Iso 20457 Tolerance Table Pdf [ 1080p – UHD ]

Crucially, the standard explicitly excludes certain features from these general tables—for example, chamfered edges of screw threads, or dimensions that directly affect assembly of critical safety components.

ISO 20457 is a widely adopted standard that defines a set of tolerances for various features, including:

While the ISO 20457 tolerance table is a powerful tool, it is not a universal solution. The PDF document makes clear that general tolerances are default values. They apply only when no individual tolerance is specified. For features that require a precise fit (e.g., a bearing housing or a gear shaft center distance), the designer must still assign explicit, tighter tolerances. Furthermore, the standard does not cover every geometric characteristic—profile tolerances (for curved surfaces) are notably absent, as are tolerances for free-form surfaces.