The standard categorizes dimensions into groups (TG1 to TG9), where is the most common industry standard for thermoplastics. Dimensional Deviations:
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Achieving a target tolerance grade is not just a matter of selecting a column on a PDF chart. The following variables heavily dictate real-world dimensional variance: Material Shrinkage ( VScap V sub cap S The standard categorizes dimensions into groups (TG1 to
TG6 is widely used for standard thermoplastic parts in applications such as packaging and general consumer goods. Many commercial manufacturers specify ISO 20457 TG6 as their default general tolerance for thermoplastics. ISO 20457 (full title: “Plastics moulded parts —
A universal language between designers and molders worldwide.
ISO 20457 (full title: “Plastics moulded parts — Tolerances and acceptance conditions”) specifies possible manufacturing tolerances for plastic molded parts. First published in 2018, this standard replaced national standards such as Germany’s DIN 16742, bringing a unified global framework for plastic part tolerancing. The standard applies to all integral features with general tolerances, using a surface profile tolerance within a specified datum system, and allows for additional specifications when functional needs require tighter control.
If you are looking for an or trying to understand how to apply these tolerance groups to your engineering drawings, this comprehensive guide breaks down everything you need to know. 1. What is ISO 20457?