T12 Rebar - 12mm High Tensile Reinforcement Bar
Alternative Names: T12 Rebar, H12 Rebar, 12mm Rebar, 12mm Reinforcement Bar, 12mm Steel Bar, 12mm 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, Slab Reinforcement Bar, Column Bar, BS4449 Rebar, CARES Approved Rebar
T12 rebar (also specified as H12) is the workhorse of UK reinforcement: a 12mm Grade B500B high-tensile bar that appears in almost every housing and light-commercial project. Rolled to BS 4449:2005 with a ribbed surface for strong bond to concrete, it offers the best balance of strength and workability across the range. Its 12mm diameter is heavy enough for most structural detailing yet still bends cleanly, which is why specifiers default to it for everyday reinforcement.
Typical applications
- Ground-bearing and suspended slabs
- Strip and pad foundations and ground beams
- Lintels and low-rise columns
- Driveways, garden and retaining walls
- General-purpose reinforcement across housing and extensions
Why buy from Next Day Steel
As our highest-turnover bar, 12mm rebar is always in stock for next-day delivery in both 3m and 6m lengths, fully CARES certified. Because we move so much of it, availability is rarely an issue: order today for next-day delivery across most of the UK. Browse every rebar diameter, or combine with reinforcement mesh for slabs.
Got a schedule of bent bars? Send it to us and we'll price it the same day.
T12 (12mm) bar lengths & weights
- Weight per bar
- 2.66 kg
- Price
- £6.38 + VAT
- Weight per bar
- 5.32 kg
- Price
- £9.58 + 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 you are here | 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 | 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 |
T12 rebar: frequently asked questions
What is T12 rebar used for?
T12 (12mm) high-tensile rebar is used for ground-bearing and suspended slabs, strip footings and general reinforcement across housing projects. The ribbed profile bonds the bar to the concrete so the two work together under load.
What does the T in T12 mean, and is it the same as H12?
The T stands for high-tensile (high-yield) steel. T12, H12 and 12mm rebar all describe the same bar: Grade B500B deformed reinforcing bar to BS 4449:2005 with a 12mm nominal diameter.
How much does a T12 bar weigh?
A 3m T12 bar weighs 2.66 kg, and A 6m T12 bar weighs 5.32 kg. Nominal mass for 12mm bar is shown in the comparison table above.
How much does 12mm rebar cost?
T12 rebar starts from £6.38 + 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 T12 rebar manufactured to?
Our 12mm 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
