dear sir, Please find below the specification for pc strands and wires â?¢ 7 wire pc strands of nominal diameter 7.9mm according to: ASTM A-416 grade270, low relaxation â?¢ 3 wire pc strands of nominal diameter 5.2mm according to: ASTM A-416 grade270, low relaxation â?¢ Pc wire Diameter of wire:5.0mm/7.0mm Quality standard: ASTM-A-421 Yield load: 1330-1350Mpa Breaking strength: 1570 Mpa Elongation :> =2.5 1000H relaxation: initial load 70%.5.6 Show More