When using this standard, a "useful" post or engineering drawing must specify if the dimension is or non-mold-fixed :
All tolerances in DIN 16742 are . If asymmetrical tolerances (e.g., fit dimensions) are required, they must be converted to a symmetrical tolerance field location by formally modifying the nominal dimension to the tolerance mean dimension C: 100-0.6 → 99.7 ± 0.3 .
Parts where dimension stability is crucial for performance and safety.
for vertical surfaces to ensure the part ejects without distorting its dimensions Nominal Design: Always design your CAD parts at the din 16742 - tg5
While draft angles are not strictly a tolerance, they are critical for achieving TG5 reliably.
, so you may see both referenced on modern engineering drawings. specific ±mm values for TG5 across different nominal dimension ranges?
DIN 16742 is designed for original moulding processes with tools closed on all sides, such as injection moulding, injection compression moulding, and compression moulding of non-porous moulded parts. If special process variants are used, an analogous application of the standard is possible after agreement with the moulded part manufacturer. When using this standard, a "useful" post or
: Dimensions affected by the opening/closing of the mold or moving parts (like sliders), which require larger tolerance ranges. Super-Ingenuity Implementation Recommendations
Easiest materials to hit TG5 requirements consistently. Semi-Crystalline High, anisotropic shrinkage ( PP, PE, PA6, POM
Injection moulding is the primary manufacturing method associated with TG5. For prototype and low-volume production, can also achieve TG5 tolerances, with a minimum tolerance of ±0.1 mm and general tolerances of 0.4 – 0.5% of the nominal dimension. for vertical surfaces to ensure the part ejects
Understanding how TG5 relates to other common tolerance specifications is important:
DIN 16742 is a German standard (adopted internationally as ISO 20457) that defines general tolerances for plastic molded parts. Unlike metal parts, which can be specified using standardized fit systems, plastic parts require a unique system due to material behavior like shrinkage, warpage, and moisture absorption.