Round Steel Bar
Circular solid section. Specify nominal diameter, steel grade and finish.
Explore Round Steel Bar ↗
Global Steel Supply & Processing
Hot-rolled and cold-finished carbon steel bars in round, square, flat and hexagonal sections. Specify your grade, cross section, length and order quantity for factory supply.
From machining stock to structural and fabricated components, send your bar schedule and destination port for a quotation based on the exact sizes and delivery condition you need.
Browse reference sizes and weights ↓Compare solid bar cross sections, then select the grade, hot-rolled or cold-finished condition and tolerance standard for your application.
Circular solid section. Specify nominal diameter, steel grade and finish.
Explore Round Steel Bar ↗Solid four-sided stock for fabrication, machining and industrial components.
Explore Square Steel Bar ↗Rectangular strip section identified by width × thickness.
Explore Flat Steel Bar ↗Six-sided bar ordered by width across flats for machined parts.
Explore Hexagonal Steel Bar ↗Choose a cold-finished supply condition when your drawing calls for tighter dimensional control, improved surface finish or specified straightness. The actual tolerance and mechanical properties depend on the selected bar specification.
Use your material schedule to confirm the exact product condition, section dimension standard and inspection requirements.
| Product | Solid carbon steel bars — round, square, flat and hexagonal |
| Manufacturing Route | Hot-rolled / cold-finished; other delivery conditions on quotation |
| Common Grade Requests | SAE 1018, SAE 1020, SAE 1045, GB 20, GB 45, Q235B, S235JR — verify grade designation and applicable material standard |
| Bar Section | Round diameter; square side; flat width × thickness; hex across flats |
| Dimensions | Specify nominal cross section, section tolerances and cut length |
| Surface | As-rolled, cold-finished, peeled or polished where technically and commercially applicable |
| Quality Documents | Chemical composition, mechanical properties, heat number and MTC scope per purchase order |
| Typical Supply Format | Straight bars in bundled lengths; delivery form and packing confirmed by quotation |
| Order Details | Steel grade, applicable standard, size, length, tonnage, tolerance, destination and delivery terms |
Grade chemistry and mechanical requirements come from the material specification; section size and allowable deviation follow the chosen dimensional standard.
General requirements for hot-wrought carbon and alloy steel bars; use with the applicable grade and product specification.
Hot-wrought special-quality carbon steel bars, with requirements defined by the specified grade.
Cold-finished carbon and alloy steel bars intended for machining, heat treatment or as-finished applications.
Quality carbon structure steel material designation for grades such as 20 and 45.
Steel bar dimensions and tolerances; specify the governing edition on the order.
Dimensions and tolerances for flat, square, round and hexagonal hot-rolled bars respectively.
Common steel requests may include SAE/AISI 1018, 1020 and 1045; GB grades 20 and 45; or specified structural grades. Different naming systems and their delivery requirements must be reviewed separately. For GB/T 702, confirm the effective edition for the order date.
Choose a reference solid bar size below to fill the calculator. These are geometric weight estimates, independent of live inventory.
Cross section in mm · theoretical mass in kg/m
| Bar Type | Section (mm) | Theoretical kg/m | Use Size |
|---|---|---|---|
| Round Ø20 | Ø20 | 2.466 | |
| Round Ø30 | Ø30 | 5.549 | |
| Round Ø50 | Ø50 | 15.413 | |
| Square 20×20 | 20 × 20 | 3.140 | |
| Square 30×30 | 30 × 30 | 7.065 | |
| Square 40×40 | 40 × 40 | 12.560 | |
| Flat 40×6 | 40 × 6 | 1.884 | |
| Flat 50×8 | 50 × 8 | 3.140 | |
| Flat 75×10 | 75 × 10 | 5.887 | |
| Hex AF17 | AF 17 | 1.965 | |
| Hex AF24 | AF 24 | 3.916 | |
| Hex AF30 | AF 30 | 6.118 |
Calculated at nominal steel density of 7,850 kg/m³ with ideal solid geometry. Rolled edge radii, section tolerances and actual material density can change delivered mass. Confirm invoicing weights and shipment totals with the order.
Select round, square, flat or hexagonal bar stock. Enter the dimensions, bar length and quantity to estimate your purchasing tonnage.
Nominal density 7,850 kg/m³. Geometry only: apply the supplied dimensions and accepted weighing method for your purchase order.
An accurate factory quote begins with a dimensioned bar schedule. If your order contains several shapes or grades, you can submit them together.
Round: π × diameter² ÷ 4
Square: side²
Flat: width × thickness
Hex: √3 × across-flats² ÷ 2
Cross-section area (mm²) × 0.00785 = theoretical kg/m.
Your drawing and manufacturing process determine which bar section, chemical grade, surface condition and dimensional tolerance to purchase.
Round and hexagonal bar stock for turning, drilling and further machining based on grade and delivery condition.
Square and flat steel bars for fabricated assemblies, supports and attachment details.
Bar feedstock for cut, formed and machined industrial components where suitable grades are specified.
Solid bar elements for approved support details and steelwork connections.
Mixed bar shapes and length schedules for regular distributor purchasing.
Carbon steel bars selected for intended heat treatment, surface condition and machining process.
For repeat orders and project purchases, our company-wide production capacity, combined steel inventory and quality coordination support your sourcing process.
Company-wide output supports planning for ongoing and project-based steel orders.
Manufacturing ↗Combined stock across all steel products supports purchasing coordination; exact carbon bar availability is checked by size and grade.
Inventory ↗Align test certificates, dimensions, identification and inspection scope with the material schedule.
Quality Control ↗Coordinate bar lengths, quantities, bundling and shipment terms with one RFQ.
Bar shape and tolerance determine the practical supply route. Specify the final section, material condition and machining allowance in your request, so production and finishing can be reviewed against the drawing.
Give us your grade, section sizes and lengths to check stock against the required material condition. Mixed-size orders can be coordinated into one shipment schedule.
Buy carbon steel bars against a defined acceptance basis. Your purchase order determines the material standard, dimensions, test records and any additional inspection requirements.
Share your drawing and machining allowances with the material request. Available operations are assessed for the grade, quantity and bar dimensions.
Confirm your required bar lengths, bundle size, protective requirements and port of destination. Our quotation will establish the packing and delivery arrangement for the final order.
Review shape-specific and material-specific options before sending a combined quotation request.
Common solid shapes include round, square, flat and hexagonal bars. Confirm the grade, section dimensions, available delivery condition and lengths for your order.
Choose the delivery condition from your drawing and manufacturing process. Cold-finished bars are often specified where surface finish or dimensional tolerance is important. Actual requirements depend on the chosen grade and product specification.
Provide the precise designation and governing standard required by your drawing. Their chemical, test and delivery requirements must be checked against the order before substituting one designation for another.
Calculate the nominal solid cross-sectional area in mm², multiply it by 0.00785 to obtain kg/m, then multiply by the bar length and number of pieces. Nominal geometry is a planning estimate.
Provide the shape, grade, standard edition, nominal dimensions, tolerances, length, quantity or total tonnage, delivery condition, certificate requirements and destination port.
Include the required length and length tolerance in the request. Cutting and other finishing options can be confirmed with the quotation based on the grade and ordered quantity.
Send your required grade, dimensions, quantity and destination. Our team will review the inquiry.