Contact Info
- Tel: +86-311-87813582
- Fax: +86-311-87829648
- Email: Kaiwork@126.com
- Whatsapp: +86 86 138 3318 2035
- Add: No.345, Youyi North Street, Shijiazhuang City, Hebei Province, China.
Advanced Post-Tensioned Infrastructure Grade. Engineered strictly in accordance with ASTM A416 and PTI specifications, our 12.7mm (0.5 inch) unbonded prestressed concrete steel strand features high-performance anti-corrosion grease and a robust HDPE protective sheath, delivering ultimate breaking load performance, superior corrosion resistance, and certified compliance for modern civil engineering.
12.7mm (0.5 inch) Unbonded PC Strand | ASTM A416 Grade 270 Greased & Sheathed Strand
​Designed for critical post-tensioned floor systems, parking structures, and ground anchors under ASTM design codes. Every coil adheres to rigorous mechanical benchmarks.
|
Technical Parameter |
Specification Value |
Governing Standard |
|
Nominal Diameter |
12.7 mm (0.500 inch / 1/2") |
ASTM A416 / A416M |
|
Strand Configuration |
7-Wire (1 Center Wire + 6 Helical Outer Wires) |
ASTM A416 |
|
Nominal Cross-Sectional Area |
98.7 mm2 (0.153 in²) |
ASTM A416 |
|
Specified Tensile Strength |
Grade 270 (1860 MPa) |
ASTM A416 |
|
Minimum Breaking Load (MBL) |
≥ 183.8 kN (41,300 lbs) |
ASTM A416 |
|
Coating & Sheathing |
Anti-Corrosion Grease + Extruded HDPE/PP Sheath |
ASTM A960 / PTI Specs |
|
Relaxation Class |
Class 2 (Low Relaxation, Max 2.5% at 1000h) |
ASTM A416 / JIS G3536 |
· ​ASTM A416 Certified Compliance: The base steel strand is manufactured strictly to meet the mechanical and geometric requirements of ASTM A416 Grade 270.
· ​Dual-Layer Corrosion Protection: Uniformly coated with specialized microcrystalline anti-corrosion grease and tightly encased in a seamless, high-density polyethylene (HDPE) sheath to prevent moisture attack.
· ​Low-Relaxation Stability (Class 2): Advanced thermal-mechanical stabilization restricts stress relaxation to a maximum of 2.5% at 1000 hours, ensuring permanent prestressing force retention over extended lifecycles.
· ​Construction Efficiency: Unbonded tendons provide excellent flexibility and low friction during stressing, making them the preferred choice for flat-plate concrete floor systems.
​Engineered for modern high-load structural floor systems and geotechnical projects:
· ​Commercial & Residential Buildings: High-rise office buildings, multi-story parking structures, and flat-plate concrete floor systems.
· ​Industrial Structures: Large-span industrial floor slabs, foundations, and heavy-duty storage platforms.
· ​Geotechnical Engineering: Rock and soil anchor systems, slope stabilization, and foundation tie-backs.
​Q: Do these unbonded strands comply with ASTM A416 and PTI standards?
A: Yes. The base 7-wire strand complies strictly with ASTM A416 Grade 270, and the grease and HDPE sheathing meet relevant PTI (Post-Tensioning Institute) performance specifications.
​Q: What is the standard export packaging and container load?
A: Coils are securely strapped, wrapped in protective materials, and palletized to prevent damage to the plastic sheath during transit. A standard 20ft container loads approximately 20 to 27 metric tons.
​Q: Can we request third-party quality inspection prior to shipment?
A: Yes. We fully support independent pre-shipment inspections and audits conducted by recognized global agencies such as SGS, BV, Intertek, or TUV.
