Iso 20457 Tg5 Repack Jun 2026

| Tolerance Group | Typical Usage | Achievable Tolerance (Medium Parts) | Cost & Complexity | | :--- | :--- | :--- | :--- | | | Precision parts (e.g., gears, medical devices, bearing seats) | ±0.03mm to ±0.07mm | High | | TG5 | Housing parts, general-purpose components | ±0.10mm to ±0.25mm | Moderate | | TG6 | Standard industrial parts (e.g., automotive interior trim, enclosures) | ±0.10mm to ±0.25mm | Low to Moderate | | TG8 | Large cosmetic covers, non-critical surfaces | ±0.40mm to ±0.80mm | Very Low |

of non-porous thermoplastics, thermoplastic elastomers (TPEs), and thermosets.

specifically addresses the characterization and testing protocols for recycled plastics containing fillers and reinforcements , most notably Talc and Glass Fiber (GF) . Iso 20457 Tg5

: Used for broad consumer applications, coarser commercial molding, or high-shrinkage materials.

Mastering Plastic Injection Molding Precision: The Definitive Guide to ISO 20457 Tg5 | Tolerance Group | Typical Usage | Achievable

TG1 - TG3: Ultra-high precision (often reserved for specialized optical or medical components). TG4 - TG6: High precision to "Fine" engineering grades.

While TG6 is cheaper, it may lead to assembly issues if the parts need to snap together or maintain a specific aesthetic gap. TG4 (Precision) TG5 (Standard) TG6 (Coarse) Common Use Small wheels, gears Housings, trim Packaging, simple caps Manufacturing Effort Cost Economical Summary of Key Benefits TG4 (Precision) TG5 (Standard) TG6 (Coarse) Common Use

They were trying to measure the width of a hair using a ruler with teeth the size of bricks.

tolerance group. For context, standard commercial parts often fall into TG6 or TG7, while TG5 is used for tighter technical requirements. Determining the TG

It acts as a middle-ground solution. It avoids the high tooling costs of TG3 while ensuring better quality than a looser TG7 specification. Impact on Manufacturing and Materials

To fully appreciate the role of Tg5, it is helpful to see how it sits within the broader tolerance hierarchy.