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 is the most-cited A286 bar spec for aerospace cold-heading feedstock. 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.
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. Aerospace specifiers most often reference AMS 5737, 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.
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 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.
