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Alloy 218 Washers

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Manufacturer, Exporter & Supplier of Alloy 218 Washers

Alloy 218 Washers – High Performance Nickel Alloy Flat Washers for Industrial Applications

Alloy 218 washers are precision-engineered fastening components designed to distribute load, prevent surface damage, and enhance joint integrity in high-performance industrial assemblies. Manufactured from nickel-based Alloy 218, these washers offer excellent resistance to corrosion, oxidation, and elevated temperatures, making them suitable for demanding environments such as petrochemical processing, marine engineering, and power generation systems.

Alloy 218 Washers Manufacturer

The combination of mechanical strength and thermal stability ensures consistent performance under cyclic loads and aggressive media exposure. These washers are typically produced in compliance with ASTM, DIN, and ISO standards to ensure dimensional accuracy and compatibility with international fastening systems. KK Fasteners supplies Alloy 218 washers to global industrial buyers, supporting applications where reliability and material traceability are critical for long-term operation.

Technical Specifications

Material VariantsAlloy 218 (Nickel-Based Alloy), Inconel Grades (Equivalent Options)
Grade OptionsUNS N02189 (Equivalent Reference), Custom Alloy Variants
Size RangeM3 to M100 / 1/8" to 4"
Thread CompatibilityMetric, UNC, UNF, BSW
StandardsDIN 125, DIN 9021, ISO 7089, ASTM B366
Surface FinishPlain, Polished, Passivated, Coated (PTFE, Zinc)
TypesFlat Washers, Fender Washers, Plain Washers, Custom Machined Washers
Hardness150–220 HB (depending on processing)
Tensile StrengthUp to 700 MPa (application dependent)

Chemical Composition Of Alloy 218 Washers

Alloy 218 Ni C Mo Mn Si Fe Cu S P Cr
32 – 38 0.02 max 2 – 3 1 – 2 0.7 max Bal 3 – 4 0.005 max 0.02 max 19 – 21

Mechanical Properties Of Alloy 218 Washers

Density Melting Point Yield Strength (0.2%Offset) Tensile Strength Elongation
8.1 g/cm3 1443 °C (2430 °F) Psi – 35000 , MPa – 241 Psi – 80000 , MPa – 551 30 %

Equivalent Grades of Alloy 218 Washers

STANDARD UNS WERKSTOFF NR. AFNOR EN JIS BS GOST
Alloy 218 N08020 2.4660 Z2NCUD31-20AZ NiCr20CuMo – – –

Alloy 218 Washers Dimensions

Flat Washers Dimensions
Bolt Size
USS
SAE
OD (in.)
ID (in.)
Thickness
OD (in.)
ID (in.)
Thickness
1/8 (#6)
-
-
-
0.375
0.156
.036/.065
5/32 (#8)
-
-
-
0.438
0.188
.036/.065
3/16 (#10)
0.560
0.250
.036/.065
0.500
0.220
.036/.065
7/32 (#12)
-
-
-
0.562
0.250
.051/.080
1/4 (#14)
0.734
0.312
.051/.080
0.625
0.281
.051/.080
5/16
0.875
0.375
.064/.104
0.688
0.344
.051/.080
3/8
1.000
0.438
.064/.104
0.812
0.406
.051/.080
7/16
1.250
0.500
.064/.104
0.922
0.469
.051/.080
1/2
1.375
0.562
.086/.132
1.062
0.531
.074/.121
9/16
1.469
0.625
.086/.132
1.156
0.594
.074/.121
5/8
1.750
0.688
.108/.160
1.312
0.656
.074/.121
3/4
2.000
0.812
.122/.177
1.469
0.812
.108/.160
7/8
2.250
0.938
.136/.192
1.750
0.938
.108/.160
1
2.500
1.062
.136/.192
2.000
1.062
.108/.160
1 1/8
2.750
1.250
.136/.192
2.250
1.250
.108/.160
1 1/4
3.000
1.375
.136/.192
2.500
1.375
.136/.192
1 3/8
3.250
1.500
.153/.213
2.750
1.500
.136/.213
1 1/2
3.500
1.625
.153/.213
3.000
1.625
.153/.213
1 5/8
3.750
1.750
.153/.213
-
-
-
1 3/4
4.000
1.875
.153/.213
-
-
-
1 7/8
4.250
2.000
.153/.213
-
-
-
2
4.500
2.125
.153/.213
-
-
-
2 1/4
4.750
2.375
.320/.248
-
-
-
2 1/2
5.000
2.625
.210/.280
-
-
-
2 3/4
5.250
2.875
.228/.410S
-
-
-
3
5.500
3.125
.249/.327
-
-
-

Alloy 218 Washers Size Chart

Size
USS
SAE
Inside Diameter
(A)
Outside Diameter
(B)
Thickness
(C)
Inside Diameter
(A)
Outside Diameter
(B)
Thickness
(C)
#2
-
-
-
3/32"
1/4"
0.020"
#4
-
-
-
1/8"
5/16"
0.032"
#6
-
-
-
5/32"
3/8"
0.049"
#8
-
-
-
3/16"
7/16"
0.049"
#10
-
-
-
7/32"
1/2"
0.049"
#12
-
-
-
1/4"
9/16"
0.065"
1/4"
5/16"
0.734"
0.065"
9/32"
5/8"
0.065"
5/16"
3/8"
7/8"
0.083"
11/32"
11/16"
0.065"
3/8"
7/16"
1"
0.083"
13/32"
13/16"
0.065"
7/16"
1/2"
1-1/4"
0.083"
15/32"
15/16"
0.065"
1/2"
9/16"
1-3/8"
0.109"
17/32"
1-1/16"
0.095"
9/16"
5/8"
1-15/32"
0.109"
19/32"
1-5/32"
0.095"
5/8"
11/16"
1-3/4"
0.134"
21/32"
1-5/16"
0.095"
3/4"
13/16"
2"
0.148"
13/16"
1-15/32"
0.134"
7/8"
15/16"
2-1/4"
0.165"
15/16"
1-3/4"
0.134"
1"
1-1/16"
2-1/2"
0.165"
1-1/16"
2"
0.134"
1-1/8"
1-1/4"
2-3/4"
0.165"
-
-
-
1-1/4"
1-3/8"
3"
0.165"
-
-
-
1-3/8"
1-1/2"
3-1/4"
0.180"
-
-
-
1-1/2"
1-5/8"
3-1/2"
0.180"
-
-
-
1-5/8"
1-3/4"
3-3/4"
0.180"
-
-
-
1-3/4"
1-7/8"
4"
0.180"
-
-
-
2"
2-1/8"
4-1/2"
0.213"
-
-
-

Range of Alloy 218 Washers

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Alloy 218 Spring Lock Washers

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Alloy 218 Plain Flat Washers

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Alloy 218 Square Washers

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Alloy 218 Square Bevel Washers

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Alloy 218 Tab Washers

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Alloy 218 External Tooth Lock Washers

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Alloy 218 Internal Tab Washers

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Alloy 218 Hex Washers

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Alloy 218 Bonded Sealing Washers

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Alloy 218 Conical Spring Washers

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Alloy 218 Countersunk Washers

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Alloy 218 Dock Washers

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Alloy 218 Fender Washers

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Alloy 218 Finishing Washers

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Alloy 218 Ogee Washers

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Alloy 218 Internal Tooth Lock Washers

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Alloy 218 Self Locking Washers

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Alloy 218 Wave Washers

Different Types of Alloy 218 Washers

  • Alloy 218 Spring Washers
  • Alloy 218 Machined Washers
  • Alloy 218 Square Washers
  • Alloy 218 Plain Flat Washers
  • Alloy 218 Spring Lock Washers
  • Alloy 218 Tab Washers
  • Alloy 218 Internal Tab Washers
  • Alloy 218 Square Beveled Washers
  • Alloy 218 Hex Washers
  • Alloy 218 External Tooth Lock Washers
  • Alloy 218 Internal Tooth Lock Washers
  • Alloy 218 Curved Wave Washers
  • Alloy 218 Conical Spring Washers
  • Alloy 218 Self Locking Washers
  • Alloy 218 Dock Washers
  • Alloy 218 Fender Washers
  • Alloy 218 Ogee Washers
  • Alloy 218 Sealing Washers
  • Alloy 218 Countersunk Washers
  • Alloy 218 Finishing Washers

Key Technical Features

  • Engineered to distribute compressive loads evenly across bolted joints, reducing localized stress concentrations and preventing material deformation in high-load assemblies.
  • Manufactured with tight dimensional tolerances as per DIN/ISO standards, ensuring precise fitment and compatibility with automated assembly systems.
  • Alloy 218 composition provides strong resistance to oxidation and scaling at temperatures exceeding 800°C, supporting use in heat-intensive environments.
  • High corrosion resistance against chlorides, acids, and marine atmospheres extends service life in offshore and chemical processing installations.
  • Surface finishes such as passivation and PTFE coating enhance wear resistance and reduce friction during installation.
  • Maintains structural integrity under cyclic loading conditions, making it suitable for vibration-prone applications such as turbines and compressors.
  • Compatible with a wide range of fasteners, including high-strength bolts and studs, ensuring flexibility in engineering design.
  • Custom machining capability allows non-standard inner/outer diameters for specialized industrial assemblies.

Industry Applications

Alloy 218 washers are used in critical fastening systems where high temperature, corrosion resistance, and mechanical stability are required.

  • Oil & Gas Processing Equipment — Used in flange connections and pressure vessel assemblies exposed to corrosive hydrocarbons and high temperatures.
  • Power Generation Plants — Installed in turbines, boilers, and heat exchangers where thermal cycling demands stable fastening performance.
  • Marine & Offshore Structures — Protect bolted joints in saltwater environments, reducing galvanic corrosion risks.
  • Chemical Processing Industry — Used in reactors and piping systems handling aggressive chemicals and acids.
  • Aerospace Components — Applied in structural assemblies requiring lightweight yet high-strength fastening solutions.
  • Industrial Furnaces & Heat Treatment Units — Maintain joint integrity in extreme heat zones.
  • Heavy Engineering & Machinery — Support load distribution in high-pressure mechanical systems.

Manufacturing & Quality Assurance

Alloy 218 washers are typically produced through precision stamping or CNC machining, followed by controlled heat treatment processes to achieve desired mechanical properties. Surface finishing processes such as passivation or polishing are applied to improve corrosion resistance and dimensional consistency.


At KK Fasteners, each batch undergoes strict inspection protocols, including dimensional verification using calibrated gauges, hardness testing, and surface finish evaluation. Material traceability is maintained from raw material sourcing to final dispatch, supported by test certificates aligned with ISO 9001 quality management systems. Additional compliance with RoHS and REACH ensures suitability for global industrial applications.

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Send us your Requirement forAlloy 218 Washers

We can assure you one of best prices in the Industry. We respond to all enquiries with in 4-8 hours on all business days. Send us your requirement on inquiry@kkfasteners.com
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Alloy 218 Washers - FAQs

Alloy 218 washers are flat or precision-machined components made from nickel-based Alloy 218, designed to distribute load in bolted joints while offering high resistance to heat, corrosion, and mechanical stress in demanding industrial environments.

Yes, Alloy 218 washers are specifically designed for high-temperature environments. They maintain mechanical strength and resist oxidation at temperatures exceeding 800°C, making them suitable for power plants, furnaces, and chemical processing systems.

These washers are typically manufactured in accordance with DIN 125, DIN 9021, ISO 7089, and ASTM B366 standards, ensuring dimensional accuracy, material compliance, and compatibility with global fastening systems.

Selection depends on load requirements, operating temperature, exposure to corrosive media, and compatibility with bolts or studs. Engineers typically consider washer thickness, diameter, and coating to match application-specific conditions

Look for suppliers with ISO-certified processes, material traceability, and export experience. A manufacturer like KK Fasteners provides documented quality checks, global shipping capability, and technical support for industrial buyers.

Alloy 218 Washers - Export Destination

Alloy 218 Washers Supplier in North America
Antigua and Barbuda, Bahamas, Barbados, Belize, Canada, Costa Rica, Cuba, Dominica, Dominican Republic, El Salvador, Grenada, Guatemala, Haiti, Honduras, Jamaica, Mexico, Nicaragua, Panama, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Trinidad and Tobago, United States.
Alloy 218 Washers Supplier in South America
Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Falkland Islands, French Guiana, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela.
Alloy 218 Washers Supplier in Europe
Albania, Andorra, Austria, Belarus, Belgium, Bosnia and Herzegovina, Bulgaria, Croatia, Czech Republic (Czechia), Denmark, Estonia, Finland, France, Germany, Greece, Holy See, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Moldova, Monaco, Montenegro, Netherlands, North Macedonia, Norway, Poland, Portugal, Romania, Russia, San Marino, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Ukraine, United Kingdom.
Alloy 218 Washers Supplier in Asia
Afghanistan, Armenia, Azerbaijan, Bahrain, Bangladesh, Bhutan, Brunei, Cambodia, Cyprus, Georgia, India, Indonesia, Iran, Iraq, Israel, Japan, Jordan, Kazakhstan, Kuwait, Kyrgyzstan, Laos, Lebanon, Malaysia, Maldives, Mongolia, Myanmar, Nepal, Oman, Pakistan, Palestine, Philippines, Qatar, Saudi Arabia, Singapore, South Korea, Sri Lanka, State of Palestine, Syria, Taiwan, Tajikistan, Thailand, Timor-Leste, Turkey, Turkmenistan, United Arab Emirates, Uzbekistan, Vietnam, Yemen.
Alloy 218 Washers Supplier in Australia
Australia, Fiji, Kiribati, Marshall Islands, Micronesia, Nauru, New Zealand, Palau, Papua New Guinea, Samoa, Solomon Islands, Tonga, Tuvalu, Vanuatu.

For projects requiring reliable performance under heat, pressure, and corrosive exposure, Alloy 218 washers provide a proven fastening solution. KK Fasteners supports global buyers with consistent quality, traceable materials, and engineering-backed supply. Request a quote or connect with the technical team to discuss specifications tailored to your application.

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