T20 Rebar - 20mm High Tensile Reinforcement Bar
Alternative Names: T20 Rebar, H20 Rebar, 20mm Rebar, 20mm Reinforcement Bar, 20mm Steel Bar, 20mm Reinforcing Bar, Reinforcing Steel, Steel Reinforcing Bar, High Tensile Rebar, High Tensile Steel Bar, Deformed Bar, Ribbed Bar, Ribbed Steel Bar, Concrete Reinforcing Bar, Groundworks Steel, Steel Rod, Straight Bar, Stock Bar, Ground Beam Steel, Foundation Bar, Beam Reinforcement Bar, Column Bar, Structural Rebar, Heavy Duty Rebar, BS4449 Rebar, CARES Approved Rebar
T20 rebar (also specified as H20) is a 20mm Grade B500B bar built for genuinely structural loads. Manufactured to BS 4449:2005 with a high-tensile, ribbed profile, it is a mainstay of commercial frames, basements and retaining structures where smaller diameters no longer provide enough capacity. From this diameter upward, reinforcement is firmly the engineer's domain, and T20 is one of the most widely specified heavy bars on commercial sites.
Typical applications
- Heavily loaded beams and columns in multi-storey frames
- Transfer structures and basement or raft slabs
- Retaining walls and bridge abutments
- Piling cages and pile caps
- Heavy industrial bases
Why buy from Next Day Steel
We stock 20mm rebar in depth for next-day delivery in 3m and 6m lengths, every bar CARES approved with full traceability. Because we keep larger diameters in quantity, even sizeable schedules ship quickly, and we can cut and bend complex shapes to order. Explore the full reinforcement bar range or our welded rebar cages.
Have a bending schedule? Send it over for a same-day cut-and-bent quote.
T20 (20mm) bar lengths & weights
- Weight per bar
- 7.4 kg
- Price
- £11.10 + VAT
- Weight per bar
- 14.8 kg
- Price
- £22.19 + VAT
Rebar size comparison (BS 4449, Grade B500B)
High-tensile ribbed reinforcing bar to BS 4449:2005. T and H prefixes both denote Grade B500 high-yield bar; the number is the diameter in millimetres. Click a size to view it.
| Size | Diameter | Mass (kg/m) | Bar area (mm²) | Stock lengths | Typical use |
|---|---|---|---|---|---|
| T8 | 8mm | 0.395 | 50 | 3m & 6m | Links, stirrups, light detailing |
| T10 | 10mm | 0.617 | 79 | 3m & 6m | Links, ground beams, domestic foundations |
| T12 | 12mm | 0.888 | 113 | 3m & 6m | Slabs, footings, general RC work |
| T16 | 16mm | 1.579 | 201 | 3m & 6m | Beams, columns, pile caps, retaining walls |
| T20 you are here | 20mm | 2.466 | 314 | 3m & 6m | Heavy frames, rafts, basements |
| T25 | 25mm | 3.854 | 491 | 6m | Large columns, piles, transfer beams |
| T32 | 32mm | 6.313 | 804 | 6m | Bridges, deep foundations, cores |
| T40 | 40mm | 9.864 | 1257 | 6m | Major civils, heaviest foundations |
T20 rebar: frequently asked questions
What is T20 rebar used for?
T20 (20mm) high-tensile rebar is used for heavily loaded beams and columns, transfer structures, basements and raft slabs. The ribbed profile bonds the bar to the concrete so the two work together under load.
What does the T in T20 mean, and is it the same as H20?
The T stands for high-tensile (high-yield) steel. T20, H20 and 20mm rebar all describe the same bar: Grade B500B deformed reinforcing bar to BS 4449:2005 with a 20mm nominal diameter.
How much does a T20 bar weigh?
A 3m T20 bar weighs 7.4 kg, and A 6m T20 bar weighs 14.8 kg. Nominal mass for 20mm bar is shown in the comparison table above.
How much does 20mm rebar cost?
T20 rebar starts from £11.10 + VAT per bar, with current per-length prices shown above. Bulk-buy discounts apply automatically as weight is added to the cart, and cut and bent shapes are priced from your bending schedule.
What standard is T20 rebar manufactured to?
Our 20mm bar is Grade B500B high-tensile ribbed rebar to BS 4449:2005, CARES approved with full mill traceability. (Reinforcement is certified through the CARES scheme rather than CE marking, as EN 10080 is not a harmonised standard.)
Groundworks
Frequently Bought Together
