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ASTM A307 Grade A Washers Manufacturer & Exporter in India

Explore ASTM A307 Grade A 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 A307 Grade A Washers?

ASTM A307 Grade A washers are general-purpose carbon steel flat washers manufactured to complement ASTM A307 Grade A bolts and studs. These washers are designed for use in low-carbon, low-strength bolted assemblies where moderate mechanical properties are sufficient. They provide a smooth, load-distributing bearing surface under bolt heads and nuts, preventing embedment and damage to connected materials.

ASTM A307 Grade A washers are widely specified for structural steelwork, piping supports, and general construction applications. They are available in plain, zinc-plated, and hot-dip galvanized finishes to suit indoor and outdoor environments. All washers are produced from steel conforming to ASTM A36 or equivalent, ensuring consistent ductility and performance in service.

Quick Specifications

MaterialCarbon Steel
ASTM GradeA307 Grade A
Material StandardASTM A36 / ASTM A307
Washer Standard (Metric)DIN 125 / ISO 7089
Washer Standard (Inch)ASME B18.22.1
Finish OptionsPlain, Zinc Plated, Hot-Dip Galvanized
Diameter RangeM6-M64 / 1/4"-2-1/2"
Tensile StrengthMin 414 MPa (60 ksi)
Yield StrengthMin 250 MPa (36 ksi)
HardnessMax 85 HRB
? All washers supplied with full traceability and test certification. Third-party inspection available.

Complete the Fastener Set

Other ASTM A307 Grade A Fastener Products Available from RealBolt

RealBolt also manufactures the complete ASTM A307 Grade A fastener range — ASTM A307 Grade A Bolts, ASTM A307 Grade A Nuts, ASTM A307 Grade A Screws, ASTM A307 Grade A Studs, ASTM A307 Grade A Threaded Rods — from certified bar stock per ASTM with full EN 10204 MTC 3.1/3.2 documentation and fast Mumbai dispatch.
ASTM A307 Grade A Bolts
ASTM A307 Grade A Nuts
ASTM A307 Grade A Screws
ASTM A307 Grade A Studs
ASTM A307 Grade A Threaded Rods

Technical Data

ASTM A307 Grade A Washers Dimensions, Sizes & Thread Standards

ASTM A307 Grade A Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat washer) / ISO 7089 (plain washer) / ASME B18.22.1 (inch series). Custom outside and inside diameters available on request. All ASTM A307 Grade A washers dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Flat Washer Dimensions - Metric (DIN 125 / ISO 7089)

Size (M)Inside Dia. (mm)Outside Dia. (mm)Thickness (mm)
M66.4121.6
M88.4161.6
M1010.5202.0
M1213.0242.5
M1617.0303.0
M2021.0373.0
M2425.0444.0
M3031.0564.0
M3637.0665.0
M4243.0756.0
M4849.0856.0
M5657.01008.0
M6465.01158.0

Dimensional & Material Standards

StandardCoversType
DIN 125Flat washersMetric
ISO 7089Plain washersMetric
ASME B18.22.1Plain & flat washersInch
DIN 9021Large OD washersMetric
BS 4320Form A/B/C/D washersMetric
Material StandardRequirement
ASTM A36Carbon steel base material
ASTM A307Mechanical properties
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

ASTM A307 Grade A Chemical Composition

ASTM A307 Grade A 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 A36 / A307

ElementComposition (%)
Carbon (C)0.26% max
Manganese (Mn)0.60-0.90%
Phosphorus (P)0.04% max
Sulfur (S)0.05% max
Silicon (Si)0.15-0.40%
Iron (Fe)Balance
? All heats verified by spectrometry. Material test certificates supplied with every batch.

Why ASTM A307 Grade A Alloy Composition Matters for Washers

Low Carbon Content — Ductility & Formability
The low carbon content (=0.26%) ensures ASTM A307 Grade A washers are ductile and easily formed, reducing the risk of cracking during stamping and installation.
Manganese & Silicon — Strength & Toughness
Manganese and silicon additions provide moderate strength and toughness, making these washers suitable for general construction and structural applications.
Phosphorus & Sulfur Control — Reliable Performance
Strict limits on phosphorus and sulfur minimize the risk of embrittlement, ensuring consistent performance in bolted joints under static and dynamic loads.

Fastener Performance

ASTM A307 Grade A Washers Mechanical Properties & Torque & Proof Load Reference

The table below lists mechanical properties and proof load reference for ASTM A307 Grade A Washers per ASTM. ASTM A307 Grade A washers achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Washer SizeRecommended Bolt SizeTypical Torque (Nm)
M8M825-30
M10M1045-55
M12M1275-85
M16M16150-170
M20M20300-340
M24M24520-580
M30M301000-1100
?? Note: Torque values are for reference only and depend on bolt grade, lubrication, and assembly conditions. Always follow project specifications.

Industry Applications

ASTM A307 Grade A Washers Applications — Industries & End Uses

ASTM A307 Grade A 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 A307 Grade A washers are widely used in structural steelwork, including beam-to-column connections, base plate assemblies, and bracing joints. They provide a reliable bearing surface for ASTM A307 bolts in bridges, buildings, and infrastructure projects.
Flat washers are specified for machinery assembly, equipment mounting, and general fabrication where moderate strength and cost-effective fastening are required. Suitable for use with carbon steel bolts and nuts in non-critical applications.
Washers are used in pipe support brackets, hangers, and clamps to distribute load and prevent damage to painted or galvanized surfaces. Common in HVAC, fire protection, and water treatment installations.
ASTM A307 Grade A washers are supplied to OEMs for use in agricultural equipment, conveyors, and light machinery. Also used in plant maintenance and repair for general bolted joints.

ASTM A307 Grade A Washers Standards & International Certifications

ASTM A307 Grade A 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 3.1PED 2014/68/EUCE Marking

Buy ASTM A307 Grade A Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified ASTM A307 Grade A 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 A307 Grade A Washers — Frequently Asked Questions

Browse expert answers to common questions about ASTM A307 Grade A 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 A307 Grade A washers selection and pricing.
ASTM A307 Grade A washers are typically supplied to DIN 125 (metric flat), ISO 7089 (plain), and ASME B18.22.1 (inch series) standards. Large OD and special form washers are available to DIN 9021 and BS 4320. All washers are manufactured from steel conforming to ASTM A36 or equivalent, ensuring compatibility with A307 bolts and nuts.
Yes, ASTM A307 Grade A washers can be supplied hot-dip galvanized to ASTM F2329 or ISO 1461 for enhanced corrosion resistance in outdoor and structural applications. Galvanized washers are recommended for use with galvanized bolts and nuts to prevent bimetallic corrosion and ensure consistent clamping force.
Absolutely. ASTM A307 Grade A washers are widely used in structural steel connections, including beam-to-column joints, base plates, and bracing. They provide a reliable bearing surface and help prevent embedment of bolt heads and nuts into softer base materials.
Standard sizes (M8-M30, 5/16″-1-1/4″) are available ex-stock with no formal MOQ-single-piece orders are accepted for urgent requirements. Custom sizes or finishes may require a minimum order of 25 kg or 500 pieces, depending on production batch. Quantity discounts apply for larger orders.

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
  • Canada
  • Mexico
  • Germany
  • UK
  • France
  • Italy
  • Spain
  • Netherlands
  • Belgium
  • Poland
  • Sweden
  • Norway
  • Denmark
  • Turkey
  • UAE
  • Saudi Arabia
  • Qatar
  • Oman
  • Kuwait
  • Bahrain
  • South Africa
  • Egypt
  • Nigeria
  • Australia
  • New Zealand
  • Singapore
  • Malaysia
  • Indonesia
  • Thailand
  • Vietnam
  • South Korea
  • Japan
  • Brazil