AMS 5737 - A286 (UNS S66286) Bars, Wire, Forgings & Tubing (Solution Heat Treated)
What is AMS 5737?
AMS 5737 is the SAE International aerospace material specification for A286 (UNS S66286), an austenitic precipitation-hardenable iron-nickel-chromium superalloy with additions of molybdenum, titanium, aluminum, boron, and vanadium, supplied in the forms of bars, wire, forgings, and tubing in the solution heat treated condition.
The nominal composition is 26Ni-15Cr-1.25Mo-2.15Ti-0.20V-0.20Al-0.05C-0.006B (Fe balance).
AMS 5737 has the broadest standard product form coverage in the A286 solution heat treated specification family: it is the only A286 SHT specification covering bars, wire, forgings, and tubing without a consumable electrode melt requirement.
AMS 5726 and AMS 5895 also cover broader forms but explicitly require consumable electrode melting; AMS 5731, AMS 5732, and AMS 5734 cover bars and forgings only.
AMS 5737 is therefore the preferred procurement specification when the OEM drawing calls for A286 in bar, wire, forging, or tubing form in the solution heat treated condition, without a specific melt practice requirement.
In the solution heat treated condition per AMS 5737, A286 achieves a minimum tensile strength of 130 ksi (896 MPa) and a minimum yield strength of 85 ksi (586 MPa) for bar product forms.
A286 per AMS 5737 maintains strength and oxidation resistance at temperatures up to 1,300°F (704°C), and retains its non-magnetic, austenitic structure down to cryogenic temperatures of −320°F (−196°C).
AMS 5737 Available Forms and Stocked Sizes
A286 round bar per AMS 5737 in the solution heat treated condition; stocked in diameters from 0.1875″ (4.76 mm) to over 14.000″ (355.6 mm) in standard mill lengths; saw-cut to customer-specified length available.
A286 flat bar, hex bar, and shaped bar per AMS 5737 in the solution heat treated condition; flat bar widths from approximately 0.500″ (12.70 mm) to over 12.000″ (304.8 mm) with standard thicknesses; hexagon bar across-flats from approximately 0.500″ to 4.000″; custom profiles available.
A286 near-net-shape forgings per AMS 5737 in the solution heat treated condition; produced per customer print and tolerances with optimized grain flow for the finished part cross-section; full CMTR including solution heat treatment records, chemistry, and mechanical test data supplied with each lot.
A286 wire per AMS 5737 in the solution heat treated condition; typical diameter range from approximately 0.020″ (0.50 mm) to 0.500″ (12.70 mm); available in coil or straightened-and-cut lengths; verify specific diameter and coil size availability to order.
A286 seamless tubing per AMS 5737 in the solution heat treated condition; standard aerospace OD sizes from approximately 0.250″ (6.35 mm) to 4.000″ (101.6 mm) OD with standard wall thicknesses; verify OD, wall, and length availability to order.
Fighter Jet Metals supplies A286 per AMS 5737 in round bar, wire, flat bar, forging, and tubing forms in the solution heat treated condition.
All material is supplied with full certified mill test reports (CMTR) documenting solution heat treatment records, chemical analysis, and mechanical test certifications traceable to the originating mill heat.
Applications of AMS 5737
Aerospace & Gas Turbine Applications
- A286 round bar per AMS 5737 for jet engine fastener manufacturing – solution heat treated condition provides maximum machinability before thread rolling and precipitation aging to service strength for engine bolts, wheel studs, and case fasteners
- A286 wire per AMS 5737 in the solution heat treated condition for subsequent drawing and precision forming of aerospace fasteners, lock wire, and high-temperature wire-form hardware on programs where AMS 5737 wire is the OEM-specified procurement standard
- A286 forgings per AMS 5737 in the solution heat treated condition for turbine engine structural forgings, compressor disc forgings, and casing forgings requiring pre-machining before final precipitation aging to service properties
- A286 tubing per AMS 5737 in the solution heat treated condition for high-temperature hydraulic and pneumatic tubing assemblies, engine oil system tubing, fuel system components, and bleed air ducting requiring A286’s combination of strength, oxidation resistance, and non-magnetic properties at elevated temperatures
- Aircraft engine structural hardware requiring A286 in bar, wire, forging, or tubing form under a single AMS 5737 procurement specification – preferred when multiple product forms are required from the same specification on a single program
- High-temperature jet engine fasteners, compressor hardware, and engine structural components for turbofan, turbojet, turboprop, and turboshaft engines up to 1,300°F (704°C)
Industrial and Energy Applications
- Industrial gas turbine (IGT) fasteners, bolts, and structural hardware per AMS 5737 for land-based power generation applications
- A286 tubing per AMS 5737 for industrial heat exchanger tubing, process piping, and pressure vessel components requiring the combined strength, corrosion resistance, and elevated-temperature capability of A286
- Non-magnetic A286 hardware in bar, wire, forging, and tubing form per AMS 5737 for cryogenic applications down to −320°F (−196°C) – subsea, liquid gas handling, and low-temperature structural applications
- Industrial turbomachinery shafts, flanges, and fittings fabricated from AMS 5737 bar or forging in the solution heat treated condition for subsequent aging to service strength
Defense Applications
- Military aircraft engine fasteners, bolts, and structural hardware in bar form per AMS 5737 in the solution heat treated condition for programs requiring A286 bar supply to AMS 5737 traceability
- Defense turbine engine forgings and structural components per AMS 5737 requiring full AS9100D-traceable documentation for military aircraft, attack aircraft, and rotorcraft engine programs
- High-temperature tubing assemblies per AMS 5737 for military aircraft hydraulic, pneumatic, and fuel system components requiring A286’s non-magnetic, high-temperature performance in airframe and engine service
- A286 wire per AMS 5737 for military aerospace fastener manufacturing on programs where AMS 5737 wire is the specified procurement form
Chemical Composition - AMS 5737
The following chemical composition limits apply to A286 (UNS S66286) per AMS 5737:
| Element | Symbol | Minimum % | Maximum % |
|---|---|---|---|
| Iron | Fe | - | Balance |
| Nickel | Ni | 24.0 | 27.0 |
| Chromium | Cr | 13.5 | 16.0 |
| Boron | B | 0.003 | 0.010 |
| Molybdenum | Mo | 1.00 | 1.50 |
| Vanadium | V | 0.10 | 0.50 |
| Titanium | Ti | 1.90 | 2.35 |
| Aluminum | Al | - | 0.35 |
| Phosphorus | P | - | 0.030 |
| Carbon | C | - | 0.08 |
| Manganese | Mn | - | 2.00 |
| Silicon | Si | - | 1.00 |
| Copper | Cu | - | 0.50 |
| Sulfur | S | - | 0.020 |
Nickel (24.0–27.0%) is the primary matrix element that stabilizes the austenitic face-centered cubic crystal structure from cryogenic temperatures to the alloy’s service limit.
The high nickel content combined with chromium provides A286’s characteristic non-magnetic behavior, which is maintained across all four AMS 5737 product forms – bars, wire, forgings, and tubing – making A286 per AMS 5737 suitable for magnetic-sensitive applications at temperatures down to −320°F (−196°C).
Chromium (13.5–16.0%) provides oxidation resistance and hot corrosion resistance; the nominal 15% chromium level places AMS 5737 A286 in the corrosion-resistant alloy category without requiring coatings for most applications up to 1,300°F (704°C) in bars, forgings, and tubing service.
Molybdenum (1.00–1.50%) contributes solid-solution strengthening and improves pitting corrosion resistance, which is particularly relevant for A286 tubing and wire applications in corrosive service environments.
Titanium (1.90–2.35%) is the primary precipitation hardening element: in the SHT condition per AMS 5737, titanium is dissolved into solid solution to prepare all four product forms (bar, wire, forging, tubing) for subsequent customer precipitation aging (typically 1325°F / 718°C / 16 hours / air cool) to develop service-ready strength.
Vanadium (0.10–0.50%) improves notch sensitivity and fatigue resistance – important in AMS 5737 wire for fastener manufacturing and tubing for high-cycle pressure applications.
Boron (0.003–0.010%) and Aluminum (max 0.35%) strengthen grain boundaries and improve elevated-temperature stress rupture and creep resistance across all AMS 5737 product forms.
Iron is the balance element; the high iron content gives all AMS 5737 product forms a density of 0.286 lb/in³ (7.92 g/cm³) – considerably lighter than nickel-based superalloys, a weight advantage in structural tubing and fastener wire applications.
Mechanical Properties - AMS 5737
Minimum mechanical properties for A286 per AMS 5737 in the solution heat treated (SHT) condition (bar product forms):
| Property | Imperial | Metric |
|---|---|---|
| Tensile Strength (min) | 130,000 psi (130 ksi) | 896 MPa |
| Yield Strength, 0.2% offset (min) | 85,000 psi (85 ksi) | 586 MPa |
| Elongation in 2 in. or 4D (min) | 25% | 25% |
| Reduction in Area (min) | 25% | 25% |
Elevated Temperature Properties - AMS 5737
The following elevated temperature properties are for A286 (UNS S66286) in the precipitation aged condition after starting from the AMS 5737 solution heat treated condition.
These are representative typical values from published literature (Carpenter Technology / Special Metals Technical Data):
| Temperature | Tensile Strength (typical) | Yield Strength (typical) | Elongation (typical) |
|---|---|---|---|
| Room Temp (70°F / 21°C) | 145 ksi (1000 MPa) | 100 ksi (690 MPa) | 22% |
| 400°F (204°C) | 140 ksi (965 MPa) | 98 ksi (676 MPa) | 20% |
| 800°F (427°C) | 135 ksi (931 MPa) | 97 ksi (669 MPa) | 18% |
| 1000°F (538°C) | 130 ksi (896 MPa) | 93 ksi (641 MPa) | 17% |
| 1200°F (649°C) | 110 ksi (758 MPa) | 84 ksi (579 MPa) | 16% |
| 1300°F (704°C) | 82 ksi (565 MPa) | 64 ksi (441 MPa) | 18% |
Physical Properties - AMS 5737
| Property | Value (Imperial) | Value (Metric) |
|---|---|---|
| Density | 0.286 lb/in³ | 7.92 g/cm³ |
| Solidus Temperature | ~2500°F | ~1371°C |
| Liquidus Temperature | ~2540°F | ~1393°C |
| Modulus of Elasticity | 29.1 × 10⁶ psi | 201 GPa |
| Thermal Conductivity | 6.8 BTU/(hr·ft·°F) | 11.8 W/(m·K) |
| Thermal Conductivity (1200°F) | 9.2 BTU/(hr·ft·°F) | 15.9 W/(m·K) |
| Coefficient of Thermal Expansion | 9.2 × 10⁻⁶ /°F | 16.6 × 10⁻⁶ /°C |
| Specific Heat | 0.110 BTU/(lb·°F) | 460 J/(kg·K) |
| Max Service Temperature (Rotating Load) | 1300°F | 704°C |
| Max Service Temperature (Static / Structural) | 1500°F | 816°C |
| Solution Heat Treatment Temperature | 1800°F (980°C) / 1 hr min | - |
| Magnetic Permeability | Non-magnetic (austenitic) | - |
AMS 5737 vs AMS 5731 vs AMS 5895 - Which Specification Do You Need?
All three are SAE AMS specifications for A286 (UNS S66286) in the solution heat treated condition, but they differ fundamentally in product form coverage, melt practice requirements, and SHT temperature:
| Feature | AMS 5737 | AMS 5731 | AMS 5895 |
|---|---|---|---|
| Alloy | A286 (UNS S66286) | A286 (UNS S66286) | A286 (UNS S66286) |
| Product Forms | Bars, Wire, Forgings, Tubing | Bars, Forgings | Bars, Wire, Forgings, Tubing, Rings |
| Condition | Solution Heat Treated | Solution Heat Treated | Solution Heat Treated |
| Tensile Strength (min, bar SHT) | 130 ksi (896 MPa) | 130 ksi (896 MPa) | Per spec (consult current revision) |
| Yield Strength (min, bar SHT) | 85 ksi (586 MPa) | 85 ksi (586 MPa) | Per spec (consult current revision) |
| SHT Temperature | Per spec (consult current revision) | 1800°F (980°C) / 1 hr min | 1750°F (954°C) - explicitly stated |
| Wire Coverage | Yes | No | Yes |
| Tubing Coverage | Yes | No | Yes |
| Rings Coverage | No | No | Yes |
| Melt Practice | No consumable electrode requirement | No consumable electrode requirement | Consumable electrode required (VIM + VAR) |
| Key Characteristic | Broadest A286 SHT product form coverage without consumable electrode requirement - bars, wire, forgings, and tubing from a single specification; the preferred SHT specification for programs requiring A286 in wire or tubing form without specific melt practice traceability | Explicit 1800°F (980°C) SHT temperature - the most widely specified A286 SHT bars and forgings specification; bars and forgings only | Broadest A286 product form coverage overall including rings - but consumable electrode melt (VIM+VAR) required and documented on CMTR; SHT at 1750°F (954°C) |
| Typical Application | Engine hardware, fasteners, tubing assemblies, and wire where the OEM drawing specifies AMS 5737 or requires A286 in wire or tubing form in the SHT condition without consumable electrode melt traceability | Engine hardware, turbine fasteners, and structural forgings where the drawing requires bars and forgings at the standard 1800°F (980°C) SHT condition | High-temperature fasteners, rotating engine hardware, and forged rings requiring consumable electrode melt traceability across the full A286 product form range |
Specify AMS 5737 when the OEM engineering drawing calls for AMS 5737, or when A286 is required in bar, wire, forging, or tubing form in the SHT condition without a specific consumable electrode melt requirement.
Specify AMS 5731 when the drawing requires bars or forgings specifically with the 1800°F (980°C) SHT temperature.
Specify AMS 5895 when the drawing requires consumable electrode melt traceability documented on the CMTR for any product form including rings.
Always confirm the specification number on the engineering drawing – do not substitute AMS 5737 for AMS 5731, AMS 5895, or vice versa without written OEM engineering approval.
Approved Mill Producers
Fighter Jet Metals sources A286 per AMS 5737 bars, wire, forgings, and tubing from AS9100D-certified mill producers.
All material is supplied with full certified mill test reports (CMTR), heat/lot numbers, chemical analysis reports (spectrographic), and mechanical test certifications traceable to the originating mill heat and solution heat treatment documentation.
AMS 5737 Machining Guidelines
A286 per AMS 5737 is supplied in the solution heat treated condition, which provides the best machinability of any A286 delivery condition across all four product forms.
Bar and forging forms in the SHT condition have lower hardness, higher ductility, and reduced work-hardening tendency compared to cold-worked (AMS 5853) or aged condition material.
Key machining considerations for AMS 5737 bars and forgings in the solution heat treated condition:
- Work hardening: A286 in the SHT condition work-hardens more rapidly than standard austenitic stainless steels (304, 316). Continuous cutting with no dwell is required to prevent work-hardening ahead of the tool, which increases cutting force and accelerates tool wear
- Turning and boring: Positive-rake carbide tooling (C2 or C3 carbide, PVD TiAlN coated) recommended; rigid setup required to prevent chatter; cutting speeds of 100–200 SFM with high-pressure flood coolant
- Thread machining: Thread rolling is strongly preferred over thread cutting for AMS 5737 fastener manufacturing from bar – roll thread in the SHT condition, then precipitation age to produce specified tensile strength on the finished fastener
- Drilling: Cobalt HSS or solid carbide drills recommended for diameters above 0.25″; peck drilling with flood coolant for all hole depths
- Milling: Climbing (down) milling preferred to prevent work-hardening; positive-rake carbide endmills; maintain chip load to avoid rubbing at low feed rates
- Coolant: High-pressure flood coolant required at all times; sulfurized or chlorinated cutting oils for difficult features (deep holes, thread cutting)Chip control: A286 SHT produces long, stringy chips – chip breaker geometry essential in turning; built-up edge formation is the primary tool failure mode in A286
- Wire drawing considerations (AMS 5737 wire in SHT condition): AMS 5737 wire in the solution heat treated condition is the starting material for subsequent drawing to final diameter and precipitation aging. Standard reduction sequences and drawing die materials for austenitic iron-nickel-chromium alloys apply; confirm wire drawing parameters with the wire supplier.
- Tubing forming considerations (AMS 5737 tubing in SHT condition): AMS 5737 tubing in the SHT condition provides maximum formability for end-forming, flaring, swaging, and bending operations on aerospace tubing assemblies. After forming operations, precipitation age the assembled tubing subassembly to develop final service-ready strength before installation.
Weldability of AMS 5737
A286 per AMS 5737 is supplied in the solution heat treated (unaged) condition across all four product forms – bars, wire, forgings, and tubing are all weldable in the SHT delivery state.
Because the material has not been precipitation aged, the risk of strain-age cracking (SAC) in the heat-affected zone is significantly lower than for aged material.
- TIG (GTAW): Primary welding process for AMS 5737 A286 bars, forgings, and tubing in the SHT condition; minimum heat input; argon shielding gas; filler metal AMS 5798 (A286-type filler, ER CRNI-2 equivalent) recommended
- Electron Beam (EBW): Used in precision aerospace applications requiring minimal heat input and narrow heat-affected zone; performed in vacuum; applicable to AMS 5737 bar, forging, and tubing welds
- Orbital GTAW: Preferred process for AMS 5737 tubing-to-fitting joints; orbital welding provides consistent bead geometry and heat input control for aerospace tubing assemblies
- Preheat: Generally not required for thin sections; for thick bar or forging sections (>0.5″), a preheat of 200–300°F (93–149°C) and controlled interpass temperature reduces thermal gradient cracking risk
- Post-weld heat treatment (PWHT): For weldments requiring fully aged properties, a complete precipitation aging cycle (1325°F / 718°C / 16 hours minimum / air cool) is applied after welding and before final inspection
- Recommended fabrication sequence for AMS 5737 tubing assemblies: machine and form all features in SHT condition (AMS 5737) → orbital GTAW or GTAW weld tubing-to-fitting joints → inspect weld quality (RT/FPI) → precipitation age to service properties → pressure test and final inspect
- Contrast with aged material: A286 that has been precipitation aged has significantly higher SAC susceptibility. Weldment repair on aged A286 hardware requires careful procedure qualification and typically re-solution treatment before welding
Melt Practice - AMS 5737
AMS 5737 covers A286 (UNS S66286) bars, wire, forgings, and tubing in the solution heat treated condition.
AMS 5737 does not impose a consumable electrode melt requirement – this is a key distinction from AMS 5726 (bars and forgings, consumable electrode required) and AMS 5895 (bars, wire, forgings, tubing, and rings, consumable electrode required and SHT at 1750°F / 954°C).
Under AMS 5737, standard air melting practice or vacuum induction melting may be used; the applicable melt practice is per the requirements of the current revision of AMS 5737 and should be confirmed on the certified mill test report (CMTR) for each procurement.
AMS 5737 Product Form Scope – the Key Differentiator:
AMS 5737’s defining characteristic is its broadest standard product form coverage in the A286 SHT specification family without a consumable electrode requirement.
AMS 5737 Cross-Reference Specifications
SHEET & PLATE
A286 flat-rolled specifications covering sheet, strip, and plate product forms – the flat-product counterparts to AMS 5737 bars, wire, forgings, and tubing.
Bars, Wire, Forgings & Tubing
A286 bar, wire, forging, and tubing specifications in various heat treat conditions and melt practice requirements – the sibling specifications to AMS 5737 for different product form combinations, melt practice, or heat treatment parameters.
GE SPECIFICATIONS
GE Aviation quality and material procurement specifications covering A286 product forms used in GE-designed aircraft engine programs.
ROLLS ROYCE SPECIFICATIONS
Rolls-Royce material quality specifications for A286 product forms used in Rolls-Royce turbine and aircraft engine hardware.
PRATT & WHITNEY SPECIFICATIONS
Pratt & Whitney material procurement specification for A286 bars covering aircraft engine applications.
SAFRAN SPECIFICATIONS
Safran / CFM International material specification for A286 covering Safran-designed aerospace engine component programs.
Trade Names and Equivalent Designations
A286 per AMS 5737 is known by the following trade names and equivalent designations across different standards systems:
| Designation | System | Notes |
|---|---|---|
| A-286 / A286 | Common name | Widely used commercial designation; the hyphen is optional |
| Iron Alloy S66286 | Generic name | Generic iron-based superalloy designation for non-proprietary procurement |
| AISI 660 | AISI | designation sometimes used for A286 in commercial sourcing |
| ASTM A638 Gr. 660 | ASTM specification | Precipitation-hardening iron-base superalloy bars, forgings, and rings - includes UNS S66286 (Grade 660) |
| AMS 5734 | SAE AMS | Solution heat treated bars and forgings at 1650°F (900°C) |
| AMS 5737 | SAE AMS | Solution heat treated bars, wire, forgings, and tubing |
| AMS 5726 | SAE AMS | Solution heat treated bars and forgings |
| UNS S66286 | UNS (Unified Numbering System) | Standard material identifier in North America |
| DIN 1.4980 / W.Nr. 1.4980 | Werkstoff Nr. (German) | European material number designation |
| AMS 5731 | SAE AMS | Solution heat treated bars and forgings - 1800°F SHT, related specification |
| AMS 5732 | SAE AMS | Solution-strengthened bars and forgings |
| AMS 5525 | SAE AMS | Solution heat treated sheet, strip, and plate |
| AMS 5853 | SAE AMS | Cold-worked and work-strengthened bars and wire |
| AMS 5895 | SAE AMS | Solution heat treated bars, wire, forgings, tubing, rings - 1750°F SHT, consumable electrode |
Why Source AMS 5737 from Fighter Jet Metals?
Full mill certifications on every order
Heat number, lot number, chemical analysis, and mechanical test reports included with every shipment
Complete heat-lot traceability
Full chain-of-custody documentation from mill to your door
All four product forms under one roof
Bar, wire, forging, and tubing available per AMS 5737 from a single AS9100D-certified source; simplifies multi-form procurement on programs requiring A286 in multiple forms
AS9100D-certified aerospace sourcing
Material sourced from AS9100D-certified mills only
OEM specification support
Stock and supply to GE B50T1181C, B50T12, B50T81, MSRR 6531/6532/6688, PWA-S-5732, and DMD 0274-22 requirements in addition to AMS 5737 and related AMS 5525, 5726, 5731, 5732, 5734, 5853, 5858, and 5895 specifications
In-house processing
Bar saw cutting to length, trepanning (hollow bar), lathe work (turning), and shearing available for AMS 5737 bar stock; custom-cut sizes to your dimensions
Same-day quote response
Competitive pricing with rapid quote turnaround
Certified Material for Critical Service
Materials supplied in 6Al-4V titanium must meet strict aerospace certification and traceability requirements. Fighter Jet Metals supports sourcing across a wide range of AMS, MIL, and OEM specifications, ensuring compliance with industry standards.
All material is supplied with full mill certifications, complete heat-lot traceability, and detailed documentation. This ensures reliability and suitability for safety-critical aerospace, defense, and high-performance engineering applications.