01
Full ASTM A416 compliance
Supplied as 1/2 inch seven-wire strand in Grade 270 (1860 MPa) low relaxation, matching the standard written in the approved specification.
ASTM A416 Grade 270
Low Relaxation
7-Wire
184 kN MBL
Prestressed Concrete Strand
12.7mm ASTM A416 Low Relaxation PC Strand
ASTM A416 Grade 270 Low Relaxation
12.7mm (1/2 inch) 7-wire prestressing steel strand conforming to ASTM A416 Grade 270 low relaxation. Widely used in bridges, buildings, and prestressed concrete elements.
| Diameter | 12.7 mm (1/2 inch) |
|---|---|
| Grade | 270 ksi (1860 MPa) |
| Type | Low Relaxation |
| Structure | 7-wire |
| Min Breaking Load | 184 kN |
| Elongation | ≥ 3.5% |
Key features
Why engineers specify this strand
Four reasons 12.7 mm low-relaxation strand suits medium-span prestressing.
02
Superior bond performance
Good transfer and anchorage behaviour in cast-in-place and precast post-tensioning systems.
03
Optimized for medium-span structures
A moderate prestressing force per tendon for bridges, buildings and prestressed concrete elements.
04
Widely specified by international consultants
A familiar, well-documented strand size that fits established post-tensioning design practice.
Technical answer
What is 12.7 mm low-relaxation PC strand?
Definition
12.7 mm (1/2 inch) low-relaxation PC strand is a seven-wire, high-strength prestressing steel cable manufactured to ASTM A416 Grade 270 (1860 MPa) with a minimum breaking load of 184 kN and minimum elongation of 3.5%. It sits between the 9.53 mm and 15.24 mm sizes, so it delivers a moderate prestressing force per tendon with full ASTM A416 compliance, superior bond performance and low-relaxation behaviour that keeps long-term stress losses predictable.
Typical applications include bridges, buildings and prestressed concrete elements, with the size optimised for medium-span structures and widely specified by international consultants. Global Overseas manufactures the strand on German Mannesmann production lines and tests it to ASTM A416, and third-party inspection by SGS, BV or Intertek can be arranged before shipment from Qingdao. State the standard, coil weight or cut length, quantity and destination port in the inquiry.
Specification
What to state in the RFQ
Nominal diameter 12.7 mm, standard (ASTM A416 or an equivalent), grade, low-relaxation requirement, coil weight or cut length, quantity, packing method, destination port and any approved-vendor or inspection requirement.
Compatibility
Anchorage and equipment
Confirm the approved anchorage, wedge and jack interface before ordering. Strand selection must follow the project engineer’s drawings and the anchorage supplier’s compatibility requirements.
Related products
Other strand diameters
Prestressed Concrete Strand
9.53mm ASTM A416 Low Relaxation PC Strand
3/8 inch seven-wire strand for precast concrete and smaller tendons.
View details
Prestressed Concrete Strand
15.24mm ASTM A416 Low Relaxation PC Strand
The primary strand size for long-span bridges and heavy civil works.
View detailsRequest a 12.7mm PC strand quotation
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