MP35N Torx 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 Torx Screws · Star Drive · Tamper-Resistant · Pan/Flat/Button HeadMP35N Torx Screws: Ultra-High Strength Cobalt-Nickel Superalloy Star Drive Screws for Extreme Environments
RAYCHIN LIMITED is a leading manufacturer of MP35N Torx 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 Torx drive system (also known as star drive or hexalobular, per ISO 10664) features a 6-point star-shaped pattern that resists cam-out, provides better torque transfer, and reduces driver bit wear compared to Phillips or slotted drives. 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 Torx 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 Torx Screws – Design & Configurations
Torx Drive Design (Star Drive)
MP35N Torx screws feature a 6-point star-shaped pattern that provides increased torque transmission and resists cam-out (the process by which a driver slips out of the screw head). The Torx drive handles high torque and minimizes driver slippage, making it ideal for critical assemblies where tool engagement reliability is essential. The compact head style is ideal for applications with limited space. Conforms to ISO 10664, IFI115, and aerospace industry standards.
Advantages of Torx Drive
MP35N Torx screws offer several key advantages: resistant to cam-out, more difficult to strip than Phillips or hex drives, increased tamper resistance as Torx drivers are less common, and driver inserts are less susceptible to damage when over-torqued compared to Allen heads. These features ensure better torque transfer between driver and fastener while reducing wear on driver bits.
Drive & Head Styles
Available in internal Torx (standard), external Torx (E-Torx), and tamper-resistant Torx with center pin (for security applications). Head styles: pan head, flat head (82°/100° countersink), button head, socket head cap, and custom configurations. Drive sizes from T6 to T60. Sizes #2 to 1½" (M2 to M36). Precision rolled threads for superior fatigue life.
Thread Specifications
MP35N Torx screws available with Unified Coarse (UNC), Unified Fine (UNF), UNJF-3A (aerospace), and metric coarse/fine threads. Thread classes 2A, 3A, 6g. Lengths from 1/8" to 8" (3mm to 200mm). Full thread or partial thread options available. Custom thread lengths and diameters upon request.
Aerospace & Military Standards
Our MP35N Torx screws meet applicable sections of NAS, MS, and AN standards for screw dimensions and head styles. 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.
Custom & Non-Standard Torx Screws
Need a special drive size, custom head geometry, or proprietary tamper-resistant features? RAYCHIN engineers design and produce custom MP35N Torx screws to your exact specifications – any condition (annealed, cold worked, aged), with full material traceability. Prototype to production volumes supported.
Critical Applications of MP35N Torx Screws
Aerospace & Defense
MP35N Torx screws are extensively used in jet engine components, 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. Torx drive allows installation in confined engine compartments where standard drivers cannot access. Non-magnetic properties essential for sensitive instrumentation.
Oil & Gas / Downhole Tools
MP35N Torx 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. Highly resistant to hydrogen embrittlement when properly heat treated. Non-magnetic properties essential for directional drilling instrumentation.
Medical & Surgical Implants
MP35N Torx 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 Torx drive provides secure engagement and reduces risk of stripping in surgical applications.
Marine & Subsea
MP35N Torx 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.
Power Generation
MP35N Torx 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 Torx 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 Torx Screws
RAYCHIN LIMITED manufactures MP35N Torx 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 Torx Screws
Our MP35N Torx 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 Torx screws with complex drive 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 Torx Screws (MPa / ksi)
MP35N Torx 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 Torx Screws
Physical Properties – MP35N Alloy
High‑Temperature Performance of MP35N Torx 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 Torx 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 Torx Screws
All MP35N Torx 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 Torx Screw Authority
Contact the MP35N Torx screw experts
Request a quotation for MP35N Torx screws, star drive screws, tamper-resistant Torx screws – 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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