20 mm B500B Steel Rebar
The 20mm rebar diameter is the structural workhorse for columns, beams, foundations and piles — combining manageable weight with high load-carrying capacity. Grade B500B, fully compliant with DIN 488 and EN 10080, available for export with Mill Test Certificate EN 10204 3.1.
Technical Specification: 20mm Rebar (B500B)
The 20 mm B500B rebar is one of the most widely specified diameters in structural concrete design under Eurocode 2 (EN 1992-1-1). At a nominal mass of 2.468 kg per metre and a nominal cross-sectional area of 314.2 mm², it delivers an excellent balance between reinforcement ratio and handling efficiency on site.
Grade B500B guarantees a minimum characteristic yield strength (fyk) of 500 MPa, a strength-to-yield ratio k ≥ 1.08, and a total elongation at maximum force (Agt) ≥ 5.0% — the high-ductility class required in seismically active zones and moment-resisting frames worldwide.
| Property | Value |
|---|---|
| Diameter (nominal) | 20 mm |
| Nominal mass | 2.468 kg/m |
| Cross-sectional area | 314.2 mm² |
| Bars per tonne (12 m) | ≈ 34 bars (≈ 405 m) |
| Grade | B500B (DIN 488, EN 10080) |
| Min. yield strength (fyk) | 500 MPa |
| Ductility class | B (k ≥ 1.08, Agt ≥ 5.0%) |
| Surface | Hot-rolled ribbed |
| Stock lengths | 6–18 m (typically 12 m) |
Typical Applications for 20mm Rebar
Where 20mm B500B rebar is specified by structural engineers
Columns & Beams
Primary longitudinal reinforcement in reinforced concrete columns and beams. The 314.2 mm² section provides substantial tensile capacity while remaining easy to place and tie.
Foundations & Pile Caps
Widely used in strip footings, raft foundations and pile caps where bending moments demand larger bar diameters. Links well with 10–16 mm stirrups for confinement.
Infrastructure & Bridges
Specified for bridge decks, abutments and retaining walls. High-ductility B500B class meets seismic detailing requirements under EN 1998 (Eurocode 8).
Weight Table: 20mm Rebar — Common Lengths
Use the table below for bill-of-materials calculations. All values use the DIN 488 formula: mass (kg/m) = d²(mm) × 0.00617.
| Length | Mass per bar (kg) | Bars per tonne |
|---|---|---|
| 6 m | 14.81 kg | ≈ 68 |
| 9 m | 22.21 kg | ≈ 45 |
| 12 m | 29.62 kg | ≈ 34 |
| 18 m | 44.42 kg | ≈ 23 |
For mixed-diameter orders, refer to our full rebar weight chart (kg per metre) covering all standard sizes from 6 mm to 40 mm. See also the complete steel grades guide for B500A, B500B and B500C properties.
Export & Documentation
Every shipment of 20mm B500B rebar is backed by full DIN 488 / EN 10080 documentation
Mill Test Certificate 3.1
EN 10204 type 3.1 MTC with heat number, chemical analysis and mechanical test results.
Certificate of Origin
German or EU certificate of origin, accepted for customs clearance in most destination markets.
Seaworthy Bundling
Bundles typically ≈ 2 t, strapped and labelled. Container or break-bulk shipment to any port.
CE / DoP
Declaration of Performance confirming conformity with EN 10080 for use in structural concrete across the EU and export markets.
Frequently Asked Questions — 20mm Rebar
What is the exact weight of a 20mm rebar bar per metre?
What is the cross-sectional area of 20mm rebar?
How many 20mm rebar bars fit in a 20-foot container?
Is 20mm B500B rebar suitable for seismic design?
Can I order 20mm rebar cut and bent to specific shapes?
Source German-standard 20mm rebar with full export documentation
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