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ASTM A490 Washers Manufacturer & Exporter in India

Explore ASTM A490 Washers Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
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-196

Min Temp

870

Max Temp

🌡

870

Suitable for continuous service up to approximately 870°C under typical operating conditions.

⚡

620

Typical tensile strength around 620 MPa depending on product form and heat treatment.

🛡

Very Good

Very Good corrosion resistance in a wide range of industrial environments.

⚖

8

Typical density is approximately 8.0 g/cm³.

Product Overview

What are ASTM A490 Washers?

ASTM A490 washers are high-strength, quenched and tempered alloy steel washers designed for use with ASTM A490 structural bolts in critical steel construction applications. These washers are engineered to provide uniform load distribution and prevent bolt head or nut embedding into the connected material, ensuring the integrity of high-tension bolted joints. Manufactured to precise tolerances, ASTM A490 washers are essential for pre-tensioned and slip-critical connections in bridges, buildings, and heavy structures where maximum joint reliability is required.

ASTM A490 washers are typically supplied as hardened flat washers conforming to ASTM F436/F436M, ensuring compatibility with the mechanical properties and dimensional requirements of A490 bolts. Their robust design and heat treatment make them suitable for use in demanding environments, including seismic zones and heavy dynamic loading conditions.

Quick Specifications

MaterialAlloy Steel (Quenched & Tempered)
ASTM GradeA490
Washer StandardASTM F436 / F436M
Bolt CompatibilityASTM A490, A325
Hardness38-45 HRC
Diameter RangeM12-M36 / 1/2"-1-1/2"
FinishPlain, Hot Dip Galvanized, Mechanical Zinc
Thickness Tolerance±0.15 mm
Outer DiameterPer ASTM F436 Table 1
CertificationEN 10204 3.1 / 3.2
? All washers tested for hardness and dimensional accuracy. Full traceability and MTC supplied.

Complete the Fastener Set

Other ASTM A490 Fastener Products Available from RealBolt

RealBolt also manufactures the complete ASTM A490 fastener range from certified alloy / carbon steel bar stock, including ASTM A490 Bolts, ASTM A490 Nuts, ASTM A490 Screws, ASTM A490 Studs, and ASTM A490 Threaded Rods. All ASTM A490 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
ASTM A490 Bolts
ASTM A490 Nuts
ASTM A490 Screws
ASTM A490 Studs
ASTM A490 Threaded Rods

Technical Data

ASTM A490 Washers Dimensions, Sizes & Thread Standards

ASTM A490 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per ASTM F436/F436M for hardened steel washers. Metric and inch sizes available. Custom OD and thickness on request for special assemblies. All ASTM A490 washers dimensions are verified against applicable DIN, ISO, and ASME B18 standards before

Hardened Washer Dimensions - ASTM F436 (Inch Series)

Nominal Bolt SizeInside Diameter (min-max, mm)Outside Diameter (min-max, mm)Thickness (min-max, mm)
1/2"13.5-14.328.6-30.23.05-3.56
5/8"16.7-17.534.9-36.53.05-3.56
3/4"20.2-21.044.4-46.03.05-3.56
7/8"23.6-24.450.8-52.44.06-4.57
1"26.9-27.756.0-57.64.06-4.57
1-1/8"30.2-31.063.5-65.14.06-4.57
1-1/4"33.5-34.369.9-71.54.06-4.57
1-3/8"36.8-37.676.2-77.84.06-4.57
1-1/2"40.1-40.982.6-84.24.06-4.57

Dimensional & Material Standards

StandardCoversType
ASTM F436Hardened steel washersInch
ASTM F436MHardened steel washersMetric
ASME B18.22.1Plain & lock washersInch
DIN 125Flat washersMetric
DIN 6916HV washers for structural boltsMetric
ISO 7089Plain washersMetric
Material StandardRequirement
ASTM A490Compatible bolt grade
ASTM F436/F436MWasher mechanical & chemical
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

ASTM A490 Washer Chemical Composition

ASTM A490 Washers are manufactured from chromium-molybdenum alloy steel with Cr (0.8–1.1%), Mo (0.15–0.65%), and vanadium additions in B16 grades, controlled per ASTM and ASME SA-193. Cr-Mo additions raise hardenability and creep rupture strength for pressure vessel service; vanadium in B16 extends the allowable service temperature to 538°C.

Chemical Composition per ASTM F436

ElementComposition (%)
Carbon (C)0.40% max
Manganese (Mn)0.60-0.90%
Phosphorus (P)0.040% max
Sulfur (S)0.050% max
Silicon (Si)0.15-0.35%
Copper (Cu)0.20% max
Nickel (Ni)0.25% max
Chromium (Cr)0.25% max
Molybdenum (Mo)0.06% max
? All heats spectro-tested and certified. Full chemical traceability provided.

Why ASTM A490 Alloy Composition Matters for Washers

High Carbon Content — Strength & Hardening
The controlled carbon content allows for effective quenching and tempering, resulting in the high hardness and strength required for ASTM A490 washer performance in structural joints.
Low Phosphorus & Sulfur — Crack Resistance
Strict limits on phosphorus and sulfur minimize the risk of embrittlement and cracking under heavy loads, ensuring long-term reliability in critical connections.
Alloy Additions — Consistent Mechanical Properties
Manganese and silicon improve toughness and uniformity, while trace alloying elements ensure washers maintain their mechanical properties after heat treatment and during service.

Fastener Performance

ASTM A490 Washers Mechanical Properties & Hardness Reference

The table below lists mechanical properties and hardness reference for ASTM A490 Washers per ASTM. ASTM A490 washers achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Bolt SizeRecommended Washer OD (mm)Recommended Washer Thickness (mm)
M12243.0
M16303.0
M20373.0
M24444.0
M27504.0
M30564.0
M36665.0
?? Washer selection: Always use ASTM F436/F436M washers with A490 bolts to ensure proper load distribution and prevent embedding. Do not substitute with soft or non-hardened washers.

Industry Applications

ASTM A490 Washers Applications — Industries & End Uses

ASTM A490 Washers from RealBolt are specified across oil and gas pressure vessels, power generation, and petrochemical where very good corrosion resistance and 620 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
ASTM A490 washers are specified for use in bolted connections of steel bridges, trusses, and heavy structural frames. Their high hardness and strength ensure reliable load transfer and prevent bolt head or nut embedding, which is critical for long-span and high-load applications.
Used in pre-tensioned and slip-critical joints in high-rise buildings, stadiums, and seismic-resistant structures, ASTM A490 washers maintain joint integrity under dynamic and cyclic loading, reducing the risk of connection failure during earthquakes or wind events.
Essential for bolted connections in heavy machinery bases, crane rails, and equipment foundations, these washers provide consistent clamping force and resist deformation under repeated loading and vibration.
ASTM A490 washers are used in wind turbine tower flanges, transmission towers, and infrastructure projects where high-strength bolted joints are exposed to fatigue, vibration, and harsh weather conditions.

ASTM A490 Washers Standards & International Certifications

ASTM A490 Washers from RealBolt Engineering Industries are manufactured to internationally recognised fastener dimensional standards covering thread form, tolerances, strength grades, and quality requirements. Every batch ships with EN 10204 MTC 3.1/3.2, hardness test certificate, dimensional inspection report, and proof load test records — available on request for all orders.
Standards
DIN 125A DIN 126 DIN 127 DIN 128 DIN 433 DIN 434 DIN 436 DIN 440 DIN 6796 DIN 6797 DIN 9021 ISO 7089 ISO 7090 ISO 7091 ISO 7092 ISO 7093 ISO 7094 ASME B18.21.1 EN ISO 7089 BS 4320 IS 5372 IS 1367
Certifications
ISO 9001:2015EN 10204 3.1 / 3.2CE MarkingPED 2014/68/EUNABL Lab

Buy ASTM A490 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified ASTM A490 Washers — for competitive pricing, EN 10204 MTC 3.1/3.2 documentation, and fast Mumbai dispatch. Standard sizes are ex-stock; custom dimensions accepted with 2–3 week lead time. Request your quote today.
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Answers for Buyers

ASTM A490 Washers — Frequently Asked Questions

Browse expert answers to common questions about ASTM A490 Washers from RealBolt — covering ASTM A193 grade, proof load, creep ratings, cryogenic L7 limits, coating options, and EN 10204 documentation. Contact our technical team directly for project-specific guidance on ASTM A490 washers selection and pricing.
ASTM A490 washers are manufactured to ASTM F436 (inch series) or ASTM F436M (metric series) standards, ensuring compatibility with A490 and A325 structural bolts. They also meet requirements of ASME B18.22.1, DIN 125, and DIN 6916 for flat and HV washers. All washers are supplied with full mechanical and chemical certification.
Yes, ASTM A490 washers are available with hot dip galvanized or mechanical zinc finishes for use with galvanized bolts. The washers are processed to maintain hardness and dimensional tolerances after coating, ensuring proper fit and performance in corrosive or outdoor environments.
ASTM A490 washers, per ASTM F436, have a required hardness of 38-45 HRC. This ensures they are harder than the mating structural steel and prevent embedding or deformation under high pre-loads. Each batch is hardness tested and certified.
Absolutely. ASTM A490 washers are specifically designed for slip-critical and pre-tensioned bolted joints in structural steelwork. Their hardness and flatness ensure consistent clamping force and minimize the risk of joint relaxation or slippage under load.

Industrial Cities We Serve:

  • Ahmedabad
  • Aurangabad
  • Bengaluru
  • Chennai
  • Coimbatore
  • Faridabad
  • Gandhidham
  • Greater Noida
  • Gurugram
  • Hazira
  • Hosur
  • Hyderabad
  • Jamnagar
  • Jamshedpur
  • Ludhiana
  • Mumbai
  • Mundra
  • Mysuru
  • Nagpur
  • Nashik
  • Navi Mumbai
  • Noida
  • Pune
  • Rajkot
  • Sanand
  • Surat
  • Thane
  • Tiruppur
  • Vadodara
  • Visakhapatnam

Countries We Export To:

  • US
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  • Mexico
  • Germany
  • UK
  • France
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  • Norway
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  • Turkey
  • UAE
  • Saudi Arabia
  • Qatar
  • Oman
  • Kuwait
  • Bahrain
  • South Africa
  • Egypt
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