"Mehta Metal Industries", founded in 1978 by Babulal Mehta, is one of India's oldest and most trusted suppliers of high-quality stainless steel products.

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AISI 4140 Round Bar Manufacturers in India

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AISI 4140 Round Bar Manufacturers in India – Mehta Metal Industries

Mehta Metal Industries is one of the trusted AISI 4140 round bar manufacturers in India, supplying high-quality AISI 4140 round bar for engineering, automotive, and heavy-duty industrial applications. Our AISI 4140 round bar is manufactured using premium alloy steel with chromium and molybdenum, ensuring high strength, toughness, and wear resistance. We supply AISI 4140 round bar in black bars, bright bars, and forged bars, making them suitable for machining, heat treatment, and critical applications.

AISI 4140 is a versatile alloy steel known for its excellent hardenability and fatigue resistance. Black AISI 4140 round bars are widely used in general engineering applications, bright AISI 4140 round bars are ideal for precision machining, and forged AISI 4140 round bars provide enhanced strength for heavy-duty components. With strong inventory and export capability, we supply AISI 4140 round bar solutions across industries.

4140 alloy steel round bars in India for automotive and engineering applications

AISI 4140 Round Bar Overview

AISI 4140 round bar is widely used in applications where high strength, toughness, and resistance to wear and fatigue are required. Compared to carbon steels like EN8, AISI 4140 round bar offers better hardenability and improved performance under stress.

At Mehta Metal Industries, we supply AISI 4140 round bar in black bars, bright bars, and forged bars to meet diverse industrial requirements. Black AISI 4140 round bars are used in general engineering, bright AISI 4140 round bars provide superior finish for machining, and forged AISI 4140 round bars offer improved internal structure and strength for heavy-duty applications.

AISI 4140 round bar is commonly used in shafts, gears, bolts, studs, and heavy machinery components. Its ability to perform under high load conditions makes AISI 4140 round bar a preferred material in engineering and industrial sectors.

AISI 4140 Round Bar Specifications

Specification Details
Material AISI 4140 Round Bar
Standard ASTM A29 / AISI 4140
Form Round Bar
Finish Black Bars, Bright Bars, Forged Bars
Diameter 6 mm to 500 mm
Length 3m, 6m or custom
Condition Annealed / Quenched & Tempered
Technique Hot Rolled, Cold Drawn, Forged

AISI 4140 round bar is available in black, bright, and forged bars for various industrial applications.

Sizes & Dimensions

Parameter Range
Diameter 6 mm to 500 mm
Length 3m / 6m / Custom
Shape Round
Tolerance As per standards

Custom AISI 4140 round bar sizes are available as per project requirements.

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Mechanical Properties

Property Value
Tensile Strength 850–1000 MPa
Hardness 28–32 HRC (Q&T)
Yield Strength 650–850 MPa
Elongation 12–16%

These properties make AISI 4140 round bar suitable for high-strength applications.

Chemical Composition

Element Composition (%)
Carbon 0.38–0.43
Chromium 0.80–1.10
Molybdenum 0.15–0.25
Manganese 0.75–1.00

AISI 4140 round bar offers excellent strength and toughness due to alloying elements.

Applications of AISI 4140 Round Bar

AISI 4140 round bar is widely used in industries that require high strength, fatigue resistance, and durability under heavy load conditions. These properties make AISI 4140 round bar suitable for critical engineering and industrial applications.

Where is AISI 4140 Round Bar used?

  • Automotive Industry
    AISI 4140 round bar is used in crankshafts, axles, and gears requiring high strength and fatigue resistance.
  • Oil & Gas Industry
    AISI 4140 round bar is used in drilling components and high-strength applications.
  • Heavy Engineering
    AISI 4140 round bar is used in shafts, bolts, and structural components under high stress.
  • Machinery Manufacturing
    AISI 4140 round bar is used in machine parts requiring durability and load-bearing capacity.
  • Industrial Applications
    AISI 4140 round bar is widely used in fabrication and machining operations.

Why is AISI 4140 Round Bar preferred?

  • High strength and toughness
  • Excellent fatigue resistance
  • Good hardenability
  • Suitable for heat treatment
  • Reliable performance in heavy-duty applications

AISI 4140 Round Bar Weight Chart

Diameter Weight (kg/m)
20 mm 2.47
40 mm 9.87
60 mm 22.20
80 mm 39.50
100 mm 61.70

Quality Assurance

At Mehta Metal Industries, quality is a core part of our business philosophy and operational standards. We are committed to maintaining consistency, reliability, and compliance across all our processes, supported by structured quality management systems focused on continuous improvement, documentation control, and process monitoring to meet global industry expectations.

We are certified with multiple international standards that reflect our commitment to quality, safety, and environmental responsibility:

  • ISO 9001:2015 – Quality Management System
  • ISO 14001:2015 – Environmental Management System
  • ISO 45001:2018 – Occupational Health & Safety Management
  • PED (Pressure Equipment Directive 2014/68/EU) Certification

These certifications demonstrate our adherence to global quality benchmarks and regulatory standards.

Our continuous focus ensures alignment with international practices and long-term client trust.

Why Choose Mehta Metal Industries

Industrial buyers and project engineers choose Mehta Metal Industries for reliable alloy steel round bar supply with consistent quality, accurate specifications, and dependable delivery for critical engineering and high-load applications.

  • Advanced Manufacturing
    We use modern machinery and controlled processes to manufacture AISI 4140 round bar with uniform mechanical properties, precise dimensions, and consistent performance across all batches, ensuring reliability in demanding industrial environments.
  • Wide Range of Grades
    We supply AISI 4140 along with EN19, EN24, EN31, and EN8, allowing buyers to source multiple alloy and carbon steel grades for different engineering and industrial applications from a single trusted supplier.
  • Custom Solutions
    We offer customized diameters, lengths, and finishes including black, bright, and forged bars to meet specific machining, fabrication, and project requirements with precision.
  • Bulk Supply Capability
    With strong inventory and production capacity, we efficiently fulfill bulk industrial and export orders while maintaining consistent quality, fast turnaround times, and reliable delivery schedules.
  • Strict Quality Control
    Each product undergoes multiple quality checks to ensure compliance with international standards and performance expectations.
    Every product is tested through:
    • Mechanical testing
    • Ultrasonic inspection
    • Chemical analysis
    • Dimensional inspection
    These checks ensure strength, durability, and consistent performance in critical applications.
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Industries We Serve

Our AISI 4140 round bar is widely used in industries requiring high strength, fatigue resistance, and durability for demanding engineering applications. These industries depend on reliable materials for performance under continuous load and stress conditions.

  • Automotive Industry
    These round bars are used in crankshafts, axles, gears, and other automotive components where high strength, fatigue resistance, and durability are essential.
  • Oil & Gas Industry
    Used in drilling components, shafts, and high-strength applications requiring resistance to pressure, stress, and harsh operating environments.
  • Heavy Engineering
    Used in shafts, fasteners, and structural components exposed to heavy loads, ensuring long service life and reliable performance.
  • Machinery Manufacturing
    Used in machine parts requiring toughness, wear resistance, and the ability to perform under continuous operational stress.
  • Industrial Manufacturing
    Widely used in machining, fabrication, and production processes requiring consistent quality, strength, and dimensional accuracy.

Frequently Asked Questions

  • What is AISI 4140 round bar used for?
    AISI 4140 round bar is widely used in shafts, gears, bolts, and heavy-duty engineering components requiring high strength and fatigue resistance.
  • Is AISI 4140 better than EN8?
    Yes, AISI 4140 offers higher strength, better hardenability, and improved fatigue resistance compared to EN8, making it suitable for demanding applications.
  • What is the hardness of AISI 4140 steel?
    AISI 4140 typically has a hardness of around 28–32 HRC in quenched and tempered condition, which can vary based on treatment.
  • Is AISI 4140 suitable for shafts?
    Yes, AISI 4140 is one of the most commonly used materials for shafts due to its strength, toughness, and fatigue resistance.
  • What finishes are available in AISI 4140 round bar?
    These round bars are available in black, bright, and forged conditions, suitable for general engineering, precision machining, and heavy-duty applications.
  • Can AISI 4140 be welded?
    Yes, AISI 4140 can be welded, but preheating and post-weld heat treatment are recommended to avoid cracking and maintain strength.

Request a Quote

Looking for a reliable AISI 4140 round bar manufacturer in India? Mehta Metal Industries supplies high-quality AISI 4140 round bar for engineering, automotive, and heavy-duty industrial applications with consistent quality and performance.

We offer a wide range of sizes and finishes including black, bright, and forged bars, along with competitive pricing tailored to your requirements. Whether you need material for precision machining or bulk supply for large-scale projects, we ensure smooth coordination, quick response, and dependable delivery.

Contact us today to discuss your requirements, get technical assistance, or receive a fast and competitive quote for your AISI 4140 round bar needs.

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