Our 4140 Hollow Bars are supplied with strict attention to dimensional accuracy, surface finish and material quality. Depending on customer requirements, the material can be supplied in annealed, normalized, hardened and tempered or quenched and tempered conditions.
We provide customized sizes, cut-to-length services and machining-ready hollow bars to support customer-specific engineering requirements. Our technical team can assist customers in selecting suitable dimensions and material conditions for their applications.
With a strong focus on quality and customer satisfaction, Super Metal Manufacturing Co. supplies 4140 Hollow Bars for both domestic and international requirements. Export orders can be arranged according to product specifications, quantity, packing and delivery requirements.
What are 4140 Hollow Bars?
4140 Hollow Bars are hollow alloy steel bars manufactured from AISI 4140 chromium-molybdenum steel. They contain an internal bore and are used where high strength, toughness and material efficiency are required.
4140 alloy steel is identified as UNS G41400 and is commonly associated with 42CrMo4, 1.7225, EN19 and SCM440 depending on the applicable standard. The exact equivalent should always be confirmed against the required material specification.
The chromium and molybdenum alloying elements improve the hardenability and mechanical performance of the steel. 4140 Hollow Bars can be heat treated to achieve the required hardness, strength and toughness for demanding engineering applications.
4140 Hollow Bars Manufacturer and Supplier
Super Metal Manufacturing Co. supplies 4140 Hollow Bars for industrial and engineering applications. Our products are suitable for manufacturers, fabricators, OEMs, machinery companies and distributors requiring high-strength alloy steel hollow sections.
4140 Hollow Bars can be supplied in different dimensions and material conditions. Customers can provide their required outside diameter, inside diameter, wall thickness, length and quantity to receive suitable availability and quotation information.
We also support customized cut lengths and inspection requirements according to customer drawings and purchase specifications. Material certificates and quality documentation can be supplied as required.
Advantages of 4140 Hollow Bars
4140 Hollow Bars offer a combination of high-strength alloy steel properties and hollow geometry. This makes them suitable for components where strength, toughness, weight and machining requirements need to be considered together.
- High tensile strength
- Good yield strength
- Excellent hardenability
- Good toughness
- Good wear resistance
- Suitable for heat treatment
- Good resistance to mechanical stress
- Suitable for heavy-duty engineering applications
- Suitable for machining applications
- Material-efficient hollow construction
- Available in customized dimensions
- Suitable for domestic and export requirements
4140 Hollow Bars Standards and Equivalent Grades
| 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 |
4140 Hollow Bars Chemical Composition
4140 alloy steel contains carbon, silicon, manganese, chromium and molybdenum. These elements contribute to its strength, toughness, hardenability and wear resistance.
| Element | Composition |
|---|---|
| Carbon (C) | 0.38 – 0.43% |
| Silicon (Si) | 0.15 – 0.35% |
| Manganese (Mn) | 0.75 – 1.00% |
| Chromium (Cr) | 0.80 – 1.10% |
| Molybdenum (Mo) | 0.15 – 0.25% |
| Phosphorus (P) | 0.035% Max |
| Sulfur (S) | 0.040% Max |
4140 Hollow Bars Mechanical Properties
The mechanical properties of 4140 Hollow Bars depend on the section size and material condition. Heat treatment can be used to obtain the required combination of tensile strength, yield strength, hardness and toughness.
| Property | Typical Condition |
|---|---|
| Tensile Strength | Depending on heat-treatment condition |
| Yield Strength | Depending on section size and condition |
| Elongation | Depending on material condition |
| Hardness | Depending on heat treatment |
| Impact Toughness | Depending on material condition |
4140 Hollow Bars Manufacturing Process
The manufacturing process of 4140 Hollow Bars begins with alloy steel raw material having the required chemical composition. Controlled heating and forming operations are used to produce the required hollow section.
Depending on the required dimensions and manufacturing route, suitable hot working, piercing, forging, machining or other controlled processes may be used. The outside diameter, inside diameter and wall thickness are controlled to achieve the specified product dimensions.
After forming, the bars may undergo annealing, normalizing, hardening and tempering or quenching and tempering according to the required mechanical properties.
Final operations can include straightening, cutting, machining and surface finishing. Quality checks may include chemical analysis, dimensional inspection, hardness testing, mechanical testing and surface inspection.
4140 Hollow Bars Applications
4140 Hollow Bars are used in demanding engineering applications where high strength and toughness are required. The hollow construction can be beneficial in suitable component designs where weight and material efficiency are important considerations.
- Automotive Industry: Shafts, axles, sleeves and other high-strength components.
- Hydraulic Equipment: Hydraulic components, sleeves and selected cylinder components.
- Industrial Machinery: Machine components, shafts, couplings and mechanical parts.
- Oil & Gas: Selected high-strength equipment and machinery components.
- Construction Equipment: Components exposed to heavy mechanical loads.
- Mining Equipment: Selected heavy-duty machinery components.
- Power Transmission: Shafts, sleeves and selected transmission components.
- General Engineering: Machined and fabricated engineering components.
- Manufacturing: High-strength components requiring alloy steel material.
4140 Hollow Bars Heat Treatment
4140 alloy steel is suitable for different heat-treatment processes depending on the required final properties. Common conditions include annealed, normalized, hardened and tempered and quenched and tempered.
Heat treatment can improve strength and hardness while maintaining suitable toughness. The appropriate treatment should be selected according to the applicable material standard and intended application.
Alloy Steel 4140 Hollow Bars Dimensions Standard
| Outside Diameter | Inside Diameter | Wall Thickness | Length |
|---|---|---|---|
| As per requirement | As per requirement | As per requirement | 1000 mm to 6000 mm |
| Custom OD | Custom ID | Custom Thickness | Cut-to-Length Available |
4140 Hollow Bars can be supplied in different outside diameters, inside diameters, wall thicknesses and lengths according to stock availability and customer requirements. Customized dimensions and cut-to-length services can be discussed for specific applications.
Certifications & Quality Assurance
We maintain robust quality processes and can provide the following documents with shipments:
- Mill Test Certificate
- Quality Management: ISO certificate
- Third-party inspection reports (TPI) available on request
- Chemical Composition Report
- Mechanical Test Report
- Dimensional Inspection Report
Export Packing & Shipping
Typical export packing: steel bundles, wooden crates or skids, waterproof wrapping and fumigated wood where required. We ship from the nearest major port and can handle CIF/FOB/EXW terms depending on buyer preference.
MOQ, Lead Time & Payment
Minimum Order Quantity (MOQ): Contact us for exact MOQ per size/grade.
Lead Time: In-stock items: 1–3 weeks, subject to inspection and documentation. Mill direct and custom production: 3–8 weeks depending on order size.
Payment Terms: Contact us to choose payment terms.
HS Code & Export Documentation
HS classification can vary according to the exact product form and destination-country customs requirements. Documents supplied can include Commercial Invoice, Packing List, Bill of Lading / AWB, Mill Test Certificate and Certificate of Origin (COO), where required.
Typical Applications
4140 Hollow Bars are commonly used for shafts, sleeves, axles, hydraulic components, machine parts, automotive components, construction equipment, mining machinery, oil and gas equipment and other high-strength engineering applications.
Export Destinations (Selected)
We supply 4140 Hollow Bars to international markets across Europe, the Middle East, Africa, Asia and North America. Export requirements can be arranged according to destination country, product dimensions, quantity, inspection requirements and delivery terms.
Frequently Asked Questions
What are 4140 Hollow Bars?
4140 Hollow Bars are high-strength chromium-molybdenum alloy steel hollow bars used for engineering, automotive, hydraulic, machinery, construction, oil and gas and industrial applications.
What is the equivalent grade of 4140 Hollow Bars?
AISI 4140 is identified as UNS G41400 and is commonly compared with 42CrMo4, 1.7225, EN19 and SCM440 depending on the applicable material standard.
Can 4140 Hollow Bars be heat treated?
Yes. 4140 Hollow Bars can be supplied in suitable heat-treated conditions including annealed, normalized, hardened and tempered and quenched and tempered conditions.
What are 4140 Hollow Bars used for?
They are commonly used for shafts, sleeves, axles, hydraulic components, automotive parts, industrial machinery, construction equipment, mining machinery and other high-strength engineering components.
Can you supply customized 4140 Hollow Bar sizes?
Yes. Customized outside diameter, inside diameter, wall thickness and cut-to-length requirements can be discussed according to customer drawings and technical specifications.
How can I request a price quotation?
You can share your grade, outside diameter, inside diameter, wall thickness, quantity and delivery location via WhatsApp, email or our Request a Quote form.
What details do you need to provide a quotation?
Please provide the required grade, dimensions, quantity, preferred standards, heat-treatment condition and delivery location.
What payment terms do you offer?
We accept bank transfer (TT), LC and advance payment depending on order size, buyer requirements and agreed commercial terms.
How long does delivery take?
Stock items can generally be dispatched within the agreed lead time after order confirmation, while custom manufacturing may require additional time depending on specifications, quantity, heat treatment and inspection.
Can I get a sample before ordering?
Yes, sample requirements can be discussed with our sales team depending on product dimensions, quantity and application.
How do you pack 4140 Hollow Bars for export?
We use suitable export packing such as steel bundles, wooden boxes or pallets, waterproof HDPE wrapping and proper product identification for safe transportation.
Do you offer bulk order discounts?
Yes, we offer competitive pricing for bulk quantities, repeat buyers and long-term supply contracts.