MP35N Studs
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 Studs · Threaded Studs · Double-End / Fully Threaded · Inch / Metric · AMS 5844 / 5845 / 5758MP35N Studs: Ultra-High Strength Cobalt-Nickel Alloy Threaded Studs for Flange & Clamp Connections
RAYCHIN LIMITED is a leading manufacturer of MP35N Studs – precision threaded 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. Studs (also known as threaded studs or double-end studs) are headless fasteners threaded on one end (tap-end) or both ends, designed for permanent installation in flanges, pressure vessels, and high-integrity clamped joints. 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, including ISO 898-1 for metric studs and ASME B18.31.2 for inch series. Whether you require MP35N studs for aerospace engine mounts, 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 Studs – Design & Configurations
Double-End Studs
MP35N double-end studs feature threads on both ends with an unthreaded center section. Typically used in flange connections: the tap-end (shorter thread) is installed permanently into a blind tapped hole, while the nut-end (longer thread) receives a nut for clamping. Precision machined to ASME B16.5 and API 6A flange standards. Available in all diameters #0 to 1½" (M1.6 to M36).
Fully Threaded Studs
MP35N fully threaded studs (threaded rods) are continuous threads along the entire length. Ideal for through-hole applications, adjustable connections, and custom-length installations. Rolled threads for superior fatigue life. Lengths up to 2000mm or 80". Supplied with two nuts per ASTM A194 or equivalent.
Tap-End Studs
MP35N tap-end studs have one end threaded with a tap fit (class 5H interference) for permanent installation into tapped holes, and the other end with a class 2A/3A thread for nut engagement. Used extensively in high-pressure fluid end blocks and downhole tools. Custom thread lengths available.
Aerospace & Military Standards
Our MP35N studs meet applicable sections of NASM 8830 (studs, steel, metric and inch), NAS1802, and MS16995 for geometry. Full compliance with AMS 5844, AMS 5845, and AMS 5758 for material and heat treatment. Silver plating per AMS 2410 available for anti-galling.
Oil & Gas / NACE Grades
MP35N studs for sour service manufactured to NACE MR0175/ISO 15156-3 and NACE MR0103 specifications. NACE MR0175 allows hardness up to 51 HRC for work-strengthened and aged material, with certified tensile strengths up to 220 ksi (1517 MPa). Supplied with EN 10204 3.1/3.2 certifications and full NDT (PMI, UT, MPI) upon request.
Custom & Non-Standard Studs
Need a special thread combination, extra-long length, proprietary thread form, or reduced shank? RAYCHIN engineers design and produce custom MP35N studs to your exact specifications – any condition (annealed, cold worked, aged), with full material traceability. Prototype to production volumes supported.
Critical Applications of MP35N Studs
Aerospace & Defense
MP35N studs used in aircraft engine mounts, landing gear assemblies, flight control linkages, and structural airframe joints. Withstand extreme vibration, thermal cycling from -300°F to 800°F, and high static loads. Non-magnetic properties essential for sensitive instrumentation.
Oil & Gas / Downhole Tools
MP35N studs qualified per NACE MR0175 for downhole drilling tools, MWD/LWD equipment, wellhead connectors, BOP stacks, and subsea trees. Resist sulfide stress cracking (SSC) and pitting in H₂S/CO₂ environments at elevated pressures. Double-end studs provide reliable flange sealing in high-pressure systems.
Medical & Surgical Implants
MP35N studs used in surgical instruments, orthopedic external fixators, dental implants, and prosthetic devices. Full biocompatibility per ASTM F562 and ISO 5832-6, excellent fatigue resistance for long-term cyclic loading, and non-magnetic for MRI compatibility.
Marine & Subsea
MP35N studs in seawater pump flanges, subsea connector assemblies, ROV systems, and offshore platform components resist pitting and crevice corrosion in saltwater. Flange studs provide leak-free connections in deepwater environments. Virtually immune to crevice corrosion and pitting even at highest strength levels.
Power Generation
MP35N studs in gas turbines, steam turbines, and nuclear reactor internals provide reliable fastening of casing flanges and sensor mounts. Maintain clamping force after thousands of thermal cycles from cryogenic to 800°F without relaxation.
Chemical Processing
MP35N studs in high-pressure reactor flanges, pump casings, and valve bonnets resist most mineral acids, hydrogen sulfide, and chloride solutions. Smooth thread profile prevents galling and eases maintenance.
International Standards & Global Designations – MP35N Studs
RAYCHIN LIMITED manufactures MP35N studs 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 Studs
Our MP35N studs 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 studs with precision rolled threads. 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 Studs (MPa / ksi)
MP35N studs 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 Studs
Physical Properties – MP35N Alloy
High‑Temperature Performance of MP35N Studs
MP35N alloy retains useful mechanical properties at elevated temperatures up to 800°F (427°C) and can operate in moderately elevated temperatures. The alloy can operate at cryogenic temperatures without embrittlement.
Elevated Temperature Capabilities
High-Temperature Comparison
Note: For applications above 800°F (427°C), consider nickel-based superalloys like Inconel 718. MP35N excels in applications requiring maximum strength at moderate temperatures with exceptional corrosion resistance.
Exceptional Corrosion Resistance of MP35N Studs
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.
- 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.
Manufacturing Standards – MP35N Studs
All MP35N studs 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 Stud Authority
Contact the MP35N stud experts
Request a quotation for MP35N studs, double-end studs, fully threaded studs – any standard (ISO 898-1, ASME B18.31.2, DIN 835, NAS) – any condition (AMS 5758, 5844, 5845), any quantity. Global delivery. Mechanical data in MPa/ksi available for all products.
sales@ray-chin.com | +86 534 2166 566Our team provides technical support in English, German, Mandarin, Japanese.
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