AL6XN Button Head Cap 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
A mid-ranged corrosion resistant 6Mo alloy with good strength
Good corrosion resistance to moderate acids & sea-water
50% stronger than stainless steel
Usable temperature limit of 1000°F
Moderate general corrosion resistance
Excellent chloride / salt water protection
Good performance in phosphoric acid
Moderate resistance to nitric acid
Request a Quote from RAYCHIN
We're here to help!
RAYCHIN LIMITED
Specialist in AL6XN Button Head Cap Screws · Low Profile · Hex Socket · Torx · CustomAL6XN Button Head Cap Screws: Low Profile, Hex Socket, Torx & Custom Configurations
RAYCHIN LIMITED is a recognized expert in AL6XN button head cap screws — from AL6XN hex socket button head screws, AL6XN low profile button head screws, AL6XN Torx button head screws to custom non-standard button head screw configurations. AL6XN (UNS N08367) is a high-performance super austenitic stainless steel with 6% molybdenum and nitrogen, developed specifically for aggressive chloride-bearing environments such as seawater, offshore platforms, desalination plants, and chemical processing equipment. The button head design features a low-profile domed head with internal drive, providing a smooth appearance while requiring less head height than standard cap screws. With a Pitting Resistance Equivalent (PRE) typically exceeding 45, AL6XN offers exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking. Our portfolio includes button head cap screws manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS standards. Engineered for extreme environments where exceptional corrosion resistance and space constraints are critical. AL6XN button head cap screws are available in solution annealed condition with precision rolled threads and full traceability.
Complete Range of AL6XN Button Head Cap Screws
AL6XN Hex Socket Button Head Cap Screws
AL6XN hex socket button head cap screws featuring low-profile domed head with hexagon socket drive. Manufactured to DIN 7380, ISO 7380, and ASME B18.3 specifications. The hex socket drive provides positive engagement and allows for higher torque capacity than slotted or Phillips drives. The button head design offers a head height approximately 50% lower than standard socket head cap screws, ideal for limited clearance applications in seawater cooling systems, offshore platforms, and chemical processing equipment. Available in sizes from #0 to 1" (M2 to M24). Heat treated in solution annealed condition for exceptional corrosion resistance.
AL6XN Torx Button Head Cap Screws
AL6XN Torx button head cap screws with hexalobular drive for maximum torque transmission and cam-out resistance. The Torx drive provides superior torque transfer and extended tool life compared to hex socket drives, making them ideal for high-vibration marine applications. Available with Torx drive sizes T6 through T60. Security Torx variants with center pins available for anti-tamper applications. The low-profile button head design provides a smooth appearance while maintaining the exceptional corrosion resistance of AL6XN in chloride environments.
AL6XN Low Profile Button Head Screws
AL6XN low profile button head screws with reduced head height for extremely limited clearance applications in corrosive environments. Designed to customer specifications with head heights 20-30% lower than standard button head screws. Ideal for compact assemblies in marine instrumentation, offshore control panels, and desalination equipment where space is at a premium. Available with hex socket or Torx drive. Maintains the exceptional corrosion resistance of AL6XN in seawater and chloride environments.
AL6XN Metric Button Head Cap Screws
AL6XN metric button head cap screws manufactured to DIN 7380 and ISO 7380 standards. Available in coarse and fine thread pitches from M2 to M24. Precision rolled threads with Class 6g tolerance. The button head design provides a smooth appearance with head height approximately 50% of standard socket head cap screws. Ideal for international projects requiring metric fasteners with exceptional corrosion resistance in marine and chemical applications. Widely used in European offshore equipment and desalination plants.
AL6XN Aerospace & Military Button Head Screws
AL6XN button head screws manufactured to NAS, AN, and MS specifications including NAS 1351, NAS 1352, and MS specifications. Available with UNJF-3A threads per MIL-S-8879 for enhanced fatigue life. Shot peened per aerospace requirements and available with silver or cadmium plating for anti-galling. Full traceability with material certification and third-party testing available. Ideal for naval aerospace applications, marine defense systems, and high-corrosion military equipment requiring low-profile fasteners.
Custom & Specialty AL6XN Button Head Cap Screws
Need a special head diameter, reduced head height, or custom drive configuration for your marine or chemical application? RAYCHIN engineers work with you to produce custom AL6XN button head cap screws to your drawing. Expert solution annealing (1100–1200°C followed by water quenching) precisely controlled for each batch. Manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS standards. Custom drive depths and tamper-resistant configurations available.
Button Head Design Advantages for AL6XN Screws
Low Profile
Button head screws have a head height approximately 50% lower than standard socket head cap screws, ideal for confined spaces and low-clearance applications in marine and chemical equipment.
Wide Bearing Surface
The button head provides a larger bearing surface compared to other low-profile heads, making it ideal for clamping thin materials without counter-boring.
Internal Drive
Hex socket or Torx internal drives allow for positive engagement and higher torque capacity than external drives, with reduced risk of cam-out during installation.
Smooth Appearance
The domed head provides a smooth, finished appearance that is aesthetically pleasing for visible marine equipment and offshore installations.
Manufacturing Standards for AL6XN Button Head Cap Screws
RAYCHIN LIMITED manufactures AL6XN button head cap 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 AL6XN Button Head Cap Screws
To serve clients worldwide, RAYCHIN LIMITED manufactures AL6XN button head cap 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 N08367 AL6XN ASTM B691 ASTM B688 NACE MR0175 DIN 7380 ISO 7380
Chemical Composition (Weight %) – AL6XN Super Austenitic Stainless Steel
Our AL6XN button head cap screws are produced from melts that strictly conform to the limits below per ASTM B691 / UNS N08367. The high levels of chromium, nickel, molybdenum, and nitrogen provide exceptional resistance to pitting and crevice corrosion, with a Pitting Resistance Equivalent (PRE) typically exceeding 45. The high nickel and molybdenum content delivers better corrosion resistance than Duplex 2205 and Super Duplex 2507 in highly aggressive chloride environments.
Expert note: The high molybdenum (6-7%) and nitrogen (0.18-0.25%) content gives AL6XN a PRE value exceeding 45, providing resistance to pitting and crevice corrosion in seawater and other chloride environments that is far superior to 316L (PRE≈24) and 317L (PRE≈29). The high nickel content (23.5-25.5%) provides exceptional resistance to chloride stress corrosion cracking. This makes AL6XN button head cap screws ideal for offshore, desalination, and FGD applications. The material also meets NACE MR0175 requirements for sour service in oil and gas environments.
Complete Mechanical Properties of AL6XN Button Head Cap Screws (Solution Annealed Condition)
AL6XN button head cap screws are supplied in the solution annealed condition (1100–1200°C followed by water quenching). The data below represent typical values per ASTM B691 and manufacturer specifications.
Mechanical Properties at Room Temperature
High Temperature Performance of AL6XN Button Head Cap Screws
AL6XN maintains good mechanical properties at elevated temperatures, with a suggested operating range from -196°C to 427°C (-320°F to 800°F). It should not be exposed to temperatures above 427°C for prolonged periods due to metallurgical stability considerations. For continuous service, the maximum operating temperature is approximately 400°C.
Temperature-Dependent Yield Strength (0.2% Offset)
Note: AL6XN is not recommended for applications requiring prolonged exposure above 427°C (800°F). The material maintains excellent oxidation resistance up to 500°C and retains good impact strength at cryogenic temperatures down to -196°C.
Thermal Stability Limits
Corrosion Resistance of AL6XN Button Head Cap Screws
AL6XN was specifically developed for use in aggressive chloride-bearing environments. Its high molybdenum (6-7%), chromium (20-22%), nickel (23.5-25.5%), and nitrogen (0.18-0.25%) content provide exceptional resistance to localized corrosion, including pitting, crevice corrosion, and stress corrosion cracking. The material is frequently used as a cost-effective alternative to nickel-based alloys such as C-276 in moderately corrosive conditions.
Pitting and Crevice Corrosion Resistance
The Pitting Resistance Equivalent (PRE) for AL6XN is typically >45, calculated as PRE = %Cr + 3.3 × %Mo + 16 × %N. This value is significantly higher than 316L (PRE≈24) and 317L (PRE≈29), and even exceeds that of 6% molybdenum alloys like 254SMO. Tests in natural seawater have shown that AL6XN can be exposed for prolonged periods without suffering crevice corrosion. In chloride environments with concentrations of 10,000-70,000 ppm and temperatures of 50-68°C, AL6XN demonstrates virtually no pitting or crevice corrosion.
Stress Corrosion Cracking (SCC) Resistance
Ordinary austenitic steels (304, 316) are prone to chloride stress corrosion cracking at temperatures above 60°C. AL6XN, with its high nickel content (24-25%) and molybdenum (6-7%), exhibits excellent resistance to SCC. The material is approved per NACE MR0175/ISO 15156 for sour service applications in oilfield equipment.
Critical Corrosion Considerations
- PRE >45: The high Pitting Resistance Equivalent ensures outstanding performance in seawater and aggressive chemical environments. With 6-7% molybdenum content, AL6XN provides exceptional resistance to chloride-induced pitting and crevice corrosion.
- NACE MR0175 Compliance: AL6XN is qualified for sour service (sulfide stress cracking resistance) in oilfield equipment per NACE MR0175/ISO 15156.
- Temperature Limitations: Maximum service temperature for corrosion applications is approximately 400°C. Avoid exposure to temperatures above 427°C for prolonged periods.
- Galvanic Corrosion: When paired with lower-grade materials, galvanic corrosion should be considered. AL6XN is cathodic to most other stainless steels. Proper isolation may be required in mixed-material assemblies.
- Comparison to Duplex: With higher nickel and molybdenum content than Duplex 2205 and Super Duplex 2507, AL6XN delivers better corrosion resistance in highly aggressive chloride environments.
Corrosion Engineering Note: For critical applications in aggressive environments, RAYCHIN LIMITED can provide passivation, specialized coatings (Xylan, PTFE, silver plating), or recommend optimal heat treatment conditions. Third-party corrosion testing per ASTM G31, G48, or G61 available upon request. NACE MR0175 compliant AL6XN button head cap screws available for sour service applications. In many applications, AL6XN serves as a cost-effective substitute for high nickel alloys such as C-276 in moderately corrosive conditions.
Special focus: AL6XN Button Head Cap Screws for Marine, Offshore & Chemical Applications
For critical applications requiring low profile and exceptional corrosion resistance, RAYCHIN offers AL6XN button head cap screws manufactured to ASTM, ASME, NACE, and customer-specific specifications. Our capabilities include:
- Marine Applications: Seawater cooling systems, ballast water systems, firefighting systems, offshore platforms, desalination plants, shipbuilding, marine instrumentation
- Chemical Processing: Reactors, tanks, pumps, valves, and piping exposed to chlorides and acids, heat exchangers, distillation columns
- Flue Gas Desulfurization (FGD): Scrubbers, absorbers, ducting, and piping systems in power plants
- Pulp & Paper: Bleach plants, digesters, storage tanks handling aggressive media, pulp mill bleach systems
- Power Generation: FGD scrubbers, cooling water systems, nuclear power water piping
- Oil & Gas: Offshore platforms, subsea equipment, refinery applications, sour service per NACE MR0175
- Pharmaceutical & Food Processing: Equipment requiring corrosion resistance and purity, caustic chloride systems
- Aerospace Standards: NAS 1351, NAS 1352, MS 16995, MS 16996, MS 16997
- International Standards: DIN 7380, ISO 7380 (hex socket button head)
- Drive Types: Hex socket, Torx, security Torx, custom drives
- 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, PTFE coating, Xylan
- NACE MR0175 Compliance: Certified for sour service applications
- Custom: Special head diameters, reduced head heights, unusual drive sizes, custom thread combinations per customer drawings
All AL6XN button head cap screws are supplied with full traceability and third-party NDT upon request. Sizes available from M2 to M48 (#0 to 2") in all standard configurations.
Why RAYCHIN LIMITED – The AL6XN Button Head Cap Screw Authority
Metallurgical competence
Engineers on staff with deep expertise in super austenitic stainless steels. We ensure proper solution annealing (1100–1200°C) and rapid quenching for optimal corrosion resistance and mechanical properties across all AL6XN button head cap screws. Every heat is verified by in-house testing and PMI verification. With 6-7% molybdenum and 24% nickel, our button head screws provide exceptional corrosion resistance in aggressive chloride environments.
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.
Precision cold heading & drive forming
In-house precision cold heading and CNC machining ensure consistent head geometry and drive recess formation. Head height controlled to tight tolerances for low-profile applications. Full drive inspection available with optical comparators and go/no-go gauges. Torque testing per IFI standards available.
Custom solutions
Need a special head diameter, reduced head height, or custom drive configuration for your marine or chemical application? Our cold heading and CNC turning departments handle short runs with agility. We also provide specialized coatings and corrosion testing per customer requirements.
Contact the AL6XN button head cap screw experts today
Request a quote for AL6XN button head cap screws, hex socket button head screws, Torx button head screws, low profile button head screws & custom configurations – any global standard (NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS), any quantity. Inquire about NACE MR0175 sour service applications.
sales@ray-chin.com | +86 534 2166 566Our team speaks English, German, Mandarin, and Japanese – ready for your global procurement.
Request A Quote! We'll respond as soon as possible(within 12 hours)
Get a Quote