28 mm B500B Steel Rebar
28mm rebar is the large-diameter specialist for heavy columns, bored piles, bridge piers and transfer structures. Grade B500B to DIN 488 / EN 10080 with nominal mass 4.837 kg/m and cross-section 615.8 mm². Supplied with EN 10204 3.1 Mill Test Certificate and full export documentation.
Technical Specification: 28mm Rebar (B500B)
The 28 mm B500B rebar sits at the transition between medium and heavy structural diameters. With a nominal mass of 4.837 kg per metre and a cross-sectional area of 615.8 mm², it provides substantial tensile capacity while remaining within the bendability limits of most automatic stirrup-bending equipment.
Grade B500B guarantees fyk = 500 MPa minimum, k ≥ 1.08 and Agt ≥ 5.0%, satisfying ductility class B under EN 10080 and DIN 488. The hot-rolled ribbed surface ensures full anchorage and bond in normal and high-strength concrete.
| Property | Value |
|---|---|
| Diameter (nominal) | 28 mm |
| Nominal mass | 4.837 kg/m |
| Cross-sectional area | 615.8 mm² |
| Bars per tonne (12 m) | ≈ 17 bars (≈ 207 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 28mm Rebar
Engineering contexts where 28mm B500B provides the optimal diameter choice
Heavy Columns & Piles
Longitudinal reinforcement in high-load columns and bored piles. The 615.8 mm² cross-section provides 23% more capacity than 25 mm, allowing cage designs with fewer, larger bars and improved concrete pours.
Bridge Piers & Abutments
Heavily loaded bridge substructure elements frequently specify 28 mm bars for primary pier reinforcement. High-ductility B500B properties satisfy seismic bridge detailing requirements.
Transfer Structures
Transfer beams and plates carrying multiple columns are among the most demanding reinforcement tasks. 28 mm bars help minimise bar count while maintaining full tensile capacity.
Weight Table: 28mm Rebar — Common Lengths
Reference weights calculated using d²(mm) × 0.00617 per metre (DIN 488 standard formula).
| Length | Mass per bar (kg) | Bars per tonne |
|---|---|---|
| 6 m | 29.02 kg | ≈ 34 |
| 9 m | 43.53 kg | ≈ 23 |
| 12 m | 58.04 kg | ≈ 17 |
| 18 m | 87.07 kg | ≈ 11 |
For the complete weight reference from 6 mm to 40 mm, see our rebar weight chart. For technical grade comparisons, visit the steel grades page.
Couplers as an Alternative to Lap Splices
At 28 mm diameter, mechanical splicing becomes particularly cost-effective
Reduced Congestion
Lap splices for 28 mm bars require approximately 50–70 bar diameters (1,400–1,960 mm). Mechanical couplers eliminate the overlap and reduce steel consumption by the lap length weight.
Faster Installation
Threaded or swaged couplers for 28 mm rebar connect in seconds without wire-tying or complex lap arrangements. Critical path time saving in column-heavy structures.
EN 1992-1-1 Compliant
Mechanical splices meeting Annex C of EN 1992-1-1 can replace laps in most structural situations. View coupler options →
Frequently Asked Questions — 28mm Rebar
What is the weight of 28mm rebar per metre?
What is the cross-section of 28mm rebar?
Is 28mm rebar a standard DIN 488 diameter?
What is the minimum bend diameter for 28mm B500B rebar?
What documentation comes with 28mm B500B rebar for export?
Source German-standard 28mm rebar with full export documentation
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