Extra Quality | Iso 20457 Tolerance Table Pdf

Do not default your engineering drawings to TG2 or TG3 unless absolutely necessary. Tightening tolerances exponentially increases mold manufacturing costs and cycle times.

For multi-component molded parts (e.g., overmolded or two-shot components), the tolerance grade must be determined for each material separately and specified as distinct general tolerances. For example, a hard component may be specified to TG5 while a soft component (elastomer) is specified to TG7.

For parts requiring extremely tight tolerances, often involving higher production costs and surcharges. Achievable General Tolerances iso 20457 tolerance table pdf

A critical distinction in ISO 20457 is the classification of dimensions as either:

To help find the exact values for your specific project, tell me: Do not default your engineering drawings to TG2

ISO 20457 (and its German equivalent DIN 16742) is the definitive global standard for manufacturing tolerances and acceptance conditions of plastic molded parts

Understanding ISO 20457: The Ultimate Guide to Plastic Molded Part Tolerances For example, a hard component may be specified

Prices typically range from approximately CHF 118 to CHF 200 depending on the format (PDF or hardcopy) and your regional standards body.

for accurate calculations.

In practice, ISO 20457 defines based on:

Keep a legitimate copy of ISO 20457:2018 on your digital shelf, and you will never again guess whether a "±0.5mm" is appropriate for a 2-meter-long part.