Din 16742 - Tg5 [top] Site
Assemblies requiring tight fits, such as snap-fits, connector housings, and sensor housings.
Achieving TG5 often requires tighter manufacturing tolerances on the injection mold itself, which can increase tooling costs compared to TG6 or TG7. 3. Dimensional Distinctions
The selection of TG5 is highly strategic. It is the default choice for functional components that require a degree of reliability and fitment but do not fall into the category of high-precision instrumentation.
Compare specific TG5 tolerance ranges for small vs. large parts. Explain how material fillers influence these tolerances. Show examples of dimensioning a part to these standards.
Features formed across the mold parting line, by slides, or by lifters require wider tolerances due to clamping mechanism shifts. Typical Nominal Dimension Breakdown for TG5
: Inhomogeneous cooling rates between thick and thin walls introduce internal stresses, warping, and sink marks.
: Do not specify TG5 alongside an unfilled, high-shrinkage material like low-density polyethylene (LDPE) unless you are prepared for high scrap rates and extensive tool tuning.
: He applied a 0.5-degree draft—the bare minimum—to keep the dimensions within the TG5 window while still allowing for release.
While the exact matrices should be cross-referenced with the official DIN 16742 text, the following values illustrate how a TG5 tolerance window scales based on feature size for standard tool-dependent dimensions: Nominal Dimension Range (mm) Approximate TG5 Tolerance Window (± mm) Up to 3 mm ± 0.05 mm 3 mm to 6 mm ± 0.07 mm 6 mm to 10 mm ± 0.09 mm 10 mm to 18 mm ± 0.11 mm 18 mm to 30 mm ± 0.14 mm 30 mm to 50 mm ± 0.18 mm 50 mm to 80 mm ± 0.23 mm 80 mm to 120 mm ± 0.29 mm
For , the tolerance multiplier is stricter than TG6. A smaller multiplier implies a tighter, more precise tolerance band. Example Comparison (Approximate): 30mm Dimension (TG6): ± 0.15 mm
: Engineers are advised by firms like Pekago Covering Technology to design parts at the "middle" of the tolerance field to allow for material fluctuations.
When citing on a drawing, you are telling the manufacturer that you require a standard of "Accurate Production". To avoid ambiguity, always clearly mark your Acceptance Dimensions and consult with your molder to confirm that your chosen material's shrinkage rate aligns with TG5 capabilities. DIN 16742 - 2013-10
Unlike tolerance standards originally developed for metal parts, DIN 16742 recognises that polymers behave fundamentally differently during processing and in service. Plastics exhibit anisotropic shrinkage, viscoelastic behaviour, and strong dependence on processing parameters such as injection pressure, holding pressure, mould temperature, and melt temperature.
The Deutsches Institut für Normung (DIN) is the German national body that develops and publishes standards for a wide range of products and services. DIN standards are recognized and respected globally for their precision and the role they play in ensuring quality, safety, and efficiency. Among these standards, DIN 16742 emerges as a crucial specification for the manufacturing sector.
The standard defines distinct tolerance groups—TG1 through TG7—each corresponding to the manufacturing precision required. This classification acknowledges that not all plastic parts are created equal; a simple cable clip does not require the same precision as an optical housing or a medical device component. By specifying a tolerance group, manufacturers can select the appropriate molding parameters, materials, and quality control measures.
Dimensions formed within a single solid piece of the mold cavity. These have tighter real-world accuracy because they are not affected by tool movements.
: Structural foam molding, thick-walled parts, or highly semi-crystalline materials susceptible to severe, unpredictable shrinkage. Tool-Fixed vs. Non-Tool-Fixed Dimensions
mm (values vary based on whether the dimension is "tool-specified" or "non-tool-specified"). Tool-Specified vs. Non-Tool-Specified Dimensions
: Shrinkage properties of different polymers (e.g., PP vs. ABS) will affect how easily TG5 is achieved.
Assemblies requiring tight fits, such as snap-fits, connector housings, and sensor housings.
Achieving TG5 often requires tighter manufacturing tolerances on the injection mold itself, which can increase tooling costs compared to TG6 or TG7. 3. Dimensional Distinctions
The selection of TG5 is highly strategic. It is the default choice for functional components that require a degree of reliability and fitment but do not fall into the category of high-precision instrumentation.
Compare specific TG5 tolerance ranges for small vs. large parts. Explain how material fillers influence these tolerances. Show examples of dimensioning a part to these standards.
Features formed across the mold parting line, by slides, or by lifters require wider tolerances due to clamping mechanism shifts. Typical Nominal Dimension Breakdown for TG5
: Inhomogeneous cooling rates between thick and thin walls introduce internal stresses, warping, and sink marks.
: Do not specify TG5 alongside an unfilled, high-shrinkage material like low-density polyethylene (LDPE) unless you are prepared for high scrap rates and extensive tool tuning.
: He applied a 0.5-degree draft—the bare minimum—to keep the dimensions within the TG5 window while still allowing for release.
While the exact matrices should be cross-referenced with the official DIN 16742 text, the following values illustrate how a TG5 tolerance window scales based on feature size for standard tool-dependent dimensions: Nominal Dimension Range (mm) Approximate TG5 Tolerance Window (± mm) Up to 3 mm ± 0.05 mm 3 mm to 6 mm ± 0.07 mm 6 mm to 10 mm ± 0.09 mm 10 mm to 18 mm ± 0.11 mm 18 mm to 30 mm ± 0.14 mm 30 mm to 50 mm ± 0.18 mm 50 mm to 80 mm ± 0.23 mm 80 mm to 120 mm ± 0.29 mm
For , the tolerance multiplier is stricter than TG6. A smaller multiplier implies a tighter, more precise tolerance band. Example Comparison (Approximate): 30mm Dimension (TG6): ± 0.15 mm
: Engineers are advised by firms like Pekago Covering Technology to design parts at the "middle" of the tolerance field to allow for material fluctuations.
When citing on a drawing, you are telling the manufacturer that you require a standard of "Accurate Production". To avoid ambiguity, always clearly mark your Acceptance Dimensions and consult with your molder to confirm that your chosen material's shrinkage rate aligns with TG5 capabilities. DIN 16742 - 2013-10
Unlike tolerance standards originally developed for metal parts, DIN 16742 recognises that polymers behave fundamentally differently during processing and in service. Plastics exhibit anisotropic shrinkage, viscoelastic behaviour, and strong dependence on processing parameters such as injection pressure, holding pressure, mould temperature, and melt temperature.
The Deutsches Institut für Normung (DIN) is the German national body that develops and publishes standards for a wide range of products and services. DIN standards are recognized and respected globally for their precision and the role they play in ensuring quality, safety, and efficiency. Among these standards, DIN 16742 emerges as a crucial specification for the manufacturing sector.
The standard defines distinct tolerance groups—TG1 through TG7—each corresponding to the manufacturing precision required. This classification acknowledges that not all plastic parts are created equal; a simple cable clip does not require the same precision as an optical housing or a medical device component. By specifying a tolerance group, manufacturers can select the appropriate molding parameters, materials, and quality control measures.
Dimensions formed within a single solid piece of the mold cavity. These have tighter real-world accuracy because they are not affected by tool movements.
: Structural foam molding, thick-walled parts, or highly semi-crystalline materials susceptible to severe, unpredictable shrinkage. Tool-Fixed vs. Non-Tool-Fixed Dimensions
mm (values vary based on whether the dimension is "tool-specified" or "non-tool-specified"). Tool-Specified vs. Non-Tool-Specified Dimensions
: Shrinkage properties of different polymers (e.g., PP vs. ABS) will affect how easily TG5 is achieved.
