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AMS 5732 — A286 Bar, Forging and Tubing Solution-Treated and Aged
AMS 5732 is the SAE Aerospace Material Specification covering A286 (UNS S66286) bar, forging, and tubing in solution-treated and precipitation-aged condition — sol 1650 °F + aged 1325 °F × 16 hours. The most common mill-aged aerospace A286 bar specification — material ships ready for use without further heat-treatment. Used directly for fastener cold-heading, aerospace machining, and downstream component manufacture. Distinguished from AMS 5731 (sol-treated only) by aging condition: AMS 5732 ships aged; AMS 5731 ships sol-treated for downstream aging. See parent A286 AMS specifications hub, related A286 round bar, hex bar, forged bar, sister spec AMS 5737 (precision aged).
Spec Scope & Coverage
AMS 5732 covers A286 bar, forging, and tubing in solution-treated and precipitation-aged condition. Material is VIM-VAR melted, hot-worked to the required form, solution-treated 1650 °F (899 °C) and oil-quenched, then precipitation-aged 1325 °F (718 °C) for 16 hours and air-cooled. Final hardness 29-32 HRC; tensile ≥ 895 MPa (130 ksi); yield ≥ 655 MPa (95 ksi). Bar tolerance per AMS 5732 dimensional table. Used directly for: cold-heading into A286 hex bolts, SHCS, NAS bolts; downstream machining of complex components; rotating shaft manufacture.
A286 Chemical Composition (UNS S66286)
| Element | Min % | Max % | Notes |
|---|---|---|---|
| Iron (Fe) | Balance | Balance | ~53 % typical |
| Nickel (Ni) | 24.0 | 27.0 | Solid-solution stabilizer |
| Chromium (Cr) | 13.5 | 16.0 | Corrosion + oxidation resistance |
| Titanium (Ti) | 1.90 | 2.35 | Gamma-prime former (Ni3Ti) |
| Molybdenum (Mo) | 1.00 | 1.50 | Solid-solution strengthener |
| Vanadium (V) | 0.10 | 0.50 | Carbide stabilizer |
| Aluminium (Al) | 0 | 0.35 | Gamma-prime former (Ni3Al) |
| Boron (B) | 0.001 | 0.010 | Grain-boundary strengthening |
| Carbon (C) | 0 | 0.08 | Per ASTM A453 |
| Manganese (Mn) | 0 | 2.00 | Per ASTM A453 |
| Silicon (Si) | 0 | 1.00 | Per ASTM A453 |
| Phosphorus (P) | 0 | 0.025 | Trace impurity |
| Sulphur (S) | 0 | 0.015 | Trace impurity |
AMS 5732 — A286 Bar, Forging and Tubing Solution-Treated and Aged — Spec Requirements
| Property | AMS 5732 requirement | Notes |
|---|---|---|
| Form | Bar, forging, tubing | Aerospace standard form coverage |
| Solution treatment | 1650 °F (899 °C) + oil-quench | Lower-temperature sol |
| Aging | 1325 °F (718 °C) × 16 hours, air-cool | Standard A286 aging |
| Tensile strength | ≥ 895 MPa (130 ksi) | Mill-aged condition |
| Yield strength (0.2 %) | ≥ 655 MPa (95 ksi) | Mill-aged condition |
| Elongation | ≥ 15 % | In 50 mm gauge length |
| Reduction of area | ≥ 18 % | Cross-section reduction |
| Hardness | 29-32 HRC | Aged condition target |
| Magnetic permeability | < 1.005 | Per ASTM A342 |
When to Specify AMS 5732 — A286 Bar, Forging and Tubing Solution-Treated and Aged
- Aerospace fastener cold-heading: AMS 5732 is the dominant feed for cold-heading A286 hex bolts, SHCS, NAS bolts. Material ships aged and ready.
- Aerospace shaft machining: AMS 5732 bar machined directly to shaft components — dimensional stability assured by post-aging shrinkage being already accounted for in mill-aged condition.
- Aerospace forgings (alternate to A638): AMS 5732 forgings in lieu of ASTM A638 grade 660 for non-pressure-bearing aerospace forgings.
- Tubing for high-temperature service: AMS 5732 tubing for jet-engine bleed-air and gas-turbine combustor manifold applications.
- Sol-treated alternative: For sol-treated bar (downstream user ages), specify AMS 5731.
- Precision-aged variant: For precision aged bar with tighter heat-treatment + hardness window, specify AMS 5737.
AMS 5732 — A286 Bar, Forging and Tubing Solution-Treated and Aged — Frequently Asked Questions
What is AMS 5732?
SAE / AMS spec covering A286 (UNS S66286) bar, forging, and tubing in solution-treated (1650 °F) and precipitation-aged (1325 °F × 16 h) condition. The most common mill-aged aerospace A286 bar spec — ships ready for use.
AMS 5732 vs AMS 5731 — which to specify?
AMS 5732: sol-treated AND aged from mill, ready for use, hardness 29-32 HRC. AMS 5731: sol-treated only, soft (24-28 HRC), customer ages downstream. Choose AMS 5732 for direct use; AMS 5731 when aging timing matters.
AMS 5732 vs AMS 5737 — what's the difference?
Both sol-treated and aged. AMS 5737 has tighter heat-treatment temperature control (±5 °C) and tighter dimensional tolerance — used for precision applications and cold-headed fasteners requiring close hardness uniformity. AMS 5732 is more general aerospace spec.
What sol-treatment temperature for AMS 5732?
1650 °F (899 °C) for 1 hour per inch of section, oil-quench. Lower than AMS 5731 (1800 °F) — AMS 5732 sol-treatment provides higher room-temperature tensile and yield at the cost of slightly lower stress-rupture strength.
What hardness should AMS 5732 bar have?
29-32 HRC (277-302 HBW) after mill aging. Hardness traverse on each heat-treat batch verified per ASTM E384.
Is AMS 5732 the same as ASTM A453 grade 660 Class A?
Heat-treatment is essentially identical (sol 1650 °F + aged 1325 °F). Chemistry is identical (UNS S66286). Difference is scope — AMS 5732 is aerospace bar/forging/tubing under AS9100D AQMS; ASTM A453 grade 660 Class A is industrial bolting. For aerospace, AMS 5732 cited; for industrial, ASTM A453.
What's the lead time on AMS 5732 bar?
Standard sizes 5-50 mm: 4-6 weeks from heat release. Larger sizes 50-200 mm: 6-10 weeks. Aerospace AS9102 first-article: add 1-2 weeks.
Is AMS 5732 magnetic?
No. Magnetic permeability < 1.005 verified per ASTM A342 on every aerospace heat. Critical for non-magnetic instrumentation and aerospace electromagnetic-sensitive applications.
Can AMS 5732 be welded?
Yes — TIG / GTAW with matching A286 welding rod (AMS 5853). Pre-heat NOT required for thicknesses ≤ 50 mm. Post-weld solution-treatment + aging required for full-strength weld zone.
Mechanical Properties per This Spec
| Property | Min value (mill-aged) | Notes |
|---|---|---|
| Tensile strength (MPa) | ≥ 895 | Mill-aged condition |
| Yield strength 0.2 % (MPa) | ≥ 655 | Mill-aged |
| Elongation (%) | ≥ 15 | In 50 mm gauge |
| Hardness HRC | 29-32 | Aged target |
A286 Products Manufactured per This Spec
TorqBolt manufactures the following A286 products to this specification:
- A286 Round Bar
- A286 Hex Bolts
- A286 Socket Head Cap Screws
- A286 NAS Bolts
- A286 CRES Bolts
- A286 Stud Bolts
- A286 Forgings
Mating & Related Specifications
Common mating and related A286 specifications used alongside this spec:
- AMS 5731 — Sol-treated only variant — customer ages downstream.
- AMS 5737 — Precision-aged variant with tighter tolerance.
- ASTM A453 grade 660 Class A — Industrial bolting equivalent.
Drawing Call-Out Example
A286 bar, AMS 5732, sol-treated and aged, ⌀ 16.0 mm × 3000 mm length, cold-drawn pickled, ±0.05 mm OD, EN 10204 3.1.
Related A286 Specifications & Reference
Other A286 specifications: AMS / ASTM hub · AMS 5525 · AMS 5731 · AMS 5732 · AMS 5737 · AMS 5853 · AMS 5895 · ASTM A453 grade 660 · ASTM A638 grade 660 · ASTM B637 · DIN 1.4980 · UNS S66286.
Canonical A286 reference: A286 chemical composition · A286 mechanical properties · A286 heat treatment · alloy comparisons (vs Inconel 718 · vs Waspaloy).
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