Alloy Steel 4140 Round Bar – AISI 4140 Alloy Steel Rod, Hex, Flat & Forged Bars Suppliers
Alloy Steel 4140 Round Bars are high strength chromium-molybdenum steel bars, which have broad applications in automotive, oil & gas, aerospace, construction and engineering sectors. AISI 4140 alloy steel round bars are available in round, flat, square, and hexagon shapes with heat-treated and customized choices. It is known for good toughness, wear resistance, machinability, and fatigue strength.
AISI 4140 Alloy Steel Round Bars Supplier in India
We are the reputed exporters and suppliers of top grade AISI 4140 alloy steel round bars as per international standards. These alloy steel bars are manufactured from high-grade chromium and molybdenum alloy steel to provide outstanding mechanical strength, corrosion resistance, and durability in demanding industrial applications.
Our extensive inventory includes:
- AISI 4140 Round Bar
- ASTM A29 4140 Steel Rod
- UNS G41400 Hex Bars
- AISI 4140 Flat Bar
- AISI 4140 Steel Bar
- EN19 Steel Round Bars
- Alloy Steel 4140 Bright Bars
- 4140 Forged Bars
- 4140 Black Bars
We supply customized dimensions, cut lengths, heat-treated conditions, and surface finishes according to customer project requirements.
What is Alloy Steel 4140?
AISI 4140 is a chromium-molybdenum low alloy steel with good toughness, high fatigue strength, good impact resistance and good wear resistance. It is usually provided in hardened and tempered conditions for severe demanding engineering applications.
Chromium increases hardness and corrosion resistance, whereas molybdenum increases strength at high temperatures. The AISI 4140 steel bar is widely utilized in many industrial applications because to its outstanding machinability and weldability.
Equivalent Grades
| Standard | Grade |
| ASTM | A29 4140 |
| UNS | G41400 |
| DIN | 1.7225 |
| EN | EN19 |
| JIS | SCM440 |
Types of AISI 4140 Steel Bars We Supply
AISI 4140 Round Bar
Widely used for shafts, gears, bolts, fasteners, and heavy-duty machinery components due to its excellent strength-to-weight ratio.
ASTM A29 4140 Steel Rod
Manufactured according to ASTM standards for structural and mechanical engineering applications requiring superior toughness.
UNS G41400 Hex Bars
Used in precision machining and fastener manufacturing where dimensional accuracy and strength are critical.
AISI 4140 Flat Bar
Preferred in construction, tooling, dies, and industrial fabrication applications.
EN19 Steel Round Bar
EN19 steel bars are equivalent to 4140 alloy steel and are highly demanded in automotive and oilfield industries.
Key Features of AISI 4140 Alloy Steel Round Bars
- High Tensile Strength: 4140 steel bars provide exceptional strength and toughness under high-stress conditions.
- Excellent Wear Resistance: Suitable for components exposed to friction and heavy mechanical loads.
- Good Machinability: The material can be easily machined, forged, and heat-treated.
- Heat Treatable: Can be hardened and tempered to achieve desired mechanical properties.
- Corrosion & Fatigue Resistance: Performs well in harsh industrial and outdoor environments.
Available Sizes & Specifications of 4140 Bars
| Specification | Details |
| Standard | ASTM A29 / A322 |
| Grade | AISI 4140 / UNS G41400 |
| Form | Round, Flat, Square, Hex |
| Diameter | 4 mm to 500 mm |
| Length | 1 Meter to 6 Meter |
| Finish | Black, Bright, Polished |
| Condition | Annealed, Hardened, Tempered |
Chemical Composition of Alloy Steel 4140 Round Bars
| Element | Composition (%) |
| Carbon | 0.38 – 0.43 |
| Chromium | 0.80 – 1.10 |
| Manganese | 0.75 – 1.00 |
| Molybdenum | 0.15 – 0.25 |
| Silicon | 0.15 – 0.35 |
| Phosphorus | 0.035 Max |
| Sulfur | 0.040 Max |
Mechanical Properties of ASTM A29 4140 Steel Rod
| Property | Value |
| Tensile Strength | 655 MPa |
| Yield Strength | 415 MPa |
| Elongation | 25% |
| Hardness | 197 HB |
| Density | 7.85 g/cm³ |
Applications of Alloy Steel 4140 Steel Bars
Our AISI 4140 round bars are extensively used in:
- Automotive Industry
- Oil & Gas Industry
- Aerospace Components
- Power Generation Plants
- Heavy Engineering
- Construction Equipment
- Hydraulic Machinery
- Marine Applications
- Petrochemical Industry
- Tool & Die Manufacturing
Typical applications include:
- Shafts
- Gears
- Axles
- Studs
- Couplings
- Spindles
- Drill Collars
- Machine Parts
4140 Chromoly Round Bar Suppliers USA
We are among the preferred 4140 chromoly round bar suppliers USA customers trust for consistent quality and dependable service. Our alloy steel bars meet ASTM, ASME, and international quality standards for industrial and engineering applications.
The USA market widely uses 4140 chromoly steel for:
- Automotive racing components
- Aircraft landing gear
- Oil drilling tools
- Heavy machinery shafts
- Industrial fasteners
Related Alloy Bars/Rods Grades
Why Choose Us as 4140 Steel Round Bar Stockists?
As experienced 4140 steel round bar stockists, we focus on supplying high-quality alloy steel products with reliable documentation and fast delivery.
Our Advantages
- Large Ready Stock
- Third-Party Inspection
- Competitive Pricing
- Custom Cutting Services
- Worldwide Export Supply
- Mill Test Certificates
- On-Time Delivery
- International Quality Standards
We export alloy steel products to USA, UAE, Saudi Arabia, Europe, and other global markets.
Looking for High-Quality Alloy Steel 4140 Round Bars?
Contact us today for the latest prices, technical support, customized sizes, and fast worldwide delivery of ASTM A29 4140 steel rods and AISI 4140 alloy steel round bars.
Global Reach
ASC LLP boasts a robust global presence, committed to delivering unparalleled service and quality to clients around the world. Our dedication to prompt delivery and exceptional customer care sets us apart in the industry. Major corporations across the USA, Europe, Asia, and other regions place their trust in our high-quality 4140 Round Bar. This widespread trust underscores our reputation for reliability and excellence. By consistently meeting and exceeding the expectations of our international clientele, we continue to solidify our position as a leader in the global steel market.
Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.
