Iso 20457 Tolerance Table Pdf Jun 2026

Refers to dimensions affected by tool movement or parting lines. Key Concepts of ISO 20457

Let’s walk through a real-world example to solidify your understanding of the . iso 20457 tolerance table pdf

| 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 | Refers to dimensions affected by tool movement or

standard (which replaced the older DIN 16901) provides a comprehensive system for determining manufacturing tolerances for plastic molded parts. It classifies tolerances into Tolerance Groups (TG) It classifies tolerances into Tolerance Groups (TG) In

In the manufacturing of plastic parts, applying standard metal tolerances (like ISO 2768) is not practical. Plastics behave differently during and after cooling.

| Nominal dimension (mm) | Tolerance grade 1 (fine) | Grade 2 (medium) | Grade 3 (coarse) | Grade 4 (very coarse) | |------------------------|--------------------------|------------------|------------------|------------------------| | 0 – 3 | ±0.05 | ±0.10 | ±0.20 | ±0.40 | | >3 – 6 | ±0.06 | ±0.12 | ±0.24 | ±0.48 | | >6 – 10 | ±0.08 | ±0.15 | ±0.30 | ±0.60 | | >10 – 18 | ±0.10 | ±0.20 | ±0.40 | ±0.80 | | >18 – 30 | ±0.12 | ±0.25 | ±0.50 | ±1.00 | | >30 – 50 | ±0.15 | ±0.30 | ±0.60 | ±1.20 | | >50 – 80 | ±0.20 | ±0.40 | ±0.80 | ±1.60 | | >80 – 120 | ±0.25 | ±0.50 | ±1.00 | ±2.00 | | >120 – 180 | ±0.30 | ±0.60 | ±1.20 | ±2.40 | | >180 – 250 | ±0.40 | ±0.80 | ±1.60 | ±3.20 |

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