ASTM A 416/A 416M Steel Strand, 
Uncoated Seven-Wire for Prestressed Concrete

ASTM A416 Steel Strand, Uncoated Seven-Wire for Prestressed Concrete

Breaking Strength Requirements

Strand Designation No. Diameter of Strand, mm [in.] Minimum Breaking
Strength of Strand, kN [lbf]
Steel Area of Strand,
mm2[in.2]
Weight of Strand kg/1000 m [lb/1000 ft]
Grade 1725 [250]
6 6.4 [0.250] 40.0 [9 000] 23.2 [0.036] 182 [122]
8 7.9 [0.313] 64.5 [14 500] 37.4 [0.058] 294 [197]
9 9.5 [0.375] 89.0 [20 000] 51.6 [0.080] 405 [272]
11 11.1 [0.438] 120.1 [27 000] 69.7 [0.108] 548 [367]
13 12.7 [0.500] 160.1 [36 000] 92.9 [0.144] 730 [490]
15 15.2 [0.600] 240.2 [54 000] 139.4 [0.216] 1094 [737]
Grade 1860 [270]
9 9.53 [0.375] 102.3 [23 000] 54.8 [0.085] 432 [290]
11 11.11 [0.438] 137.9 [31 000] 74.2 [0.115] 582 [390]
13 12.70 [0.500] 183.7 [41 300] 98.7 [0.153] 775 [520]
15 15.24 [0.600] 260.7 [58 600] 140.0 [0.217] 1102 [740]

 

Yield Strength Requirements

Strand Designation No. Nominal Diameter of Strand, mm [in.] Initial Load, kN [lbf] Minimum Load at 1 % Extension, kN [lbf]
Low-Relaxation Normal-Relaxation
Grade 1725 [250]
6 6.4 [0.250] 4.0 [900] 36.0 [8 100] 34.0 [7 650]
8 7.9 [0.313] 6.5 [1 450] 58.1 [13 050] 54.7 [12 300]
9 9.5 [0.375] 8.9 [2 000] 80.1 [18 000] 75.6 [17 000]
11 11.1 [0.438] 12.0 [2 700] 108.1 [24 300] 102.3 [23 000]
13 12.7 [0.500] 16.0 [3 600] 144.1 [32 400] 136.2 [30 600]
15 15.2 [0.600] 24.0 [5 400] 216.2 [48 600] 204.2 [45 900]
Grade 1860 [270]
9 9.53 [0.375] 10.2 [2 300] 92.1 [20 700] 87.0 [19 550]
11 11.11 [0.438] 13.8 [3 100] 124.1 [27 900] 117.2 [26 350]
13 12.70 [0.500] 18.4 [4 130] 165.3 [37 170] 156.1 [35 100]
15 15.24 [0.600] 26.1 [5 860] 234.6 [52 740] 221.5 [49 800]