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MP159 Fasteners

MP159 Fasteners As aerospace engineering advances, so must the materials to meet the technological requirements of this industry. Fasteners made from MP159 have been developed to provide a solution to high temperature, high strength components. MP159 fasteners offer strength capabilities similar to other Cobalt Alloys (MP35N) but can be used at much higher temperatures - up to 1100°F, compared to MP35N’s usable limit of 800F. In addition, MP159, can be used beyond 1100°F in short term situations.

RAYCHIN SPECIALTY METALS FASTENERS: BOLTS, NUTS, SCREWS, WASHERS, STUDS, THREADED RODS, U-BOLT, J-BOLTS

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Ultra-strength combined with extreme temperature capabilities
Extreme high strength properties up to 275 ksi ultimate tensile.
Maintains superior strength to 1100°F.

Key Benefits

High ultimate tensile strength of 275 ksi and yield strength of 265 ksi (Cold Worked and Age Hardened) combined with excellent ductility and toughness
Similar corrosion resistance compared to MP35N which is usable in mineral acids, hydrogen sulfide, seawater and salt spray environments.
Excellent fatigue resistance and creep strength at elevated temperatures.
Excellent resistance to crevice corrosion, stress corrosion cracking and hydrogen embrittlement.

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RAYCHIN LIMITED

Name: MP159 Fasteners
SKU: 0

MP159 Fasteners · Bolts · Nuts · Screws · Washers · Stud Bolts · Threaded Rods · AMS 5841 / 5842 / 5843

MP159 Fasteners: Ultra-High Strength Cobalt-Nickel Superalloy Bolts, Nuts, Screws, Washers, Stud Bolts & Threaded Rods for Extreme Environments

MP159 (UNS R30159) | AMS 5841 / 5842 / 5843 | Co-Ni-Cr Multiphase Alloy

RAYCHIN LIMITED is a leading manufacturer of MP159 Fasteners – precision fasteners engineered from cobalt-nickel-chromium-based multiphase superalloy, delivering the ultimate combination of ultra-high strength, exceptional corrosion resistance, and reliable performance in the most demanding applications. Our comprehensive range includes MP159 bolts (hex head, socket head, heavy hex), MP159 nuts (hex, heavy hex, lock, slotted), MP159 screws (socket cap, flat head, button head), MP159 washers (flat, lock, spring), MP159 stud bolts (double-end, fully threaded), and MP159 threaded rods. Through precise cold working and age hardening, MP159 achieves ultimate tensile strength exceeding 1830 MPa (265 ksi) 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 MP159 fasteners 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).

MP159 fastenersMP159 boltsMP159 nutsMP159 screwsMP159 washersMP159 stud boltsMP159 threaded rodsUNS R30159 fastenersAMS 5841 boltsAMS 5842 fastenersAMS 5843 threaded rodscobalt nickel alloy fastenersultra high strength fastenersnon-magnetic boltsaerospace fastenersdownhole tool fastenersoil and gas fastenershigh temperature fastenerscorrosion resistant fastenersMP159 vs MP35N

MP159 Fasteners – Complete Range of Types & Configurations

MP159 Bolts

MP159 bolts available in hex head (finished hex, heavy hex), socket head cap (ASME B18.3, DIN 912), and flange head configurations. Sizes #2 to 1½" (M2 to M36). UNC, UNF, UNJF-3A, metric threads. Full thread or partial thread options. Conform to AMS 5843 for solution treated, cold worked and aged condition with minimum tensile strength 260 ksi (1790 MPa). Ideal for aerospace structural joints, landing gear, and high-performance racing.

MP159 Nuts

MP159 nuts include hex nuts, heavy hex nuts, jam nuts, lock nuts (all-metal prevailing torque), slotted nuts, and castle nuts. Sizes #2 to 1½" (M2 to M36). Conform to ASME B18.2.2, DIN 934, ISO 4032. Available in solution annealed or age-hardened condition. Nuts are precision tapped to ensure Class 2B/3B fit with mating bolts. Ideal for critical fastening in aerospace and downhole applications.

MP159 Screws

MP159 screws include socket head cap screws, flat head screws (82°/100°), button head screws, and set screws (cup point, flat point). Precision rolled threads. Sizes #0 to 1" (M1.6 to M24). Conform to DIN 912, ISO 4762, ASME B18.3. Used in applications requiring the highest strength-to-weight ratio and corrosion resistance.

MP159 Washers

MP159 washers include flat washers (ANSI B18.22.1, DIN 125, ISO 7089), split lock washers (ASME B18.21.1, DIN 127), and spring washers (Belleville, curved). Sizes #2 to 1½" (M2 to M36). Custom stampings available. Provide load distribution and locking capability in extreme environments.

MP159 Stud Bolts

MP159 stud bolts (double-end and fully threaded) with equal or unequal thread lengths. Conform to AMS 5843, API 20F. Available with two heavy hex nuts. Sizes #4 to 1½" (M3 to M36). NACE MR0175 compliant for sour service. Ideal for flanged connections in downhole tools and subsea equipment operating up to 650°C (1200°F).

MP159 Threaded Rods

MP159 threaded rods (fully threaded continuous rod) available in standard lengths up to 3m (10ft) or custom cut-to-length. Sizes #4 to 1" (M3 to M24). UNC, UNF, metric threads. Precision rolled threads for superior fatigue life. Ideal for custom fastening solutions in high-temperature, corrosive environments.

Critical Applications of MP159 Fasteners

Aerospace & Defense

MP159 fasteners are extensively used in jet engine components, landing gear systems, missile and rocket components, and aircraft structural assemblies. Withstand operating temperatures up to 650°C (1200°F) with exceptional creep resistance and fatigue strength. MP159 is the preferred material for critical aerospace fasteners requiring both ultra-high strength and corrosion resistance.

Oil & Gas / Downhole Tools

MP159 fasteners qualified per NACE MR0175 for downhole drilling tools, Measurement-While-Drilling (MWD) equipment, wellhead components, and subsea actuators. Resist sulfide stress cracking (SSC) and pitting in H₂S/CO₂ environments at elevated pressures and temperatures. Non-magnetic properties essential for directional drilling instrumentation.

Medical Technology

MP159 fasteners used in surgical instruments, medical implants, and diagnostic equipment. Biocompatible, non-magnetic, and resistant to body fluids. High fatigue strength ensures long-term reliability in load-bearing orthopedic applications.

Power Generation

MP159 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 650°C without relaxation.

Marine & Offshore

MP159 fasteners in seawater pump couplings, propeller shaft locking devices, and subsea control modules resist pitting and crevice corrosion in saltwater. Non-magnetic properties ideal for underwater navigation systems.

High-Performance Automotive

MP159 fasteners used in motorsports and aerospace-derived automotive systems where maximum strength and minimum weight are critical. Racing engine components, transmission systems, and suspension linkages benefit from MP159's ultra-high strength and fatigue resistance.

International Standards & Global Designations – MP159 Fasteners

RAYCHIN LIMITED manufactures MP159 fasteners from material conforming to the most widely used national and international specifications. All material is traceable to the mill.

Designation	Standard / Specification	Description
UNS R30159	Unified Numbering System	Standard designation for MP159 alloy chemistry
AMS 5841	Aerospace Material Specification	Bar, rod, wire; solution heat treated (1040-1055°C, 4-8h, water quench)
AMS 5842	Aerospace Material Specification	Bar, rod, wire; solution heat treated and work strengthened (cold worked ~48%)
AMS 5843	Aerospace Material Specification	Bar, rod, wire; solution heat treated, work strengthened, and aged (650-675°C, 4-4.5h, air cool) – full condition for maximum strength
ASTM F562	Standard Specification	Wrought nickel-cobalt alloy bar for surgical implants (modified for MP159 composition)
GE S-400 / S1000	GE Aviation Specification	Approved for critical aerospace applications
RR SABRe Edition 2	Rolls-Royce Specification	Approved for aerospace applications
PWA LCS	Pratt & Whitney Specification	Approved for aerospace applications

UNS R30159 AMS 5841 AMS 5842 AMS 5843 ASTM F562 NACE MR0175 API 20F GE S-400

Chemical Composition (Weight %) – MP159 Alloy for Fasteners

Our MP159 fasteners are produced from melts conforming to the following limits per AMS and industry standards.

Element	Min %	Max %	Typical
Cobalt (Co)	33.0	37.0	35.7
Nickel (Ni)	24.0	27.0	25.5
Chromium (Cr)	18.0	20.0	19.0
Iron (Fe)	8.0	10.0	9.0
Molybdenum (Mo)	6.5	7.5	7.0
Titanium (Ti)	2.5	3.5	3.0
Niobium (Nb)	0.3	0.9	0.6
Aluminum (Al)	0.1	0.3	0.2
Carbon (C)	—	0.03	0.01
Sulfur (S)	—	0.015	0.005
Phosphorus (P)	—	0.015	0.008
Silicon (Si)	—	0.15	0.10
Manganese (Mn)	—	0.15	0.10
Boron (B)	0.005	0.020	0.012

Metallurgical note: MP159 is a multiphase cobalt-nickel-chromium alloy strengthened through a combination of cold work and age hardening. The alloy develops its ultra-high strength through cold deformation (typically 48% reduction) which induces a strain-induced martensitic transformation (γ → ε), followed by aging at 650-675°C to precipitate fine Ni₃(Al, Ti) L1₂ particles. This unique strengthening mechanism enables tensile strengths exceeding 1830 MPa (265 ksi) while maintaining good ductility and toughness. The alloy remains non-magnetic (permeability <1.00265) even after cold working.

Complete Mechanical & Physical Properties – MP159 Fasteners (MPa / ksi)

MP159 fasteners are supplied in various conditions per AMS 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 – MP159 Fasteners

Condition / Specification	Tensile Strength (MPa)	Tensile Strength (ksi)	Yield Strength 0.2% (MPa)	Yield Strength 0.2% (ksi)	Elongation (%)	Hardness
Annealed (AMS 5841)	848	123	400	58	60	20 HRC max
Cold Worked 48% (AMS 5842)	1586	230	1413	205	12	≥38 HRC
Cold Worked + Aged (AMS 5843)	1790-2070	260-300	1655-1790	240-260	8-12	44-48 HRC

Physical Properties – MP159 Alloy

Property	Metric	Imperial	Notes
Density	8.33 g/cm³	0.301 lb/in³
Melting Point	1427°C	2600°F
Elastic Modulus (at 232°C)	208 GPa	30,200 ksi
Shear Modulus (at 232°C)	75.8 GPa	11,000 ksi
Thermal Expansion (25-100°C)	14.3 µm/m°C	7.94 µin/in°F
Magnetic Permeability	1.00265		Non-magnetic

High‑Temperature Performance of MP159 Fasteners

MP159 superalloy retains significant strength at elevated temperatures, making MP159 fasteners ideal for gas turbine hot section components and other high-temperature applications. The alloy was specifically developed to perform under higher operating temperatures required for turbine engines.

Elevated Temperature Capabilities

Property	Value	Notes
Maximum Service Temperature (continuous)	593-650°C (1100-1200°F)	Can perform in applications up to 650°C
Short-term Use Temperature	Exceeds 650°C	Suitable for short-term exposure at even higher temperatures
Yield Strength at 650°C	~900 MPa (130 ksi)	Estimated retention of high-temperature strength
Creep Resistance	Excellent	Superior creep strength at elevated temperatures

Dynamic Performance Characteristics

Recent research demonstrates that MP159 exhibits extraordinary strength-ductility synergy over a wide strain rate range (10⁻⁴/s – 10³/s). When strain rate increases from quasi-static to dynamic (1500/s), yield strength increases from ~850 MPa to ~1155 MPa while elongation remains around 30%, enabled by nanotwin and stacking fault deformation mechanisms. This makes MP159 ideal for high-speed dynamic loading conditions in aerospace applications.

Exceptional Corrosion Resistance of MP159 Fasteners

MP159 alloy offers outstanding corrosion resistance comparable to MP35N®, making it suitable for the most aggressive environments.

General Corrosion Resistance: Excellent resistance to inorganic acids, seawater, and salt spray environments. Maintains passive film stability in chloride-containing media.
Stress Corrosion Cracking (SCC): Exceptional resistance to stress corrosion cracking in chloride and sour (H₂S) environments. Qualified per NACE MR0175 for oil & gas applications.
Pitting and Crevice Corrosion: Superior resistance to localized corrosion in seawater and brine solutions. No evidence of crevice corrosion or pitting in ferric chloride tests.
Hydrogen Embrittlement: Excellent resistance to hydrogen embrittlement. Salt wipe tests show no damage or cracking.
High-Temperature Oxidation: Forms protective oxide scale at elevated temperatures, maintaining integrity up to 650°C service.

Manufacturing Standards – MP159 Fasteners

All MP159 fasteners are manufactured and tested to meet the following standards:

AMS 5841 (Solution Treated)AMS 5842 (Work Strengthened)AMS 5843 (Full Condition)ASTM F562 (Medical)NACE MR0175 / ISO 15156API 20FGE S-400 / S1000RR SABRe Edition 2PWA LCSNAS (NAS1802, NAS1351, NAS1352)MS (MS16995, MS20073-20083)AN (AN3-AN20, AN42-AN73)ANSI B18.2.1, B18.2.2, B18.3ISO 4014, 4032, 4762, 7089DIN 931, 933, 934, 912, 125KS B1002, B1003, B1020EN 10204 3.1/3.2

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).

Why RAYCHIN LIMITED – The MP159 Fastener Authority

Metallurgical expertise: Decades of experience with cobalt‑nickel superalloys. We ensure precise heat treatment: solution anneal (1040-1055°C), cold work optimization (48% reduction), and aging (650-675°C) per AMS 5843 schedules. In‑house PMI verifies chemistry of every heat. Our MP159 fasteners achieve 260-300 ksi ultimate tensile strength with full traceability.

Global certifications: ISO 9001, AS9100D, PED, API Q1, NADCAP accredited processes. All fasteners supplied with EN 10204 3.1/3.2 certifications, NACE compliance when required.

Precision forming & threading: CNC cold heading and thread rolling ensure consistent geometry, accurate drives, and Class 2A/3A thread fit. 100% inspection available. Proprietary thread rolling in aged condition ensures optimal fatigue performance.

Custom solutions: Special head dimensions, proprietary drives, non‑standard lengths, and tailored packaging. We support urgent delivery and JIT programs. In-house metallurgical laboratory and finite element analysis for design optimization.

Contact the MP159 fastener experts

Request a quotation for MP159 fasteners, bolts, nuts, screws, washers, stud bolts, threaded rods – any standard (NAS, MS, AN, ANSI, ASTM, ASME, API, NACE, ISO, DIN, KS) – any condition (AMS 5841, 5842, 5843), any quantity. Global delivery. Mechanical data in MPa/ksi available for all products.

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