MP35N 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
One of the highest strength alloys available to industry
Extreme high strength properties up to 300 ksi ultimate tensile.
Good in moderately elevated temperatures of 800°F.
Moderate corrosion resistance.
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RAYCHIN LIMITED
MP35N 12 Point Screws · Double Hex Fasteners · Flange Head · IFI115MP35N 12 Point Screws: Ultra-High Strength Cobalt-Nickel Superalloy Double Hex Fasteners for Extreme Environments
RAYCHIN LIMITED is a leading manufacturer of MP35N 12 Point Screws – precision fasteners engineered from cobalt-nickel-chromium-molybdenum multiphase superalloy, delivering the ultimate combination of ultra-high strength, exceptional corrosion resistance, and reliable performance in the most demanding applications. The 12-point head design (also known as double hex or ferry cap screw) features a flanged underside and two overlapping hexagon shapes, creating 12 points of contact that provide higher torque capability compared to socket head cap screws while maintaining a smaller head profile for weight-critical and space-constrained installations. Through precise cold working and age hardening, MP35N achieves ultimate tensile strength up to 300 ksi (2070 MPa) while maintaining excellent ductility and toughness. Our portfolio includes all standard and custom configurations manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS standards. Whether you require MP35N 12 point screws for aerospace critical joints, downhole drilling tools, or medical devices, RAYCHIN delivers precision, quality, and full traceability. All mechanical properties are presented in MPa and ksi (kilopound per square inch).
MP35N 12 Point Screws – Design & Configurations
12 Point Head Design (Double Hex)
MP35N 12 point screws feature a double hexagon head configuration with 12 lobes and a flanged underside, allowing for 50% more engagement points than standard 6-point hex bolts. This design enables higher torque application with reduced risk of rounding or stripping, particularly critical in confined spaces where socket access is limited. The driver uses two overlapped hexagon shapes creating 12 points, also referred to as ferry cap screws or 12 point flange screws. Available with relieved shank, short-thread, and full-thread variants.
Advantages of 12 Point Design
MP35N 12 point screws offer several key advantages: higher torque capability compared to socket head cap screws; lack of recess to trap fluid or debris (ideal for clean environments); and smaller head profile than hex head bolts, saving weight and enabling installation in tight spaces where other fasteners cannot fit. The design resists cam-out and provides better torque transfer between driver and fastener.
Thread Specifications
MP35N 12 point bolts available with Unified Coarse (UNC), Unified Fine (UNF), UNJF-3A (aerospace), and metric coarse/fine threads. Thread classes 2A, 3A, 6g. Sizes from #2 to 1½" (M2 to M36). Precision rolled threads for superior fatigue life. Relieved shank and short-thread options available for weight reduction in aerospace applications.
Aerospace & Military Standards
Our MP35N 12 point screws meet IFI115 (12-point flange head), NAS1802, NAS1351/1352 (applicable head dimensions), and MS standards. Full compliance with AMS 5844 (solution treated and work strengthened), AMS 5845 (full condition - cold worked and aged), and AMS 5758 (solution treated) for material and heat treatment. Silver plating per AMS 2410 available for anti-galling and high-temperature anti-seize.
Industrial & Petrochemical Grades
MP35N 12 point fasteners for oil & gas, chemical processing, and power generation manufactured to NACE MR0175/ISO 15156-3 specifications. NACE MR0175 allows hardness up to 51 HRC for material that has been work strengthened and aged, with certified tensile strengths of 220 ksi (1517 MPa) and yield strengths of 210 ksi (1448 MPa) when aged at 1300°F/4 hrs. Supplied with EN 10204 3.1/3.2 certifications and full NDT (PMI, UT, MPI) upon request.
Custom & Non-Standard 12 Point Screws
Need a special head height, extra-long length, proprietary drive, or custom coatings? RAYCHIN engineers design and produce custom MP35N 12 point screws to your exact specifications – any condition (annealed, cold worked, aged), with full material traceability. Prototype to production volumes supported.
Critical Applications of MP35N 12 Point Screws
Aerospace & Defense
MP35N 12 point screws are extensively used in jet engine components, landing gear assemblies, flight control systems, missile structures, and space vehicles. Withstand operating temperatures up to 600°F (315°C) with exceptional corrosion resistance and fatigue strength. The 12-point head allows installation in confined engine compartments where standard sockets cannot access. Non-magnetic properties essential for sensitive instrumentation.
Oil & Gas / Downhole Tools
MP35N 12 point bolts qualified per NACE MR0175 for downhole drilling tools, Measurement-While-Drilling (MWD) equipment, wellhead components, subsea actuators, and completion equipment. Resist sulfide stress cracking (SSC) and pitting in H₂S/CO₂ environments at elevated pressures and temperatures. Highly resistant to hydrogen embrittlement when properly heat treated. Non-magnetic properties essential for directional drilling instrumentation.
Medical & Surgical Implants
MP35N 12 point screws used in surgical instruments, orthopedic trauma implants, and prosthetic devices. Full biocompatibility per ASTM F562 and ISO 5832-6, excellent fatigue resistance for long-term cyclic loading, and non-magnetic properties for MRI compatibility. The 12-point flange head provides secure engagement in confined surgical access.
Marine & Subsea
MP35N 12 point screws in seawater pump couplings, subsea connector assemblies, ROV systems, and offshore platform components resist pitting and crevice corrosion in saltwater. Virtually immune to seawater stress corrosion cracking and pitting even at the highest strength levels. In seawater, MP35N is virtually immune to crevice corrosion, stress corrosion cracking, and pitting.
Power Generation
MP35N 12 point fasteners in gas turbines, steam turbines, and nuclear power systems provide reliable fastening of casings, flanges, and support structures. Maintain clamping force after thousands of thermal cycles from cryogenic to 600°F without relaxation. Can operate at cryogenic temperatures without embrittlement.
Chemical Processing
MP35N 12 point screws resist most mineral acids (nitric, hydrochloric, sulfuric), hydrogen sulfide, and aggressive chemical environments. Excellent resistance to sulfidation and high-temperature oxidation. Used in reactor agitators, pump shafts, and valve assemblies requiring maximum corrosion resistance and strength.
International Standards & Global Designations – MP35N 12 Point Screws
RAYCHIN LIMITED manufactures MP35N 12 point screws from vacuum induction melted (VIM) and vacuum arc remelted (VAR) material conforming to the most widely used national and international specifications. All material is traceable to the mill.
Chemical Composition (Weight %) – MP35N Alloy for 12 Point Screws
Our MP35N 12 point screws are produced from vacuum induction melted (VIM) and vacuum arc remelted (VAR) material conforming to the following limits per AMS, ASTM, and industry standards.
Metallurgical note: MP35N is a multiphase cobalt-nickel-chromium-molybdenum alloy strengthened through a unique combination of solid solution strengthening, cold work hardening (typically 40-60% reduction), and age hardening via precipitation of Co₃Mo phase. The alloy maintains excellent ductility even at high cold reduction levels, enabling production of high-strength 12 point screws with complex head geometries. It remains essentially non-magnetic (permeability <1.005 μ) even after extensive cold working, critical for medical and directional drilling applications. High-temperature (1350-1500°F) heat treatments improve hydrogen embrittlement resistance while maintaining high strength.
Complete Mechanical & Physical Properties – MP35N 12 Point Screws (MPa / ksi)
MP35N 12 point screws are supplied in various conditions per AMS and ASTM specifications. Data represent typical values based on AMS, ASTM, and industry standards. ksi values (kilopound per square inch) are provided alongside MPa.
Mechanical Properties by Condition – MP35N 12 Point Screws
Physical Properties – MP35N Alloy
High‑Temperature Performance of MP35N 12 Point Screws
MP35N alloy retains useful mechanical properties at elevated temperatures up to 600°F (315°C) and can operate in moderately elevated temperatures up to 800°F (427°C). The alloy can operate at cryogenic temperatures without embrittlement.
Elevated Temperature Capabilities
High-Temperature Comparison with Competing Alloys
Note: For applications above 800°F (427°C), consider nickel-based superalloys like Inconel 718 or MP159. MP35N excels in applications requiring maximum strength at moderate temperatures with exceptional corrosion resistance.
Exceptional Corrosion Resistance of MP35N 12 Point Screws
MP35N alloy offers outstanding corrosion resistance across a wide range of aggressive environments, making it suitable for the most demanding applications including medical implants, downhole tools, marine equipment, and chemical processing.
- General Corrosion Resistance: Excellent resistance to most mineral acids (nitric, hydrochloric, sulfuric), hydrogen sulfide, seawater and salt spray environments.
- Stress Corrosion Cracking (SCC): Exceptional resistance to chloride and sour (H₂S) environments. Qualified per NACE MR0175 for oil & gas applications with hardness up to 51 HRC.
- Pitting and Crevice Corrosion: Superior resistance to localized corrosion in seawater and brine solutions. Virtually immune to crevice corrosion and pitting even at the highest strength levels.
- Hydrogen Embrittlement: Excellent resistance to hydrogen embrittlement when properly heat treated. High-temperature aging (1350-1500°F) improves hydrogen embrittlement resistance while maintaining high strength.
- Sulfidation & High-Temperature Oxidation: Exceptional resistance to sulfidation and high-temperature oxidation environments.
- Seawater Performance: In seawater, MP35N is virtually immune to crevice corrosion, stress corrosion cracking, and pitting.
- Biocompatibility: Fully biocompatible per ASTM F562 and ISO 5832-6 for medical implant applications.
- Bimetallic Corrosion: Can be safely connected to 400 series stainless steel, 300 series stainless steel, titanium and titanium alloys, and copper alloys with appropriate precautions.
Corrosion Performance Ratings
Manufacturing Standards – MP35N 12 Point Screws
All MP35N 12 point screws are manufactured and tested to meet the following standards:
We offer surface finishes: passivation (ASTM A967), silver plating (AMS 2410 for anti‑seize), PTFE coating, electropolish. Full traceability and destructive/non‑destructive testing available (UT, MPI, PMI). ISO 13485 certified for medical applications with cleanroom packaging available.
Why RAYCHIN LIMITED – The MP35N 12 Point Screw Authority
Contact the MP35N 12 point screw experts
Request a quotation for MP35N 12 point screws, double hex bolts, 12 point flange head screws – any standard (IFI115, NAS, MS, AN, ANSI, ASTM, ASME, API, NACE, ISO, DIN, KS) – any condition (AMS 5758, 5844, 5845), any quantity. Global delivery. Mechanical data in MPa/ksi available for all products.
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