Iso 20457 Tolerance Table Pdf (PC RECOMMENDED)

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.

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.

Ranges (e.g., 0-30 mm, 30-100 mm) determine the base allowance.

Find the size row of your feature (e.g., 1–3mm, 10–18mm, 50–80mm). iso 20457 tolerance table pdf

A practical summary of the TG6 group values used for injection molding is available through technical resources like OKW Tolerances ISO Official Standard: The full official text and thumbnails for ISO 20457:2018 are available on the ISO Online Browsing Platform Templates & Snippets:

The standard provides tolerance tables categorized by the and the Material Group .

for part sizes based on manufacturing effort and tooling. For multi-component molded parts (e

mm, but only for specifically designated critical-to-quality (CTQ) features. Large Parts:

View abbreviated versions or "Note Blocks" for drawings at Super Ingenuity .

which includes the first few pages and Table 8 (General Tolerances). Detailed Overviews Ranges (e

In mold design, the tolerance of mold molding dimensions should be controlled at . Precision molds adopt a smaller proportion (e.g., 1/5) to reserve margins for shrinkage fluctuation, mold wear, and process changes.

: Tighter groups (TG1–TG3) are rarely used as they significantly increase mold costs and scrap rates.