MP35N Fasteners – Products, Specifications & Technical Guide

Published by RAYCHIN LIMITED · Special Alloy Fastener Manufacturer & Global Supplier

RAYCHIN LIMITED is a trusted global supplier of ultra-high-strength MP35N fasteners for critical applications in aerospace, medical, marine, and oil & gas industries. Our range includes MP35N bolts, nuts, washers, stud bolts, and custom-machined parts manufactured to international standards with full traceability. This page serves as both a product overview and a detailed technical guide to help engineers select the right fastener.

Product Range

Material Specifications & Standards

Available Sizes & Thread Standards

Larger or special sizes can be manufactured on request. Please contact our sales team for a custom quotation.

What is MP35N Alloy? (Technical Guide)

MP35N is a nickel-cobalt-chromium-molybdenum alloy with the UNS designation R30035. It was originally developed for demanding aerospace and medical applications because of its unique combination of ultra-high tensile strength, excellent corrosion resistance, and outstanding fatigue resistance. Unlike many other high-strength alloys, MP35N achieves its remarkable properties through a combination of cold working and aging, rather than relying solely on heat treatment.

The typical chemical composition of MP35N includes:

• Nickel (Ni): 33–37%
• Cobalt (Co): 33–37%
• Chromium (Cr): 19–21%
• Molybdenum (Mo): 9–10.5%
• Iron (Fe): ≤1.0%
• Titanium (Ti): ≤1.0%
• Carbon (C): ≤0.025%

This balanced composition gives MP35N its unique ability to maintain mechanical integrity in harsh environments where other materials fail.

Key Properties of MP35N Fasteners

• Ultra-High Tensile Strength: Depending on cold work level, MP35N can achieve tensile strengths exceeding 2000 MPa (290 ksi), making it one of the strongest corrosion-resistant alloys available for fasteners.
• Exceptional Corrosion Resistance: MP35N resists pitting, crevice corrosion, and stress-corrosion cracking in chloride-rich environments, seawater, and many acids, including sulfuric and hydrochloric acid.
• Superior Fatigue Resistance: The alloy’s high strength and toughness result in excellent fatigue life, critical for dynamic applications such as aerospace components and medical implants.
• Wide Temperature Range: MP35N retains its mechanical properties from cryogenic temperatures (down to -196°C / -320°F) up to approximately 450°C (840°F) in continuous service.

Applications of MP35N Fasteners

• Aerospace & Defense: Engine components, airframe fasteners, and landing gear.
• Medical: Orthopedic implants, bone screws, surgical instruments.
• Marine & Offshore: Subsea connectors, valve components, seawater-exposed fasteners.
• Oil & Gas: Downhole tools, wellhead components, sour service equipment.
• High-Performance Motorsport: Lightweight, high-strength fasteners.
• Chemical Processing: Equipment exposed to aggressive acids.

Quality Assurance & Testing

RAYCHIN LIMITED is committed to supplying MP35N fasteners that meet the highest quality standards. Our rigorous quality control includes:

• Material Test Certificates (EN 10204 3.1 / 3.2)
• Full chemical analysis and mechanical testing
• Positive Material Identification (PMI)
• Hardness testing (Rockwell C, Brinell, Vickers)
• Corrosion resistance testing (salt spray, pitting, intergranular)
• Dimensional inspection with calibrated gauges
• Third-party inspection and testing available upon request

How to Select the Right MP35N Fastener

1. Mechanical Requirements: Determine required tensile strength, yield strength, and fatigue life. Cold work levels (50%, 60%, 70%) affect final strength.
2. Corrosive Environment: Identify chemicals, temperature, and chloride concentration.
3. Standards and Certification: Specify AMS, ASTM, ISO, or NACE MR0175 if required.
4. Size and Thread: Confirm diameter, pitch, length, and thread standard.
5. Quantity and Lead Time: Stock items dispatch within 3-5 days; custom orders typically 3-6 weeks.

Frequently Asked Questions