SAE 4140 Alloy Steel Round Bar
SAE 4140 is a medium-carbon chromium-molybdenum alloy steel used for industrial components where an appropriate combination of strength, toughness, hardness and wear resistance is required. Chromium and molybdenum contribute to the hardenability and mechanical characteristics of the alloy steel.
SAE 4140 Round Bar is suitable for many demanding engineering applications because it can be processed and heat treated to obtain different mechanical conditions. The selected condition should always be based on the component design, machining requirements and service conditions.
Common supply conditions include annealed, normalized, hardened and tempered, and quenched and tempered. Different surface finishes such as bright, black, forged and turned bright can also be supplied according to product requirements and availability.
Super Metal Manufacturing Co. supplies SAE 4140 Round Bars for OEMs, engineering companies, machinery manufacturers, fabricators, distributors, stockists and industrial buyers. Standard and customized requirements can be discussed according to the required specification.
Material Specification Chart
| Specifications | ASTM A182, ASME SA182 |
|---|---|
| Standards | EN, DIN, JIS, ASTM, BS, ASME, AISI |
| Range of Diameter | 5mm to 500mm |
| Finish | Bright, Black, Forged, Turned Bright |
| Length | 1000 mm Long To 6000 mm Long |
| Form | Round, Billet, Ingot, Forging Etc. |
SAE 4140 / AISI 4140 / EN19 / 42CrMo4 Round Bars Grade
| Country names | Poland | USA | German | British | Japan | China | Australia | |
|---|---|---|---|---|---|---|---|---|
| Country standards | UNS | AISI | ASTM A29 | DIN 17200 | BS 970 | JIS G4105 | GB/T 3077 | AS 1444 |
| Grades | G41400 | 4140 | 4140 | 1.7225/ 42CrMo4 | EN 19 / 42CrMo4 | SCM440 | 42CrMo | 4140 |
What is SAE 4140 Round Bar?
SAE 4140 Round Bar is a chromium-molybdenum alloy steel bar manufactured or supplied with a circular cross-section. SAE 4140 is widely used in mechanical and structural component manufacturing because of its combination of strength, toughness and hardenability.
The round-bar shape is particularly useful for machining operations such as turning, drilling, milling and threading. This makes SAE 4140 suitable for manufacturing shafts, gears, axles, pins, studs, crankshafts and other components.
Depending on the required application, SAE 4140 can be supplied in different heat-treatment conditions and surface finishes. The final material condition should be selected according to the required mechanical properties and component design.
SAE 4140 Round Bar Chemical Characteristics
SAE 4140 belongs to the chromium-molybdenum family of alloy steels. Its alloying elements are selected to provide useful hardenability and mechanical performance. Carbon contributes to strength and hardness, while chromium and molybdenum support hardenability and performance after appropriate heat treatment.
The exact chemical composition should be verified against the applicable material specification and the Mill Test Certificate supplied with the order. Composition requirements can vary according to the applicable standard and product specification.
SAE 4140 Round Bar Manufacturing Process
The production and processing of SAE 4140 Round Bar involves controlled stages to achieve the required dimensions, material condition and surface quality. The exact process depends on the required size, manufacturing route, standard and final application.
Raw Material Selection
Suitable alloy steel raw material is selected according to the specified SAE 4140 grade and applicable purchasing requirements. Material identity and quality requirements are considered before processing.
Heating
The steel is heated under controlled conditions before hot working. Controlled heating helps support consistent forming and material quality.
Forging or Rolling
Depending on the required product and dimensions, the heated material can be processed through forging or rolling to obtain the required round-bar form.
Heat Treatment
SAE 4140 can undergo heat-treatment processes according to the required mechanical properties. Common conditions include annealed, normalized, hardened and tempered, and quenched and tempered.
Surface Processing
The material can be supplied with different surface conditions such as bright, black, forged or turned bright depending on the product specification.
Straightening and Cutting
Where required, bars can be straightened and cut to specified lengths. This can help manufacturers prepare material for subsequent machining and fabrication operations.
Inspection
Finished products can be checked for applicable dimensions, surface condition and documentation requirements. Material Test Certificates and other applicable quality documents can be supplied according to the order.
Advantages of SAE 4140 Round Bar
SAE 4140 Round Bar is widely used because it provides a versatile balance of mechanical properties and can be processed through different heat treatment methods.
- High Strength: Suitable heat treatment can provide high strength for demanding mechanical components.
- Good Toughness: The alloy can provide a useful combination of strength and toughness when processed appropriately.
- Good Hardenability: Chromium and molybdenum contribute to the hardenability of the alloy.
- Wear Resistance: Appropriately heat-treated material can provide useful resistance to mechanical wear.
- Machining Versatility: Suitable material conditions can be machined into various engineering components.
- Heat-Treatment Flexibility: The material can be supplied in different conditions according to the required application.
- Wide Industrial Use: SAE 4140 is used in automotive, machinery, construction, mining, agriculture and general engineering.
- Multiple Product Sizes: Different diameters and lengths can be supplied subject to availability.
SAE 4140 Round Bar Applications
SAE 4140 Round Bar is used for industrial and engineering components that require suitable strength, toughness and wear resistance. Applications range from automotive and machinery components to construction equipment and general engineering parts.
Automotive Industry
SAE 4140 can be used for shafts, axles, gears, crankshafts, pins and other mechanical automotive components where appropriate alloy steel properties are required.
Machinery Manufacturing
Machinery manufacturers use SAE 4140 Round Bar for shafts, gears, drive components, rollers, pins and other parts subjected to mechanical loads.
Construction Equipment
The material may be used for selected shafts, pins, axles and mechanical components used in construction and heavy equipment.
Mining Equipment
Mining equipment can experience heavy mechanical loading and repeated stress. SAE 4140 may be used for appropriate shafts, pins, gears and other engineered components.
Oil & Gas Equipment
SAE 4140 alloy steel is used for selected mechanical components in oil and gas equipment. The exact material specification should be selected according to the service conditions and applicable engineering standard.
Agricultural Equipment
SAE 4140 Round Bar can be used for shafts, axles, gears, pins and other components in agricultural machinery.
General Engineering
The material is widely used for machined parts, shafts, fixtures, pins, studs and other engineering components requiring suitable mechanical properties.
SAE 4140 Round Bar Heat Treatment
Heat treatment allows SAE 4140 alloy steel to be supplied in different mechanical conditions. The selected treatment depends on the required hardness, strength, toughness, machining characteristics and application.
Annealing
Annealing can be used to obtain a softer material condition that is generally more suitable for machining and subsequent processing.
Normalizing
Normalizing can be used to develop a suitable material structure and mechanical condition for selected engineering applications.
Quenching and Tempering
Quenching followed by tempering can be used to develop higher strength and hardness while maintaining an appropriate level of toughness. The actual heat-treatment parameters should follow the applicable specification and engineering requirement.
SAE 4140 Round Bar Surface Finishes
Depending on the customer's requirements and product availability, SAE 4140 Round Bars can be supplied in different surface finishes.
- Bright Finish: Suitable where improved surface and dimensional control is required.
- Black Finish: Commonly associated with hot-worked alloy steel products.
- Forged Finish: Suitable for forged alloy steel requirements.
- Turned Bright Finish: A machined surface condition offering improved dimensional and surface control.
SAE 4140 Round Bar in Custom Sizes
Industrial customers may require specific dimensions based on their machining and component manufacturing requirements. Super Metal Manufacturing Co. supports SAE 4140 requirements based on diameter, length, quantity, finish and material condition.
Customers can provide drawings, technical specifications or dimensional requirements for review. Cut-to-length requirements can also be discussed depending on the product, quantity and processing requirements.
Our SAE 4140 Round Bar supply is suitable for OEMs, manufacturers, engineering companies, fabricators, distributors, stockists and industrial buyers.
SAE 4140 Round Bar Quality Testing
Quality documentation is important for alloy steel used in engineered components. Super Metal Manufacturing Co. supports applicable inspection and material documentation according to customer requirements.
A Mill Test Certificate (MTC) can be supplied where required. Additional inspection and third-party inspection can be coordinated according to the purchase specification.
Available Quality Documents
- Mill Test Certificate
- Quality Certificate
- Inspection Reports
- Third-Party Inspection Reports on Request
- Material Traceability Documentation as Applicable
SAE 4140 Round Bar Manufacturer, Stockist & Exporter
Super Metal Manufacturing Co. supplies SAE 4140 Round Bar for domestic and international industrial requirements. Our supply service supports customers requiring standard sizes, customized lengths, different surface finishes and specified material conditions.
For export orders, suitable industrial packing can be arranged according to the product and destination. Common packing methods include steel bundles, wooden crates, skids and waterproof protective wrapping.
Export documentation may include Commercial Invoice, Packing List, Bill of Lading or AWB, Mill Test Certificate and Certificate of Origin where applicable.
Why Choose Super Metal Manufacturing Co. for SAE 4140 Round Bar?
- Established Since 1965: Long-standing experience in metal products and industrial supply.
- SAE 4140 Product Supply: Support for SAE 4140 alloy steel Round Bar requirements.
- Multiple Dimensions: Different diameters and lengths subject to availability.
- Customized Requirements: Support for specified lengths, finishes and material conditions.
- Quality Documentation: MTC and applicable inspection documents according to order requirements.
- Export Support: Industrial packing, documentation and shipment coordination.
- Wide Application Range: Suitable for automotive, machinery, construction, mining, agriculture, oil & gas and general engineering applications.
Alloy Steel 4140 Round Bars Dimensions Standard
|
Diameter or Width (mm) |
Weight per meter | Sectional Area | Perimeter |
|
Round (kg) |
Round (cm²) |
Round (cm) |
|
| 5.0 | 0.15 | 0.20 | 1.57 |
| 5.5 | 0.19 | 0.24 | 1.78 |
| 6.0 | 0.22 | 0.28 | 1.88 |
| 7.0 | 0.30 | 0.38 | 2.20 |
| 8.0 | 0.39 | 0.50 | 2.51 |
| 9.0 | 0.50 | 0.64 | 2.83 |
| 10 | 0.63 | 0.79 | 3.14 |
| 11 | 0.75 | 0.95 | 3.46 |
| 12 | 0.89 | 1.13 | 3.77 |
| 14 | 1.21 | 1.54 | 4.40 |
| 16 | 1.58 | 2.01 | 5.03 |
| 18 | 2.00 | 2.54 | 5.65 |
| 20 | 2.47 | 3.14 | 6.28 |
| 22 | 2.98 | 3.80 | 6.91 |
| 25 | 3.85 | 4.91 | 7.85 |
| 28 | 4.83 | 6.16 | 8.80 |
| 32 | 6.31 | 8.04 | 10.05 |
| 36 | 7.99 | 10.18 | 11.31 |
| 40 | 9.86 | 12.57 | 12.57 |
| 45 | 12.49 | 15.90 | 14.14 |
| 50 | 15.41 | 19.64 | 15.71 |
| 56 | 19.34 | 24.63 | 17.59 |
| 63 | 24.47 | 31.17 | 19.79 |
| 71 | 31.08 | 39.59 | 22.31 |
| 80 | 39.46 | 50.27 | 25.13 |
Certifications & Quality Assurance
Quality assurance and material traceability are important when sourcing SAE 4140 alloy steel. Applicable material certificates and inspection documentation can be supplied according to customer requirements. Third-party inspection can be arranged when requested.
- Mill Test Certificate
- Quality Management / ISO Certificate
- Third-Party Inspection Reports Available on Request
Export Packing & Shipping
SAE 4140 Round Bars can be packed according to the product, destination and transportation requirements. Typical packing methods include steel bundles, wooden crates, skids and waterproof protective wrapping.
For international shipments, packing and documentation requirements can be discussed before dispatch. Fumigated wooden packing can be arranged where required for export shipments.
MOQ, Lead Time & Payment
Minimum Order Quantity (MOQ): MOQ depends on grade, size, quantity, stock availability and customized requirements. Contact our sales team for the applicable requirement.
Lead Time: Delivery time depends on stock, quantity, cutting, inspection, packing and manufacturing requirements. The confirmed lead time can be provided with the quotation.
Payment Terms: Payment terms can be discussed according to order quantity, destination and commercial requirements.
Typical Applications
SAE 4140 Round Bars are commonly used for shafts, gears, axles, crankshafts, pins, studs, fasteners, hydraulic components, rollers and other mechanical parts. The material is used across automotive, engineering, construction, agriculture, mining, oil & gas and industrial machinery.
Export Destinations
Super Metal Manufacturing Co. supports SAE 4140 Round Bar enquiries from customers in India and international markets including the Middle East, Europe, North America, Southeast Asia, Africa and other global destinations.
Frequently Asked Questions About SAE 4140 Round Bar
What is SAE 4140 Round Bar?
SAE 4140 Round Bar is a chromium-molybdenum alloy steel product supplied in a circular cross-section. It is commonly used for shafts, gears, axles, pins, crankshafts and other mechanical components requiring suitable strength, toughness and wear resistance.
What is SAE 4140 steel used for?
SAE 4140 steel is commonly used for shafts, gears, axles, crankshafts, pins, studs, fasteners, hydraulic components, rollers and other engineered parts used in automotive, machinery, construction, mining, agriculture and general engineering applications.
Is SAE 4140 the same as AISI 4140?
SAE 4140 and AISI 4140 are commonly used designations for the same 4140 alloy steel grade family. The exact material requirements should always be verified against the applicable specification, standard and purchase documentation.
What is the UNS designation for SAE 4140?
The commonly associated UNS designation for 4140 alloy steel is UNS G41400. The applicable material standard should be confirmed for the specific product and application.
What sizes are available in SAE 4140 Round Bar?
SAE 4140 Round Bar can be supplied in different diameters and lengths subject to stock and production availability. The listed diameter range includes 5 mm to 500 mm, with lengths from 1000 mm to 6000 mm according to the product requirement.
Can SAE 4140 Round Bar be heat treated?
Yes. SAE 4140 can be supplied in different heat-treatment conditions, including annealed, normalized, hardened and tempered, and quenched and tempered. The selected condition depends on the required mechanical properties and application.
What surface finishes are available for SAE 4140 Round Bar?
Depending on product availability and specification, SAE 4140 Round Bar can be supplied with bright, black, forged or turned bright surface finishes.
How can I buy SAE 4140 Round Bar from India?
Send your required diameter, length, quantity, surface finish, heat-treatment condition, applicable standard and delivery destination to Super Metal Manufacturing Co. by email or WhatsApp. Our team can check availability and provide quotation information.