When your design pushes the boundaries of extreme stress, temperature, and corrosion, standard solutions fall short. MP159® fasteners are engineered to excel where others cannot, offering an unparalleled combination of ultra-high strength, exceptional toughness, and good corrosion resistance.

1. Advanced Chemical Composition
MP159 is a multiphase cobalt-nickel-chromium alloy strengthened by a unique combination of cold work and precipitation hardening. Its complex chemistry is key to its performance:

• Cobalt (Co): Balance

• Nickel (Ni): 25-27%

• Chromium (Cr): 18-20%

• Iron (Fe): 8-10%

• Molybdenum (Mo): 6-8%

• Columbium (Nb) + Tantalum (Ta): 0.3-0.7%

• Titanium (Ti): 2.5-3.3%

• Aluminum (Al): 0.1-0.3%
  This sophisticated alloying creates a microstructure capable of sustaining extreme loads.

2. Extraordinary Mechanical Properties
MP159 achieves its legendary status through a proprietary thermomechanical processing sequence:

• Ultimate Tensile Strength: >300 ksi (2068 MPa), often reaching 300-310 ksi in fastener forms.

• Yield Strength (0.2% Offset): >260 ksi (1790 MPa).

• Elongation: Typically 6-10%, remarkable for its strength level.

• Exceptional Fatigue Strength and superior Fracture Toughness compared to other alloys at similar strength levels.

• Maintains properties at elevated temperatures up to 800°F (427°C) and down to cryogenic levels.

3. Key Material & Industry Standards
MP159 fasteners are produced under strict controls to meet critical specifications:

• AMS 5842: The primary Aerospace Material Specification governing bars, forgings, and rings.

• ASTM F562 (Modified): Often referenced, though MP159 properties exceed the standard MP35N scope.

• Compliant with DFARS and sourced to meet aerospace OEM requirements (e.g., Boeing, Airbus, GE, Pratt & Whitney).

4. Critical Application Fields
MP159 is specified for the most demanding applications across industries:

• Aerospace Jet Engines: Critical turbine shaft bolts, compressor bolts, and high-stress fasteners in hot sections.

• High-Performance Racing & Automotive: Turbocharger systems, connecting rods, and suspension components.

• Oil & Gas Downhole Tools: Fasteners for deep-well drilling equipment requiring resistance to H₂S and extreme pressure.

• Defense & Space: Structural components in missiles, rockets, and aircraft under severe dynamic loads.

5. Strategic Advantages & Value Proposition
Choosing MP159 is an investment in absolute reliability and performance:

• Best-in-Class Strength & Toughness Combo: Unmatched ability to withstand high tensile and shear loads without brittle failure.

• Weight Savings: Allows for downsizing of components without sacrificing safety margin, reducing overall system weight.

• High Temperature Capability: Retains a significant percentage of its room-temperature strength well above 600°F (315°C).

• Good General Corrosion Resistance: Suitable for many aggressive environments, though not equal to MP35N in all chloride media.

Technical & Commercial Guide

MP159 Fasteners Chart: Key Property Summary

Understanding MP159 Fasteners Price
The MP159 fasteners price reflects its advanced metallurgy, complex processing, and supreme performance. While it commands a premium over standard alloys like A286 or even MP35N, its value is realized through:

• Enabling radical design innovation in weight-critical and performance-critical systems.

• Eliminating in-service failures, reducing downtime, and preventing catastrophic costs.

• Extending service life in harsh environments, offering a lower total cost of ownership.
  Contact us for a detailed quote tailored to your specific part number, quantity, and quality requirements. We provide cost-effective solutions for prototype through production volumes.

Specify with Confidence
For missions where failure is not an option, specify MP159. Partner with us to integrate this elite material into your breakthrough designs. Let's discuss how MP159 fasteners can become the cornerstone of your product's reliability.

*MP159® is a registered trademark of Latrobe Specialty Metals, Inc., and/or its related companies. Properties and pricing are for reference and may vary based on part geometry, processing, and quantity. Consult our engineering team for application-specific validation.*