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Carbon Steel Washers

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Manufacturer, Exporter & Supplier of Carbon Steel Washers

Carbon Steel Washers – ASTM & DIN Standard Industrial Fasteners

Carbon steel washers are precision-engineered fastening components designed to distribute load, reduce surface damage, and enhance joint stability in mechanical assemblies. Manufactured from low, medium, and high carbon steel grades, these washers comply with international standards such as ASTM F844, DIN 125, and ISO 7089, ensuring dimensional accuracy and consistent performance under load.

Carbon Steel Washers Manufacturer

Widely used across construction, automotive manufacturing, and heavy machinery sectors, carbon steel washers play a critical role in preventing loosening, especially in high-vibration environments. Their adaptability to multiple coatings—such as zinc plating or black oxide—makes them suitable for both indoor and moderately corrosive environments.

KK Fasteners supplies carbon steel washers to global markets with full material traceability and batch-level quality documentation, supporting OEMs and EPC contractors in achieving reliable fastening performance across diverse applications.

Technical Specification List Of Carbon Steel Washers

Parameter Specification
Material Low Carbon Steel (C15, C20), Medium Carbon Steel (C35, C45), High Carbon Steel
Grades ASTM F844, ASTM A36, SAE 1010–1045
Size Range M3 to M100 / 1/8" to 4"
Standards DIN 125, DIN 9021, ISO 7089, ASTM F844, BS 4320
Type Variants Flat Washers, Plain Washers, Fender Washers, Structural Washers
Surface Finish Zinc Plated, Hot Dip Galvanized (HDG), Black Oxide, Phosphate Coated
Hardness 120–300 HV (depending on grade)
Tensile Strength 400–800 MPa

Carbon Steel 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
-
-
-

Carbon Steel 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"
-
-
-

Different Types of Carbon Steel Washers

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

Key Technical Features

  • Engineered to distribute compressive loads evenly across fastening surfaces, reducing localized stress and preventing material deformation in bolted joints.
  • Manufactured to DIN and ASTM dimensional tolerances, ensuring precise fitment with standard bolts and nuts in structural assemblies.
  • Available in high tensile variants up to 800 MPa, suitable for load-bearing applications in construction and heavy equipment.
  • Surface coatings such as zinc plating and HDG provide moderate corrosion resistance, extending service life in outdoor environments.
  • Optimized thickness-to-diameter ratio enhances resistance to deformation under high clamping forces.
  • Compatible with both metric and imperial fastening systems, supporting global engineering standards.
  • Smooth surface finish reduces friction during tightening, ensuring accurate torque application and improved joint integrity.
  • Suitable for high-volume industrial use due to consistent batch production and uniform mechanical properties.

Industry Applications

Carbon steel washers are used to distribute load, prevent loosening, and protect surfaces in bolted assemblies across structural and mechanical systems.

  • Structural Steel Construction — Used in beam-to-column connections to distribute load and prevent bolt head embedding.
  • Automotive Assembly — Applied in chassis and suspension systems to stabilize bolted joints under vibration.
  • Heavy Machinery — Ensures secure fastening in equipment subjected to dynamic loads and repeated stress cycles.
  • Oil & Gas Equipment — Used in pipeline flanges and support structures where mechanical reliability is critical.
  • Power Generation Plants — Installed in turbine assemblies and structural frameworks for load distribution.
  • Industrial Fabrication — Supports sheet metal fastening without surface damage during tightening.
  • Agricultural Equipment — Provides stability in bolted joints exposed to outdoor conditions and mechanical shocks.

Manufacturing & Quality Assurance

Carbon steel washers are produced through cold stamping or punching processes, followed by heat treatment to achieve required mechanical properties. Surface finishing processes such as galvanizing or plating are applied to enhance durability.

Quality control includes dimensional inspection using calibrated gauges, hardness testing (HV scale), and coating thickness verification. Each batch undergoes visual and mechanical checks to ensure compliance with ASTM and DIN standards.

At KK Fasteners, production is aligned with ISO 9001-certified quality systems, ensuring full traceability from raw material to final dispatch, along with inspection reports and material test certificates.

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Carbon Steel Washers - FAQs

Carbon steel washers are flat circular components used in fastening systems to distribute load, prevent surface damage, and improve joint stability. They are placed between a bolt head or nut and the material surface to enhance clamping force and reduce the risk of loosening.

Carbon steel washers are available in low, medium, and high carbon grades such as C15, C20, C35, and C45. Low carbon grades offer better ductility, while medium and high carbon grades provide increased strength and hardness for structural and heavy-duty applications.

Common standards include ASTM F844, DIN 125, DIN 9021, ISO 7089, and BS 4320. These standards define dimensions, tolerances, and mechanical properties, ensuring compatibility with both metric and imperial fastening systems used globally.

Selection depends on load requirements, bolt size, and environmental conditions. For general applications, low carbon steel washers are suitable, while high-load or structural applications require medium or high carbon grades with appropriate coatings like zinc plating or galvanization.

A reliable manufacturer should offer ISO-certified production, adherence to ASTM/DIN standards, and full material traceability. Suppliers like KK Fasteners provide consistent quality, inspection documentation, and global export capability, which are key factors for procurement teams.

Carbon Steel Washers - Export Destination

Carbon Steel 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.
Carbon Steel Washers Supplier in South America
Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Falkland Islands, French Guiana, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela.
Carbon Steel 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.
Carbon Steel 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.
Carbon Steel Washers Supplier in Australia
Australia, Fiji, Kiribati, Marshall Islands, Micronesia, Nauru, New Zealand, Palau, Papua New Guinea, Samoa, Solomon Islands, Tonga, Tuvalu, Vanuatu.

Reliable fastening starts with precision components that meet both mechanical and dimensional standards. Carbon steel washers supplied with full traceability and consistent quality help maintain long-term joint performance. For project-specific requirements or bulk inquiries, connect with KK Fasteners to request a technical quote or discuss customization options with the engineering team

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