Carbon Steel Round Bar Supplier | Custom Length & Stocks

CJM Steel supplies carbon steel round bars for machining, fabrication, shafts, pins, fasteners, machinery components and general industrial applications.

Our carbon steel round stock is available in different grades, diameters, lengths and delivery conditions, with cut-to-length processing and material certification available according to project requirements.

Product Highlights

• Carbon steel round bar in multiple grades
• Different diameters and lengths
• Hot rolled and cold finished options
• Cut-to-length service
• MTC / inspection documents
• Export packing and delivery

Carbon Steel Round Bar Specifications

Item	Specification
Product	Carbon Steel Round Bar
Material	Carbon Steel
Shape	Round
Grades	1018, 1025, 1045/C45, A36, A105, EN8 and other grades according to requirements
Diameter	Various diameters according to grade and supply condition
Length	Standard lengths and cut-to-length
Manufacturing	Hot Rolled / Cold Drawn / Forged, depending on grade
Surface	Black / Bright / Polished, depending on supply condition
Standards	ASTM / AISI / SAE / EN / DIN / JIS, depending on grade
Delivery Condition	As Rolled / Normalized / Annealed / Q&T, depending on grade
Certification	MTC / EN 10204 3.1, according to order requirements

Actual dimensions, manufacturing methods, surface conditions and delivery conditions depend on the selected grade and product specification.

Carbon Steel Round Bar Grades

CJM Steel supplies a range of carbon steel and related engineering round bar grades for machining, fabrication, structural and industrial applications.

To better understand section properties, chemical compositions, and how to choose the right material for your project, you can review our steel round bar grades, types, standards and selection guide.

Grade	Type	Typical Applications	Product Page
AISI 1018	Low Carbon Steel	Machining, shafts, pins, general components	AISI/SAE 1018 Round Steel Bar
AISI 1025	Carbon Steel	Machinery parts, bolts, nuts and general components	AISI/SAE 1025 Round Steel Bar
AISI/SAE 1045 / C45	Medium Carbon Steel	Shafts, gears, axles and machinery components	AISI/SAE 1045 C45 Round Steel Bar
A36	Carbon Structural Steel	Fabrication, structural components and machinery	A36 Round Steel Bar
A105	Carbon Steel Forging Grade	Flanges, fittings, pressure and industrial components	A105 Round Steel Bar
EN8	Medium Carbon Steel	Shafts, pins and machined components	EN8/EN9 En Series Round Steel Bar
A572 / S355JR	High-Strength / Low-Alloy Structural Steel	Construction, machinery and structural components	A572/S355JR Round Steel Bar

Note: The table above highlights our most commonly requested carbon steel round bar grades.

Additional structural, alloy, and specialized grades are available; please explore our carbon steel bar category or contact our team to confirm specific order requirements, dimensions, and applicable standards.

Carbon Steel Round Bar Sizes

Carbon steel round bars are available in different diameters and lengths depending on the selected grade, manufacturing process and delivery condition.

Typical supply requirements can include:

Diameter Range	Available Length	Supply Form
10–20 mm	Standard / Cut to Length	Hot Rolled / Cold Finished
21–50 mm	Standard / Cut to Length	Hot Rolled / Cold Finished
51–100 mm	Standard / Cut to Length	Hot Rolled
100 mm+	On Request	Hot Rolled / Forged

Actual availability depends on grade and production requirements.

For standard dimensions, metric and inch sizes, and theoretical weight calculations, see our guide to Steel Round Bar Sizes, Dimensions and Weight.

Carbon Steel Round Bar Supply Forms and Finishes

Different supply forms can be selected according to machining requirements, dimensional accuracy and final application.

Supply Form	Typical Characteristics
Hot Rolled	General-purpose round bar for fabrication and machining
Cold Drawn	Improved dimensional accuracy and surface finish
Peeled	Improved surface condition and dimensional consistency, where available
Ground	Higher surface precision for machining applications, where available
Cut to Length	Supplied according to required component length

The available supply form and surface finish depend on the selected grade, diameter and production requirements.

Carbon Steel Round Bar Applications

Machining Components

Carbon steel round stock is commonly used for shafts, pins, bushings, axles and other machined components.

Machinery Manufacturing

Round bar stock can be supplied for machine parts, rollers, connecting components and other engineering applications.

Fabrication

Suitable carbon steel grades can be used for fabricated components where machinability, weldability and general mechanical performance are required.

Fasteners and Forged Components

Selected grades can be supplied for fasteners, forgings, flanges and other formed components according to the applicable material specification.

General Industrial Use

Carbon steel round bars are also used for maintenance parts, replacement components and general industrial manufacturing.

Carbon Steel Round Bar Quality and Certification

CJM Steel supports inspection and documentation requirements for international orders.

Quality control and documentation can include:

• Chemical composition verification
• Mechanical property testing
• Dimensional inspection
• Surface inspection
• Heat number traceability
• Mill Test Certificate
• EN 10204 3.1 MTC
• Third-party inspection, if required

Inspection and certification requirements can be arranged according to the applicable material standard and project requirements.

Why Choose CJM Steel as Your Carbon Steel Round Bar Supplier?

Multiple Grade Options

We supply different carbon steel grades for general engineering, machining, fabrication and industrial applications.

Flexible Dimensions

Different diameters and lengths are available according to the selected product and project requirements.

Cut-to-Length Service

Round bars can be supplied in required cutting lengths where applicable, helping reduce additional processing at the customer’s facility.

Material Certification

MTC and relevant inspection documents can be provided according to the applicable specification and order requirements.

Export Supply

CJM Steel supports international orders with export packing, documentation and shipment coordination.

How to Order Carbon Steel Round Bar

1. Specify the Grade

Provide the required grade, such as AISI 1018, AISI 1045, C45, A36 or another specified material.

2. Confirm Diameter and Length

Specify the required diameter × length, including any cut-to-length requirements.

3. Confirm Quantity and Delivery Requirements

Provide the required quantity, destination and preferred delivery schedule.

4. Request a Quote

CJM Steel can confirm material availability, specifications, pricing, lead time and documentation according to your requirements.

Send Your Requirements:

Grade × Diameter × Length × Quantity × Destination

Frequently Asked Questions

What is carbon steel round bar?

Carbon steel round bar is a solid cylindrical steel product used for machining, fabrication, shafts, pins, fasteners and other industrial components.

What grades are available in carbon steel round bar?

Common options include AISI 1018, 1025, 1045/C45, A36, A105 and EN8, with additional grades available according to the required specification.

What is the difference between hot rolled and cold drawn round bar?

Hot rolled round bar is commonly used for general fabrication and machining, while cold drawn round bar provides improved dimensional accuracy and surface finish.

Can carbon steel round bar be cut to length?

Yes. Cut-to-length service can be arranged according to the required diameter, length and order quantity.

How do I buy carbon steel round bar?

Provide the required grade, diameter, length, quantity and destination. The supplier can then confirm availability, price, lead time and certification requirements.

Conclusion

CJM Steel supplies carbon steel round bar for machining, fabrication, machinery manufacturing and other industrial applications. With multiple grade options, flexible dimensions, cut-to-length service and material certification, we support international buyers with practical carbon steel bar stock solutions.

Request a Quote for Carbon Steel Round Bar

Q: What is your company’s main products/services?

A: We are a professional manufacturer for Carbon Steel, Alloy Steel and Profile products. We have the experience of steel business for more than 10 years and our products are exported to Mid East,South America,Southeast Asia,Africa,South and East Asia etc.

Q: Can I go to your factory for a visit?

A: Of course, we welcome customers from all over the world to visit our factory.

Q: What are your terms of payment?

A: 30% T/T deposite and 70% balance before shipment.

Q: What is your delivery time?

A: For stocks,we could transport the goods to loading port within 7 days after we received the deposit; For production,it usually takes about 15-30 days after receiving the deposit.

Q: Do you provide samples? Are they free or paid?

A: Samples are available for free,but the courier freight will be covered by customer account.

Q: Do you accept the third party inspection?

A:Yes, we fully accept ‌third-party inspections.

Q: Why should I buy from you not from other suppliers?

A: Integrating the superior resources of China’s steel industry, we provide customers with high-quality steel products at preferential prices, and can ensure that the goods are delivered to customers in a timely manner.

Q:How can you guarantee quality?

A: Always a pre-production sample before mass production;Always 100% inspected before shipment