MP35N Hex 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
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 Hex Cap Screws · Hex Head Bolts · Heavy Hex · Finished HexMP35N Hex Cap Screws: Ultra-High Strength Cobalt-Nickel Superalloy Hex Head Bolts for Extreme Environments
RAYCHIN LIMITED is a leading manufacturer of MP35N Hex Cap Screws – precision hex head 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. Hex cap screws (also known as hex head bolts) are available in finished hex and heavy hex patterns, with full or partial thread options, and conform to ASME B18.2.1, DIN 931/933, and ISO 4014/4017 standards. 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 hex cap 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 Hex Cap Screws – Types & Configurations
Heavy Hex & Finished Hex
MP35N heavy hex cap screws feature a larger hex head for higher wrenching torque, ideal for pressure vessels and flanged connections. MP35N finished hex cap screws (regular hex) are used in general assembly. Available in sizes #4 to 2½" (M3 to M64) with UNC, UNF, UNJF-3A (aerospace), and metric coarse threads. Full thread or partial thread options. Head markings optional per customer specification. Conform to ASME B18.2.1, DIN 931/933, ISO 4014/4017.
Thread Configurations
MP35N hex cap screws supplied in full thread (tap-end) and partial thread (body diameter) styles. Thread classes 2A, 3A, 6g. Lengths from 1/2" to 20" (12mm to 1000mm). Precision rolled threads for superior fatigue life and consistent fit. Custom thread lengths and diameters available upon request.
Aerospace & Military Standards
Our MP35N hex cap screws meet NAS1802 (hex head), MS16995 (reduced head), AN3 through AN20 (aircraft bolts), and MS20073 through MS20083. 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 hex cap screws 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.
Medical & Implant Grades
MP35N hex cap screws for medical applications meet ASTM F562 and ISO 5832-6 specifications for biocompatibility. Cleanroom packaging available. Used in surgical instruments, orthopedic implant systems, and prosthetic devices requiring maximum strength and corrosion resistance.
Custom & Non-Standard Hex Cap Screws
Need a special head height, extra-long length, or proprietary head markings? RAYCHIN engineers design and produce custom MP35N hex cap screws to your exact specifications – any condition (annealed, cold worked, aged), with full material traceability. Prototype to production volumes supported.
Critical Applications of MP35N Hex Cap Screws
Aerospace & Defense
MP35N hex cap screws are extensively used in jet engine casings, landing gear assemblies, flight control systems, missile structures, and space vehicles. Withstand operating temperatures up to 800°F (427°C) with exceptional corrosion resistance and fatigue strength. Tensile strength up to 300 ksi ensures structural integrity under high-G maneuvers. Heavy hex variants used in high-pressure flanged connections in hydraulic systems. Non-magnetic properties essential for sensitive instrumentation.
Oil & Gas / Downhole Tools
MP35N hex cap screws qualified per NACE MR0175 for downhole drilling tools, Measurement-While-Drilling (MWD) equipment, wellhead components, subsea actuators, and BOP assemblies. 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. Heavy hex bolts used in high-pressure flanged connections.
Medical & Surgical Implants
MP35N hex cap screws used in surgical instruments, orthopedic trauma implants, spinal fixation systems, 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. Hex head provides secure engagement in surgical tool assemblies.
Marine & Subsea
MP35N hex cap screws in seawater pump couplings, subsea connector assemblies, ROV systems, and offshore platform components resist pitting and crevice corrosion in saltwater. In seawater, MP35N is virtually immune to crevice corrosion, stress corrosion cracking, and pitting even at the highest strength levels. Heavy hex bolts used in flanged connections for subsea pipelines.
Power Generation
MP35N hex cap screws 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 800°F without relaxation. Can operate at cryogenic temperatures without embrittlement.
Chemical Processing
MP35N hex cap 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 Hex Cap Screws
RAYCHIN LIMITED manufactures MP35N hex cap 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 Hex Cap Screws
Our MP35N hex cap 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 hex cap 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 Hex Cap Screws (MPa / ksi)
MP35N hex cap 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 Hex Cap Screws
Physical Properties – MP35N Alloy
High‑Temperature Performance of MP35N Hex Cap Screws
MP35N alloy retains useful mechanical properties at elevated temperatures up to 800°F (427°C) and can operate in moderately elevated temperatures of 800°F. 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 Hex Cap 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 Hex Cap Screws
All MP35N hex cap 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 Hex Cap Screw Authority
Contact the MP35N hex cap screw experts
Request a quotation for MP35N hex cap screws, hex head bolts, heavy hex cap screws, finished hex bolts – any standard (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.
sales@ray-chin.com | +86 534 2166 566Our team provides technical support in English, German, Mandarin, Japanese.
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