: Reserved for specialized applications like medical devices or optical components requiring extreme accuracy. Class B (Medium Precision)
On your 2D drawing (PDF or CAD), add a general note: “All dimensions subject to ISO 20457:2020, tolerance grade PT3, Category A unless otherwise stated. Parting line dimensions subject to Category B multiplier.” iso 20457 tolerance table pdf
– 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 It replaces the now-withdrawn national standards such as DIN 16901 (Germany) and provides a globally harmonized approach. : Reserved for specialized applications like medical devices
Using the official document ensures that the data you are using is up-to-date, as standards are periodically reviewed and updated to reflect new technologies and industry practices. It replaces the now-withdrawn national standards such as