To hit TG5 tolerances consistently, you must account for these three variables: Mold-Fixed vs. Non-Mold-Fixed Dimensions: Mold-Fixed:
Dictates coarse applications or highly volatile materials.
TG5 is often the default choice for engineering thermoplastics exhibiting low-to-medium shrinkage (typically between 0.5% and 1.5%). Materials like Amorphous ABS, Polycarbonate (PC), and PMMA naturally achieve TG5 parameters without specialized molding techniques. Semi-crystalline resins like Polyamide (PA6/PA66) or Polypropylene (PP) can also meet TG5 criteria when properly designed with uniform wall thicknesses to suppress differential warpage. Tool Design Realities
production level. It is tighter than the standard TG6 but less extreme than the tool-room limits of TG3 or TG4. Application din 16742 - tg5
: It is often specified for "hard" plastic components or multi-component parts where a more accurate fit is needed (e.g., snap-fits or bearing housings). Cost vs. Accuracy
These dimensions are formed entirely within a single, solid block or moving segment of the mold tool. Because no mechanical shifting or opening occurs across this dimension during the injection cycle, variables are limited primarily to material shrinkage. Consequently, . Non-Tool-Specific Dimensions (NW)
The standard represents a critical benchmark for achieving strict, predictable precision in plastic injection molding. Unlike metals, plastics undergo complex thermodynamic changes during processing, making standardization challenging. This article breaks down how engineers use the DIN 16742 TG5 standard to align manufacturing capabilities with product design requirements. What is DIN 16742? To hit TG5 tolerances consistently, you must account
Initially specified TG5 for all dimensions. After mold flow analysis, only the pin grid array (PGA) zones were mapped to TG5. The outer shell was relaxed to TG4.
Tolerances in DIN 16742 are not fixed flat numbers; they scale relative to the of the molded part. As the physical size of the part increases, the allowed tolerance zone expands.
DIN 16742 TG5 strikes an ideal balance between high-end dimensional precision and manufacturing viability. It challenges manufacturers to optimize their processes but rewards them with highly functional, reliable, and perfectly matching components. By understanding the interplay between polymer behavior, tool construction, and the nominal dimension scaling of TG5, engineering teams can confidently design next-generation plastic products. Materials like Amorphous ABS, Polycarbonate (PC), and PMMA
is a critical German standard that defines tolerances and dimensions for molded plastic parts. In the field of injection molding and polymer engineering, achieving exact dimensions is challenging due to material shrinkage, warpage, and process variations. DIN 16742 provides a systematic framework for designers and manufacturers to agree on acceptable dimensional deviations.
For dimensions on inclined surfaces (due to draft), to ensure consistent two-point measurements. This prevents disputes about where exactly on the draft surface the measurement should be taken.