ISO 20457 is an indispensable tool for anyone involved in the design, molding, or sourcing of plastic parts. By using its tolerance tables and systematic approach, you can avoid costly rework, ensure proper assembly, and achieve reliable quality. The shift from experience-based guesswork to a structured system like ISO 20457 is a foundational step in professionalizing plastic parts engineering.
While DIN 16901 is still referenced for legacy parts, .
: Tolerances are assigned based on the nominal dimension of the part (e.g., < 1mm, 1–6mm, 6–30mm, etc.). Material Influence
To obtain the verified, complete PDF with all technical annexes, material matrices, and advanced geometric tolerance rules, you can purchase it directly from official standard bodies: iso 20457 tolerance table pdf
The standard helps engineers and manufacturers align on realistic dimensional expectations, preventing the over-specification of tight tolerances that unnecessarily drive up tooling and production costs. 2. Key Factors Determining Plastic Tolerances
The global manufacturing industry relies heavily on standardized tolerances to ensure components fit together perfectly. For plastic molded parts, is the definitive international standard governing these dimensions.
It includes specifications for surface profiles, angular dimensions, and tool offsets (parting lines). OKW Gehäusesysteme Reference Documents & Tables ISO 20457 is an indispensable tool for anyone
These represent standard production capabilities for typical commercial plastic parts.
Several industry sources confirm these general assignments. ISO 20457 TG4 is typically applied for precision injection molded parts such as gears, TG5 for housing parts, and TG6 for packaging components. In the automotive industry, critical components typically require TG4 or higher, with deviations measured in micrometers.
Searching for an typically means you want immediate access to these numerical values without purchasing the full 30-page document. However, understanding the logic behind the table is essential before applying any numbers. While DIN 16901 is still referenced for legacy parts,
Stop fighting shrinkage. Embrace ISO 20457.
Let’s walk through a real-world example to solidify your understanding of the .
Failing to account for material shrinkage leads to unrealistic tolerances. A tolerance that is achievable in ABS (low shrinkage) may be impossible in unfilled nylon (high shrinkage). Always reference the appropriate shrinkage group when specifying tolerances.
Used for Critical-to-Quality (CTQ) dimensions, such as snap-fits or bearing housings, though it requires more expensive tooling and process control.
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