Wall Thickness Tolerances for Class A Hollow Shapes
Specified wall thickness (see note) | Allowable deviation from specified dimension for round tube, square and rectangular hollows, plus or minus |
Circumscribing circlediameter (CCD)≤125 | Circumscribing circlediameter (CCD)>125 |
>1.0 | ≤1.5 | 0.2 | 0.25 |
>1.5 | ≤2.5 | 0.25 | 0.25 |
>2.5 | ≤3 | 0.30 | 0.30 |
>3.0 | ≤4.0 | 0.35 | 0.35 |
>4.0 | ≤5.0 | 0.40 | 0.45 |
>5.0 | ≤6.0 | 0.50 | 0.55 |
>6.0 | ≤7.0 | 0.60 | 0.65 |
>7.0 | ≤8.0 | 0.65 | 0.75 |
>8.0 | ≤9.0 | 0.70 | 0.85 |
>9.0 | ≤10.0 | 0.70 | 0.95 |
>10.0 | ≤11.0 | 0.75 | 1.05 |
>11.0 | ≤12.0 | 0.80 | 1.15 |
>12.0 | ≤13.0 | 0.85 | 1.25 |
>13.0 | ≤14.0 | 0.90 | 1.35 |
>14.0 | ≤15.0 | 0.95 | 1.45 |
>15.0 | ≤20.0 | 1.00 | 1.55 |
>20.0 | ≤25.0 | 1.25 | 1.65 |
>25.0 | ≤40.0 | 1.50 | 1.75 |
all dimesions in millimetres unless specified - tighter tolerances available on request
Note: When the dimensions specified are outside and inside, rather than wall thickness itself, the allowable deviation of the wall thickness applies to the mean wall thickness. The mean wall thickness is the average of the maximum and minimum measured wall thickness, when measured at the ends of the cut length.