AL6XN 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
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
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RAYCHIN LIMITED
Specialist in AL6XN 12 Point Screws · Aerospace · External Wrenching · CustomAL6XN 12 Point Screws: Aerospace 12-Point Flange Screws, External Wrenching & Custom Configurations
RAYCHIN LIMITED is a recognized expert in AL6XN 12 point screws — from AL6XN aerospace 12-point flange screws, AL6XN external wrenching screws, AL6XN 12-spline flange screws to custom non-standard 12 point 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 [citation:3][citation:4]. The 12-point drive allows for higher torques than hex heads while maintaining a compact envelope, and the integrated flange helps distribute the load [citation:1]. With a Pitting Resistance Equivalent (PRE) typically exceeding 45, AL6XN offers exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking [citation:3][citation:4]. 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 corrosion resistance, high strength, and high torque capacity are critical. AL6XN 12 point screws are available in solution annealed condition with precision rolled threads and full traceability [citation:2][citation:4].
Complete Range of AL6XN 12 Point Screws
Aerospace 12-Point Flange Screws
AL6XN aerospace 12-point flange screws manufactured to NAS 870, NAS 871, NAS 872, and NAS 873 specifications. Designed for high-strength marine and offshore applications requiring high preload and vibration resistance. The 12-point drive provides superior torque transmission while the integrated flange provides an enlarged bearing surface [citation:1]. 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 corrosion resistance in seawater and chloride environments makes these ideal for naval aviation, offshore platforms, and marine defense systems [citation:3][citation:4].
External Wrenching 12 Point Screws
AL6XN external wrenching 12 point screws for applications requiring high torque capacity in corrosive 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 [citation:1]. The lack of recess prevents fluid or debris entrapment, making these ideal for marine and chemical processing applications [citation:3]. Ideal for confined spaces in offshore platforms, desalination plants, and chemical processing equipment where corrosion resistance is critical [citation:7].
12-Spline Flange Screws
AL6XN 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 marine structural applications, offshore equipment, and desalination plants [citation:3][citation:7]. Available in various grip lengths and thread sizes with full traceability. The 6% molybdenum content ensures exceptional resistance to pitting and crevice corrosion in seawater environments [citation:2][citation:4].
NAS 12 Point Screws
AL6XN NAS 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 corrosive 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 naval aerospace applications, marine defense systems, and offshore equipment where both corrosion resistance and high strength are required [citation:3][citation:4].
MS 12 Point Screws
AL6XN MS 12 point screws manufactured to MS 90353, MS 90354, MS 90355, and MS 90723 specifications. Used in military marine and naval applications where corrosion resistance and reliability are paramount. Available with silver or cadmium plating options per customer requirements. Full traceability and NACE MR0175 compliance available [citation:2][citation:4]. Ideal for submarine components, naval shipbuilding, and offshore defense systems.
Custom & Specialty AL6XN 12 Point Screws
Need a special head configuration, unusual grip length, or custom thread combination for your marine or offshore application? RAYCHIN engineers work with you to produce custom AL6XN 12 point screws to your drawing. Expert solution annealing (1100–1200°C followed by water quenching) precisely controlled for each batch [citation:4][citation:9]. 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 AL6XN Screws
Higher Torque Capability
The 12-point drive allows for up to 20% more torque transmission than hex heads of the same size, critical for high-strength bolting applications in corrosive environments [citation:1][citation:3].
Compact Envelope
12-point heads are generally smaller than hex heads, requiring less wrenching clearance and making them ideal for confined spaces in offshore and marine equipment where space is at a premium [citation:3].
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 marine and chemical processing applications where cleanliness is important [citation:3].
Integrated Flange
The built-in flange helps distribute the load, eliminating the need for separate washers and providing consistent bearing surface in critical applications [citation:1][citation:3].
Manufacturing Standards for AL6XN 12 Point Screws
RAYCHIN LIMITED manufactures AL6XN 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 AL6XN 12 Point Screws
To serve clients worldwide, RAYCHIN LIMITED manufactures AL6XN 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 [citation:2][citation:3][citation:4].
UNS N08367 AL6XN ASTM B691 ASTM B688 NACE MR0175 1.4501
Chemical Composition (Weight %) – AL6XN Super Austenitic Stainless Steel
Our AL6XN 12 point 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 [citation:2][citation:3][citation:4]. The high nickel and molybdenum content delivers better corrosion resistance than Duplex 2205 and Super Duplex 2507 in highly aggressive chloride environments [citation:3][citation:4].
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) [citation:2][citation:3]. The high nickel content (23.5-25.5%) provides exceptional resistance to chloride stress corrosion cracking [citation:3][citation:4]. This makes AL6XN 12 point screws ideal for offshore, desalination, and FGD applications [citation:7]. The material also meets NACE MR0175 requirements for sour service in oil and gas environments [citation:2][citation:4].
Complete Mechanical Properties of AL6XN 12 Point Screws (Solution Annealed Condition)
AL6XN 12 point screws are supplied in the solution annealed condition (1100–1200°C followed by water quenching) [citation:4][citation:9]. The data below represent typical values per ASTM B691 and manufacturer specifications [citation:3][citation:4].
Mechanical Properties at Room Temperature
High Temperature Performance of AL6XN 12 Point 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) [citation:4][citation:5]. 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 [citation:2][citation:7].
Temperature-Dependent Mechanical Properties
Note: AL6XN is not recommended for applications requiring prolonged exposure above 427°C (800°F) [citation:4]. The material maintains excellent oxidation resistance up to 500°C and retains good impact strength at cryogenic temperatures down to -196°C, with impact values of 85 ft-lb at -196°C [citation:4][citation:10].
Thermal Stability Limits
Corrosion Resistance of AL6XN 12 Point Screws
AL6XN was specifically developed for use in aggressive chloride-bearing environments, originally to combat seawater corrosion [citation:3][citation:4]. 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 [citation:2][citation:4]. The material is frequently used as a cost-effective alternative to nickel-based alloys such as C-276 in moderately corrosive conditions [citation:3][citation:9].
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. 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 [citation:7].
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 [citation:3][citation:6]. The material is approved per NACE MR0175/ISO 15156 for sour service applications in oilfield equipment [citation:2][citation:4].
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 [citation:2][citation:3].
- NACE MR0175 Compliance: AL6XN is qualified for sour service (sulfide stress cracking resistance) in oilfield equipment per NACE MR0175/ISO 15156 [citation:2][citation:4].
- Temperature Limitations: Maximum service temperature for corrosion applications is approximately 400°C. Avoid exposure to temperatures above 427°C for prolonged periods [citation:4][citation:5].
- 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 [citation:3][citation:4].
- 12-Point Design Advantage: The external wrenching design prevents fluid entrapment, reducing the risk of crevice corrosion in marine applications [citation:3].
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 12 point 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 [citation:3][citation:9].
Special focus: AL6XN 12 Point Screws for Marine, Offshore & Chemical Applications
For critical applications requiring high torque capacity and exceptional corrosion resistance, RAYCHIN offers AL6XN 12 point screws manufactured to NAS, MS, AS, and customer-specific specifications. Our capabilities include:
- Marine Applications: Seawater cooling systems, ballast water systems, firefighting systems, offshore platforms, desalination plants, shipbuilding, submarine components [citation:3][citation:7]
- Chemical Processing: High-temperature reactors, crackers, reformers, heat exchangers, thermowell assemblies, processing tanks and vessels [citation:3][citation:7]
- Flue Gas Desulfurization (FGD): Scrubbers, absorbers, ducting, and piping systems in power plants [citation:3][citation:7]
- Pulp & Paper: Bleach plants, digesters, storage tanks handling aggressive media, pulp mill bleach systems [citation:3][citation:7]
- Power Generation: FGD scrubbers, cooling water systems, nuclear power water piping, steam surface condensers [citation:3][citation:7]
- Oil & Gas: Offshore platforms, subsea equipment, refinery applications, sour service per NACE MR0175, produced water systems [citation:2][citation:3]
- Aerospace & Defense: 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
- Surface Treatments: Silver plating per AMS 2410, cadmium plating per AMS 2400, passivation per AMS 2700
- Special Processing: Shot peening, magnetic particle inspection (MPI), fluorescent penetrant inspection, ultrasonic inspection
- NACE MR0175 Compliance: Certified for sour service applications
- Custom: Special grip lengths, head configurations, and unique thread combinations per customer drawings
All AL6XN 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.
Why RAYCHIN LIMITED – The AL6XN 12 Point 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 12 point screws [citation:4][citation:9]. Every heat is verified by in-house testing and PMI verification. With 6-7% molybdenum and 24% nickel, our 12 point screws provide exceptional corrosion resistance in aggressive chloride environments [citation:2][citation:3].
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 & 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.
Custom solutions
Need a special grip length, unusual head configuration, or custom thread combination for your marine or offshore application? Our CNC turning and thread rolling departments handle short runs with agility. We also provide specialized coatings and corrosion testing per customer requirements.
Contact the AL6XN 12 point screw experts today
Request a quote for AL6XN 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 NACE MR0175 sour service applications.
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