As an aid to users of the ACI Building Code, information on ASTM Steel sizes, areas, and weights of various steel reinforcement is presented.
ASTM STANDARD REINFORCING BARS
| Bar size, no. | Nominal diameter, in. | Nominal area, in.2 | Nominal weight, lb/ft |
| 3 | 0.375 | 0.11 | 0.376 |
| 4 | 0.500 | 0.20 | 0.668 |
| 5 | 0.625 | 0.31 | 1.043 |
| 6 | 0.750 | 0.44 | 1.502 |
| 7 | 0.875 | 0.60 | 2.044 |
| 8 | 1.000 | 0.79 | 2.670 |
| 9 | 1.128 | 1.00 | 3.400 |
| 10 | 1.270 | 1.27 | 4.303 |
| 11 | 1.410 | 1.56 | 5.313 |
| 14 | 1.693 | 2.25 | 7.65 |
| 18 | 2.257 | 4.00 | 13.60 |
ASTM STANDARD PRESTRESSING STRANDS, WIRES, AND BARS
| Type* | Nominal diameter, in. | Nominal area, in.2 | Nominal weight, lb/ft |
| Seven-wire strand (Grade 250) | 1/4 (0.250) | 0.036 | 0.122 |
| 5/16 (0.313) | 0.058 | 0.197 | |
| 3/8 (0.375) | 0.080 | 0.272 | |
| 7/16 (0.438) | 0.108 | 0.367 | |
| 1/2 (0.500) | 0.144 | 0.490 | |
| (0.600) | 0.216 | 0.737 | |
| Seven-wire strand (Grade 270) | 3/8 (0.375) | 0.085 | 0.290 |
| 7/16 (0.438) | 0.115 | 0.390 | |
| 1/2 (0.500) | 0.153 | 0.520 | |
| (0.520) | 0.167 | 0.570 | |
| (0.563) | 0.192 | 0.650 | |
| (0.600) | 0.217 | 0.740 | |
| (0.620) | 0.231 | 0.780 | |
| (0.700) | 0.294 | 1.000 | |
| Prestressing wire | 0.192 | 0.029 | 0.098 |
| 0.196 | 0.030 | 0.102 | |
| 0.250 | 0.049 | 0.170 | |
| 0.276 | 0.060 | 0.204 | |
| Prestressing bars (Type I, plain) | 3/4 | 0.44 | 1.50 |
| 7/8 | 0.60 | 2.04 | |
| 1 | 0.78 | 2.67 | |
| 1-1/8 | 0.99 | 3.38 | |
| 1-1/4 | 1.23 | 4.17 | |
| 1-3/8 | 1.48 | 5.05 | |
| Prestressing bars (Type II, deformed) | 5/8 | 0.28 | 0.98 |
| 3/4 | 0.42 | 1.49 | |
| 1 | 0.85 | 3.01 | |
| 1-1/4 | 1.25 | 4.39 | |
| 1-3/8 | 1.58 | 5.56 | |
| 1-3/4 | 2.58 | 9.10 | |
| 2-1/2 | 5.16 | 18.20 | |
| 3 | 6.85 | 24.09 |
*Availability of some strand, wire, and bar sizes should be investigated in advance.
