Dimensions influenced by moving components of the mold, such as the parting line between the core and cavity halves, sliders, lifters, or ejector pins. Because these parts shift slightly during clamping, they require wider tolerances (often shifted up by one tolerance group). 6. How to Implement ISO 20457 on Engineering Drawings
So any PDF that claims to be a universal “ISO 20457 tolerance table” is likely a simplified summary from a textbook or company standard.
Determine the shrinkage factor of your chosen resin (e.g., ABS, PC, PA66). iso 20457 tolerance table pdf
CNC machining accuracy, steel type selection, wear over time, and the integration of moving cores directly impact the tool-dependent ( ) tolerance limits.
Dimensions formed by moving parts of the mold, such as parting lines, slider mechanisms, or core pulls. These require wider tolerances to account for shifting or flexing during the high-pressure injection process. How to Apply ISO 20457 to Your Drawing Dimensions influenced by moving components of the mold,
). For the definitive, legally binding matrix, always consult the official ISO 20457 PDF documentation. Nominal Dimension (mm) 3 to 6 6 to 10 10 to 18 18 to 30 30 to 50 50 to 80 80 to 120 120 to 180 180 to 250 Factors Influencing Plastic Molded Tolerances
The accuracy of the mold cavity design and construction. How to Implement ISO 20457 on Engineering Drawings
A search for "iso 20457 tolerance table pdf" will lead you to sketchy third-party websites offering free downloads. Here is why:
The standard categorizes workpieces into three main classes:
The serves as the definitive international benchmark for specifying dimensional and geometrical tolerances in molded plastic parts . Replacing older localized frameworks like DIN 16901, this standard governs processes like injection molding, compression molding, and rotational molding for non-porous thermoplastics, thermoplastic elastomers, and thermosets.