hardened, partial anneal) or O (annealed)
Lightest commonly-machined structural metal. Excellent damping. Fire-safe machining required.
Chemical composition
Nominal % by weight.
| Element | % by wt |
|---|---|
| Mg | Bal. |
| Al | 2.5–3.5 |
| Zn | 0.6–1.4 |
| Mn | ≥0.20 |
Applicable specifications
AMS / ASTM / MIL.
- AMS 4375 (AZ31B-O, sheet/plate)
- AMS 4377 (AZ31B-H24, sheet/plate)
- ASTM B107
Machining guidance
CNC parameters and tooling.
Sharp carbide or HSS
Fire-safe machining required: sharp tools, large chip evacuation, no water-based coolant. Class D fire extinguisher on hand.
Stock & cost
Forms and Q1 2026 pricing.
- Chromate conversion (MIL-DTL-5541 equivalent for Mg)
- E-coat
- Anodize (Tagnite, Keronite)
Typical applications
Where Magnesium AZ31 is the right pick.
- Aerospace lightweight brackets
- Electronics housings
- Optical mounts
- Racing components
- Camera bodies
Alternative materials
Substitute or upgrade options.
- AZ91 (cast)
- WE43 (high T, aerospace)
- Aluminum 6061 (heavier, safer)
Digital Machine · Quick-Turn CNC · California
Machine your part in Magnesium AZ31.
Production CNC milling and turning. Confirm material, inspection and documentation requirements when requesting a quote.
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Related tools & references
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Aerospace specs that call out this alloy.