Allowable Dimensional Tolerances

No. Standard Part Classification of Standard Dimensions Standard Values* Example
Normal bending R bending (FR bending)
Plate thickness≦10mm Plate thickness>10mm Plate thickness≦3.2mm
1 Section with no bending 6 or less ±0.1 ±0.3 ±0.3 Example
More than 6, equal to or less than 30 ±0.2 ±0.5 ±0.5
More than 30, equal to or less than 120 ±0.3 ±0.8 ±0.8
More than 120, equal to or less than 400 ±0.5 ±1.2 ±1.2
More than 400, equal to or less than 1,000 ±0.8 ±2.0 ±2.0
More than 1,000, equal to or less than 2,000 ±1.2 ±3.0 ±3.0
2 Section with bending 6 or less ±0.3 ±0.5 ±0.5
More than 6, equal to or less than 30 ±0.5 ±1.0 ±1.0
More than 30, equal to or less than 120 ±0.8 ±1.5 ±1.5
More than 120, equal to or less than 400 ±1.2 ±2.5 ±2.5
More than 400, equal to or less than 1,000 ±2.0 ±4.0 ±4.0
More than 1,000, equal to or less than 2,000 ±3.0 ±6.0 ±6.0
  • *General tolerance for JIS B 0408 metal pressed products: use Grade B (plate thickness≦10mm), Grade C (plate thickness>10mm). For R bend it will be Grade C.
  • *If a painting/coating is specified, the standard value for material conditions is used.

The allowable dimensional tolerances are applicable only for dimensions for between holes on the same face and end-faces/perpendicular-faces that are adjacent as a result of the bending.
The tolerances are not applicable for hole-to-hole or hole-to-end face dimensions on non-adjacent faces (across multiple bent sections).

Example 1) Dimensions for which allowable dimensional tolerances are applicable

Example 2) Dimensions for which allowable dimensional tolerances are not applicable