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| Square and Rectangular Tubing | |||||||
| Wall Tolerance | |||||||
| Inches/Gauge | Decimal * | +/- 10% Nom.** | Max | Min | |||
| 18 ga | 0.049 | 0.005 | 0.054 | 0.044 | |||
| 16 ga | 0.065 | 0.007 | 0.072 | 0.059 | |||
| 14 ga | 0.083 | 0.008 | 0.091 | 0.075 | |||
| 13 ga | 0.095 | 0.010 | 0.105 | 0.086 | |||
| 12 ga | 0.109 | 0.011 | 0.120 | 0.098 | |||
| 11 ga | 0.120 | 0.012 | 0.132 | 0.108 | |||
| 1/8 | 0.125 | 0.013 | 0.138 | 0.113 | |||
| 10 ga | 0.134 | 0.013 | 0.147 | 0.121 | |||
| 9 ga | 0.148 | 0.015 | 0.163 | 0.133 | |||
| 7 ga | 0.180 | 0.018 | 0.198 | 0.162 | |||
| 3/16 | 0.188 | 0.019 | 0.206 | 0.169 | |||
| 6 ga | 0.203 | 0.020 | 0.223 | 0.183 | |||
| 1/4 | 0.250 | 0.025 | 0.275 | 0.225 | |||
| 5/16 | 0.313 | 0.031 | 0.344 | 0.281 | |||
| 3/8 | 0.375 | 0.038 | 0.413 | 0.338 | |||
| 1/2 | 0.500 | 0.050 | 0.550 | 0.450 | |||
| 5/8 | 0.625 | 0.063 | 0.688 | 0.563 | |||
| 3/4 | 0.750 | 0.075 | 0.825 | 0.675 | |||
| * Gauge designations are BWG (Birmingham Wire Gauge) | |||||||
| ** Thickness tolerances are per ASTM A500 and A513. Measurements should be taken | |||||||
| at the centers of the flats and do not include the weld seam. | |||||||
| 15 | |||||||