Cross Sectional Tolerances for Metal Dimensions of Solid Shapes and Class B,C and D Hollow Shapes

Specified dimension | ALLOWABLE DEVIATION FROM SPECIFIED DIMENSION, PLUS OR MINUS |
All metal dimensions except those covered by Column 3 and Column 4 | All wall thicknesses completely enclosing space 70mm2 and over, except those covered by Column 4 | Wall thickness between adjacent voids enclosing space 70mm2 and over |
Column 1 | Column 2 | Column 3 | Column 4 |
| Circumscribing circle diameter (CCD) | Circumscribing circle diameter (CCD) | Circumscribing circle diameter (CCD) |
≤250 | >250 | ≤250 | >250 | ≤250 | >250 |
>1.0 >1.5 >3.0 | ≤1.5 ≤3.0 ≤4.0 | 0.15 0.15 0.20 | 0.35 0.35 0.40 | - 0.40 0.50 | 0.35 0.35 0.40 | -0.30 0.30 0.50 | - 0.50 0.70 |
>4.0 >5.0 >6.0 | ≤5.0 ≤6.0 ≤7.0 | 0.20 0.20 0.20 | 0.40 0.40 0.40 | 0.50 0.60 0.70 | 0.70 0.80 1.00 | 0.60 0.70 0.80 | 0.80 1.00 1.20 |
>7.0 >8.0 >9.0 | ≤8.0 ≤9.0 ≤10 | 0.20 0.20 0.20 | 0.40 0.40 0.40 | 0.80 0.90 1.00 | 1.20 1.30 1.50 | 1.00 1.10 1.20 | 1.00 1.10 1.20 |
>10 >11 >12 | ≤8.0 ≤9.0 ≤16 | 0.20 0.20 0.25 | 0.40 0.40 0.45 | 1.10 1.20 1.30 | 1.60 1.70 1.80 | 1.30 1.50 1.60 | 1.90 2.10 2.30 |
>13 >14 >15 | ≤14 ≤15 ≤16 | 0.25 0.25 0.25 | 0.45 0.45 0.45 | 1.40 1.50 1.60 | 2.00 2.20 2.00 | 1.70 1.80 2.00 | 2.50 2.60 2.80 |
>16 >20 >25 | ≤20 ≤25 ≤40 | 0.25 0.25 0.30 | 0.45 0.45 0.50 | 1.60 1.60 1.60 | 2.30 2.30 2.30 | 2.00 2.00 2.00 | 2.80 2.80 2.80 |
>40 >50 >100 | ≤50 ≤100 ≤150 | 0.40 0.60 0.90 | 0.60 0.90 1.10 | BY NEGOTIATION ONLY |
>150 >200 >250 | ≤200 ≤250 ≤300 | 1.10 1.40 * | 1.40 1.70 1.90 |
>300 >350 | ≤350 ≤400 | * * | 2.20 2.40 |
all dimesions in millimetres unless specified - tighter tolerances available on request
* Tolerances subject to negotiation
Cross Sectional Tolerances for Space Dimensions of Solid Shapes, and Class B, C and D Hollow Shapes
Refer to McKechnie Aluminium for Applications