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EN 24 (4340 Equiv.) Washers Manufacturer & Exporter in India

Explore EN 24 (4340 Equiv.) 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 EN 24 (4340 Equiv.) Washers?

EN 24 (4340 Equivalent) washers are high-strength alloy steel flat or shaped washers manufactured from EN 24 (AISI 4340) bar or plate, conforming to BS 970 and ASTM A322 standards. This alloy is renowned for its excellent toughness, high tensile strength, and fatigue resistance, making it ideal for critical bolted joints in demanding mechanical and structural applications.

EN 24 washers are typically supplied in the hardened and tempered condition (usually 32-38 HRC), providing superior load distribution and resistance to embedding under high clamp loads. They are widely specified in heavy engineering, automotive, and aerospace assemblies where standard carbon steel washers would fail due to deformation or wear.

Quick Specifications

MaterialEN 24 (AISI 4340 Equivalent)
UNS NumberG43400
DIN Number1.6511
Material StandardBS 970:1991 / ASTM A322
Washer Standard (Metric)DIN 125 / DIN 127 / DIN 7989
Washer Standard (Inch)ASME B18.22.1
TypeFlat, Spring, Taper, Spherical
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength850-1000 MPa (123-145 ksi)
Yield Strength680 MPa (99 ksi) min
Hardness32-38 HRC
? All EN 24 washers supplied with full traceability and hardness certification. Third-party inspection available.

Complete the Fastener Set

Other EN 24 (4340 Equiv.) Fastener Products Available from RealBolt

RealBolt also manufactures the complete EN 24 (4340 Equiv.) fastener range — EN 24 (4340 Equiv.) Bolts, EN 24 (4340 Equiv.) Nuts, EN 24 (4340 Equiv.) Screws, EN 24 (4340 Equiv.) Studs, EN 24 (4340 Equiv.) Threaded Rods — from certified bar stock per ASTM with full EN 10204 MTC 3.1/3.2 documentation and fast Mumbai dispatch.
EN 24 (4340 Equiv.) Bolts
EN 24 (4340 Equiv.) Nuts
EN 24 (4340 Equiv.) Screws
EN 24 (4340 Equiv.) Studs
EN 24 (4340 Equiv.) Threaded Rods

Technical Data

EN 24 (4340 Equiv.) Washers Dimensions, Sizes & Thread Standards

EN 24 (4340 Equiv.) Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat), DIN 127 (spring), DIN 7989 (structural), and ASME B18.22.1. Custom OD/ID and thickness available. Inch and metric sizes supplied to order.

Flat Washer Dimensions - Metric (DIN 125)

Size (M)Inner Dia (mm)Outer 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
M4243.0786.0
M4849.0926.0
M5657.01058.0
M6465.01158.0
M7273.013010.0
M8081.014010.0
M100101.018012.0

Dimensional & Material Standards

StandardCoversType
DIN 125Flat washersMetric
DIN 127Spring lock washersMetric
DIN 7989Heavy-duty structural washersMetric
ASME B18.22.1Plain & lock washersInch
BS 4320Metric & inch washersMetric/Inch
Material StandardRequirement
BS 970:1991EN 24 bar/plate
ASTM A3224340 alloy steel
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

EN 24 (4340 Equiv.) Chemical Composition

EN 24 (4340 Equiv.) Washers are produced from medium-carbon or alloy steel with carbon (0.15–0.55%), chromium, manganese, and boron additions controlled per ASTM and ISO 898-1. Carbon content and quench-and-temper heat treatment are the primary strength levers, delivering proof loads from 580 MPa (Class 8.8) to 970 MPa (Class 12.9).

Chemical Composition per BS 970 / ASTM A322

ElementComposition (%)
Carbon (C)0.36-0.44
Silicon (Si)0.10-0.35
Manganese (Mn)0.45-0.70
Nickel (Ni)1.30-1.80
Chromium (Cr)0.50-1.00
Molybdenum (Mo)0.20-0.35
Sulphur (S)0.035 max
Phosphorus (P)0.035 max
Iron (Fe)Balance
? All heats spectro-tested and certified. Chemical analysis report supplied with every batch.

Why EN 24 (4340 Equiv.) Alloy Composition Matters for Washers

Ni-Cr-Mo Alloying — Strength & Toughness
The combination of nickel, chromium, and molybdenum in EN 24 provides outstanding tensile strength and impact resistance, ensuring washers resist deformation and maintain preload under dynamic loads.
Low Impurity Levels — Fatigue Life
Strict control of sulphur and phosphorus content minimizes the risk of crack initiation, extending the fatigue life of washers in cyclic loading environments such as rotating machinery and automotive assemblies.
Hardenability — Consistent Performance
EN 24’s chemistry allows through-hardening, ensuring uniform hardness and mechanical properties across the washer, even in thick sections or large diameters.

Fastener Performance

EN 24 (4340 Equiv.) Washers Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for EN 24 (4340 Equiv.) Washers per ASTM. EN 24 (4340 Equiv.) 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 Thickness (mm)Max Clamp Load (kN)
M12242.560
M16303.095
M20373.0150
M24444.0210
M30564.0340
M36665.0490
M42786.0670
M48926.0870
?? Installation: Always use hardened EN 24 washers with high-strength bolts to prevent embedding and maintain preload. Lubricate contact surfaces for consistent torque.

Industry Applications

EN 24 (4340 Equiv.) Washers Applications — Industries & End Uses

EN 24 (4340 Equiv.) Washers from RealBolt are specified across structural engineering, automotive, machinery, and pressure vessels where very good corrosion resistance and 620 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
EN 24 washers are used in critical bolted joints of heavy-duty gearboxes, presses, cranes, and rolling mills, where high clamp loads and shock resistance are essential for operational safety and reliability.
Flat and spring washers for suspension assemblies, drive shafts, and engine mounts in performance vehicles and commercial trucks, providing consistent preload and resisting fatigue under dynamic loading.
EN 24 washers are specified for landing gear, actuator assemblies, and structural joints in aircraft and defence vehicles, where high strength-to-weight ratio and impact resistance are required.
Used in pressure vessel closures, pipeline flanges, and drilling rig assemblies, EN 24 washers ensure secure, leak-free joints in high-pressure, high-vibration environments.

EN 24 (4340 Equiv.) Washers Standards & International Certifications

EN 24 (4340 Equiv.) 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 9001:2015NABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy EN 24 (4340 Equiv.) Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified EN 24 (4340 Equiv.) 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

EN 24 (4340 Equiv.) Washers — Frequently Asked Questions

Browse expert answers to common questions about EN 24 (4340 Equiv.) Washers from RealBolt — covering property class, tensile and proof load, galvanizing embrittlement risk, surface finishes, and dimensional certification. Contact our technical team directly for project-specific guidance on EN 24 (4340 Equiv.) washers selection and pricing.
EN 24 (4340 Equiv.) washers are available to DIN 125 (flat), DIN 127 (spring), DIN 7989 (structural), BS 4320, and ASME B18.22.1 (inch). Custom OD, ID, and thickness can be supplied to drawing or special standards. All washers are manufactured from certified EN 24/4340 alloy steel and supplied with full traceability.
Yes – EN 24 washers are specifically designed for use with high-strength bolts (such as ASTM A193 B7, EN 24, or 10.9/12.9 grades). Their high hardness and toughness prevent embedding and maintain preload under heavy clamp loads, making them ideal for critical bolted joints in heavy machinery and structural applications.
EN 24 washers maintain their mechanical properties up to 450°C, making them suitable for use in engine assemblies, turbines, and other high-temperature environments. For continuous service above 450°C, consult our engineering team for alternative alloy recommendations.
No MOQ for standard sizes (M12-M36) available ex-stock – we supply from single pieces for urgent maintenance. Custom sizes or special profiles typically require a 10 kg minimum. Price breaks are available at 50 pcs, 200 pcs, and 500 pcs.

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
  • 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
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  • Vietnam
  • South Korea
  • Japan
  • Brazil