+912267437972

+919022636025

enquiry@real-bolt.com

Contact Us

AISI 4340 Threaded Rods Manufacturer & Exporter in India

Explore AISI 4340 Threaded Rods Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
Request a Quote
View Products

-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 AISI 4340 Threaded Rods?

AISI 4340 threaded rods are high-strength alloy steel fasteners manufactured from chromium-nickel-molybdenum steel conforming to ASTM A193 Grade B7 or equivalent. This alloy is renowned for its exceptional toughness, fatigue resistance, and high tensile strength, making it ideal for demanding bolted connections in heavy engineering and critical structural applications.

4340 threaded rods are heat treated to achieve superior mechanical properties, including a minimum tensile strength of 930 MPa and yield strength of 785 MPa. They are widely specified for use in high-stress environments such as oilfield equipment, power generation, and heavy machinery, where both strength and ductility are essential.

Quick Specifications

MaterialAISI 4340 Alloy Steel
UNS NumberG43400
DIN Number1.6565
Material StandardASTM A193 Gr B7 / ASTM A322
Threaded Rod Standard (Metric)DIN 976-1 / ISO 898-1
Threaded Rod Standard (Inch)ASME B18.31.3
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength930 MPa (135 ksi) min
Yield Strength785 MPa (114 ksi) min
HardnessMax 35 HRC / 300 HB
? All material certified by NABL-accredited laboratory. Heat treatment and mechanical test reports available on request.

Complete the Fastener Set

Other AISI 4340 Fastener Products Available from RealBolt

RealBolt also manufactures the complete AISI 4340 fastener range from certified alloy steel bar stock, including AISI 4340 Bolts, AISI 4340 Nuts, AISI 4340 Screws, AISI 4340 Washers, and AISI 4340 Studs. All AISI 4340 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
AISI 4340 Bolts
AISI 4340 Nuts
AISI 4340 Screws
AISI 4340 Washers
AISI 4340 Studs

Technical Data

AISI 4340 Threaded Rods Dimensions, Sizes & Thread Standards

AISI 4340 Threaded Rods are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 976-1 (metric) / ASME B18.31.3 (inch). Custom lengths up to 6 meters. Metric and inch threads available. All AISI 4340 threaded rods dimensions are verified against applicable DIN, ISO, and ASME B18 standards before

Threaded Rod Dimensions - Metric (DIN 976-1)

Size (M)Pitch (mm)Rod Dia (mm)Min L (mm)Max L (mm)
M61.06.01003000
M81.258.01003000
M101.510.01003000
M121.7512.01003000
M162.016.01006000
M202.520.01006000
M243.024.01006000
M303.530.01006000
M364.036.01006000
M424.542.01006000
M485.048.01006000
M565.556.01006000
M646.064.01006000
M726.072.01006000
M806.080.01006000
M1006.0100.01006000

Dimensional & Material Standards

StandardCoversThread
DIN 976-1Threaded rods, metricMetric
ASME B18.31.3Threaded rods, inchUNC/UNF
ISO 898-1Mechanical propertiesMetric
ASTM A193Alloy steel rodsUNC/UNF
Material StandardRequirement
ASTM A193 Gr B74340 alloy steel, heat treated
ASTM A322Bar/rod - AISI 4340
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

AISI 4340 Chemical Composition

AISI 4340 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 ASTM A322

ElementComposition (%)
Carbon (C)0.38-0.43
Manganese (Mn)0.60-0.80
Silicon (Si)0.15-0.30
Nickel (Ni)1.65-2.00
Chromium (Cr)0.70-0.90
Molybdenum (Mo)0.20-0.30
Phosphorus (P)0.035 max
Sulfur (S)0.040 max
Iron (Fe)Balance
? All heats verified by NABL-accredited spectrometry. Chemical test reports available on request.

Why AISI 4340 Alloy Composition Matters for Threaded Rods

Ni (1.65–2.00%) — Toughness & Impact Strength
Nickel content in AISI 4340 provides outstanding toughness and impact resistance, making these threaded rods suitable for dynamic and shock-loaded applications.
Cr & Mo — Hardenability & Strength
Chromium and molybdenum enhance hardenability and high-temperature strength, ensuring the rods maintain mechanical properties after heat treatment and under load.
Low P & S — Clean Steel for Fatigue Life
Strict control of phosphorus and sulfur ensures high fatigue life and resistance to embrittlement, critical for threaded rods in cyclic loading environments.

Fastener Performance

AISI 4340 Threaded Rods Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for AISI 4340 Threaded Rods per ASTM. AISI 4340 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)
M121108840
M1627021680
M20540432125
M24930744180
M3018501480295
M3632002560425
M4251004080590
M4876006080780
?? Anti-galling: Use molybdenum-based anti-seize (Molykote 1000). Lubricated values assume K=0.16. Avoid copper-based anti-seize for high-strength alloy steel.

Industry Applications

AISI 4340 Threaded Rods Applications — Industries & End Uses

AISI 4340 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.
AISI 4340 threaded rods are widely used in oilfield drilling equipment, BOP stacks, and wellhead assemblies where high tensile strength and impact resistance are critical for safety and reliability under dynamic loads.
Threaded rods for crane booms, excavator arms, and structural joints in heavy construction equipment, where fatigue resistance and ductility are essential for long-term performance.
Used for turbine casing tie rods, boiler supports, and pressure vessel closures in thermal and hydroelectric power plants, where high strength and temperature stability are required.
AISI 4340 rods are specified for rock crusher assemblies, dragline machinery, and mining conveyor systems, providing secure bolted joints in abrasive and high-load environments.

AISI 4340 Threaded Rods Standards & International Certifications

AISI 4340 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/EUCE Marking

Buy AISI 4340 Threaded Rods from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified AISI 4340 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.
022-6743-7972
+91 90226 36025
Email Us

Answers for Buyers

AISI 4340 Threaded Rods — Frequently Asked Questions

Browse expert answers to common questions about AISI 4340 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 AISI 4340 threaded rods selection and pricing.
AISI 4340 threaded rods are available in ISO metric threads (DIN 976-1), UNC/UNF (ASME B18.31.3), and custom thread forms such as BSW or BSF on request. Both right-hand and left-hand threads can be supplied. Special pitch and length requirements are available with a typical lead time of 2-3 weeks.
AISI 4340 threaded rods (ASTM A193 Gr B7) are suitable for continuous service up to 450°C. For higher temperatures, alternative grades such as B16 or stainless steel may be recommended. Always consult with our technical team for temperature-specific applications.
Yes – the high nickel and chromium content of AISI 4340 provides excellent toughness and fatigue resistance, making these rods ideal for dynamic, shock, and cyclic loading in heavy machinery, mining, and oilfield applications.
No formal MOQ for standard diameters (M12-M36) held in stock – we supply from single rods for urgent requirements. Custom diameters or lengths may require a minimum order of 10 kg. Quantity discounts are available at 50, 200, and 500 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