Wire Shoppe P Ltd · Nagpur, India
12.9 mm vs 15.2 mm LRPC Strand
Both listed sizes are 7-wire LRPC strand with nominal tensile strength of 1860 MPa and a 3.5% minimum elongation. Their area, loads and weight per metre differ.
Weight per metre: quick answer
The 15.2 mm strand weighs about 39% more per metre, in line with its larger 139 mm² area versus 100 mm².
"HT strand" is a common search term for high-tensile prestressing strand. These weights apply only to the listed 12.9 mm and 15.2 mm Tata 7-wire LRPC strand, not to the separate 3 mm × 3-ply HT strand product.
- 12.9 mm LRPC strand: 781 g/m, i.e. 0.781 kg per metre (about 78.1 kg per 100 m).
- 15.2 mm LRPC strand: 1,086 g/m, i.e. 1.086 kg per metre (about 108.6 kg per 100 m).
Side-by-side values
- 12.9 mm: 100 mm² area; 186 kN minimum breaking load; 164 kN proof load / load at 1% extension; 781 g/m nominal unit weight.
- 15.2 mm: 139 mm² area; 259 kN minimum breaking load; 228 kN proof load / load at 1% extension; 1,086 g/m nominal unit weight.
- Both: 7-wire construction; 1860 MPa nominal tensile strength; 3.5% minimum elongation; IS 14268:2022.
Weight and length compared
Formula: mass (kg) = length (m) × kg/m; length (m) = mass (kg) ÷ kg/m.
- 12.9 mm example: 500 m × 0.781 kg/m = 390.5 kg (nominal).
- 15.2 mm example: 3,000 kg ÷ 1.086 kg/m ≈ 2,762 m (nominal).
| Size | g/m | kg/m | kg per 100 m | Approx. m per metric tonne |
|---|---|---|---|---|
| 12.9 mm LRPC strand | 781 | 0.781 | 78.1 | about 1,280 m |
| 15.2 mm LRPC strand | 1,086 | 1.086 | 108.6 | about 921 m |
Calculated from nominal unit weight. Actual coil weight and length vary within the manufacturer's tolerance; these are estimates, not a weighed-coil guarantee.
Which size should procurement request?
Use the size specified in the approved structural drawings and project documents. This comparison is descriptive and does not recommend a design substitution.
Request a quote
Share the specified size, quantity and delivery destination to request current commercial pricing.
Frequently asked questions
Which is heavier per metre, 12.9 mm or 15.2 mm strand?
15.2 mm: 1,086 g/m versus 781 g/m for 12.9 mm (nominal).
How many metres are in one tonne?
About 1,280 m of 12.9 mm or about 921 m of 15.2 mm, calculated from nominal unit weight.
Can I substitute one size for the other?
Only as directed by the approved design; this page does not recommend substitutions.