of TG5 values against other tolerance groups for specific dimension ranges? Design Guide Spuitgieten - Pekago Covering Technology
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To reach the tight requirements of TG5, engineers often use a "Steel Off"
Dimensions formed by a single part of the mold (like a cavity). These are easier to control Super-Ingenuity Non-Mold-Fixed: din 16742 - tg5
The DIN 16742 standard defines nine tolerance groups (TG1 to TG9), with TG1 being the tightest (most accurate) and TG9 the widest (least accurate). The assignment of a part to a specific tolerance group is not arbitrary but is determined through a structured, point-based evaluation of several key factors as defined by the standard.
⚠️ These are general linear tolerances. For functional features (e.g., fits with metal parts), tighter TG3 or TG4 is recommended.
Polycarbonate (PC), Polystyrene (PS), Acrylonitrile Butadiene Styrene (ABS), Acrylic (PMMA). Semi-Crystalline Plastics (Higher Shrinkage) of TG5 values against other tolerance groups for
Medical connectors, high-speed gears; requires low anisotropy.
Variations in nominal wall thickness cause differential cooling. This leads to localized shrinkage variations that easily violate TG5 limits.
. This means production and quality assurance are oriented toward higher dimensional stability than standard "normal" production. Application: It is frequently cited as the standard for Injection Moulding If you share with third parties, their policies apply
Designing to provides an excellent sweet spot for industrial engineering. It yields components with precise, predictable fits—essential for consumer electronics, automotive interiors, and complex mechanical assemblies—while remaining highly viable for high-volume commercial production. By pairing careful material selection with uniform wall designs and robust tool cooling, manufacturers can seamlessly hit the TG5 window, reducing scrap rates and accelerating time-to-market.
DIN 16742 includes basic geometric tolerances at each TG level. For TG5, typical default values (without explicit GD&T callout):
The specification is a powerful tool for global engineering teams. It provides a standardized language that aligns the expectations of the product designer, the toolmaker, and the quality control department. By understanding that TG5 represents precision-level control, and by designing your parts to accommodate the material and tooling constraints dictated by the standard, you can ensure high-yielding, high-quality production runs for complex plastic assemblies.