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12mm Steel Rebar – High-Strength Deformed Steel Bars for Concrete Reinforcement
12mm Reinforcing Steel Bar | HRB400 / HRB500 / B500B | Bulk Supply & Export
Xi'an Dongmeng Group Co., Ltd. supplies 12mm steel rebar for reinforced concrete construction, infrastructure development and industrial building projects. Our product sourcing solutions cover hot-rolled deformed steel bars in specified strength grades, standard lengths and project-oriented supply configurations.
With a nominal diameter of 12mm and a theoretical unit weight of approximately 0.888 kg/m, this reinforcing bar size is widely specified for concrete slabs, beams, foundation elements, walls and other engineered structural members.
Buyers can request HRB400, HRB400E, HRB500, HRB500E and selected international reinforcement grades, subject to mill availability, standard compliance and project requirements.
What Is 12mm Steel Rebar?
12mm steel rebar is a nominal 12-millimeter reinforcing steel bar designed for use within concrete structures. Unlike plain round steel bars, deformed rebar incorporates transverse ribs and, depending on the design, longitudinal ribs that improve mechanical interlock with the surrounding concrete.
Its primary function is to provide tensile reinforcement where plain concrete alone is insufficient. The required reinforcement grade, bar spacing, anchorage length, concrete cover and positioning must be determined by the structural designer.
The 12mm designation refers to the nominal equivalent diameter and cross-sectional area, not necessarily the diameter measured across the rib crests.
Key Product Advantages
Specified Strength Grades
Multiple strength and ductility classes can be evaluated according to construction specifications and regional acceptance requirements.
Ribbed Surface for Concrete Bond
Deformed bar geometry supports load transfer between steel and concrete when detailing, placement and anchorage are correctly engineered.
Practical Reinforcement Size
The 12mm diameter can be used for a variety of reinforcement arrangements, including selected slab reinforcement, beams, retaining walls and foundation components.
Project-Oriented Supply
Standard commercial lengths, cutting arrangements, bundle identification and documentation can be coordinated for approved export orders.
Quality and Traceability
Chemical composition, tensile properties, bending performance and dimensional conformity can be verified against the agreed product standard and relevant mill documents.
12mm Steel Rebar Specifications
| Property | Specification |
| Product | 12mm Steel Rebar / Deformed Steel Bar |
| Nominal Diameter | 12 mm (metric) |
| Nominal Cross-Sectional Area | Approximately 113.1 mm² |
| Theoretical Unit Weight | Approximately 0.888 kg/m |
| Grade Options | HRB400, HRB400E, HRB500, HRB500E, B500B, B500C |
| Manufacturing | Hot-rolled ribbed steel bar |
| Bar Length | 6 m, 9 m, 12 m or agreed cut length |
| Surface | As-rolled (black); protective coating on request |
| Delivery Form | Straight bars in bundles |
| Inspection | Chemical, mechanical, dimension and marking checks |
| Documentation | Mill test certificates and agreed inspection records |
| Applications | Reinforced concrete construction and civil engineering |
12mm Rebar Standards and Steel Grades
For international infrastructure projects, selecting the correct product standard is as important as selecting the nominal bar diameter.
Steel reinforcement standards define mechanical performance, chemical limits, dimensional tolerances, rib geometry, test procedures and product identification. Requirements differ between countries and cannot be assumed equivalent solely because yield-strength values appear similar.
| Standard | Example Grade | Nominal Yield Strength | Buyer Consideration |
| GB 1499.2-2024 | HRB400 / HRB400E | 400 MPa class | Chinese hot-rolled ribbed rebar |
| GB 1499.2-2024 | HRB500 / HRB500E | 500 MPa class | Higher-strength grade; E seismic properties |
| BS 4449:2005+A3:2016 | B500B / B500C | 500 MPa characteristic | Different ductility classes |
| ASTM A615/A615M-25 | Grade 60 [420] | 420 MPa minimum | US #4 nominal diameter 12.7 mm |
| ASTM A706/A706M-25 | Grade 60 [420] | 420 MPa minimum | Controlled composition and mechanical requirements |
| ISO 6935-2:2019 | Project-specified grade | Depends on grade | Confirm designation and applicable clauses |
HRB400 and HRB400E Rebar
HRB400 is a commonly specified hot-rolled ribbed reinforcement strength grade under the Chinese standard system. HRB400E includes additional mechanical performance requirements intended for specified seismic applications.
Project engineers must verify the actual material properties and seismic design requirements before approving use.
HRB500 and HRB500E Rebar
HRB500 reinforcement belongs to a higher nominal yield-strength class than HRB400. HRB500E also incorporates seismic-related requirements.
Selection of a higher strength class does not automatically reduce total steel consumption. Structural detailing, minimum reinforcement limits, serviceability and code provisions remain decisive.
BS 4449 B500B and B500C Rebar
B500B and B500C reinforcing steel are associated with different ductility requirements under BS 4449. Both are based on a nominal 500 MPa characteristic yield-strength class.
The selection between them should follow the approved structural design, specified ductility requirements and relevant material acceptance documentation.
ASTM A615 and ASTM A706 Rebar
ASTM A615 covers carbon-steel reinforcing bars, whereas ASTM A706 specifies low-alloy reinforcing bars with controlled mechanical and chemical characteristics, including requirements relevant to weldability.
Important for US buyers: Standard US #4 rebar has a nominal diameter of 12.7mm (½ inch), not 12.0mm. Therefore, customers requesting ASTM #4 bars should be quoted against the specified US bar designation rather than automatically supplied with metric 12mm bars.
GB Standard – Hot-Rolled Ribbed Steel Rebar Size Chart
Applicable Grades: HRB400, HRB400E, HRB500, HRB500E and other grades covered by the applicable standard.
GB 1499.2 Metric Rebar Dimensions
| Diameter (mm) | Area (mm²) | Weight (kg/m) | 6m (kg) | 9m (kg) | 12m (kg) |
| 6 | 28.27 | 0.222 | 1.33 | 2 | 2.66 |
| 8 | 50.27 | 0.395 | 2.37 | 3.56 | 4.74 |
| 10 | 78.54 | 0.617 | 3.7 | 5.55 | 7.4 |
| 12 | 113.1 | 0.888 | 5.33 | 7.99 | 10.66 |
| 14 | 153.9 | 1.21 | 7.26 | 10.89 | 14.52 |
| 16 | 201.1 | 1.58 | 9.48 | 14.22 | 18.96 |
| 18 | 254.5 | 2 | 12 | 18 | 24 |
| 20 | 314.2 | 2.47 | 14.82 | 22.23 | 29.64 |
| 22 | 380.1 | 2.98 | 17.88 | 26.82 | 35.76 |
| 25 | 490.9 | 3.85 | 23.1 | 34.65 | 46.2 |
| 28 | 615.8 | 4.83 | 28.98 | 43.47 | 57.96 |
| 32 | 804.2 | 6.31 | 37.86 | 56.79 | 75.72 |
| 36 | 1018 | 7.99 | 47.94 | 71.91 | 95.88 |
| 40 | 1257 | 9.87 | 59.22 | 88.83 | 118.44 |
| 50 | 1964 | 15.42 | 92.52 | 138.78 | 185.04 |
ASTM Standard – US Reinforcing Bar Sizes and Weights
| US Bar Size | Metric Designation | Nominal Diameter (mm) | Nominal Area (mm²) | Mass (kg/m) | Weight (lb/ft) |
| #3 | #10 | 9.5 | 71 | 0.56 | 0.376 |
| #4 | #13 | 12.7 | 129 | 0.994 | 0.668 |
| #5 | #16 | 15.9 | 199 | 1.552 | 1.043 |
| #6 | #19 | 19.1 | 284 | 2.235 | 1.502 |
| #7 | #22 | 22.2 | 387 | 3.042 | 2.044 |
| #8 | #25 | 25.4 | 510 | 3.973 | 2.67 |
| #9 | #29 | 28.7 | 645 | 5.06 | 3.4 |
| #10 | #32 | 32.3 | 819 | 6.404 | 4.303 |
| #11 | #36 | 35.8 | 1006 | 7.907 | 5.313 |
| #14 | #43 | 43 | 1452 | 11.38 | 7.65 |
| #18 | #57 | 57.3 | 2581 | 20.24 | 13.6 |
British Standard – B500A / B500B / B500C Rebar Size Chart
| Nominal Diameter (mm) | Nominal Area (mm²) | Nominal Mass (kg/m) |
| 6 | 28.3 | 0.222 |
| 7 | 38.5 | 0.302 |
| 8 | 50.3 | 0.395 |
| 9 | 63.6 | 0.499 |
| 10 | 78.5 | 0.617 |
| 12 | 113 | 0.888 |
| 16 | 201 | 1.58 |
| 20 | 314 | 2.47 |
| 25 | 491 | 3.85 |
| 32 | 804 | 6.31 |
| 40 | 1257 | 9.86 |
| 50 | 1963 | 15.4 |
TMT Steel Rebar Size and Weight Chart
| Nominal Size (mm) | Nominal Area (mm²) | Mass (kg/m) |
| 4 | 12.6 | 0.099 |
| 5 | 19.6 | 0.154 |
| 6 | 28.3 | 0.222 |
| 8 | 50.3 | 0.395 |
| 10 | 78.6 | 0.617 |
| 12 | 113.1 | 0.888 |
| 16 | 201.2 | 1.58 |
| 20 | 314.3 | 2.47 |
| 25 | 491.1 | 3.85 |
| 28 | 615.8 | 4.83 |
| 32 | 804.6 | 6.31 |
| 36 | 1018.3 | 7.99 |
| 40 | 1257.2 | 9.86 |
| 45 | 1591.1 | 12.49 |
| 50 | 1964.4 | 15.42 |
Japanese Standard – Deformed Reinforcing Bar Dimensions and Weights
| Designation | Nominal Diameter (mm) | Area (mm²) | Unit Mass (kg/m) |
| D4 | 4.23 | 14.05 | 0.11 |
| D5 | 5.29 | 21.98 | 0.173 |
| D6 | 6.35 | 31.67 | 0.249 |
| D8 | 7.94 | 49.51 | 0.389 |
| D10 | 9.53 | 71.33 | 0.56 |
| D13 | 12.7 | 126.7 | 0.995 |
| D16 | 15.9 | 198.6 | 1.56 |
| D19 | 19.1 | 286.5 | 2.25 |
| D22 | 22.2 | 387.1 | 3.04 |
| D25 | 25.4 | 506.7 | 3.98 |
| D29 | 28.6 | 642.4 | 5.04 |
| D32 | 31.8 | 794.2 | 6.23 |
| D35 | 34.9 | 956.6 | 7.51 |
| D38 | 38.1 | 1140 | 8.95 |
| D41 | 41.3 | 1340 | 10.5 |
| D51 | 50.8 | 2027 | 15.9 |
Australian Reinforcing Steel Bar Size Chart – 500N
| Nominal Diameter (mm) | Cross-Sectional Area (mm²) | Mass (kg/m) |
| 10 | 78.5 | 0.617 |
| 12 | 113 | 0.888 |
| 16 | 201 | 1.58 |
| 20 | 314 | 2.47 |
| 24 | 452 | 3.55 |
| 28 | 616 | 4.83 |
| 32 | 804 | 6.31 |
| 36 | 1020 | 7.99 |
| 40 | 1260 | 9.86 |
| 50 | 1960 | 15.4 |
International 12mm-Class Rebar Comparison
| Standard | Bar Designation | Nominal Diameter (mm) | Nominal Area (mm²) | Unit Weight (kg/m) |
| GB 1499.2 | 12mm | 12 | 113.1 | 0.888 |
| BS 4449 | 12mm | 12 | 113 | 0.888 |
| IS 1786 | 12mm | 12 | 113.1 | 0.888 |
| ASTM A615/A706 | #4 / #13 | 12.7 | 129* | 0.994 |
| JIS G 3112 | D13 | 12.7 | 126.7 | 0.995 |
| AS/NZS 4671 (AU) | 12mm | 12 | 113 | 0.888 |
| AS/NZS 4671 (NZ) | 12mm | 12 | 113 | 0.888 |
12mm Steel Rebar Weight Per Meter and Per Piece
The theoretical weight of 12mm steel rebar is approximately 0.888 kilograms per meter.
For procurement planning, buyers can use nominal weight to calculate the approximate quantity of reinforcing bars required for a project. Actual delivered weight, quantity tolerances and invoicing basis must follow the purchase agreement and applicable product standard.
| Nominal Diameter | Length | Weight per Bar | Approx. Bars per Metric Tonne |
| 12 mm | 6 m | 5.33 kg | 188 |
| 12 mm | 9 m | 7.99 kg | 125 |
| 12 mm | 12 m | 10.66 kg | 94 |
12mm Metric Rebar vs. US #4 Rebar
Metric 12mm steel rebar has approximately 113.1mm² nominal cross-sectional area and 0.888 kg/m theoretical weight. US #4 rebar has approximately 127mm² nominal cross-sectional area and 0.994 kg/m theoretical weight.
The difference affects material weight, quantity and structural reinforcement area. The two sizes must not be substituted without design approval.
Surface and Corrosion Protection Options
Black / As-Rolled Steel Rebar
Hot-rolled reinforcing steel supplied without an additional protective coating. This is a conventional option for many reinforced concrete projects where the specified concrete cover and durability design provide the required protection.
Epoxy-Coated Steel Rebar
An epoxy coating can provide additional corrosion protection in selected exposure environments. Coating specifications may reference ASTM A775/A775M for epoxy-coated bars or ASTM A934/A934M for reinforcement fabricated before epoxy coating.
The coating sequence, bending operations, coating integrity and repair procedures must be specified and verified.
Hot-Dip Galvanized Steel Rebar
Hot-dip galvanized reinforcement uses a zinc coating for additional corrosion protection. ASTM A767/A767M addresses zinc-coated steel bars for concrete reinforcement. Coating mass, dimensional compatibility and fabrication requirements must be agreed before production.
| Surface Option | Typical Purpose | Procurement Requirement |
| Black / As-Rolled | Conventional concrete reinforcement | Confirm base steel standard |
| Epoxy-Coated | Specified enhanced corrosion protection | ASTM A775/A934 route as applicable; coating tests |
| Hot-Dip Galvanized | Zinc-coated concrete reinforcement | ASTM A767/A767M or project requirement |
Applications of 12mm Steel Rebar
12mm reinforcing bars are used in a range of concrete reinforcement systems. Actual suitability depends on the design loads, bar arrangement, structural code and specified reinforcement grade.
Concrete Floor Slabs
Used in engineered slab reinforcement arrangements to help resist tensile stresses and control cracking. Bar spacing, cover and layout must follow the approved structural drawings.
Foundations and Footings
Specified reinforcing bars are used within reinforced concrete footings, foundation beams and related elements to distribute structural loads according to engineering requirements.
Beams and Columns
12mm bars may be specified as longitudinal or transverse reinforcement in selected structural members where load capacity, confinement and reinforcement detailing permit.
Retaining Walls and Shear Walls
Reinforcing steel supports the structural performance of reinforced concrete wall systems. The diameter and arrangement must satisfy bending, shear, crack-control and anchorage requirements.
Precast Concrete Components
Straight or approved fabricated reinforcement may be incorporated into precast concrete products, including selected panels, structural elements and other engineered components.
Bridges and Civil Infrastructure
Reinforcing bars may be used in bridge decks, drainage structures, road infrastructure and other reinforced concrete systems when the specified grade and dimensions comply with project requirements.
Cutting, Fabrication and Export Packaging
Standard-Length Reinforcing Bars
Commonly requested metric bar lengths include 6m, 9m and 12m. Other cut lengths may be reviewed according to project drawings, processing capacity and shipping requirements.
Cut-to-Length Processing
Project-specific cutting can be arranged against approved cutting schedules, subject to mill or processing-center capability. Buyers should specify required bar length, permissible tolerance and bundle identification.
Reinforcement Bending and Fabrication
Bending and fabricated reinforcement arrangements may be evaluated separately. Minimum bend diameters, bending temperatures, grade suitability and permitted rebending must comply with the relevant design and product specifications.
Export Bundling and Identification
Steel rebars are generally bundled for lifting, handling and transportation. Export bundles can be specified with identification tags showing the product grade, nominal diameter, length, heat or batch information and other agreed traceability details.
Loading plans must account for bar length, bundle weight, transport regulations and destination-port handling capabilities. In particular, 12m straight bars require a suitable logistics arrangement and must not be assumed to fit in a conventional 20-foot container.
Quality Inspection and Material Traceability
At Dongmeng Group, material verification is an important part of coordinating steel reinforcement supply for international customers.
Inspection requirements are reviewed against the specified product standard, mill documents and project acceptance criteria. Where required, third-party inspection can be discussed before shipment.
| Inspection Item | Verification Method | Purpose |
| Chemical Composition | Mill heat analysis / applicable verification testing | Steel grade and chemical conformity |
| Tensile Properties | Yield, tensile and elongation tests | Mechanical performance |
| Bend / Rebend | Specified standard test procedures | Bending performance where applicable |
| Mass and Dimensions | Nominal mass, bar measurements and tolerance checks | Dimensional conformity |
| Rib Geometry | Rib pattern and relevant dimensional measurements | Product standard conformity |
| Heat Traceability | Mill markings, bundle tags and test records | Batch identification |
| Coating Verification | Coating thickness, integrity and other specified tests | Coated-product compliance |
| Third-Party Inspection | Agreed independent inspection scope | Buyer acceptance verification |
Mill Test Certificates and Inspection Documents
Depending on the agreed material standard and supply arrangement, documentation may include mill test certificates, chemical analysis results, mechanical test results, dimensional inspection records and heat-number identification.
EN 10204 Type 3.1 inspection documents or independent inspection reports can be requested where supported by the mill and expressly included in the order.
Important: Certificate availability, certification type and inspection scope must be confirmed before purchase. A material test certificate should not be presented as an independent product certification unless the applicable certification has actually been obtained.
Why Choose Dongmeng Group as Your 12mm Steel Rebar Supplier?
Industrial Material Sourcing Experience
Xi'an Dongmeng Group Co., Ltd. supports overseas buyers with carbon steel, reinforcing steel and other industrial metal products. We focus on matching material specifications with procurement and construction-project requirements.
Standard-Based Material Selection
We help customers clarify reinforcing bar grades, nominal sizes, technical standards, surface configurations and required inspection documentation before order confirmation.
Processing and Project Supply Coordination
Cutting requirements, delivery lengths, bundle configurations and inspection arrangements can be evaluated according to the project schedule and confirmed processing capabilities.
International Trade and Logistics Support
We can coordinate export quotations and shipping proposals under agreed Incoterms, subject to transport routes, product availability and destination requirements.
Traceability and Documentation
We emphasize grade identification, relevant test documentation and shipment records to help importers and engineering contractors carry out their acceptance procedures.
12mm Steel Rebar Price Per Ton – Request a Quotation
The price of 12mm steel rebar is influenced by the selected grade, applicable standard, order quantity, surface treatment, production availability, delivery length and international freight conditions.
A quotation for HRB400 12mm rebar may differ from one for B500B, HRB500E or coated reinforcement. Likewise, 6m and 12m bars may require different loading and freight arrangements.
For a more accurate quotation, please provide the required steel grade, standard, diameter, bar length, total quantity, destination port, inspection requirements and preferred trade terms.
Dongmeng Group can prepare a supply proposal after confirming material availability, manufacturing or processing scope and commercial requirements.
Frequently Asked Questions About 12mm Steel Rebar
Q1. What is the weight of 12mm steel rebar per meter?
The theoretical weight of metric 12mm reinforcing steel bar is approximately 0.888 kg/m. This value is calculated using the nominal cross-sectional area and conventional steel density.
Q2. How much does one 12-meter-long 12mm rebar weigh?
A 12m bar weighs approximately 10.66kg theoretically. Actual acceptable weight variation depends on the applicable product standard and purchase agreement.
Q3. How many pieces of 12mm rebar are in one metric ton?
For 12m lengths, approximately 94 pieces correspond to one metric ton by theoretical weight. A 6m bar weighs approximately half as much, so the approximate piece count per tonne is correspondingly higher.
Q4. Is 12mm rebar the same as #4 rebar?
No. Metric 12mm rebar has a nominal diameter of 12.0mm. US #4 rebar has a nominal diameter of approximately 12.7mm. The different cross-sectional areas must be considered when preparing quotations and evaluating structural specifications.
Q5. What are the common grades of 12mm steel rebar?
Commonly requested reinforcement grades include HRB400, HRB400E, HRB500, HRB500E and BS 4449 B500B or B500C. The available grade must match the relevant project and material standard.
Q6. What is the difference between HRB400 and HRB500 rebar?
HRB400 and HRB500 are different specified yield-strength classes. HRB500 has a higher nominal yield-strength requirement, but material selection must also account for ductility, detailing, weldability and code requirements.
Q7. What does the letter E mean in HRB400E or HRB500E?
The E designation identifies a reinforcing steel grade with additional mechanical performance requirements for specified seismic applications under the applicable Chinese product standard. It does not, by itself, establish suitability for every seismic design.
Q8. Can 12mm steel rebar be welded?
Weldability depends on the reinforcing steel specification, chemical composition, carbon equivalent and approved welding procedure. ASTM A706 is commonly considered where controlled weldability is important. Welding must follow the applicable project and construction requirements.
Q9. Can 12mm steel rebar be bent?
Reinforcing bars may be bent when the selected grade and standard permit it. Required bend radii, bend angles, processing methods and any rebending restrictions must be respected. Coated and prefabricated bars may require additional controls.
Q10. Is galvanized or epoxy-coated 12mm rebar available?
Protective coating options may be evaluated for specified projects. Hot-dip galvanizing and epoxy coating are separate processing configurations, and availability must be confirmed with the required coating specification, tests and fabrication sequence.
Q11. What lengths of 12mm reinforcing bars can be supplied?
Common export requests include 6m, 9m and 12m straight bars. Custom cutting may also be considered, subject to production and processing capability. Final lengths and tolerances are agreed before ordering.
Q12. Can you provide a Mill Test Certificate for 12mm rebar?
Mill test certificates may be supplied according to the selected mill and contract requirements. Buyers should specify the document type, applicable standard, heat-number traceability and any third-party inspection requirements before order confirmation.
Q13. What is the minimum order quantity for 12mm rebar?
Minimum order quantity depends on the selected grade, standard, available stock, processing requirements and shipping arrangement. Please send the required tonnage and destination for confirmation.
Q14. How can I get the latest 12mm steel rebar price?
Please provide the product specification, grade, bar length, quantity and destination port. Dongmeng Group can review the request and provide a quotation based on current confirmed supply and freight conditions.
Request a Quote for 12mm Steel Rebar
Looking for a reliable 12mm steel rebar supplier for your construction or infrastructure project?
Dongmeng Group supports international importers, contractors, steel distributors and engineering procurement teams with specification-based steel reinforcement sourcing.
Send your project requirements to obtain a quotation covering the material grade, quantities, documentation, packaging and proposed delivery terms.
Office Information
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+86 157 6921 4734
+86 157 6921 4734
Contact
Office Address
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an, Shaanxi Province, China
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