A286 12 Point Screws
RAYCHIN SPECIALTY METALS FASTENERS: BOLTS, NUTS, SCREWS, WASHERS, STUDS, THREADED RODS, U-BOLT, J-BOLTS
STANDARD AND CUSTOMIZED, SMALL BATCH AND LARGE BATCH, IMPERIAL AND METRIC
A286 / Alloy 660 for excellent high temperature oxidation resistance
Excellent high temperature oxidation resistance to 1300°F / 700°C
Maintains high strength at elevated temperatures
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RAYCHIN LIMITED
Specialist in A286 12 Point Screws · Aerospace · External Wrenching · CustomA286 12 Point Screws: Aerospace 12-Point Flange Screws, External Wrenching & Custom Configurations
RAYCHIN LIMITED is a recognized expert in A286 12 point screws — from A286 aerospace 12-point flange screws, A286 external wrenching screws, A286 12-spline flange screws to custom non-standard 12 point screw configurations. A286 (UNS S66286) is an iron-nickel-chromium superalloy strengthened by precipitation hardening. Also designated as Alloy 660, it maintains exceptional strength and oxidation resistance up to 700°C (1292°F), making it the preferred material for high-temperature 12 point screw applications in gas turbines, jet engines, and aerospace assemblies. The 12-point drive allows for higher torques than hex heads while maintaining a compact envelope, and the integrated flange helps distribute the load. Our portfolio includes 12 point screws manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS standards. Engineered for extreme environments where exceptional high-temperature strength, corrosion resistance, and high torque capacity are critical. A286 12 point screws are available in solution annealed and aged conditions with precision rolled threads and full traceability.
Complete Range of A286 12 Point Screws
Aerospace 12-Point Flange Screws (NAS 870 Series)
A286 aerospace 12-point flange screws manufactured to NAS 870, NAS 871, NAS 872, and NAS 873 specifications. Designed for high-temperature aerospace and industrial applications requiring high preload and vibration resistance. The 12-point drive provides superior torque transmission while the integrated flange provides an enlarged bearing surface. Available in diameters from #10 to 1" (M5 to M24) with UNJF-3A and MJ threads. Shot peened per aerospace requirements and available with silver plating for anti-galling. Exceptional high-temperature strength up to 700°C makes these ideal for gas turbine engines, exhaust systems, and high-performance aircraft structures.
External Wrenching 12 Point Screws (MS 90353 Series)
A286 external wrenching 12 point screws for applications requiring high torque capacity in high-temperature environments. Manufactured to MS 90353, MS 90354, and MS 90355 specifications. The 12-point drive allows for higher torques than hex heads while maintaining a compact envelope. The lack of recess prevents fluid or debris entrapment, making these ideal for aerospace and gas turbine applications. Ideal for confined spaces in jet engines, turbine casings, and high-temperature processing equipment where oxidation resistance is critical.
12-Spline Flange Screws (AS 7452 Series)
A286 12-spline flange screws with integrated flange for bearing surface and 12-spline drive for positive engagement. Manufactured to AS 7452, AS 7453, and AS 7454 specifications. Used extensively in aerospace structural applications, gas turbine components, and high-temperature equipment. Available in various grip lengths and thread sizes with full traceability. The 24-27% nickel content ensures exceptional high-temperature strength and oxidation resistance up to 700°C.
NAS 624 Series 12 Point Screws
A286 NAS 624 12 point screws manufactured to NAS 624, NAS 625, NAS 626, and NAS 627 specifications. These external wrenching screws feature 12-point heads for high-torque applications in high-temperature environments. Available with UNJF-3A threads per MIL-S-8879 for enhanced fatigue life. Full traceability with material certification and third-party testing available. Ideal for gas turbine components, exhaust systems, and high-temperature structural applications requiring superior strength up to 700°C.
MS 90723 12 Point Screws
A286 MS 12 point screws manufactured to MS 90723 and other MS specifications. Used in military and aerospace applications where high-temperature resistance and reliability are paramount. Available with silver or cadmium plating options per customer requirements. Full traceability and NACE MR0175 compliance available. Ideal for engine mounts, exhaust components, and high-temperature structural assemblies in defense and aerospace platforms.
Custom & Specialty A286 12 Point Screws
Need a special head configuration, unusual grip length, or custom thread combination for your high-temperature application? RAYCHIN engineers work with you to produce custom A286 12 point screws to your drawing. Expert heat treatment (solution annealed at 982°C followed by precipitation hardening at 718°C for 16 hours) precisely controlled for each batch. Manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS standards. Precision ground threads and shot peening available.
The 12-Point Drive Advantage for A286 Screws
Higher Torque Capacity
The 12-point drive allows for up to 20% more torque transmission than hex heads of the same size, critical for high-temperature bolting applications requiring maximum preload.
Compact Envelope
12-point heads are generally smaller than hex heads, requiring less wrenching clearance and making them ideal for confined spaces in turbine engines and aerospace structures.
No Recess to Trap Debris
Unlike socket drives, the 12-point external drive has no recess to trap fluid or debris, making it ideal for high-temperature applications where cleanliness is important.
Integrated Flange
The built-in flange helps distribute the load, eliminating the need for separate washers and providing consistent bearing surface in critical high-temperature applications.
Manufacturing Standards for A286 12 Point Screws
RAYCHIN LIMITED manufactures A286 12 point screws to the following national and international standards, ensuring full compliance for projects worldwide. Both standard and non-standard custom configurations are available.
International Standards & Global Designations for A286 12 Point Screws
To serve clients worldwide, RAYCHIN LIMITED manufactures A286 12 point screws from material conforming to the following national and international specifications. This ensures full compliance for projects in the Americas, Europe, Asia, and the Middle East.
UNS S66286 Alloy 660 ASTM A453 AMS 5732 AMS 5737 NACE MR0175 1.4980 NAS 870 MS 90353
Chemical Composition (Weight %) – A286 Superalloy (UNS S66286 / 1.4980)
Our A286 12 point screws are produced from melts that strictly conform to the limits below per ASTM A453 / AMS 5731. The high nickel and chromium content provide excellent oxidation resistance, while titanium and aluminum enable precipitation hardening through gamma-prime (γ') phase formation. Molybdenum and vanadium contribute to solid solution strengthening, and boron enhances creep resistance.
Expert note: The combination of titanium and aluminum promotes the formation of Ni₃(Al,Ti) gamma-prime precipitates during aging, which provide A286 with its exceptional high-temperature strength. The addition of boron (0.001-0.010%) significantly improves creep resistance by strengthening grain boundaries. With nickel content of 24-27%, A286 offers excellent resistance to chloride stress corrosion cracking and maintains a stable austenitic structure from cryogenic temperatures up to 700°C.
Complete Mechanical Properties of A286 12 Point Screws (per ASTM A453)
A286 12 point screws are supplied in the solution annealed and precipitation hardened condition (982°C solution treat + 718°C age for 16 hours). ASTM A453 defines multiple classes for different strength levels and size ranges. The data below represent minimum requirements per ASTM A453/A453M. Screws are proof load tested to ensure compatibility with mating nuts.
Tensile Requirements by Class – ASTM A453 Grade 660
Hardness Requirements
Stress Rupture Properties (650°C / 1200°F)
A critical requirement for high-temperature fasteners is stress rupture resistance. Per ASTM A453, Class A, B, and C materials must meet the following:
Research confirms that A286 maintains anti-tensile strength not less than 885 MPa at 500°C with stress retention greater than 88.35%, making it the optimal choice for high-temperature fastener applications.
Temperature-Dependent Yield Strength
The following table shows typical yield strength (0.2% offset) at elevated temperatures for A286 in the fully heat-treated condition.
At 500°C, A286 maintains excellent stress retention, with studies showing stress retention rates exceeding 88.35% at this temperature.
Thermal Expansion Advantage of A286 12 Point Screws
A286 is specifically designed for bolting austenitic stainless steel flanges and components operating at elevated temperatures. Its thermal expansion coefficient closely matches that of 304/316 stainless steels, preventing loss of preload during thermal cycling – a critical feature for 12 point screws used in high-temperature flange connections and structural assemblies.
This expansion match is critical for maintaining preload and sealing in high-temperature applications such as turbine casings, exhaust systems, and heat treatment fixtures. Standard alloy steel fasteners expand less than the surrounding components, leading to loosening and potential failure. A286 eliminates this mismatch.
API 6A & NACE MR0175 Compliance
A286 12 point screws are widely used in oil and gas applications requiring sour service resistance. Per API 6A and API 20F, A286 Grade 660 Class D is approved for H₂S service with maximum hardness of 35 HRC.
Heat Treatment & Microstructural Stability
Optimal mechanical properties in A286 12 point screws are achieved through a two-step heat treatment:
- Solution Annealing: 980°C (1800°F) for 1 hour, oil quench or water quench. This dissolves carbides and prepares the matrix for precipitation hardening.
- Aging (Precipitation Hardening): 718°C (1325°F) for 16 hours, air cool. This forms coherent γ' (gamma-prime) precipitates [Ni₃(Al,Ti)] that provide high-temperature strength.
Metallurgical studies show that aging at 730°C accelerates precipitation kinetics but can lead to overaging and formation of η (eta) phase (Ni₃Ti), which degrades mechanical properties. Our controlled aging at 718°C ensures optimal γ' formation while avoiding η phase precipitation, maximizing creep resistance and long-term stability up to 700°C.
Physical Properties of A286
Corrosion Resistance of A286 12 Point Screws
While A286 is primarily selected for high-temperature strength, it also offers good corrosion resistance in many environments due to its high chromium (14-16%) and nickel (24-27%) content. The alloy exhibits excellent oxidation resistance up to 700°C continuous service and 815°C intermittent service.
Oxidation and Scaling Resistance
The chromium content provides excellent resistance to oxidation and scaling. A286 12 point screws form a protective Cr₂O₃ scale that prevents further oxidation at elevated temperatures. They provide excellent oxidation resistance up to 1500°F (815°C) in conditions typically found in gas turbine exhaust streams.
Corrosion in Other Environments
Critical Corrosion Considerations for 12 Point Screws
- Oxidation Resistance: Excellent oxidation resistance up to 1500°F (815°C) in gas turbine and exhaust environments.
- NACE MR0175 Compliance: A286 is qualified for sour service (sulfide stress cracking resistance) in oilfield equipment per NACE MR0175/ISO 15156. Class D with maximum hardness 35 HRC is preferred for sour applications.
- Temperature Limitations: Maximum service temperature for continuous service is 700°C (1300°F). For intermittent service, temperatures up to 815°C are acceptable.
- Galvanic Corrosion: When paired with lower-grade materials, galvanic corrosion should be considered. A286 is cathodic to most stainless steels but compatible with nickel-based alloys.
- Non-Magnetic Property: A286 is essentially non-magnetic, making it suitable for applications requiring non-magnetic fasteners such as MRI equipment and sensitive instrumentation.
- 12-Point Design Advantage: The external wrenching design prevents fluid entrapment, reducing the risk of corrosion in high-temperature applications.
High-Temperature Engineering Note: For critical applications in aggressive environments, RAYCHIN LIMITED can provide passivation, specialized coatings (Xylan, PTFE, silver plating per AMS 2410), or recommend optimal heat treatment conditions. Third-party corrosion testing per ASTM G31, G48, or G61 available upon request. NACE MR0175 compliant A286 12 point screws available in Class D condition with certified hardness ≤ 35 HRC. A286 offers a cost-effective balance of high-temperature strength and corrosion resistance – approximately 60-70% the cost of nickel-based alloys like Inconel 718.
Special focus: A286 12 Point Screws for Aerospace, Power Generation & Oil & Gas
For critical applications requiring high torque capacity and high-temperature strength, RAYCHIN offers A286 12 point screws manufactured to NAS, MS, AS, and customer-specific specifications. Our capabilities include:
- Aerospace Applications: Gas turbine engines, jet engine nacelles, exhaust systems, thrust reverser mechanisms, control systems, airframe structures, engine mounts. Meets NAS 870-873, NAS 624-627, MS 90353-90355, AS 7452-7454, MS 90723 specifications.
- Gas Turbines & Power Generation: Turbine casing bolting, combustion chamber supports, heat exchanger connections, steam turbine components, HRSG systems, generator assemblies, flue gas systems.
- Oil & Gas: Offshore platform equipment, subsea assemblies, wellhead components, refinery valve bonnets, sour service per NACE MR0175, high-temperature piping supports, API 6A closure bolting.
- Chemical Processing: High-temperature reactors, reformers, crackers, heat exchanger connections, furnace components, thermowell assemblies.
- Automotive: Turbocharger components, exhaust manifold fasteners, high-performance racing applications.
- Heat Treating: Fixture assemblies, tray connections, furnace hardware requiring oxidation resistance up to 700°C.
- Aerospace Standards: NAS 870-873, NAS 624-627, MS 90353-90355, AS 7452-7454, MS 90723
- Thread Specifications: UNJF-3A per MIL-S-8879, metric MJ threads, standard UNRC/UNRF and metric coarse/fine – all classes up to 3A/6g
- Surface Treatments: Silver plating per AMS 2410, cadmium plating per AMS 2400, passivation per AMS 2700, PTFE coating, Xylan
- Special Processing: Shot peening, magnetic particle inspection (MPI), fluorescent penetrant inspection, ultrasonic inspection
- Class Selection: Class A (standard strength), Class B, Class D (higher yield strength, API sour service), Cold Worked (maximum strength)
- Custom: Special grip lengths, head configurations, and unique thread combinations per customer drawings
All A286 12 point screws are supplied with full traceability and third-party NDT upon request. Sizes available from #10 to 1" (M5 to M24) in all standard configurations. Material certifications (EN 10204 3.1/3.2) included.
Why RAYCHIN LIMITED – The A286 12 Point Screw Authority
Metallurgical competence
Engineers on staff with deep expertise in precipitation hardening superalloys. We ensure proper solution annealing (982°C minimum) and precipitation hardening (718°C for 16 hours) for optimal high-temperature strength and creep resistance across all A286 12 point screws. Every heat is verified by in-house testing and PMI verification. With 24-27% nickel and titanium-aluminum precipitation hardening, our 12 point screws provide exceptional strength up to 700°C while maintaining excellent corrosion resistance.
Global approvals & traceability
Our quality system is ISO 9001:2015 and AS9100D certified; we also comply with NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS. Full material traceability from melt to final packaging (EN 10204 3.1/3.2). Third-party inspections (ABS, DNV, Lloyds) available. All A286 12 point screws meet applicable AMS, ASTM A453, and NACE MR0175 requirements. NAS, MS, and AS aerospace specifications available.
Precision cold heading & CNC machining
In-house precision cold heading and CNC machining ensure consistent 12-point head geometry and drive recess formation. Full drive inspection available with optical comparators and go/no-go gauges. Torque testing per IFI standards available. Shot peening and NDT capabilities in-house. Capability for UNJF-3A threads per MIL-S-8879.
Custom solutions
Need a special grip length, unusual head configuration, or custom thread combination for your high-temperature application? Our CNC turning and thread rolling departments handle short runs with agility. We also provide specialized coatings and high-temperature testing per customer requirements. Available in Class A, Class B, Class D (API sour service), and cold worked conditions.
Contact the A286 12 point screw experts today
Request a quote for A286 aerospace 12-point flange screws, external wrenching screws, 12-spline flange screws & custom configurations – any global standard (NAS, AN, MS, AS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS), any quantity. Inquire about high-temperature applications up to 700°C or NACE MR0175 sour service requirements.
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