Material datasheet · Cast aluminum tooling plate (Al-Si)
MIC-6 Cast Aluminum Tooling Plate
UNS — · As-cast, slow-cooled and stress-relieved; both faces precision-milled at the mill (essentially zero residual stress)
Stress-free cast aluminum jig & tooling plate. Prized for flatness and dimensional stability, not strength.
Chemical composition
Nominal % by weight.
| Element | % by wt |
|---|---|
| Al | Bal. |
| Si | 0.4–0.7 |
| Fe | ≤0.30 |
| Cu | ≤0.25 |
| Mn | ≤0.10 |
| Mg | ≤0.10 |
| Zn | ≤0.10 |
| Ti | ≤0.06 |
Applicable specifications
AMS / ASTM / MIL.
- Alcoa MIC-6 (proprietary cast mold/tool plate)
- No AMS/ASTM wrought-plate equivalent — purchased to mill datasheet
Machining guidance
CNC parameters and tooling.
Polished carbide, 35° helix end mills; PCD for high volume
Machines like 6061 (~90/100) with negligible distortion — stress-free cast structure stays put. Watch for occasional casting porosity that can surface as pinholes; not for vacuum/pressure-tight parts. Strength is modest (24 ksi UTS, far below 6061-T6) — spec it for dimensional stability, not load.
Stock & cost
Forms and Q1 2026 pricing.
- As-machined (typical)
- Bead blast (matte)
- Anodize — special procedures required; coordinated outside
Typical applications
Where MIC-6 is the right pick.
- Optical mounts
- Metrology & inspection fixtures
- Vacuum-chamber fixturing (not sealing surfaces)
- Jigs & base plates
- Semiconductor tooling
Alternative materials
Substitute or upgrade options.
- ATP-5 (tighter as-shipped flatness, porosity-free)
- 6061-T651 (cheaper, much stronger, less stable)
- 7075-T7351 (stretch-relieved wrought, high strength)
Digital Machine · Quick-Turn CNC · California
Machine your part in MIC-6.
Production CNC milling and turning. Confirm material, inspection and documentation requirements when requesting a quote.
Keep exploring
Related tools & references
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How it stacks up against its alternatives.
Aerospace specs that call out this alloy.