What Are the Sizes of Rebar?
Standardized Dimensions for Structural Excellence
Rebar Sizes: From Residential to Industrial Applications
Rebar sizes are standardized globally to ensure compatibility with engineering codes like ASTM A615, BS 4449, and ISO 3766. Below, we outline common rebar sizes, their dimensions, and typical applications, supported by technical data and expert insights.
Standard Rebar Sizes & Specifications
| Rebar Number | Diameter (Imperial) | Diameter (Metric) | Weight per Foot (lbs) | Key Applications | Compliance Standards |
|---|---|---|---|---|---|
| #3 | 0.375″ (3/8″) | 9.5 mm | 0.376 | Light slabs, sidewalks, patios | ASTM A615, BS 4449 |
| #4 | 0.500″ (1/2″) | 12.7 mm | 0.668 | Driveways, footings, retaining walls | ASTM A615, ISO 3766 |
| #5 | 0.625″ (5/8″) | 15.9 mm | 1.043 | Bridges, heavy-duty foundations | ASTM A706, GB1499.2 |
| #6 | 0.750″ (3/4″) | 19.1 mm | 1.502 | High-rise columns, industrial floors | ASTM A615, EN 10080 |
| #8 | 1.000″ (1″) | 25.4 mm | 2.670 | Seismic-resistant structures | ASTM A615, ISO 3766 |
| #10 | 1.270″ (1-1/4″) | 32.3 mm | 4.303 | Dams, nuclear plants, marine projects | ASTM A615, BS 4449 |
Note: Metric equivalents (e.g., HRB400) are widely used in Asia and Europe, with diameters ranging from 12mm to 32mm.
Expert Commentary
Darren Tracy, P.E. (West Branch Engineering):
*”Selecting the correct rebar size is critical for load-bearing capacity. For example, #4 rebar (12.7mm) is ideal for footings, but improper spacing or cover (e.g., <3 inches in ground-contact concrete) can reduce lifespan by 30%”.*
Prof. Zhang Li, Materials Engineer:
“Innovations like GFRP rebar (3mm–32mm) offer corrosion resistance and lightweight alternatives, with tensile strength exceeding steel by 20% in harsh environments”.
Performance Data Chart
Figure 1: Load capacity increases with diameter (Source: ASTM A615).
Why Choose Our Rebar Solutions?
✅ Global Compliance: Certified to ASTM, BS, and ISO standards.
✅ Custom Sizes: Metric (12mm–32mm) and imperial (#3–#10) options.
✅ Sustainability: Recyclable steel and low-carbon GFRP alternatives.
Closing Reflection
“Why settle for uncertainty when precision-sized rebar ensures structural integrity and compliance?”
References
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ASTM A615 Rebar Standards.
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Concrete Cover Requirements (ACI 318-19) .
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GFRP Rebar Applications.
For bulk orders or technical support, contact our engineering team.
Note: Data and charts are illustrative. Consult licensed professionals for project-specific designs.