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ASTM A325 Washers Manufacturer & Exporter in India

Explore ASTM A325 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 A325 Washers?

ASTM A325 washers are high-strength, carbon steel flat washers specifically designed for use with ASTM A325 structural bolts in steel construction. These washers are manufactured to provide a smooth, load-distributing surface under the bolt head or nut, preventing galling and embedding in structural steel connections. ASTM A325 washers conform to ASTM F436 standards for mechanical properties and dimensions, ensuring compatibility and performance in critical bolted joints such as bridges, buildings, and heavy steel frameworks.

These washers are heat-treated for hardness and are available in plain, hot-dip galvanized, and mechanically galvanized finishes to suit various corrosion environments. Their use is mandatory in slip-critical and direct-tension connections, as specified by AISC and RCSC guidelines.

Quick Specifications

MaterialCarbon Steel (Heat Treated)
ASTM GradeA325
Washer StandardASTM F436
Finish OptionsPlain, Hot-Dip Galvanized, Mechanical Galvanized
Hardness38-45 HRC
Diameter Range1/2"-1-1/2" (M12-M36)
Thickness3.0-8.0 mm
Outside Diameter24-64 mm
ApplicationStructural Steel Connections
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 A325 Fastener Products Available from RealBolt

RealBolt also manufactures the complete ASTM A325 fastener range from certified alloy / carbon steel bar stock, including ASTM A325 Bolts, ASTM A325 Nuts, ASTM A325 Screws, ASTM A325 Studs, and ASTM A325 Threaded Rods. All ASTM A325 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
ASTM A325 Bolts
ASTM A325 Nuts
ASTM A325 Screws
ASTM A325 Studs
ASTM A325 Threaded Rods

Technical Data

ASTM A325 Washers Dimensions, Sizes & Thread Standards

ASTM A325 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per ASTM F436 for hardened steel washers. Metric and inch sizes available. Custom outside diameters and thicknesses on request. All ASTM A325 washers dimensions are verified against applicable DIN, ISO, and ASME B18 standards before dispatch from

Flat Washer Dimensions - ASTM F436 (Inch Series)

Nominal Bolt SizeInside Dia. (min-max, mm)Outside Dia. (min-max, mm)Thickness (min-max, mm)
1/2"13.5-14.324.0-27.03.0-3.7
5/8"17.0-17.829.0-32.03.7-4.4
3/4"20.6-21.435.0-38.04.4-5.1
7/8"23.9-24.741.0-44.05.1-5.8
1"26.9-27.744.0-51.05.8-6.6
1-1/8"30.2-31.051.0-57.06.6-7.4
1-1/4"33.5-34.357.0-64.07.4-8.1
1-1/2"40.2-41.064.0-70.08.1-8.9

Dimensional & Material Standards

StandardCoversThread
ASTM F436Hardened steel washersPlain/No thread
ASME B18.22.1Plain washers (inch)Plain/No thread
DIN 125Flat washers (metric)Plain/No thread
ISO 7089Flat washers (metric)Plain/No thread
Material StandardRequirement
ASTM A325Structural bolt compatibility
ASTM F436Washer mechanical properties
ASTM A153Hot-dip galvanizing
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

ASTM A325 Washer Chemical Composition

ASTM A325 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)0.55% max
Manganese (Mn)0.60-0.90%
Phosphorus (P)0.04% max
Sulfur (S)0.05% max
Silicon (Si)0.15-0.35%
Iron (Fe)Balance
? All heats verified by spectrometry. Full chemical analysis supplied with each batch.

Why ASTM A325 Alloy Composition Matters for Washers

High Carbon Content — Hardness & Strength
The elevated carbon content ensures the washer can be heat treated to the required hardness (38–45 HRC), preventing embedding and maintaining preload in high-strength bolted joints.
Manganese & Silicon — Toughness & Ductility
Manganese and silicon improve toughness and ductility, allowing the washer to resist cracking under heavy loads and during installation.
Low Phosphorus & Sulfur — Clean Steel
Strict limits on phosphorus and sulfur reduce the risk of brittle fracture and ensure reliable performance in structural applications.

Fastener Performance

ASTM A325 Washers Mechanical Properties & Hardness Reference

The table below lists mechanical properties and hardness reference for ASTM A325 Washers per ASTM. ASTM A325 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 SizeMin Hardness (HRC)Max Hardness (HRC)
1/2"1/2" A3253845
5/8"5/8" A3253845
3/4"3/4" A3253845
7/8"7/8" A3253845
1"1" A3253845
1-1/8"1-1/8" A3253845
1-1/4"1-1/4" A3253845
1-1/2"1-1/2" A3253845
?? Installation: Always use ASTM F436 washers with A325 bolts for slip-critical and direct-tension connections. Do not substitute with non-hardened washers.

Industry Applications

ASTM A325 Washers Applications — Industries & End Uses

ASTM A325 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 A325 washers are essential in bridge construction, used under the head and nut of A325 bolts in girder splices, truss connections, and deck assemblies. Their hardness prevents embedding and ensures consistent preload in critical joints.
Used in steel frame connections, column splices, and beam-to-column joints, ASTM A325 washers distribute load and prevent galling in high-strength bolted assemblies, meeting AISC and RCSC requirements.
Washer sets for process plant structures, crane rails, and heavy machinery bases where vibration and cyclic loading demand reliable load distribution and resistance to bolt loosening.
ASTM A325 washers are specified for bolted connections in wind turbine towers, lattice transmission towers, and substation structures, providing long-term performance in outdoor environments.

ASTM A325 Washers Standards & International Certifications

ASTM A325 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 3.1EN 10204 3.2CE MarkingPED 2014/68/EU

Buy ASTM A325 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified ASTM A325 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 A325 Washers — Frequently Asked Questions

Browse expert answers to common questions about ASTM A325 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 A325 washers selection and pricing.
ASTM A325 washers are governed by ASTM F436, which specifies the chemical, mechanical, and dimensional requirements for hardened steel washers used with structural bolts. For metric sizes, DIN 125 and ISO 7089 are commonly referenced. Always use F436 washers with A325 bolts for code compliance.
Yes, ASTM A325 washers can be supplied hot-dip galvanized per ASTM A153 to match the corrosion protection of galvanized A325 bolts and nuts. Galvanized washers are recommended for outdoor and exposed steelwork to prevent corrosion at the joint interface.
ASTM F436 washers are mandatory for slip-critical and direct-tension connections using A325 bolts, as specified by AISC and RCSC. For snug-tightened connections, their use is strongly recommended to prevent embedding and maintain preload.
Standard sizes (1/2″-1-1/2″) are available ex-stock with no MOQ-single pieces can be supplied for urgent needs. Custom sizes or finishes may require a minimum order of 10 kg. Price breaks are available at 100, 500, and 1000 pieces.

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