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Alloy Steel Washers

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Manufacturer, Exporter & Supplier of Alloy Steel Washers

Alloy Steel Washers for High-Load Industrial Fastening Applications

Alloy steel washers are precision-engineered fastening components designed to distribute load, reduce surface wear, and improve joint integrity in high-stress assemblies. Manufactured from heat-treated alloy steels and compliant with standards such as DIN 125, ASTM F436, and ISO 7089, these washers are widely used in structural, mechanical, and heavy equipment applications where strength and reliability are critical.

Alloy Steel Washers Manufacturer

In demanding industries like construction, oil & gas, and power generation, alloy steel washers play a key role in maintaining preload and preventing bolt loosening under vibration or dynamic loads. Their hardened structure ensures resistance to deformation even under extreme clamping forces.

KK Fasteners supplies alloy steel washers to global industrial buyers, offering consistent dimensional accuracy, material traceability, and export-ready packaging for large-scale projects across multiple regions.

Technical Specification List Of Alloy Steel Washers

Parameter Details
Material Alloy Steel (EN 19, EN 24, ASTM A193 B7, B16)
Grades Class 8.8, 10.9, 12.9 (Hardened & Tempered)
Size Range M6 to M100 / 1/4" to 4"
Thread Compatibility Metric, UNC, UNF
Standards DIN 125, DIN 6916, ASTM F436, ISO 7089, BS 4320
Surface Finish Black Oxide, Phosphate Coated, Zinc Plated, HDG
Types Flat Washers, Structural Washers, Heavy Duty Washers
Hardness HRC 25–45 (depending on grade)
Tensile Strength 800 MPa – 1200 MPa

Alloy 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
-
-
-

Alloy 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 Alloy Steel Washers

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

Key Technical Features

  • Heat-treated alloy composition delivers tensile strength up to 1200 MPa, making these washers suitable for high-load structural assemblies.
  • Designed to evenly distribute clamping force, reducing localized stress and preventing material deformation in bolted joints.
  • Precision-machined to DIN and ISO tolerances, ensuring consistent thickness and inner diameter accuracy for reliable fitment.
  • High hardness range (HRC 25–45) improves wear resistance under repeated tightening and loosening cycles.
  • Compatible with high-grade bolts (Class 8.8 to 12.9), maintaining preload integrity in dynamic and vibration-prone environments.
  • Surface coatings such as zinc plating and phosphating provide moderate corrosion resistance in industrial conditions.
  • Available in heavy-duty variants like DIN 6916 for structural steel connections requiring enhanced load-bearing capacity.
  • Resistant to mechanical fatigue, making them suitable for long-term use in rotating or cyclic load applications.

Industry Applications

Alloy steel washers are used to support high-strength fastening systems where load distribution and joint stability are critical.

  • Structural Steel Construction — Used with high-tensile bolts in bridges and buildings to distribute load and prevent surface indentation.
  • Oil & Gas Equipment — Applied in pipeline flanges and pressure vessels to maintain sealing integrity under high pressure.
  • Power Generation Plants — Installed in turbines and heavy machinery assemblies exposed to vibration and thermal expansion.
  • Automotive Manufacturing — Used in suspension systems and engine assemblies requiring consistent preload retention.
  • Heavy Machinery — Supports bolted joints in mining and earthmoving equipment subjected to shock loads.
  • Railway Infrastructure — Utilized in track fastening systems and rolling stock components for durability and safety.
  • Shipbuilding & Marine Equipment — Used in structural joints requiring strength and resistance to mechanical stress.

Manufacturing & Quality Assurance

Alloy steel washers are produced using precision stamping or CNC machining followed by heat treatment processes such as quenching and tempering to achieve the required hardness and strength. Surface finishing processes are applied to enhance corrosion resistance and surface integrity.

Quality control includes dimensional inspection using calibrated gauges, hardness testing (Rockwell scale), and surface finish verification. Each batch undergoes material composition analysis and traceability checks to ensure compliance with ASTM and DIN standards.

At KK Fasteners, production follows ISO 9001-certified processes with strict lot traceability, ensuring consistent quality for both domestic and export shipments.

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Alloy Steel Washers - FAQs

Alloy steel washers are hardened fastening components used to distribute load, reduce friction, and prevent surface damage in bolted joints. Made from heat-treated alloy steels, they offer high strength and durability, making them suitable for heavy-duty industrial and structural applications.

Alloy steel washers contain additional elements such as chromium, molybdenum, or nickel, which enhance strength, hardness, and fatigue resistance. Carbon steel washers are more economical but provide lower mechanical performance, making them suitable for lighter-duty applications.

Alloy steel washers are manufactured according to standards like ASTM F436 for structural applications, DIN 125 and DIN 6916 for flat and heavy-duty washers, and ISO 7089 for general-purpose use. These standards define dimensions, hardness, and material specifications.

The right washer depends on bolt grade, load requirements, and environmental conditions. For high-strength bolts such as Class 10.9 or 12.9, hardened washers like ASTM F436 are recommended to maintain preload and prevent deformation under high clamping forces.

A reliable supplier should have ISO-certified processes, provide full material traceability, and comply with international standards. Manufacturers like KK Fasteners support global buyers with consistent quality, inspection reports, and export-ready documentation.

Alloy Steel Washers - Export Destination

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

Alloy steel washers are essential for maintaining joint integrity in high-load environments, and consistent quality directly impacts system performance. KK Fasteners ensures precision manufacturing, traceable materials, and export-ready supply for industrial buyers worldwide. For detailed specifications or bulk pricing, request a quote  or connect with the engineering team to discuss your project requirements.

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