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(and its German equivalent DIN ISO 20457 ) is the primary international standard for specifying manufacturing tolerances of plastic molded parts
While exact values depend on material groups (shrinkage rates) and nominal dimensions, typical baseline performance for injection molding includes: Super-Ingenuity Standard Features: plus or minus 0.05 plus or minus 0.15 mm for small to medium parts. Critical Features: plus or minus 0.025 iso 20457 tolerance table pdf
Download our free ISO 20457-compliant tolerance table template (PDF) — fill in your material and process class to generate custom tolerances. (Link placeholder) (and its German equivalent DIN ISO 20457 )
The core of the standard lies in its tabulated data, organized into four tolerance classes: . The tables are not a single monolithic grid but are separated by the type of geometrical characteristic. The key tables within the ISO 20457 PDF document typically include: (Link placeholder) fine (f), medium (m), coarse (c),
| PT Grade | Description | Typical Application | |----------|-------------|----------------------| | PT1 | Very fine (high precision) | Medical devices, optical components, precision gears | | PT2 | Fine | Consumer electronics, automotive interior trim | | PT3 | Medium | Standard housings, toys, general purpose parts | | PT4 | Coarse | Large panels, containers, parts with thin walls | | PT5 | Very coarse | Very large mouldings (>1000 mm) or warpage-prone materials | | PT6 | Extremely coarse (no tolerance specified) | Reference only for design verification | | PT7 | Up to agreement | For contract-specific requirements |