Searching for an typically means you want immediate access to these numerical values without purchasing the full 30-page document. However, understanding the logic behind the table is essential before applying any numbers.
To get the :
It reduces disputes between part designers and molders by setting clear boundaries. Factors Influencing Plastic Tolerances iso 20457 tolerance table pdf
The standard categorizes dimensions into groups (TG1 to TG9), where is the most common industry standard for thermoplastics. Dimensional Deviations:
Your drawing must classify each dimension using ISO 20457’s three categories: Searching for an typically means you want immediate
– Plastics — Tolerances for moulded parts – is an international standard that specifies a system of tolerances for the general dimensions of injection-moulded and compression-moulded plastic parts. It replaces the now-withdrawn national standards such as DIN 16901 (Germany) and provides a globally harmonized approach.
| 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 | | PT Grade | Description | Typical Application
For design engineers and procurement professionals, downloading an is essential to establish standardized, cost-effective, and technically achievable manufacturing boundaries. Setting excessively tight tolerances drives up mold tooling costs exponentially, while overly loose parameters risk assembly failures. This article breaks down how the standard works, how to read the tables, and why it is critical for modern plastics manufacturing. What is ISO 20457:2018?
Ranges from TG1 (extremely precise) to TG9 (very coarse). TG6 is the typical standard for injection molding.