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A286 Set Screws

A286 (1.4980) Set Screws, also known as Alloy 660 Set Screws are stainless steel alloy which contains iron, nickel and chromium. A286 Set Screws are known for their high strength, creep resistance and oxidation resistance at elevated temperatures once age hardened. As a result, A286 Set Screws provide high levels of strength from room temperature up to about 1300°F (700°C).

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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

Name: A286 Set Screws
SKU: 0

Specialist in A286 Set Screws · Cup Point · Cone Point · Flat Point · Custom

A286 Set Screws: High-Temperature Superalloy Set Screws for Critical Fastening Applications

Precipitation Hardening Iron-Base Superalloy (UNS S66286 / Alloy 660 / 1.4980 / ASTM A453 Grade 660)

RAYCHIN LIMITED is a recognized expert in A286 set screws — from A286 cup point set screws, A286 cone point set screws, A286 flat point set screws to custom non-standard set 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 set screw applications in gas turbines, exhaust manifolds, power generation, aerospace, and oil & gas (sour service). A286 set screws are specifically designed for securing rotating parts such as gears, pulleys, and shafts operating at elevated temperatures, with excellent resistance to vibration and thermal cycling. Our portfolio includes set screws manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS standards. Engineered for extreme environments where high-temperature strength, creep resistance, and corrosion resistance are critical. A286 set screws are supplied in solution annealed and precipitation hardened conditions with full traceability and third-party certifications.

A286 set screwsA286 cup point set screwsA286 cone point set screwsA286 flat point set screwsAlloy 660 set screwsUNS S66286 set screwsASTM A453 Grade 660 set screwsAMS 5732 set screwsAMS 5737 set screwsNACE MR0175 set screwsAPI 20F set screws1.4980 set screwshigh temperature set screwsgas turbine set screwsmanifold set screwssour service set screwscryogenic set screws

Complete Range of A286 Set Screws – Point Styles & Configurations

A286 Cup Point Set Screws

A286 cup point set screws featuring a cup-shaped indentation on the driving end. This is the most commonly used set screw style, designed to bite into the mating surface for secure holding. The cup point edge cuts into the shaft or inner object, providing excellent resistance to rotational slippage. Ideal for quick, semi-permanent or permanent assembly applications where high-temperature strength up to 700°C is required. Available in sizes from #2 to 1" (M2 to M24) with hex socket or slotted drive. Manufactured to ASME B18.3, DIN 916, and ISO 4026 standards.

A286 Cone Point Set Screws

A286 cone point set screws featuring a sharp cone-shaped point that provides the strongest clamping force due to deep penetration into the mating surface. The cone point creates a positive locking action that prevents loosening under severe vibration and thermal cycling. Ideal for permanent assembly applications and for locating parts precisely on a shaft. Available with hex socket or slotted drive. Manufactured to ASME B18.3, DIN 914, and ISO 4027 standards. Suitable for gas turbine components, manifold systems, and high-temperature shaft assemblies.

A286 Flat Point Set Screws

A286 flat point set screws featuring a flat, smooth bottom surface. This style is used when frequent adjustment or disassembly is required and minimal shaft deformation is desired. The flat point does not mar the mating surface, allowing for repeated repositioning. Ideal for applications requiring precise alignment and frequent maintenance. Available with hex socket or slotted drive. Manufactured to ASME B18.3, DIN 913, and ISO 4028 standards. Suitable for cryogenic equipment, instrument mounting, and adjustable assemblies.

A286 Set Screws – API & NACE Compliant

A286 set screws certified to NACE MR0175 / ISO 15156 for sour service applications in oil and gas industry. Class D condition with controlled hardness ≤ 35 HRC per API 20F BSL2 & BSL3 requirements. Suitable for wellhead equipment, valve assemblies, subsea connections, and refinery applications exposed to H₂S environments. Available in all point styles with 100% hardness testing and Charpy impact testing at -196°C per Class D requirements.

A286 Set Screws for Gas Turbines & Exhaust

A286 set screws specifically designed for gas turbine and exhaust manifold applications: compressor casings, turbine sections, exhaust flanges, and manifold connections. The alloy's high creep-rupture strength at 650°C (tested per ASTM A453 stress rupture requirements: 386 MPa min for 100 hours at 650°C) makes it ideal for these demanding applications. Non-magnetic property maintained even after severe cold deformation. Available with silver plating per AMS 2410 for anti-seize.

Custom & Specialty A286 Set Screws

Need a special point style, unusual drive configuration, or custom length for your high-temperature application? RAYCHIN engineers work with you to produce custom A286 set screws to your drawing. Options include half-dog point, knurled cup point, extended point, and special drive options. 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.

Key Benefits of A286 Set Screws

High-Temperature Strength Retention

Maintains high strength up to 700°C, with stress rupture testing at 650°C required per ASTM A453 (386 MPa min for 100 hours). Ideal for exhaust and turbine applications.

Multiple Point Styles Available

Cup point for general use, cone point for maximum holding power, flat point for adjustable applications. Custom point geometries available.

Sour Service Approved

NACE MR0175 / ISO 15156 qualified for H₂S environments; Class D with hardness ≤ 35 HRC meets API 20F requirements.

Non-Magnetic

Permeability ≤ 1.01, non-magnetic even after severe cold deformation – essential for sensitive instrumentation and MRI equipment.

Oxidation Resistance

Excellent oxidation resistance up to 815°C continuous service and 982°C intermittent. Forms protective Cr₂O₃ scale.

Cryogenic Toughness

Maintains ductility and impact strength down to -196°C, with Charpy testing available per Class D requirements (40 J min).

Manufacturing Standards for A286 Set Screws

RAYCHIN LIMITED manufactures A286 set screws to the following national and international standards, ensuring full compliance for projects worldwide. Both standard and non-standard custom configurations are available.

NASANMSANSIASTMASMESAEAPINACEISODINKSJISGB

Set Screw Dimensional Standards

Point Style	DIN	ISO	ASME	Drive Type
Flat Point	DIN 913	ISO 4028	ASME B18.3	Hex Socket / Slotted
Cone Point	DIN 914	ISO 4027	ASME B18.3	Hex Socket / Slotted
Cup Point	DIN 916	ISO 4026	ASME B18.3	Hex Socket / Slotted
Half-Dog Point	DIN 915	ISO 4029	ASME B18.3	Hex Socket / Slotted
Knurled Cup Point	DIN 917	ISO 4029	ASME B18.3	Hex Socket

All dimensional standards available in UNC, UNF, UNJF-3A per MIL-S-8879, and metric thread configurations. Standard sizes from #0 to 1" (M1.6 to M24).

International Standards & Global Designations for A286 Set Screws

To serve clients worldwide, RAYCHIN LIMITED manufactures A286 set 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.

Country / Region	Standard / Specification	Designation / Grade
USA	ASTM A453 / A638, ASME SA453, AMS 5731, AMS 5732, AMS 5734, AMS 5737, AMS 5525, AMS 5853, AMS 5858	UNS S66286 · Grade 660 · Alloy 660
Europe (CEN)	EN 10269 (for fasteners), EN 10083-3, EN 10302	1.4980 · 1.4944 · X5NiCrTi26-15 · X6NiCrTiMoVB25-15-2
Germany (DIN)	DIN EN 1.4980, DIN 17440 (former), Werkstoff 1.4980, DIN 913/914/915/916 (set screws)	1.4980 · X5NiCrTi26-15
France (NF)	NF A35-572/573, NF E25-xxx	Z6NCTDV25-15 · Z5NCTDV26-15B
UK (BS)	BS HR51, BS HR52, BS HR650, BS 2S 143	HR51 / HR52
China (GB)	GB/T 1220, GB/T 20878, GB/T 3098.6, GB/T 77/78/79/80 (set screws)	0Cr15Ni25Ti2MoAlVB · GH2132
Japan (JIS)	JIS G4303, JIS G4311, JIS B1177 (set screws)	SUH 660
ISO	ISO 683-17, ISO 3506-5, ISO 15156-3, ISO 4026-4029 (set screws)	X5NiCrTi26-15
NACE	NACE MR0175 / ISO 15156	A286 (qualified for sour service)
API	API 20F, API 6A	Grade 660 Class D (closure bolting)

UNS S66286 Alloy 660 ASTM A453 AMS 5732 AMS 5737 NACE MR0175 1.4980 API 20F

Chemical Composition (Weight %) – A286 Superalloy (UNS S66286 / 1.4980)

Our A286 set 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.

Element	ASTM A453 / AMS (Range %)	Typical (analysis)
Carbon (C)	≤ 0.08	0.04
Manganese (Mn)	≤ 2.00	1.20
Phosphorus (P)	≤ 0.025	0.015
Sulfur (S)	≤ 0.025	0.010
Silicon (Si)	≤ 1.00	0.50
Chromium (Cr)	13.5 – 16.0	15.0
Nickel (Ni)	24.0 – 27.0	25.5
Molybdenum (Mo)	1.00 – 1.50	1.30
Titanium (Ti)	1.90 – 2.35	2.10
Vanadium (V)	0.10 – 0.50	0.25
Aluminum (Al)	≤ 0.35	0.20
Boron (B)	0.001 – 0.010	0.005
Copper (Cu)	≤ 0.50	0.20
Iron (Fe)	Balance	Balance

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. Boron addition (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 Set Screws (per ASTM A453)

A286 set 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 unless otherwise noted.

Tensile Requirements by Class – ASTM A453 Grade 660

Class	Size Range	Tensile Strength (min)	Yield Strength 0.2% Offset (min)	Elongation (min)	Reduction of Area (min)
Class A	All sizes	896 MPa (130 ksi)	586 MPa (85 ksi)	15%	18%
Class B	All sizes	793 MPa (115 ksi)	517 MPa (75 ksi)	15%	18%
Class C	All sizes	896 MPa (130 ksi)	586 MPa (85 ksi)	15%	18%
Class D	≤ 2½" (63.5mm)	896 MPa (130 ksi)	724 MPa (105 ksi)	15%	18%
Class D	> 2½" (63.5mm)	825 MPa (120 ksi)	655 MPa (95 ksi)	15%	18%
Cold Worked	All sizes	1103 MPa (160 ksi)	827 MPa (120 ksi)	12%	18%

Hardness Requirements

Class	Brinell Hardness Range	Rockwell C Equivalent
Class A, B, C	248 – 341 HB	24 – 37 HRC
Class D (≤ 2½")	248 – 321 HB	24 – 35 HRC
Class D (> 2½")	248 – 321 HB	24 – 35 HRC
Cold Worked	248 – 341 HB	24 – 37 HRC

For NACE MR0175 / API 20F sour service applications, Class D with maximum hardness 35 HRC is required and 100% hardness testing is mandatory.

Impact Properties (Charpy V-Notch)

Test Temperature	Minimum Average Impact Energy	Notes
-196°C (-320°F)	77 J (57 ft-lbs) typical	Class D requirements: 40 J min at -196°C
-100°C (-148°F)	92 J (68 ft-lbs) typical	API 6A PSL 3/4: 27 J min longitudinal
27°C (80°F)	87 J (64 ft-lbs) typical	Room temperature reference

Stress Rupture Properties (650°C / 1200°F)

A critical requirement for high-temperature set screws is stress rupture resistance. Per ASTM A453, Class A, B, and C materials must meet the following:

Test Temperature	Applied Stress (min)	Time to Rupture (min)	Elongation (min)
650°C (1200°F)	386 MPa (56 ksi)	100 hours	5%

Note: Class D does not have a stress rupture requirement (marked "NR" in the standard).

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.

Temperature	Yield Strength (typical)	Retention (%)
Room Temperature (20°C)	655 MPa (95 ksi)	100%
200°C (392°F)	620 MPa (90 ksi)	95%
300°C (572°F)	600 MPa (87 ksi)	92%
400°C (752°F)	580 MPa (84 ksi)	89%
500°C (932°F)	550 MPa (80 ksi)	84%
600°C (1112°F)	480 MPa (70 ksi)	73%
650°C (1202°F)	420 MPa (61 ksi)	64%
700°C (1292°F)	350 MPa (51 ksi)	53%

Thermal Expansion Properties of A286 Set Screws

A286 set screws are designed for applications requiring thermal stability and compatibility with austenitic stainless steel components. The thermal expansion coefficient closely matches that of 304/316 stainless steels, preventing loosening during thermal cycling in high-temperature assemblies such as exhaust manifolds and turbine casings.

Property	Value
Thermal Expansion Coefficient (20-100°C)	16.0 – 16.5 x 10⁻⁶ /°C
Thermal Conductivity (20°C)	13 W/m·K
Specific Heat (20°C)	0.42 J/g·°C

API 6A & NACE MR0175 Compliance for A286 Set Screws

A286 set 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.

Specification	Requirement	A286 Compliance
API 20F BSL2 & BSL3	Maximum hardness 35 HRC	Class D: 24-35 HRC ✓
NACE MR0175 / ISO 15156	Sour service qualification	Qualified for H₂S environments
Charpy Impact @ -196°C	40 J minimum (Class D)	≥ 40 J typical

Application Note: For sour service applications requiring NACE MR0175 compliance, RAYCHIN recommends A286 Class D set screws with controlled hardness ≤ 35 HRC. 100% hardness testing is performed per API 20F requirements. Suitable for wellhead equipment, valve assemblies, and subsea applications.

Heat Treatment & Microstructural Stability of A286 Set Screws

Optimal mechanical properties in A286 set screws are achieved through a two-step heat treatment:

Solution Annealing: 982°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 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

Density	7.92 g/cm³ (0.286 lb/in³)
Melting Point	1370 – 1430°C (2500 – 2610°F)
Modulus of Elasticity	201 GPa (29,200 ksi)
Electrical Resistivity	9.1 × 10⁻⁵ ohm-cm
Magnetic Permeability	≤ 1.01 (non-magnetic)

Corrosion Resistance of A286 Set 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 set screws form a protective Cr₂O₃ scale that prevents further oxidation at elevated temperatures. They provide excellent oxidation resistance up to 815°C in continuous service and up to 982°C for intermittent service.

Corrosion in Other Environments

Environment	Corrosion Resistance	Notes
Aqueous Corrosion	Good	Similar to 304/316 stainless steels in many environments, with enhanced resistance due to higher nickel content.
Sour Service (H₂S environments)	Good	Qualified per NACE MR0175/ISO 15156 for oil and gas applications.
Chloride Stress Corrosion Cracking	Excellent	The high nickel content (24-27%) provides exceptional resistance to chloride SCC, far superior to 304 and 316 stainless steels.
Oxidizing Acids	Moderate to Good	Suitable for nitric acid applications. Less resistant to reducing acids like hydrochloric.
Cryogenic Temperatures	Excellent	Non-magnetic, excellent for cryogenic equipment down to -196°C.

Critical Corrosion Considerations for Set Screws

Oxidation Resistance: Excellent oxidation resistance up to 815°C in gas turbine and exhaust environments. Suitable for continuous service up to 700°C.
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 (permeability ≤ 1.01), making it suitable for applications requiring non-magnetic fasteners such as MRI equipment and sensitive instrumentation.

Special focus: A286 Set Screws for High-Temperature & Critical Applications

For critical applications requiring high-temperature strength, oxidation resistance, and corrosion resistance, RAYCHIN offers A286 set screws manufactured to ASTM, ASME, NACE, and customer-specific specifications. Our capabilities include:

Gas Turbines & Power Generation: Compressor casing set screws, turbine section fastening, exhaust manifold connections, shaft securing, blade retention.
Oil & Gas / Sour Service: Wellhead equipment, valve assemblies, subsea connections, refinery piping, API 6A closure fastening, NACE MR0175 applications.
Aerospace: Engine mount set screws, thrust nozzle fasteners, transmission components, missile guidance systems.
Automotive: Turbocharger set screws, exhaust manifold fasteners, high-performance engine components, heat shield attachment.
Cryogenic Equipment: LNG facilities, cryogenic storage tanks, superconducting magnets, particle accelerators.
Chemical Processing: High-temperature reactor set screws, reformer connections, heat exchanger tube fastening.
Point Styles: Cup point (standard), cone point (maximum holding), flat point (adjustable), half-dog point, custom points per drawing.
Drive Options: Hex socket (Allen), slotted, spline, Torx, Phillips, custom drives.
Thread Specifications: UNC/UNF, metric coarse/fine, UNJF-3A per MIL-S-8879 – all classes up to 3A/6g.
Surface Treatments: Silver plating per AMS 2410 for anti-seize, passivation per ASTM A967, Xylan coatings, PTFE, vacuum-compatible lubricants.
Class Selection: Class A (standard strength), Class B, Class D (higher yield strength, API sour service), Cold Worked (maximum strength).

All A286 set screws are supplied with full traceability and third-party NDT upon request. Sizes available from #0 to 1" (M1.6 to M24) in all standard point styles. Material certifications (EN 10204 3.1/3.2) included.

Why RAYCHIN LIMITED – The A286 Set 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 set screws. Every heat is verified by in-house testing and PMI verification. With 24-27% nickel and titanium-aluminum precipitation hardening, our set 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 set screws meet applicable AMS, ASTM A453, and NACE MR0175 requirements.

Precision point forming & threading

In-house CNC turning and precision point forming capabilities ensure consistent point geometry and holding power. Cup points are precisely formed for optimal bite, cone points are sharp and concentric, and flat points are perfectly square. 100% thread inspection available. Ultrasonic cleaning and passivation available for critical applications.

Custom solutions

Need a special point style, unusual drive configuration, or custom material certification for your high-temperature application? Our CNC turning and threading departments handle short runs with agility. We also provide specialized coatings and cryogenic impact testing per customer requirements. Available in Class A, Class B, Class D (API sour service), and cold worked conditions.

Contact the A286 set screw experts today

Request a quote for A286 set screws, cup point, cone point, flat point & custom configurations – any global standard (NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS), any quantity. Inquire about high-temperature set screws up to 700°C, NACE MR0175 sour service requirements, or cryogenic applications.

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