top of page

SAE 4140 | AISI 4140 
SAE 4140 Round Bar Supplier | UNS G41400 Chrome-Moly Alloy steel | AISI 4140 Forged Bar Supplier | SAE 4140 Bright Bar Manufacturer 

AISI 4140 is a chrome-molybdenum high tensile strength steel. National Steel Industries is one of the biggest SAE 4140 round bars suppliers in India and worldwide. The material is free from any defects and can be provided in forged condition. We also supply premium quality AISI 4140h steel. SAE 4140h specification include additional hardness as compared to SAE 4140. Buy SAE 4140 round bars online from National Steel Industries.


SAE 4140 equivalent grade is AISI 4140. SAE 4140 UNS equivalent is UNS G41400. AISI 4140 corrosion resistance properties find its application in shipbuilding and the oil drilling industry to make gears, drills, shafts, etc. SAE 4140 hardness is high as compared to other steel grade standards. SAE 4140 is also suitable for low temperature uses and also cold-forged, and bright bars are made out of 4140 steel. We have ready stock material of AISI 4140 in sizes 20mm to 190mm dia.

SAE 4140 QT round bars and forged bars are also available of superior strength. AISI 4140 steel technical datasheet and SAE 4140 tempering curve data predict that the material can be performed with heat treatments such as quenching, tempering, annealing, and normalization. National Steel Industries provides SAE 4140 round bars which are tested for a variety of parameters and provided with a free material test certificate.

Mentioned below are SAE 4140 chemical composition and SAE 4140 mechanical properties: 

​EN27  En 27 Alloy Steel | Heat Treated bars of En27 | EN 27 Round Bar supplier | EN27 Bright Bars | EN27 Forged Round Bar Suppliers | EN 27 Blocks | EN 27 Billets |

SAE 4140 Chemical Composition

The Chemical Composition of AISI 4140 contains a carbon content of 0.38 - 0.43 %. The material has an Mn content of 0.70 - 1.00 %. Due to high carbon and manganese content, the material is relatively hard. The contents of P are reduced to 0.035 % and S is reduced to 0.040 % max as excess content of P and S can damage the quality of steel and can cause the alloys steel to break at low stresses. There is a high Chromium content of 0.80-1.10 % which adds additional yield and tensile on heat treatment. There is also a Molybdenum content of 0.15-0.25 %.

Chemical Composition of SAE 4140

C%:       0.38-0.43
Mn%:     0.75-1.00
P%:        0.035 max
S%:        0.040 max
Si%:       0.15-0.30
Ni%:       -
Cr%:      0.80-1.10
Mo%:     0.15-0.25

 SAE 4140 Mechanical Properties

Compared to other grades of steel, SAE 4140 steel has high tensile strength. The AISI 4140 alloy steel is hard and finds application in hard machine parts. It has good ductility, extreme toughness, and good wear resistance in quenched and tempered conditions.  SAE 4140 tensile strength ranges from 455-1598 MPa. AISI 4140 yield strength ranges from 338-986 MPa. AISI 4140 density is high. The Types of Heat treatment can vary the mechanical properties of the material. Strength Test, Impact Test, Brinell Hardness Test, Fracture Toughness, and Durability Tests are the tests that are performed by us on SAE 4140. The AISI 4140 physical properties are listed below:

Property                     Value

Tensile Strength       455-1598 MPa
Yield Strength         338-986 MPa
Elongation               7-21%

Hardness                 196-397 HB

SAE 4140 Heat Treatments

  • Forging or hot rolling

  • Normalizing

  • Soft annealing 

  • Core hardening

  • Intermediate annealing

  • Case hardening

  • Tempering

  • Carburising

National Steel Industries is one of the biggest suppliers, exporters and Stockist of SAE 4140 material.

Buy AISI 4140 round bars at the best price from us which is tested for a variety of parameters and delivered with a material test certificate for complete quality assurance.


SAE 4140 Round Bars | AISI 4140 Round Bars | National Steel Industries | Mumbai

SAE 4140 Round Bar | AISI 4140 Alloy Steel Round Bar

SAE 4140 Flat Bars | AISI 4140 Flat Bars | National Steel Industries | India | Mumbai

SAE 4140 Flat Bars |AISI 4140 Alloy Steel Flat Bars

SAE 4140 Forged Round Bars | AISI 4140 Forged Alloy Steel Round Bars | National Steel Industries | India | Mumbai

SAE 4140 Forged Round Bars |AISI 4140 Alloy Steel Round Bars

SAE 4140 Forged Blocks | AISI 4140 Forged Blocks| National Steel Industries | India | Mumbai

SAE 4140 Forged Blocks| AISI 4140 Alloy Steel Forged Blocks

SAE 4140 Bright Bars | AISI 4140 Alloy steel Bright Bars | National Steel Industries | India | Mumbai

SAE 4140 Bright Round Bars | AISI 4140 Alloy Steel Bright Bars

SAE 4140 Billets | AISI 4140 Billets | National Steel Industries | India | Mumbai

SAE 4140 Billets| AISI 4140 Alloy Steel Billets


Standard Length Bars are available in Sizes:




The Length can be cut and customized as per the customer's requirements.

Sizes  national Steel Industries  India  Mumbai.png

Round Bars Size

Product Name 

SAE 4140 Hot Rolled Round Bars    

SAE 4140 Cold Rolled and Cold Drawn Round bars

SAE 4140 Peeled Round Bars    

SAE 4140 Ground Round Bars    

SAE 4140 Polished Round Bars    

SAE 4140 Turned Round Bars    

SAE 4140 Forged Bars    

SAE 4140 Proof Machine Bars    


16mm dia to 250mm dia
3mm dia to 100mm dia
3mm dia to 65mm dia
3mm dia to 65mm dia
3mm dia to 65mm dia
10mm dia to 1200mm dia
30mm dia to 1500mm dia
30mm dia to 1500mm dia

Square Bars Size

Product Name 

SAE 4140 Hot Rolled Square Bars    
SAE 4140 Cold Drawn Square Bars

SAE 4140 Peeled Square Bars   
SAE 4140 Ground Square Bars    
SAE 4140 Polished Square Bars    
SAE 4140 Forged Square Bars    
SAE 4140 Proof Machine Bars   


10mm Square to 200mm Square
10mm Square to 80mm Square
5mm Square to 80mm Square
5mm Square to 80mm Square
5mm Square to 50mm Square
30mm Square to 1500mm Square
30mm Square to 1500mm Square


SAE 4140 specifies hardness as an important attribute of high-end machine parts. The shipbuilding industry, mechanical engineers, and petroleum engineers commonly use SAE 4140. A high alloy content provides SAE 4140 with high tensile strength. When processing SAE 4140 at high temperatures, it can be safely processed. In addition, SAE 4140 can be used to manufacture components such as screws, machine arms, pistons, shafts, and axles. Continuously worn and torn products usually comply with SAE 4140.

SAE 4140 Round Bar Uses
SAE 4140 Round Bar Uses
SAE 4140 Round Bar Uses
SAE 4140 Round Bar Uses
SAE 4140 Round Bar Uses
SAE 4140 Round Bar Uses

We also Provide

  • SAE 4140 high tensile Bright bars | High Yield Strength Bars | Hi-Yield Bars| High Tensile strength Bars | Good Quality​

  • SAE 4140 Supplier and exporter

  • AISI 4140 Hot Rolled Round bars

  • SAE 4140 Lowest Price in India

  • AISI 4140 alloy steel Bright bars

  • Special Steel SAE 4140 Supplier

  • Buy SAE 4140 material near me

  • alloy steel SAE 4140 round bar

  • SAE 4140 Forged steel Round bar

  • SAE 4140 Round bar Dealers

  • Cold Drawn SAE 4140 Round bar

  • Stockiest of SAE 4140 Round bar

  • Dealers of SAE 4140 Steel Round rods, Flat bars, Rectangular bars, Hex bars, Pipes, Sheets

  • Mild Steel SAE 4140

  • alloy steel SAE 4140 hex bar

  • Mild Steel SAE 4140 Rods

  • alloy steel SAE 4140 ingot

  • SAE 4140 steel rods

  • SAE 4140 rectangle bars

  • SAE 4140 alloy steel bright bar

  • alloy steel SAE 4140 forged bar supplier

  • SAE 4140 alloy steel square bars

  • SAE 4140 alloy steel rods price list

  • alloy steel SAE 4140 round bar specification

  • SAE 4140 alloy flat bars price

  • alloy steel SAE 4140 cold finish round bar

  • SAE 4140 sheets supplier

  • SAE 4140 plate dealers

  • AISI 4140 alloy steel polish bar exporter in Mumbai India

  • SAE 4140 alloy steel rods mechanical properties

  • SAE 4140 alloy steel round bars

  • SAE 4140 Manufacturers

  • alloy steel SAE 4140 hexagon price list

  • AISI 4140 biggest supplier in India

  • SAE 4140 alloy steel rods

  • ​SAE 4140 alloy steel rods stockiest in Mumbai

  • SAE 4140 Alloy square bar

  • alloy steel SAE 4140 billet

  • alloy steel SAE 4140 round bar

  • SAE 4140 Mechanical properties

  • SAE 4140 plate dealers in Mumbai, India

  • SAE 4140 alloy black bar chemical composition

  • SAE 4140 alloy steel rectangular bars

  • SAE 4140 alloy black supplier in India

  • alloy steel SAE 4140 square bars

  • alloy steel SAE 4140 forging

  • SAE 4140 alloy steel bars

  • SAE 4140 Sheet metal providers.

  • SAE 4140 alloy steel hexagonal bar exporter in India

  • alloy steel SAE 4140 round bar

  • alloy steel SAE 4140 cold drawn round bar

  • AISI 4140 material dealers

  • SAE 4140 alloy steel polished bar supplier in Mumbai India

  • SAE 4140 alloy steel round bars price list

  • SAE 4140 alloy steel threaded bar exporter

  • Buy SAE 4140 Round bar

  • SAE 4140 alloy steel Suppliers

  • alloy steel SAE 4140 bright bar manufacturers in India

  • alloy steel SAE 4140 rectangular bars manufacturers in India

  • SAE 4140 alloy steel flat bar weight chart

  • AISI 4140 material supplier in Mumbai

  • SAE 4140 alloy steel bar exporter

  • SAE 4140 Round bar supplier


SAE 4140
 Suppliers of 4140 Alloy Steel 

High hardness ranges and high tensile strength are among the material properties of SAE 4140, which allow for stress to be generated by normal operation. A strong, durable steel, SAE 4140 is the perfect choice for industrial applications. SAE 4140 steel is characterized by a high hardness.  National Steel Industries provides bars of all shapes and sizes, including round and forged bars and bright bars. There are a variety of sizes available in our inventory for AISI 4140. We are a manufacturer and exporter of SAE 4140 grade steel bars, and we have established ourselves as one of the most trusted brands in the market. We offer bright and hot rolled AISI 4140 round bars.

The heat treatment of SAE 4140 includes normalizing, tempering and quenching. A wide range of machine parts are made using this process, including chains, screws, gears, rollers, and arms. As a result, 4140 is widely used in the shipbuilding, aerospace, mechanical engineering, oil, and iron and steel industries, among others. 

The National Steel Industries is one of the largest manufacturers of SAE 4140 steel. AISI 4140 round bars and AISI 4140 sheets are provided with materials testing certificates that ensure complete quality assurance. 

SAE 4140 Round Bar Supplier manufacturer exporter and stockist national steel industries mumbai india

National Steel Industries is one of the biggest suppliers, exporters and Stockists of SAE 4140 material at the best price. 

At Your service in

We are the leading supplier of SAE 4140 round bar supplier in  Mumbai,  Delhi,  Bangalore, Hyderabad, Ahmedabad, Chennai, Kolkata, Surat, Pune, Jaipur, Lucknow, Kanpur, Najpur, Indore, Thane, Bhopal, Visakhapatnam, Pimpri, Chinchwad, Patna, Vadodara, Ghaziabad, Ludhiana, Agra, Nashik, Ranchi, Faridabad, Meerut, Rajkot, Kalyan, Dombivli, Vasai, Virar, Varanasi, Aurangabad, Dhanbad, Amritsar, Navi Mumbai, Allahabad, Howrah, Gwalior, Jabalpur, Coimbatore, Vijayawada, Jodhpur, Madurai, Raipur, Kota, Chandigarh, Guwahati, Solapur, Hubli, Dharwad, Mysore, Tiruchirappalli, Gurgaon, Bhubaneswar, Salem, Warangal, Mira, Bhayandar, Jalgaon, Guntur, Thiruvananthapuram, Bhiwandi, Saharanpur, Amravati, Noida, Jamshedpur, Bhilai, Cuttack, Firozabad, Kochi, NelloreBhavnagar, Dehradun, Durgapur, Asansol, Rourkela, Nanded, Kolhapur, Ajmer, Akola, Gulbarga, Jamnagar, Ujjain, Loni, Siliguri, Jhansi, Ulhasnagar, Sangli, Miraj, Kupwad, Mangalore, Kurnooi, Ambattur, Rajahmundry, Tirunelveli, Malegaon, Gaya, Udaipur, Kakinada, Muzaffarnagar, Bhatpara, Panihati, Latur, Dhule, Rohtak, Sagar, Korba, Bhilwara, Berhampur, Muzaffarpur, Ahmednagar, Kollam, Avadi, Kadapa, Anantapuram, Kamarhati, Bilaspur, Sambalpur, Shahjahanpur, Satara, Bijapur, Rampur, Shimoga, Chandrapur, Junagadh, Thrissur, Alwar, Bardhaman, Kulti, Nizamabad, Parbhani, Tumkur, Khammam, Uzhavarkarai, Bihar, Panipat, Darbhanga, Bally, Aizawl, Dewas, Ichalkaranji, Karnal, Bathinda, Jalna, Eluru, Barasat, Kirari, SulemanNagar, Purnia, Satna, Mau, Sonipat, Farrukhabad, Durg, Imphal, Ratlam, Hapur, Arrah, Anantapur, Karimnagar, Etawah, Ambarnath, Bharatpur, Begusarai, NewDelhi, Gandhidham, Baranagar, Tiruvottiyur, Pondicherry, Katni, Secunderabad, Naihati, Yamunanagar, Bidhannagar, Pallavaram, Bidar, Munger, Panchkula, Burhanpur, RaurkelaIndustrialTownship, Kharagpur, Dindigul, Gandhinagar, Hospet, NangloiJat, Malda, Ongole, Deoghar, Chapra, Haldia, Khandwa, Nandyal, Morena, Amroha, Anand, Bhind, Bhalswa, Jahangir, Pur, Madhy, amgram, Bhiwani, Berhampore, Ambala, Morbi, Fatehpur, Raebareli, , Khora, , Ghaziabad, Chittoor, Bhusawal, Orai, Vellore, Mehsana, Raiganj, Sirsa, Danapur, Serampore, Sultan, Pur, Majra, Guna, Jaunpur, Panvel, Shivpuri, Surendranagar, Dudhrej, Unnao, Chinsurah, Alappuzha, Kottayam, Machilipatnam, Shimla, Adoni, Udupi, Katihar, Proddatur, Mahbubnagar, Saharsa, Dibrugarh, Jorhat, Hazaribagh, Hindupur, Nagaon, Sasaram, Hajipur.

We  can supply SAE 4140 round bar supplier in the following countries

  • USA

  • Turkey

  • Saudi Arabia

  • Qatar

  • UAE

  • Kenya

  • Singapore

  • South Korea

  • Austria

  • Belgium

  • Czechia

  • Denmark

  • Estonia

  • Finland

  • France

  • Germany

  • Greece

  • Hungary

  • Iceland

  • Italy

  • Chile

  • Latvia

  • Switzerland

  • Ukraine

  • United Kingdom

  • Canada

  • Bahrain

  • Israel

  • Thailand

  • Iraq

  • Niger

  • Libya

  • Algeria

  • Honduras

  • Armenia

  • Azerbaijan

  • Belarus

  • Georgia

  • Iceland

  • Liechtenstein

  • Moldova

  • Norway

  • San Marino

  • Guatemala 

  • Russia

  • Liechtenstein

  • Lithuania

  • Netherlands

  • Norway

  • Poland

  • Portugal

  • Slovakia

  • Brazil

  • Slovenia

  • Spain

  • Sweden

  • Switzerland

  • Andorra

  • Laos

  • Cambodia

  • Myanmar

  • Vietnam

  • Argentina

  • Uruguay

  • Paraguay

  • Mexico

Products of SAE 4140


FAQ of SAE 4140

Q) How to weld SAE 4140?
Ans: AISI 4140 or SAE 4140 should not be welded directly. It must be welded under annealed or normalized conditions. This is so that the metal can make a good bond with the material during the welding process.

Q) What Type of Steel is AISI 4140?
Ans: AISI 4140 comes under alloy steel of standard grades of steel. AISI 4140 equivalent grades are SAE 4140 and UNS G41400. The SAE 4140 steel is used by a variety of industries such as the automobile industry, aircraft industry, etc.

National Steel Industries provides the best price and best quality for SAE 4140 round bars.

bottom of page