|link| - En Iso 13920-bf

| Nominal Angle Leg Length (mm) | Permitted Deviation (Class B) | | :--- | :--- | | Up to 400 | ± 30 minutes (± 0.5°) | | 400 to 1,000 | ± 20 minutes (± 0.33°) | | Over 1,000 | ± 15 minutes (± 0.25°) |

: This refers to the tolerance class for linear and angular dimensions (length, width, height, and angles) . It is based on "customary workshop accuracy" and is the most common class used in general engineering . en iso 13920-bf

is a technical specification used in engineering drawings to define general tolerances for welded constructions . It ensures that parts are manufactured to a consistent, economically viable level of precision without requiring individual tolerances for every dimension. Breakdown of the Specification | Nominal Angle Leg Length (mm) | Permitted

You aren't paying for "precision machining" tolerances on a heavy structural frame where they aren't needed. Interchangeability: It ensures that parts are manufactured to a