Iso 20457 Tolerance Table Pdf May 2026

ISO 20457:2018 is the primary international standard for determining manufacturing tolerances and acceptance conditions for non-porous plastic molded parts. It replaces the older DIN 16742 standard and provides a systematic way to calculate achievable tolerances based on material properties and manufacturing processes. Unlike metal machining standards, ISO 20457 accounts for the unique behavior of plastics, such as mold shrinkage and environmental sensitivity. Key Components of ISO 20457

Technical Summaries: View abbreviated versions or "Note Blocks" for drawings at Super Ingenuity. iso 20457 tolerance table pdf

| 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 | ISO 20457:2018 is the primary international standard for

The Tolcap Rough Guide to Tolerancing Plastic Mouldings - Tol Key Components of ISO 20457 Technical Summaries: View