When engineers search for the "ISO 20457 tolerance table PDF," they are typically looking for specific dimensional data. While the full standard is a copyrighted document available for purchase through the ISO store or national standards bodies (like ANSI, DIN, or BSI), understanding the structure of these tables is crucial for those working with the document.
| 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 | iso 20457 tolerance table pdf
If you have been searching for the you are likely looking for a clear, actionable reference for geometrical product specification (GPS) and verification. This article serves as your complete resource. We will explain what ISO 20457 is, why the tolerance table matters, how to interpret it, and where to find legitimate PDF versions. When engineers search for the "ISO 20457 tolerance
It applies specifically to , die castings, and similar processes. Unlike general machining tolerances, moulded parts have unique shrinkage, warpage, and draft angle requirements. This article serves as your complete resource
Ranges from TG1 (extremely precise) to TG9 (very coarse). TG6 is the typical standard for injection molding.
Most moulders can reliably hold PT2 for well-designed tools and stable materials. PT1 is only achievable with automated cells, hot runners, and 100% inspection.