MP35N 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
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.
Request a Quote from RAYCHIN
We're here to help!
RAYCHIN LIMITED
MP35N Button Head Cap Screws · Low-Head Socket Screws · Dome HeadMP35N Button Head Cap Screws: Ultra-High Strength Cobalt-Nickel Superalloy Low-Profile Socket Screws for Extreme Environments
RAYCHIN LIMITED is a leading manufacturer of MP35N Button Head Cap Screws – precision low-profile 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. Button head cap screws (also known as dome head screws) feature a low-profile rounded head with an internal hex socket drive, providing a smooth finished appearance and reducing snag points in applications where head height is restricted. 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 7380 for metric button head screws and applicable sections of ASME B18.3 for inch series. Whether you require MP35N button head cap screws for aerospace interior assemblies, 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 Button Head Cap Screws – Design & Configurations
Button Head Design
MP35N button head cap screws feature a shallow, rounded (dome) head with a low height-to-diameter ratio, ideal for applications with clearance constraints. The smooth dome head provides a finished appearance and reduces snag points. Head dimensions conform to ASME B18.3 (inch series) and ISO 7380 (metric series). Available in both standard and reduced head heights for ultra-tight spaces.
Hex Socket Drive
Internal hex drive (Allen) provides positive torque transmission and allows for flush or recessed installations. Drive sizes from .050" to 3/8" (1.5mm to 10mm). Tamper-resistant hex drive with center pin available for security applications. Precision-formed sockets ensure consistent engagement and minimize cam-out.
Thread Specifications
MP35N button head cap screws available with Unified Coarse (UNC), Unified Fine (UNF), UNJF-3A (aerospace), and metric coarse/fine threads. Thread classes 2A, 3A, 6g. Sizes from #0 to 1" (M1.6 to M24). Precision rolled threads for superior fatigue life. Full thread standard; partial thread available for custom applications.
Aerospace & Military Standards
Our MP35N button head cap screws meet applicable sections of NAS1802 (hex head) and NAS1351/1352 (socket head) for geometry. 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 button head 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.
Custom & Non-Standard Button Head Cap Screws
Need a special head diameter, extra-long length, or proprietary drive? RAYCHIN engineers design and produce custom MP35N button head 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 Button Head Cap Screws
Aerospace & Defense
MP35N button head cap screws used in cockpit instrument panels, avionics mounting brackets, interior cabin fixtures, and missile guidance housings. Low head profile prevents interference with moving parts and allows for smooth aerodynamic surfaces. Withstand vibration and temperature extremes from -300°F to 800°F. Non-magnetic properties essential for sensitive instrumentation.
Oil & Gas / Downhole Tools
MP35N button head cap screws 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. Low head design allows installation in confined spaces of BOP control systems. Highly resistant to hydrogen embrittlement when properly heat treated.
Medical & Surgical Implants
MP35N button head 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. The smooth dome head reduces tissue irritation in implant applications.
Marine & Subsea
MP35N button head cap screws in seawater pump couplings, subsea connector assemblies, ROV systems, and offshore platform components resist pitting and crevice corrosion in saltwater. Low profile prevents snagging on fishing nets and diving equipment. In seawater, MP35N is virtually immune to crevice corrosion, stress corrosion cracking, and pitting even at the highest strength levels.
Power Generation
MP35N button head cap screws in gas turbines, steam turbines, and nuclear power systems provide reliable fastening of sensor mounts and control housings. Maintain clamping force after thousands of thermal cycles from cryogenic to 800°F without relaxation. Can operate at cryogenic temperatures without embrittlement.
Medical & Pharmaceutical Equipment
MP35N button head cap screws in medical imaging equipment, surgical robots, and clean room processing equipment. Smooth dome head allows easy cleaning and prevents bacterial accumulation. Electropolished finishes available for sterile environments.
International Standards & Global Designations – MP35N Button Head Cap Screws
RAYCHIN LIMITED manufactures MP35N button head 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 Button Head Cap Screws
Our MP35N button head 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 button head cap screws with precise head geometries and hex socket formation. 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 Button Head Cap Screws (MPa / ksi)
MP35N button head 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 Button Head Cap Screws
Physical Properties – MP35N Alloy
High‑Temperature Performance of MP35N Button Head 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 Button Head 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 Button Head Cap Screws
All MP35N button head 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 Button Head Cap Screw Authority
Contact the MP35N button head cap screw experts
Request a quotation for MP35N button head cap screws, low head socket screws, dome head screws – any standard (ISO 7380, ASME B18.3, DIN 912) – 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.
Request A Quote! We'll respond as soon as possible(within 12 hours)
Get a Quote