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

Explore EN 24 (4340 Equiv.) Threaded Rods 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.) Threaded Rods?

EN 24 (4340 Equivalent) threaded rods are high-strength alloy steel fasteners manufactured from EN 24 (AISI 4340) bar stock, a nickel-chromium-molybdenum alloy renowned for its exceptional toughness and fatigue resistance. These rods are supplied in the quenched and tempered condition, delivering tensile strengths up to 1080 MPa and superior impact properties, making them ideal for critical bolted joints subjected to dynamic loads.

EN 24 threaded rods are widely specified for heavy-duty mechanical assemblies, structural connections, and high-stress applications in automotive, aerospace, and general engineering sectors. Their through-hardening capability and uniform mechanical properties across large diameters set them apart from standard carbon steel rods.

Quick Specifications

MaterialEN 24 (AISI 4340 Equivalent)
UNS NumberG43400
DIN Number1.6511
Material StandardBS 970-3:1991 / ASTM A322
Rod Standard (Metric)DIN 976-1 / ISO 898-1
Rod Standard (Inch)ASME B18.31.3
Thread FormISO Metric / UNC / UNF
Diameter RangeM8-M100 / ?"-4"
Tensile Strength850-1080 MPa (123-157 ksi)
Yield Strength680 MPa (99 ksi) min
Hardness28-36 HRC
? All material certified by NABL-accredited laboratory. Ultrasonic and MPI test reports available on request.

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.) Washers, EN 24 (4340 Equiv.) Studs — 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.) Washers
EN 24 (4340 Equiv.) Studs

Technical Data

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

EN 24 (4340 Equiv.) Threaded Rods are available in metric M6–M100 and inch ¼″–4″ as standard. Manufactured per DIN 976-1 (metric) and ASME B18.31.3 (inch). Custom cut lengths available in 10 mm increments. Inch and metric threads supplied as per order specification.

Threaded Rod Dimensions - Metric (DIN 976-1)

Size (M)Pitch (mm)Rod Dia (mm)Min L (mm)Max L (mm)
M81.2581002000
M101.5101003000
M121.75121003000
M162.0161004000
M202.5201004000
M243.0241004000
M303.5301006000
M364.0361006000
M424.5421006000
M485.0481006000
M565.5561006000
M646.0641006000
M726.0721006000
M806.0801006000
M1006.01001006000

Dimensional & Material Standards

StandardCoversThread
DIN 976-1Threaded rods, metricMetric
ASME B18.31.3Threaded rods, inchUNC/UNF
ISO 898-1Mechanical propertiesMetric
BS 3692General fastenersMetric
Material StandardRequirement
BS 970-3:1991EN 24 alloy steel
ASTM A3224340 bar/rod
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

EN 24 (4340 Equiv.) Chemical Composition

EN 24 (4340 Equiv.) Threaded Rods 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 970-3:1991 / 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)0.90-1.40
Molybdenum (Mo)0.20-0.35
Sulphur (S)0.035 max
Phosphorus (P)0.035 max
? All heats verified by NABL-accredited spectrometry. Full chemical test reports supplied with every batch.

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

Ni-Cr-Mo Alloying — High Strength & Toughness
The combination of nickel, chromium, and molybdenum in EN 24 (4340) provides outstanding tensile strength, ductility, and impact resistance, making these rods ideal for dynamic and shock-loaded assemblies.
Through Hardening Capability
EN 24 threaded rods can be heat treated to achieve uniform hardness and strength throughout large diameters, ensuring reliable performance in critical bolted joints and heavy machinery.
Superior Fatigue Resistance
The alloy’s balanced composition delivers excellent fatigue life, essential for threaded rods used in rotating equipment, drive assemblies, and high-cycle load environments.

Fastener Performance

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

The table below lists mechanical properties and torque reference for EN 24 (4340 Equiv.) Threaded Rods per ASTM. EN 24 (4340 Equiv.) threaded rods achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Rod SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M121209645
M1629523690
M20580464140
M241000800200
M3020001600320
M3634002720460
M4252004160640
M4875006000860
?? Anti-galling: Use molybdenum-based anti-seize for alloy steel. Lubricated values assume K=0.16. Always verify torque for critical applications.

Industry Applications

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

EN 24 (4340 Equiv.) Threaded Rods 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 threaded rods are used for bolting large gearboxes, press frames, and heavy-duty machine beds where high tensile strength and fatigue resistance are essential for structural integrity and vibration resistance.
Critical engine and drivetrain assemblies, such as connecting rod bolts, flywheel studs, and suspension linkages, rely on EN 24 rods for their ability to withstand cyclic loading and shock without failure.
EN 24 (4340) threaded rods are specified for high-pressure flange connections, BOP stacks, and subsea riser assemblies where superior mechanical properties and impact toughness are required under dynamic loads.
Used in landing gear, actuator assemblies, and structural joints, EN 24 rods provide the strength and reliability needed for safety-critical aerospace and military hardware.

EN 24 (4340 Equiv.) Threaded Rods Standards & International Certifications

EN 24 (4340 Equiv.) Threaded Rods 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 975 DIN 976-1 ASME B18.31.2 IS 1367 IS 1364 SAE J429
Certifications
ISO 9001:2015EN 10204 3.1 / 3.2NABL LabPED 2014/68/EU

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

Partner with RealBolt — India’s leading manufacturer of certified EN 24 (4340 Equiv.) Threaded Rods — 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.) Threaded Rods — Frequently Asked Questions

Browse expert answers to common questions about EN 24 (4340 Equiv.) Threaded Rods 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.) threaded rods selection and pricing.
EN 24 (4340) threaded rods are available with ISO metric threads (DIN 976-1), UNC/UNF (ASME B18.31.3), and custom thread forms such as BSW, BSF, and ACME. Metric coarse and fine pitches are supplied as standard. Special threads can be manufactured to order with a typical lead time of 2-3 weeks.
For EN 24 (4340) alloy steel, use a molybdenum-based anti-seize (such as Molykote 1000 or Loctite LB 8012) to prevent galling and facilitate disassembly. Avoid copper-based anti-seize in high-temperature or corrosive environments. Always apply to both threads and nut bearing surfaces for optimal performance.
EN 24 (4340) threaded rods are suitable for continuous service up to 450°C. For applications above this temperature, consider alternative alloys such as 17-4PH or Inconel. Always consult with engineering for applications involving thermal cycling or elevated temperatures.
Standard sizes (M12-M36) are available ex-stock with no formal MOQ – single rods can be supplied for urgent requirements. Custom diameters or lengths typically require a 10 kg minimum order. Bulk discounts are available at 50, 200, and 500 piece price breaks.

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