Key facts
Where to buy| Property | Value | Source |
|---|---|---|
| Density | 0.095 lb/in³ (2.64 g/cm³) | Teal Sheets |
| Rivet shear, driven 5056-H321 | 28 ksi | MIL-HDBK-5J Table 8.1.2(b) |
| Rivet shear, undriven 5056-H32 | 24 ksi | MIL-HDBK-5J Table 8.1.2(b) |
| Rivet code and head | B, raised cross | AC 43.13-1B Table 4-8 |
MIL-HDBK-5J has no bulk allowables table for 5056: it appears as a rivet material in Chapter 8.
Reading the alloy and temper code
Composition limits, weight percent
| Element | Limit |
|---|---|
| Si | 0.30 |
| Fe | 0.40 |
| Cu | 0.10 |
| Mn | 0.05–0.20 |
| Mg | 4.5–5.6 |
| Cr | 0.05–0.20 |
| Zn | 0.10 |
| Al | Remainder |
A single number is a maximum. Other elements: 0.05 each, 0.15 total, except where the Teal Sheets say otherwise. Source: Aluminum Association Teal Sheets (Aug 2018).
Where it is used
When riveting magnesium alloy structures, 5056 rivets are used exclusively, for their corrosion resistance in that combination (AC par. 7-2d).
The AMT Handbook adds cable sheathing, and any application where aluminum touches magnesium alloys (p. 4-30).
Questions people actually ask
Can I use an AD rivet in magnesium?
The AC says 5056 exclusively. See also the galvanic corrosion calculator.
Limits — when NOT to use this
- Not a source of design allowables. Values are for reference. MMPDS and the SRM govern a repair.
- Not a substitution approval. A different alloy or temper needs approved data.
Where to buy
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Sources
- FAA AC 43.13-1B CHG 1, Chapters 4 and 7 — Table 4-8; par. 7-2.
- FAA-H-8083-31B, AMT Handbook — Airframe, Volume 1, Chapter 4 — p. 4-30.
- MIL-HDBK-5J (31 Jan 2003), Chapter 3 — Table 8.1.2(b). Cancelled and superseded by MMPDS: check current MMPDS before design use.
- Aluminum Association, International Alloy Designations (Teal Sheets), rev. Aug 2018 — chemical composition limits and nominal densities.
- MMPDS (formerly MIL-HDBK-5) — the current home of design allowables. A repair substantiation cites MMPDS or the SRM, not a website.
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.