Specifications
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
AMS 5737 — A286 Bar Solution-Treated and Aged Precision
AMS 5737 is the SAE Aerospace Material Specification covering A286 (UNS S66286) bar in precision solution-treated and precipitation-aged condition — sol 1650 °F + aged 1325 °F with tighter heat-treatment control and dimensional tolerance vs AMS 5732. The highest-volume aerospace bar specification — used as precision-aged feed for cold-heading aerospace fasteners (NAS / MS / Boeing-spec), and for high-tolerance machined-component manufacture. AMS 5737 search volume (390/mo US) is the highest of any A286 spec — engineers and procurement specifically reference AMS 5737 when ordering precision aerospace bar. Distinguished from AMS 5732 by tighter dimensional and heat-treatment tolerances. See parent A286 AMS specifications hub, related A286 round bar, cold-rolled bar.
Spec Scope & Coverage
AMS 5737 covers A286 bar in precision solution-treated and precipitation-aged condition. VIM-VAR melted, cold-drawn to precision OD tolerance (±0.025-0.05 mm), solution-treated 1650 °F + oil-quench, precipitation-aged 1325 °F × 16 hours + air-cool with ±5 °C temperature control. Final hardness 29-32 HRC with traverse uniformity required across the cross-section. Used as precision-aged feed for cold-heading A286 hex bolts, SHCS, NAS bolts, CRES bolts, and aerospace machined-component 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 5737 — A286 Bar Solution-Treated and Aged Precision — Spec Requirements
| Property | AMS 5737 requirement | Notes |
|---|---|---|
| Form | Bar (round, hex, square) | Cold-drawn precision |
| Solution treatment | 1650 °F (899 °C) + oil-quench | Same temperature as AMS 5732 |
| Aging | 1325 °F (718 °C) × 16 hours ±5 °C | Tighter temperature control vs AMS 5732 |
| OD tolerance | ±0.025-0.05 mm | Precision cold-drawn |
| Tensile strength | ≥ 895 MPa (130 ksi) | Aged condition |
| Yield strength (0.2 %) | ≥ 655 MPa (95 ksi) | Aged condition |
| Hardness | 29-32 HRC | Tight uniformity |
| Surface finish | Cold-drawn pickled, Ra ≤ 1.5 µm | Aerospace precision |
| Magnetic permeability | < 1.005 | Per ASTM A342 |
When to Specify AMS 5737 — A286 Bar Solution-Treated and Aged Precision
- Aerospace SHCS cold-heading: AMS 5737 precision bar is the dominant feed for A286 socket head cap screws per NAS 1351 / NAS 6203. Tight hardness uniformity ensures consistent cold-heading force.
- Aerospace 12-point bolt machining: AMS 5737 bar machined to A286 NAS 6603-6620 12-point bolt geometry — precision dimensional tolerance critical for aerospace fastener acceptance.
- Aerospace shaft + machined component: AMS 5737 bar for engine accessory drive shafts, pivot pins, machined housings requiring close OD tolerance (±0.025 mm).
- NACE MR0175 sour-service: AMS 5737 with hardness ≤ HRC 35 verified by Vickers traverse — sour-service compliant.
- Standard aerospace bar alternative: For less-critical aerospace lots, AMS 5732 at slightly looser tolerance is acceptable.
- Industrial bar substitute: ASTM B637 for non-aerospace industrial applications.
AMS 5737 — A286 Bar Solution-Treated and Aged Precision — Frequently Asked Questions
What is AMS 5737?
SAE / AMS spec covering A286 (UNS S66286) bar in precision solution-treated and precipitation-aged condition — the highest-volume aerospace bar spec for cold-headed fastener manufacture. Tighter heat-treatment and dimensional tolerance vs AMS 5732.
Why is AMS 5737 the highest-volume A286 spec?
Because aerospace SHCS (A286 socket head cap screws) are the highest-volume aerospace fasteners, and they're cold-headed from AMS 5737 precision bar. Search volume 390/mo US — engineers, procurement, and material specs all reference AMS 5737.
AMS 5737 vs AMS 5732 — which to specify?
AMS 5737: precision aged bar (±0.025-0.05 mm OD, ±5 °C aging temperature, tight hardness uniformity). AMS 5732: standard aged bar/forging/tubing. Choose AMS 5737 for precision aerospace cold-heading and machined components; AMS 5732 for general aerospace use.
AMS 5737 vs AMS 5731 — what's the difference?
AMS 5737: sol-treated AND aged precision bar, ready for use. AMS 5731: sol-treated only, customer ages downstream. AMS 5737 ships aged at hardness 29-32 HRC; AMS 5731 ships soft for downstream aging.
What's the OD tolerance on AMS 5737 bar?
±0.025-0.05 mm depending on diameter range — ±0.025 mm for sizes ≤ 12 mm, ±0.05 mm for 12-50 mm. Cold-drawn precision tolerance suited to cold-heading and precision machining without finish-grinding.
Is AMS 5737 the same as cold-drawn AMS 5732?
Similar but AMS 5737 has additional precision requirements: tighter hardness uniformity across cross-section (Δ ≤ 2 HRC), tighter dimensional tolerance, and ±5 °C aging temperature control. AMS 5737 explicitly cited on aerospace cold-heading drawings.
What's the lead time on AMS 5737 cold-drawn bar?
Standard sizes 5-50 mm: 4-6 weeks from heat release. Aerospace AS9102 first-article: add 1-2 weeks. Custom sizes 50-100 mm: 6-10 weeks.
Is AMS 5737 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 5737 be NACE MR0175 sour-service compliant?
Yes — when supplied with hardness ≤ HRC 35 (HV ≤ 327) per NACE MR0175 / ISO 15156-3. Each heat receives Vickers traverse before release for sour-service applications.
Mechanical Properties per This Spec
| Property | Min value (precision-aged) | Notes |
|---|---|---|
| Tensile strength (MPa) | ≥ 895 | Precision-aged |
| Yield strength 0.2 % (MPa) | ≥ 655 | Precision-aged |
| Elongation (%) | ≥ 15 | In 50 mm gauge |
| Hardness HRC | 29-32 | Δ ≤ 2 HRC across cross-section |
A286 Products Manufactured per This Spec
TorqBolt manufactures the following A286 products to this specification:
- A286 Cold-Rolled Bar
- A286 Hex Bolts
- A286 Socket Head Cap Screws
- A286 NAS Bolts
- A286 CRES Bolts
- A286 Cap Screws
- A286 Set Screws
Mating & Related Specifications
Common mating and related A286 specifications used alongside this spec:
- AMS 5732 — Standard aged bar — for less-precision applications.
- AMS 5731 — Sol-treated only — customer ages downstream.
- ASTM A453 grade 660 Class A — Industrial bolting equivalent.
Drawing Call-Out Example
A286 precision bar, AMS 5737, sol-treated and aged, ⌀ 12.0 mm × 3000 mm length, cold-drawn finish, ±0.05 mm OD tolerance, hardness uniformity Δ ≤ 2 HRC, 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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