A286 Shoulder Bolts
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 Shoulder Bolts · Precision Shoulder Screws · Stripper Bolts · CustomA286 Shoulder Bolts: Precision Shoulder Screws, Stripper Bolts, Hex Head, Socket Head & Custom Configurations
RAYCHIN LIMITED is a recognized expert in A286 shoulder bolts — from A286 precision shoulder screws, A286 stripper bolts, A286 hex head shoulder bolts, A286 socket head shoulder bolts, A286 close tolerance shoulder bolts to custom non-standard shoulder bolt configurations. Shoulder bolts (also known as stripper bolts) feature a precision-ground shoulder that serves as a bearing surface, pivot point, or locating dowel, with the threaded portion having a smaller diameter than the shoulder. 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 shoulder bolt applications in gas turbines, jet engines, and aerospace assemblies. Our portfolio includes shoulder bolts manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS standards. Engineered for extreme environments where high-temperature strength, precision tolerances, and corrosion resistance are critical. A286 shoulder bolts are available in solution annealed and aged conditions with full traceability.
Complete Range of A286 Shoulder Bolts
A286 Precision Shoulder Screws
A286 precision shoulder screws manufactured to ASME B18.3, DIN 9812, and ISO 7378 specifications. Used as pivot pins, guide pins, and locating dowels in high-temperature machinery and fixtures. Shoulder diameters from 1/8" to 1" (M3 to M24) with ground finish tolerance of h6 or h7. Available with hex drive, socket drive, or slotted drive configurations. Ideal for applications requiring precise shoulder length and concentricity in gas turbines, jet engine components, and high-temperature processing equipment. Exceptional oxidation resistance up to 700°C.
A286 Stripper Bolts
A286 stripper bolts (also known as shoulder bolts) for die sets, mold bases, and stamping applications in high-temperature environments. Manufactured to DIN 9812 and JIS B 1176 standards. Available in standard and extended shoulder lengths. The precision-ground shoulder provides wear resistance for high-cycle applications in heat treatment fixtures and high-temperature tooling. Proof load tested with full traceability. Maintains strength and oxidation resistance up to 700°C.
A286 NAS1160 Shoulder Bolts
A286 NAS1160 shoulder bolts manufactured to NAS1160 specifications for aerospace applications. These hex head, close tolerance shoulder bolts are used extensively in aircraft structures including F-35 aircraft and other military platforms. Available with 95 ksi FSU (flush surface upset) requirements. Shot peened per aerospace requirements and available with silver plating for anti-galling. Full traceability with material certification and third-party testing available. Ideal for critical aerospace assemblies requiring high-temperature strength and precision tolerances.
A286 NA0252 Shoulder Bolts (Metric)
A286 NA0252 shoulder bolts manufactured to NA0252 aerospace specification for metric applications. These hex head, close tolerance shoulder bolts are rated for 1100 MPa tensile strength at ambient temperature. Designed for European aerospace programs and international high-temperature applications. Available in metric sizes with full traceability. The combination of A286 superalloy and precision manufacturing ensures exceptional performance in turbine engines and high-temperature structural applications.
A286 Hex Head & Socket Head Shoulder Bolts
A286 hex head shoulder bolts and A286 socket head shoulder bolts for applications requiring different drive types. Hex head versions are ideal for higher torque applications, while socket head versions provide a compact envelope for limited clearance applications. Available in all standard shoulder diameters and lengths. Precision-ground shoulders with tolerances to ±0.0005". Ideal for aerospace, power generation, and oil & gas applications requiring high-temperature strength and corrosion resistance.
Custom & Specialty A286 Shoulder Bolts
Need a special shoulder diameter, unusual length, or custom head configuration for your high-temperature application? RAYCHIN engineers work with you to produce custom A286 shoulder bolts 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 shoulders available with tolerances to ±0.0005" and surface finishes down to 8 Ra.
Shoulder Bolt Design Advantages for A286 Applications
Precision Ground Shoulder
The shoulder serves as a bearing surface, pivot point, or locating dowel. Ground to tight tolerances (h6/h7) for accurate positioning in high-temperature assemblies.
Multiple Drive Options
Available in hex head, socket head, or slotted drive configurations to suit different installation requirements and clearance constraints.
High-Temperature Capability
A286 maintains excellent strength up to 700°C, making these shoulder bolts ideal for gas turbines, exhaust systems, and heat treatment fixtures.
Aerospace Standards
Available to NAS1160, NA0252, and other aerospace specifications for critical aircraft and defense applications.
Manufacturing Standards for A286 Shoulder Bolts
RAYCHIN LIMITED manufactures A286 shoulder bolts 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 Shoulder Bolts
To serve clients worldwide, RAYCHIN LIMITED manufactures A286 shoulder bolts 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 NAS1160 NA0252
Chemical Composition (Weight %) – A286 Superalloy (UNS S66286 / 1.4980)
Our A286 shoulder bolts 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 Shoulder Bolts (per ASTM A453)
A286 shoulder bolts 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.
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 Shoulder Bolts
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 shoulder bolts used as pivot points and locating dowels in high-temperature assemblies.
This expansion match is critical for maintaining accurate positioning and pivot clearances in high-temperature applications such as turbine linkages, exhaust systems, and heat treatment fixtures. Standard alloy steel bolts expand less than the surrounding components, leading to binding or loss of clearance. A286 eliminates this mismatch.
API 6A & NACE MR0175 Compliance
A286 shoulder bolts 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.
Aerospace Specifications for A286 Shoulder Bolts
A286 shoulder bolts are extensively used in aerospace applications per the following specifications:
Aerospace fastener part numbers encode critical information. For example, NAS6706U8 indicates a NAS standard hex bolt (67), 3/8" diameter (06), A286 with passivation (U), and 1/2" grip length (8).
Heat Treatment & Microstructural Stability
Optimal mechanical properties in A286 shoulder bolts 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 Shoulder Bolts
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 shoulder bolts 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 high-temperature exhaust streams.
Corrosion in Other Environments
Critical Corrosion Considerations for Shoulder Bolts
- Oxidation Resistance: Excellent oxidation resistance up to 1500°F (815°C) in exhaust stream conditions.
- 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 corrosion applications is approximately 700°C (1300°F).
- 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, sensitive instrumentation, and cryogenic 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 shoulder bolts 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 Shoulder Bolts for Aerospace, Power Generation & Oil & Gas
For critical applications requiring precision shoulder tolerances and high-temperature strength, RAYCHIN offers A286 shoulder bolts manufactured to NAS, MS, AN, DIN, ISO, and customer-specific specifications. Our capabilities include:
- Aerospace Applications: F-35 aircraft structures, jet engine components, turbine casings, exhaust systems, thrust reverser linkages, control mechanisms, landing gear pivot points. Meets NAS1160, NA0252, NAS1297, AN 555, and MS 51946 specifications.
- Gas Turbines & Power Generation: Turbine linkage pivots, combustion chamber supports, heat exchanger components, steam turbine mechanisms, HRSG connections, valve stem guides.
- Oil & Gas: Offshore platform equipment, subsea assemblies, wellhead components, refinery valve linkages, sour service per NACE MR0175, high-temperature piping supports.
- Automotive: Turbocharger linkages, exhaust manifold supports, high-temperature sensor attachments, racing and performance applications.
- Chemical Processing: High-temperature reactor internals, mixer shaft guides, valve positioning mechanisms, thermowell assemblies.
- Heat Treating: Fixture pivot points, tray linkages, retort support mechanisms, furnace door guides.
- Shoulder Tolerances: Ground to h6 or h7, custom tolerances to ±0.0005".
- Drive Types: Hex head (NAS1160 style), socket head, slotted, Torx (custom).
- Thread Specifications: UNC/UNF, metric coarse/fine, UNJF-3A per MIL-S-8879, MJ – all classes up to 3A/6g.
- Surface Treatments: Passivation, silver plating (AMS 2410 for anti-galling), Xylan, PTFE coating, cadmium plating (AMS 2400).
- Class Selection: Class A (standard strength), Class B, Class D (higher yield strength, API sour service), Cold Worked (maximum strength).
- Custom: Special shoulder diameters, unusual lengths, custom head configurations, reduced shank designs per customer drawings.
All A286 shoulder bolts are supplied with full traceability and third-party NDT upon request. Sizes available from M3 to M100 (1/8" to 4") in all standard configurations. Material certifications (EN 10204 3.1/3.2) included.
Why RAYCHIN LIMITED – The A286 Shoulder Bolt 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 shoulder bolts. Every heat is verified by in-house testing and PMI verification. With 24-27% nickel and titanium-aluminum precipitation hardening, our shoulder bolts 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 shoulder bolts meet applicable AMS, ASTM A453, and NACE MR0175 requirements. NAS1160, NA0252, and other aerospace specifications available.
Precision grinding capabilities
In-house centerless and cylindrical grinding ensures consistent shoulder diameter tolerances to ±0.0005". Surface finishes down to 8 Ra available for critical high-temperature pivot applications. Runout controlled to ≤ 0.001" for precision locating applications. Shoulder diameters ground to h6 or h7 tolerances per customer requirements.
Custom solutions
Need a special shoulder diameter, unusual length, or custom head configuration for your high-temperature application? Our CNC turning and grinding 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 shoulder bolt experts today
Request a quote for A286 precision shoulder screws, stripper bolts, hex head shoulder bolts, socket head shoulder bolts & custom configurations – any global standard (NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS), any quantity. Inquire about high-temperature applications up to 700°C, NACE MR0175 sour service requirements, or NAS1160/NA0252 aerospace specifications.
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