Lock washers work by preventing the bolt from rotating. There are many different types of lock washers, including:

• Split washers

Also known as helical lock washers, these washers have two uneven ends that bite into the fastener to keep it from turning.

• Internal-tooth washers

These washers have teeth on the inside of the ring that make contact with the fastener near the head.

• External-tooth washers

These washers have teeth on the outside of the ring and are better suited for fasteners with large heads.

• Retaining washers

These washers have internal teeth that grip the screw shank.

• Sealing washers

Also known as tap washers, these washers create a seal between the screw head and the surface it's fastened to.

The effectiveness of a lock washer depends on its size and fit. The inside diameter of the lock washer should closely match the diameter of the bolt.

RAYCHIN LIMITED, we are materials experts who focus only on fasteners made from the highest performance specialty metals for the most challenging and extreme applications.

• Stainless Steel Series: Martensitic Stainless Steel, Ferritic Stainless Steel, Austenitic Stainless Steel, Austenitic-Ferritic (Duplex) Stainless Steel and Precipitation Hardening Stainless Steel.

• Super Alloys Series: Nickel-based Alloy, Cobalt-based Alloy, Iron-based Alloy, Molybdenum-based Alloy, ‌Titanium-based Alloy, Copper based Alloy, ‌Zirconium Alloy.

• Alloy Steel Series: Low Alloy Steel, Medium Alloy Steel, High Alloy Steel, Special Alloy Steel.

Precision Lock Washers in Special Alloys | RAYCHIN Fastening Solution Expert

RAYCHIN manufactures precision lock washers in 25+ exotic alloys: 17-4 PH, Inconel 718, Titanium, Hastelloy, MP35N, A286, Monel & more. Split lock washers, tooth lock washers, wave washers. ASME, DIN, ISO compliant. Custom OEM lock washers for aerospace, automotive, marine & industrial applications. Global supplier.

Lock Washers: Engineered for Vibration-Resistant Connections

RAYCHIN is a premier manufacturer of high-performance lock washers and a recognized special alloy fastening solution expert. Lock washers are specialized fasteners designed to prevent bolted connections from loosening under vibration, thermal cycling, and dynamic loads. Unlike plain washers, lock washers incorporate mechanical features that create friction, increase tension, or provide positive locking between the fastener and mating surface. These critical components are essential in aerospace, automotive, rail transportation, industrial machinery, marine equipment, and defense applications where fastener loosening could lead to catastrophic failure.

The primary functions of lock washers include:

• Vibration Resistance: Preventing rotational loosening under dynamic conditions

• Increased Friction: Creating additional friction between the nut/bolt head and mating surface

• Spring Tension: Maintaining tension despite thermal expansion or settling

• Compensation: Accommodating minor wear or surface irregularities

• Positive Locking: Providing mechanical interference that prevents rotation

Our lock washers are manufactured to exacting ASME, DIN, ISO, and MIL-SPEC standards, with complete material certification, full traceability, and engineering support for custom applications. We engineer these critical components from over 25 advanced alloys, ensuring reliable performance in extreme temperatures (cryogenic to 2000°F+), highly corrosive environments, high-vibration applications, and critical safety systems.

Lock Washer Classifications

1. Lock Washer Types by Design

2. Lock Washer Dimensional Standards

3. Special Application Lock Washers

• High-Temperature Lock Washers: For turbine, exhaust, and furnace applications

• Cryogenic Lock Washers: For LNG and low-temperature service

• Corrosion-Resistant Lock Washers: For chemical and marine environments

• Non-Magnetic Lock Washers: For MRI and sensitive instrumentation

• Vacuum Service Lock Washers: For semiconductor and space applications

• Nuclear Grade Lock Washers: With low cobalt and high purity requirements

• Biocompatible Lock Washers: For medical implants and devices

• Anti-Galling Lock Washers: For dissimilar metal combinations

• Conductive Lock Washers: For electrical grounding applications

• EMI/RFI Shielding Lock Washers: For electromagnetic interference protection

• Custom Lock Washers: Manufactured to your OEM specifications with unique tooth geometries, thicknesses, diameters, and material grades

4. Lock Washer Size Designations (Split Lock Washers)

Full Material Portfolio with International Standard Designations

As a special alloy fastening solution expert, RAYCHIN produces lock washers in the following comprehensive range of high-performance materials:

1. Precipitation-Hardening Stainless Steels

17-4 PH (UNS S17400): ASTM A564 Type 630, AMS 5643, DIN 1.4542 — Available in H900, H1025, H1150, H1150+ tempers. Exceptional combination of high strength (up to 180 ksi) and good corrosion resistance. Excellent spring properties when properly heat-treated. Ideal for aerospace lock washers, high-strength applications, defense hardware, and critical safety assemblies. *Keywords: 17-4 PH lock washers, 17-4 PH split washers.*

PH 13-8 Mo (UNS S13800): ASTM A564 Type 625, AMS 5629 — Superior strength (up to 220 ksi), exceptional toughness, and outstanding stress corrosion cracking resistance. Available in H950, H1000, H1050 tempers. Recommended for aerospace structural lock washers, defense applications, medical implants, and critical assemblies. *Keywords: PH 13-8 Mo lock washers.*

2. Nickel-Based Superalloys

Inconel® Alloys:

• Inconel 600 (UNS N06600): ASTM B166, AMS 5665 — General purpose high-temperature alloy with excellent oxidation and corrosion resistance to 2000°F. Good resistance to chloride stress corrosion cracking. Maintains spring properties at elevated temperatures. Ideal for heat treat furnace lock washers, chemical processing equipment, nuclear applications, and high-temperature lock washers. Keywords: Inconel 600 lock washers.

• Inconel 625 (UNS N06625): ASTM B446, AMS 5666 — Exceptional resistance to pitting, crevice corrosion, and high-temperature oxidation. Outstanding fatigue strength and resistance to chloride ions. High strength from cryogenic to 1800°F. Recommended for marine lock washers, offshore platform hardware, chemical tank fittings, seawater immersion applications, and aerospace components. Keywords: Inconel 625 lock washers.

• Inconel 718 (UNS N07718): AMS 5663, ASTM B637 — High-strength alloy with exceptional creep rupture strength up to 1300°F. Excellent cryogenic properties and good spring characteristics. Ideal for aerospace engine lock washers, high-temperature applications, racing components, downhole tools, and high-performance automotive. Keywords: Inconel 718 lock washers.

Monel® Alloys:

• Monel 400 (UNS N04400): ASTM B164, AMS 4675 — Superior resistance to seawater, steam, and caustic environments. Excellent corrosion resistance in reducing conditions. Good spring properties. Recommended for marine lock washers, naval vessel hardware, chemical processing equipment, offshore installations, and architectural marine applications. Keywords: Monel 400 lock washers.

• Monel K500 (UNS N05500): ASTM B865, AMS 4676 — Age-hardenable version offering increased strength and hardness while maintaining excellent corrosion resistance. Excellent spring properties and wear resistance. Ideal for pump lock washers, marine fasteners, oil & gas applications, high-strength marine hardware, and valve components. Keywords: Monel K500 lock washers.

Hastelloy® Alloys:

• Hastelloy C276 (UNS N10276): ASTM B574, AMS 5754 — Excellent resistance to a wide range of corrosive chemicals including strong oxidizers and reducing agents. Outstanding resistance to pitting and stress corrosion cracking. Recommended for chemical processing lock washers, pharmaceutical apparatus, pollution control systems, flue gas desulfurization, and nuclear waste processing fixtures. Keywords: Hastelloy C276 lock washers.

• Hastelloy C22 (UNS N06022): ASTM B574, AMS 5755 — Superior resistance to oxidizing media and localized corrosion. Excellent in mixed acid environments and chloride-containing media. Ideal for bleaching systems, pickling equipment, nuclear waste processing, aggressive chemical service, and pharmaceutical reactors. Keywords: Hastelloy C22 lock washers.

• Hastelloy B2 (UNS N10665): ASTM B335 — Exceptional resistance to reducing acids like hydrochloric and sulfuric at all concentrations and temperatures. Outstanding resistance to hydrogen chloride gas. Recommended for hydrochloric acid processing, chemical reactors, evaporators, acid concentration plants, and chemical storage fixtures. Keywords: Hastelloy B2 lock washers.

Incoloy® Alloys:

• Incoloy 825 (UNS N08825): ASTM B423, AMS 5870 — Excellent resistance to reducing and oxidizing acids, stress corrosion cracking, and intergranular attack. Good resistance to sulfuric and phosphoric acids. Ideal for pickling tank hardware, pollution control equipment, nuclear fuel reprocessing, chemical storage vessels, and food processing equipment. Keywords: Incoloy 825 lock washers.

• Incoloy 925 (UNS N09925): ASTM B805 — High-strength, age-hardenable alloy with excellent resistance to sour gas environments. Good corrosion resistance and mechanical properties. Recommended for downhole instrumentation, wellhead equipment, subsea enclosures, oil & gas production, and high-temperature applications. Keywords: Incoloy 925 lock washers.

High-Temperature Alloys:

• Waspaloy (UNS N07001): AMS 5708, AMS 5824 — Precipitation-hardenable alloy with exceptional high-temperature strength to 1600°F. Excellent oxidation and creep resistance. Good spring properties at elevated temperatures. Ideal for gas turbine lock washers, jet engine components, high-temperature instrumentation, aerospace fasteners, and racing applications. Keywords: Waspaloy lock washers.

• Nimonic® Series:

  • Nimonic 80A (UNS N07080): BS HR 501, AMS 5842 — Creep and rupture strength up to 1500°F. Excellent oxidation resistance and good corrosion resistance. Maintains spring properties at elevated temperatures. Recommended for exhaust system lock washers, heat treatment fixtures, turbocharger components, gas turbine parts, and high-temperature springs. Keywords: Nimonic 80A lock washers.

  • Nimonic 90 (UNS N07090): BS HR 502, AMS 5796 — Enhanced high-temperature properties with superior oxidation resistance. Good creep strength and fatigue resistance. Excellent spring properties at high temperatures. Ideal for gas turbine lock washers, high-temperature applications, aerospace engine hardware, high-performance racing components, and exhaust valves. Keywords: Nimonic 90 lock washers.

3. Duplex & Super Duplex Stainless Steels

Duplex 2205 (UNS S32205/S31803): ASTM A193 B8S, EN 1.4462 — Twice the yield strength of 316 stainless with excellent chloride stress corrosion resistance. Outstanding pitting resistance (PREN 34-36). Good fatigue strength and spring properties. Recommended for offshore platform lock washers, desalination plant hardware, marine deck equipment, chemical tankers, and subsea applications. Keywords: Duplex 2205 lock washers.

Super Duplex Alloys:

• Alloy 926 (UNS N08926): ASTM B691, EN 1.4529 — PREN >40 for severe chloride and seawater environments. Excellent resistance to crevice corrosion and pitting. Good mechanical properties. Ideal for subsea lock washers, coastal infrastructure, chemical tanker hardware, desalination plants, and marine instrumentation. Keywords: Alloy 926 lock washers.

• AL-6XN® (UNS N08367): ASTM B691, AMS 5875 — Superior pitting and crevice corrosion resistance in highly chlorinated atmospheres. Outstanding resistance to seawater and chloride solutions. Recommended for flue gas desulfurization, seawater cooling systems, pharmaceutical equipment, food processing, and marine hardware. *Keywords: AL-6XN lock washers.*

4. Titanium Alloys

Grade 2 Titanium (UNS R50400): ASTM B348, AMS 4921 — Excellent corrosion resistance with good formability and weldability. Outstanding seawater resistance and biocompatibility. Good spring properties. Ideal for marine lock washers, architectural hardware, chemical processing equipment, medical devices, and food processing. Keywords: Titanium Grade 2 lock washers.

Grade 5 Titanium (Ti-6Al-4V) (UNS R56400): AMS 4928, ASTM F467 — High strength-to-weight ratio (120 ksi typical), excellent corrosion resistance, and biocompatibility. Available in annealed and aged conditions. Excellent fatigue properties and spring characteristics. Recommended for aerospace lock washers, medical devices, surgical instruments, high-performance automotive components, racing applications, and sports equipment. Keywords: Titanium Grade 5 lock washers.

Grade 7 Titanium (UNS R52400): ASTM B348 — Superior corrosion resistance with palladium addition. Excellent in reducing and oxidizing acid environments. Ideal for chemical processing, desalination plants, pollution control equipment, aggressive corrosion service, and marine applications. Keywords: Titanium Grade 7 lock washers.

Grade 23 Titanium (Ti-6Al-4V ELI) (UNS R56401): ASTM F136, ASTM F1472 — Extra-low interstitial version of Grade 5 with enhanced toughness and ductility. Superior biocompatibility. Recommended for medical implants, surgical instruments, dental devices, and biocompatible applications. Keywords: Titanium Grade 23 lock washers.

5. Refractory & Exotic Metals

Tantalum (UNS R05200): ASTM B365, AMS 7845 — Ultimate corrosion resistance in aggressive acid environments. Completely inert to most chemicals. Excellent biocompatibility. Ideal for chemical reactor lock washers, pharmaceutical processing equipment, high-purity applications, medical implants, and laboratory equipment. Keywords: Tantalum lock washers.

Zirconium 702 (UNS R60702): ASTM B550, ASME SB550 — Excellent resistance to sulfuric, hydrochloric, and nitric acids. Outstanding in organic acids and alkaline media. Ideal for nuclear fuel processing, chemical reactors, heat exchanger hardware, aggressive chemical service, and reprocessing equipment. Keywords: Zirconium lock washers.

Zirconium 705 (UNS R60705): ASTM B550 — Niobium-stabilized version with enhanced strength and formability. Good corrosion resistance. Recommended for chemical processing, nuclear applications, and high-temperature service. Keywords: Zirconium 705 lock washers.

Molybdenum (UNS R03600): ASTM B387 — High temperature strength and stiffness for extreme thermal applications to 3000°F. Excellent thermal conductivity and low thermal expansion. Ideal for high-temperature furnaces, semiconductor processing equipment, glass manufacturing, high-temperature fixtures, and electronics. Keywords: Molybdenum lock washers.

TZM Molybdenum (Titanium-Zirconium-Molybdenum): ASTM B386 — Enhanced high-temperature strength and recrystallization resistance. Superior to pure molybdenum. Recommended for high-temperature applications, semiconductor, and aerospace. Keywords: TZM lock washers.

Tungsten (UNS R07005): ASTM B777 — Highest density and melting point for specialized radiation shielding and high-temperature applications. Exceptional wear resistance and thermal stability. Ideal for medical imaging equipment, aerospace counterweights, high-temperature fixtures, radiation shielding, and balancing applications. Keywords: Tungsten lock washers.

6. Specialty Stainless Steels & Nickel Alloys

Nitronic® Alloys:

• Nitronic 50 (XM-19) (UNS S20910): ASTM A193 B8N — High strength (twice the yield strength of 316 stainless), non-magnetic, excellent corrosion resistance. Good cryogenic properties. Recommended for medical imaging equipment, marine instrumentation, high-strength electronic enclosures, aerospace components, and subsea applications. Keywords: Nitronic 50 lock washers.

• Nitronic 60 (UNS S21800): ASTM A193 B8N — Superior wear and galling resistance with good corrosion properties. Excellent for frequently adjusted lock washers and moving parts. Self-lubricating characteristics. Ideal for valve components, pump hardware, adjustable mechanisms, high-wear applications, and instrumentation. Keywords: Nitronic 60 lock washers.

High-Performance Stainless:

• 254 SMO (UNS S31254): EN 1.4547, ASTM A479 — Excellent seawater and chloride resistance with high PREN value (>42). Outstanding pitting and crevice corrosion resistance. Recommended for offshore electronics, desalination hardware, coastal architectural fasteners, marine applications, and chemical processing. Keywords: 254 SMO lock washers.

• 310 Stainless Steel (UNS S31000): ASTM A276, AISI 310 — Outstanding high-temperature oxidation resistance up to 2000°F. Excellent in cyclic temperature conditions. Good carburization resistance. Ideal for furnace hardware, heat treat fixtures, exhaust system components, high-temperature sensors, and thermal processing. Keywords: 310SS lock washers.

• 316/316L Stainless Steel (UNS S31600/S31603): ASTM A276, ASTM A193 — Excellent corrosion resistance in marine and chemical environments. Good mechanical properties and spring characteristics. Available in low-carbon version for improved weldability. Recommended for general industrial lock washers, marine hardware, medical devices, food processing, and pharmaceutical equipment. Keywords: 316L lock washers, 316SS lock washers.

• Alloy 20 (Carpenter 20) (UNS N08020): ASTM B473 — Superior resistance to sulfuric acid and chloride stress corrosion. Excellent in mixed acid environments. Recommended for chemical processing equipment, pharmaceutical reactors, food processing hardware, acid handling systems, and pickling equipment. Keywords: Alloy 20 lock washers.

• Alloy 330 (UNS N08330): ASTM B536 — Excellent carburization and oxidation resistance at elevated temperatures. Good resistance to thermal fatigue. Ideal for industrial furnaces, heat treating equipment, petrochemical processing, high-temperature fixtures, and thermal cycling applications. Keywords: Alloy 330 lock washers.

7. Ultra-High-Strength Cobalt Alloys

MP35N (UNS R30035): AMS 5844, ASTM F562 — Ultimate tensile strength exceeding 300 ksi with exceptional toughness and corrosion resistance. Non-magnetic. Excellent fatigue strength and biocompatibility. Superior spring properties. Recommended for aerospace actuators, medical implants, downhole instrumentation, high-security fasteners, marine applications, and racing components. Keywords: MP35N lock washers.

MP159 (AMS 5846): Advanced cobalt-nickel alloy offering high strength and creep resistance at elevated temperatures. Superior to MP35N in high-temperature applications. Excellent fatigue and oxidation resistance. Ideal for gas turbine hardware, aerospace engine components, high-performance racing fasteners, critical high-temperature assemblies, and defense applications. Keywords: MP159 lock washers.

Elgiloy® (UNS R30003): AMS 5833 — Non-magnetic, high-strength cobalt alloy with excellent corrosion resistance and fatigue properties. Exceptional spring characteristics. Recommended for medical devices, aerospace components, spring applications, and instrumentation. Keywords: Elgiloy lock washers.

8. High-Strength Aluminum & Iron-Based Alloys

Aluminum 2024 (UNS A92024): ASTM B211, AMS 4120 — High-strength aluminum alloy with good fatigue resistance. Available in T3, T4, T8 tempers. Recommended for aerospace components, defense hardware, and high-performance applications. Keywords: Aluminum 2024 lock washers.

Aluminum 6061 (UNS A96061): ASTM B211, AMS 4117 — Versatile, heat-treatable aluminum alloy with good corrosion resistance and weldability. Available in T6 temper. Ideal for general industrial applications, electronics enclosures, marine hardware, and architectural components. Keywords: Aluminum 6061 lock washers.

Aluminum 7075 (UNS A97075): AMS QQ-A-225/9, ASTM B211 — Available in T6, T73, T76 tempers. High strength-to-weight ratio (up to 83 ksi) with good corrosion resistance. Excellent machinability. Recommended for aerospace interiors, portable electronics, defense hardware, high-performance automotive components, sports equipment, and racing applications. Keywords: Aluminum 7075 lock washers.

A286 (UNS S66286): AMS 5731, ASTM A453 Grade 660 — Iron-based superalloy with excellent high-temperature strength and oxidation resistance to 1300°F. Good cryogenic properties and corrosion resistance. Good spring characteristics at elevated temperatures. Ideal for aerospace engine hardware, turbocharger components, high-temperature electronic enclosures, racing applications, and high-performance automotive. Keywords: A286 lock washers.

9. Pure Nickel

Nickel 200/201 (UNS N02200/N02201): ASTM B160, ASME SB160 — High purity and excellent corrosion resistance in caustic environments. Good thermal and electrical conductivity. Non-magnetic. Good spring properties for low-temperature applications. Recommended for caustic processing equipment, electronic components, food processing hardware, alkali service, and battery applications. Keywords: Nickel 200 lock washers.

Custom Lock Washer Manufacturing & Engineering Solutions

As a special alloy fastening solution expert, RAYCHIN provides complete custom lock washer manufacturing services tailored to your exact specifications:

Manufacturing Capabilities

Engineering & Design Services

Material Selection Expertise:
Our metallurgical engineers analyze your application environment — temperature range (-423°F to 2000°F), vibration frequency and amplitude, corrosive media exposure (pH 0-14), load requirements (clamping force, spring rate), magnetic permeability needs (<1.05 μ), galvanic compatibility with mating materials, and applicable standards — and recommend the optimal alloy from our 25+ material portfolio.

Lock Washer Type Selection:
We evaluate your application requirements to recommend the optimal lock washer design:

• Split lock washers for general vibration resistance

• Internal tooth lock washers for small heads and electrical grounding

• External tooth lock washers for large bearing surfaces

• Wave washers for bearing preload and noise reduction

• Belleville washers for high spring force and thermal compensation

• Custom tooth geometries for specialized locking requirements

Spring Property Engineering:
Our metallurgists optimize heat treatment processes to achieve specific spring characteristics:

• Load deflection curves matched to application requirements

• Stress relaxation resistance for high-temperature service

• Fatigue life for cyclic loading applications

• Creep resistance for sustained load conditions

Prototype Development:
Rapid turnaround prototype quantities (as few as 5 pieces) for design validation, fit-checking, and functional testing prior to full production. Typical prototype lead time: 7-14 business days.

Quality Assurance & Certification

• Material Certification: Complete Material Test Reports (MTRs) to EN 10204 3.1/3.2 with full traceability to melt source

• Dimensional Inspection: CMM, optical comparator, vision system, and laser micrometry verification to customer specifications

• Spring Testing: Load-deflection testing, spring rate verification

• Hardness Testing: Rockwell, Vickers, or Brinell as required

• Metallurgical Analysis: Microstructure examination, case depth verification

• PMI Testing: Positive Material Identification verification

• Non-Destructive Testing: Liquid penetrant (FPI) inspection as required

• Corrosion Testing: Salt spray (ASTM B117) testing available

• Process Certification: AS9100, ISO 9001, ISO 13485, ITAR, NADCAP, and PED compliant

Industry Applications & Engineering Recommendations

Why Choose RAYCHIN as Your Fastening Solution Expert?

25+ Years of Material Science Leadership:

Our metallurgical engineering team possesses deep expertise across the full spectrum of superalloys, refractory metals, and specialty stainless steels. We maintain a comprehensive database of material properties, spring characteristics, corrosion resistance data, and application performance records. We don't just manufacture washers — we engineer solutions optimized for your specific application environment.

Complete Vertical Integration:

From raw material sourcing and certification through manufacturing, heat treatment, surface finishing, and quality inspection, all processes are performed in-house under strict quality control. This vertical integration ensures:

• Consistent quality from lot to lot

• Complete traceability from melt source to finished product

• Rapid response to design changes

• Competitive pricing without supply chain markups

• Shorter lead times for prototype and production quantities

Engineering Partnership:

We view ourselves as an extension of your engineering team. Our fastener engineers provide:

• Technical consultation on material selection based on application requirements

• Lock washer type selection for optimal vibration resistance

• Spring property engineering for specific load requirements

• Galvanic compatibility analysis for dissimilar metal applications

• Failure analysis and corrective action support

• Finite element analysis (FEA) for critical applications

• Custom testing protocols for unique requirements

Global Standards Compliance:

Our products meet or exceed ASTM, ASME, DIN, ISO, JIS, BS, GB, and MIL-SPEC specifications, ensuring acceptance in regulated industries and global supply chains. We maintain current knowledge of international standards and can provide certification for any required specification.

Supply Chain Reliability:

We maintain strategic raw material inventory across our 25+ alloy portfolio, flexible manufacturing capacity, and robust quality systems to ensure consistent on-time delivery for both prototype quantities (5-100 pieces) and high-volume production runs (100,000+ pieces).

Sustainability Commitment:

We are committed to responsible material sourcing, energy-efficient manufacturing, and waste reduction. Our quality systems include:

• Conflict minerals compliance (due diligence per OECD guidelines)

• REACH and RoHS compliance for European markets

• Environmental management (ISO 14001 principles)

• Recycling and waste reduction programs

• Sustainable packaging initiatives

Technical Specifications & Ordering Information

Standard Size Ranges

Lock Washer Standards Available

Available Finishes

Request Engineering Consultation & Quote

Contact RAYCHIN's special alloy fastening solution experts today with your specifications or CAD drawings. We provide confidential technical consultation, rapid response prototyping, and competitive pricing for standard and custom lock washer solutions in advanced alloys.

Email: sales@ray-chin.com
Web:www.ray-chin.com
Response Time: < 24 hours
Engineering Support: Available in English, Mandarin, German, and Spanish
Prototype Turnaround: 7-14 business days
Production Lead Time: 3-6 weeks depending on quantity and alloy

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