Iso | 20457 Tolerance Table Pdf !link!

| Standard | Material Focus | Key Feature | |----------|----------------|--------------| | ISO 20457 | Plastics (moulded) | PT grades, parting line allowances | | ISO 286 | Metals / machined | IT grades, very tight | | ISO 2768 (general tolerances) | Metals & plastics (vague) | Often too tight for plastics | | DIN 16901 | Old German standard for plastics | Replaced by ISO 20457 in 2020 |

Enter – Plastics moulded parts – Tolerances and acceptance conditions . If you have been searching for the “iso 20457 tolerance table pdf” , you are likely facing the challenge of specifying realistic, cost-effective tolerances for injection-moulded components. This article provides a complete breakdown of the standard, explains how to interpret its tolerance tables, and guides you on obtaining and using the official PDF. What is ISO 20457? ISO 20457 is the first international standard dedicated exclusively to the dimensional tolerances of injection-moulded and compression-moulded plastic parts. Published in 2020, it replaces the outdated practice of applying metal-based tolerance systems (like ISO 286) to polymers. iso 20457 tolerance table pdf

PT2 tolerance: ±0.30 mm

Compare this to ISO 286 for metal (IT7 grade for 100–200 mm: about ±0.035 mm). The plastic tolerance is nearly 10x wider. This illustrates the core lesson of ISO 20457: | Standard | Material Focus | Key Feature