AISI 4140 Hex Bars Manufacturer, Stockist and Exporter
AISI 4140 Hex Bars are high-strength alloy steel bars widely used in heavy-duty applications. Known for their excellent toughness, fatigue resistance, and wear resistance, these bars are ideal for critical components. They are often used in automotive, aerospace, and industrial machinery industries. The steel undergoes heat treatment to achieve desired mechanical properties. AISI 4140 Hex Bars are available in various sizes and dimensions to suit multiple engineering requirements. These bars provide superior performance in both tensile and impact loading conditions. Additionally, they are suitable for machining, forging, and welding processes.
AISI 4140 Hex Bars consist of carbon, chromium, molybdenum, and manganese. Carbon content provides hardness and strength, while chromium enhances corrosion resistance. Molybdenum improves high-temperature strength and toughness. Manganese contributes to overall hardenability and wear resistance. Small amounts of sulfur and phosphorus are present for machinability and structural integrity. The precise chemical composition ensures consistent mechanical properties throughout the bar. This alloy composition makes 4140 a versatile and reliable choice for engineering applications.
AISI 4140 Hex Bars exhibit high tensile strength, excellent yield strength, and impressive elongation. Typical tensile strength ranges from 95–105 ksi, while yield strength is around 60–70 ksi. Hardness varies depending on heat treatment, often between 197–241 HB in normalized condition. The alloy maintains good impact toughness even at low temperatures. Fatigue resistance allows long-term usage in dynamic applications. These mechanical properties make the bars suitable for shafts, gears, and heavy-duty fasteners. They combine strength and flexibility for demanding environments.
Worldwide AISI 4140 Hex Bars Manufacturer, Stockist and Exporter
Heat treatment enhances the strength and hardness of AISI 4140 Hex Bars. Quenching and tempering processes optimize mechanical properties without compromising toughness. Normalizing improves grain structure and machining characteristics. Stress-relieving reduces residual stress and prevents warping during machining. Controlled heat treatment ensures consistent hardness throughout the bar’s cross-section. The bars can also be hardened locally for high-wear applications. Heat-treated 4140 bars are ideal for parts subjected to high stress or cyclic loading.
These hex bars are widely used in engineering, automotive, and oilfield industries. Common applications include shafts, pins, bolts, gears, and couplings. They are also suitable for heavy-duty machinery components. The alloy’s high fatigue resistance makes it ideal for rotating parts. In aerospace, 4140 bars are used for structural and landing gear components. The bars are also preferred for forging operations due to uniform properties. Their versatility allows usage in both standard and custom-designed parts.
AISI 4140 Hex Bars meet ASTM A29, ASTM A108, and SAE J404 standards. They are available in hot-rolled, cold-drawn, or forged forms. Dimensional tolerances comply with ISO and DIN specifications. Surface finishes can be customized as per application requirements. The bars are offered in diameters ranging from small to extra-large sizes. Lengths are typically customized to reduce waste and ease handling. Each bar undergoes quality testing for hardness, tensile strength, and chemical composition.
These hex bars offer superior strength-to-weight ratio, excellent wear resistance, and high toughness. They provide consistent mechanical performance under extreme conditions. Easy machinability and heat treatability make them cost-effective. The alloy’s fatigue resistance ensures long service life in dynamic applications. Versatility allows usage across multiple industries with varying requirements. Enhanced dimensional stability ensures reliable and accurate components. Overall, AISI 4140 Hex Bars are a dependable choice for high-performance applications.
AISI 4140 Hex Bars
Specifications
| Specification | Description |
|---|---|
| Material | AISI 4140 Alloy Steel |
| Standard | ASTM A29 / ASTM A108 / SAE J404 |
| Form | Hot Rolled / Cold Drawn / Forged |
| Size Range | Hex Flats: 10 mm to 150 mm (custom sizes available) |
| Length | 3 m, 6 m or customized lengths |
| Surface Finish | Hot Rolled, Pickled, Oil Coated, or Polished |
| Tolerances | As per ASTM / ISO / DIN standards |
Chemical Composition (Typical Ranges)
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.38 – 0.43 |
| Manganese (Mn) | 0.75 – 1.00 |
| Chromium (Cr) | 0.80 – 1.10 |
| Molybdenum (Mo) | 0.15 – 0.25 |
| Silicon (Si) | 0.15 – 0.35 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (UTS) | 95 – 105 ksi (655 – 725 MPa) |
| Yield Strength (YS) | 60 – 70 ksi (415 – 485 MPa) |
| Elongation (in 2 inches) | 20 – 25% |
| Reduction of Area | 45 – 55% |
| Hardness (HB) | 197 – 241 (Normalized) |
| Impact Toughness | Good, even at low temperatures |
| Fatigue Resistance | High, suitable for dynamic loads |
Dimension Chart
| Hex Size (Across Flats) | Width (mm) | Width (inch) | Typical Length (m) |
|---|---|---|---|
| 10 mm | 10 | 0.3937 | 3 – 6 |
| 20 mm | 20 | 0.7874 | 3 – 6 |
| 30 mm | 30 | 1.1811 | 3 – 6 |
| 40 mm | 40 | 1.5748 | 3 – 6 |
| 50 mm | 50 | 1.9685 | 3 – 6 |
| 60 mm | 60 | 2.3622 | 3 – 6 |
| 80 mm | 80 | 3.1496 | 3 – 6 |
| 100 mm | 100 | 3.9370 | 3 – 6 |
Equivalent 4140s
| Standard | Equivalent Grade |
|---|---|
| ASTM | AISI 4140 |
| SAE | 4140 |
| DIN | 42CrMo4 |
| EN | 1.7225 |
| JIS | SCr440 |
| GB (China) | 42CrMo |
| BS (UK) | 4140 |
We offer a wide range of AISI 4140 Hex Bars in various diameters, lengths, and finishes. Our bars are supplied with hot-rolled, cold-drawn, and centerless ground finishes, ensuring superior surface quality and dimensional accuracy. Custom cutting, polishing, and packaging services are also available to meet specific project requirements.
With a strong inventory, reliable distribution network, and dedicated customer support, Shakti Forge India continues to strengthen its position as a leading AISI 4140 Hex Bars manufacturer, stockist, and exporter. Our products serve both domestic industrial hubs and global industries, delivering high-performance AISI bars that meet stringent engineering and quality standards.
Frequently Asked Questions (FAQs)
Cities we have supplied our products to
Mumbai, Delhi, Bengaluru(Bangalore), Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Rajkot, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, Amritsar, Chandigarh, Mysuru (Mysore), Udaipur, Jodhpur, Visakhapatnam, Coimbatore, Madurai, Kochi, Thiruvananthapuram, Mangalore, Nashik, Kolhapur, Chandrapur, Akola, Vilayat, Somnath, Dahej, Narmada, Ankleshwar, Navsari, Valsad, Rajpipla, Veraval,Kovvur, Andra Pradesh,Karwar, Karnataka,Kosamba, Gujarat, Vishakapatnam, Shahad, Pondicherry, Kakkinada, Pradesh, Nagda, Madhya Pradesh,Harihar, Karnataka, Tuticorin, Tamilnadu, Trivandrum, KeralaKurnool, Rourkela, Hindupur, Orissa, Renukoot, Uttar Morbi, Kerala ,Himachal, Dehradun, Visakhapatnam ,Jamnagar, Kozhikode, Ludhiana,Latur, Nanded, Vijaywada, Alwar, Bareilly, Bikaner, Andheri, Marol, Taloja, Turbhe, TTC (Thane-Belapur), Pimpri-Chinchwad, Chakan, Talegaon, Ranjangaon, Jejuri, Baramati, Satpur, Ambad, Sinnar, Igatpuri, Shendra, Waluj, Chikalthana, Paithan, Hingna, Butibori, Kalmeshwar, Umred, Shiroli, Kagal, Gokul Shirgaon, Akkalkot, Chincholi, Lote-Parshuram, Dombivli, Ambernath, Mahad, Roha, Palghar, Tarapur (Boisar)
Cities we have supplied our products to
South Korea, Africa, Sri Lanka, Syria, Taiwan, Tanzania, Tajikistan, Thailand, Turkey, Turkmenistan, Ukraine, United Kingdom, Arab Emirates (UAE), Uzbekistan, Vietnam, Yemen, France, Germany, Greece, Oman, Colombia, Portugal, Japan, Lithuania, Macau, Mongolia, Qatar, Ireland, Malaysia, Bangladesh, Russia, Iran, Jordan, Singapore, Bulgaria, Poland, Denmark, Nigeria, Gambia, Indonesia, Finland, Argentina, Chile, Spain, Peru, Kuwait, India, Saudi Arabia, Slovakia, Slovenia, Sweden, Switzerland, Bahrain, the Netherlands, United Kingdom, Mexico, Bulgaria, Spain, France, Germany, Colombia, Brazil, Saudi Arabia, Iraq, Iran, Sudan, Libya, Tanzania, Nigeria, New Zealand, Paris, Switzerland
Applications of AISI 4140 Hex Bars
- Oil & Gas Industry – pipelines, offshore rigs, valves, and fittings
- Chemical Processing Plants – heat exchangers, reactors, and storage vessels
- Marine & Shipbuilding – propeller shafts, seawater systems, and pumps
- Aerospace – jet engines, turbine blades, and structural components
- Power Generation – nuclear plants, boilers, and steam generators
- Automotive – exhaust systems, sensors, and performance parts
- Pharmaceutical & Food Industry – equipment requiring hygiene and corrosion resistance
- Construction & Infrastructure – high-strength fasteners, joints, and supports