Pdf !full! - Iso 20457 Tolerance Table

While the full PDF document outlines extensive data across different nominal dimensions, the table below provides a simplified overview of standard dimensional tolerances (± in mm) for common size ranges across typical Tolerance Groups. Nominal Dimension (mm) TG3 (Precision) TG4 (Fine) TG5 (Medium) TG6 (Standard) TG7 (Coarse) 1 to 3 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

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Specifying functionally required tolerances based on polymer behavior. Toolmakers Agreeing on shrinkage compensation and tool contour limits. Quality Engineers Applying acceptance criteria in production control plans. Tolerance Group (TG) table breakdown for a particular nominal dimension range? TOLERANCES

Tight, precision tolerances. These require highly optimized tool designs, high-end materials, and strict process control (often resulting in higher production costs). iso 20457 tolerance table pdf

Standard for non-critical consumer products or packaging. ISO 20457 Tolerance Table Overview

You can purchase the official standard from national bodies:

| Nominal size (mm) | PT3 (Fine) | PT5 (Medium) | PT7 (Coarse) | |------------------|------------|--------------|---------------| | up to 10 | ±0.10 | ±0.25 | ±0.50 | | 10 – 25 | ±0.15 | ±0.35 | ±0.70 | | 25 – 63 | ±0.20 | ±0.45 | ±0.90 | | 63 – 100 | ±0.30 | ±0.60 | ±1.20 | | 100 – 160 | ±0.40 | ±0.80 | ±1.60 | While the full PDF document outlines extensive data

Because ISO standards are copyrighted intellectual property, the official, fully detailed must be purchased through authorized channels. Legitimate sources include: The official ISO Store (iso.org)

These tolerances apply to dimensions that are influenced by factors outside of the mold cavity itself.

For a maintenance engineer rebuilding a centrifugal pump, ISO 20457 serves as a checklist. When measuring a worn shaft, the engineer compares the current dimension against the ISO 20457 tolerance. If the shaft is worn beyond the allowable deviation, the standard confirms that the part must be replaced or repaired. This removes the guesswork from maintenance decisions. If you share with third parties, their policies apply

Identify whether the feature is a molding-dimension (formed by a single mold component) or a closure-dimension (affected by moving mold parts like slides, lifters, or the parting line). Closure dimensions require wider tolerances.

The standard covers both thermoplastic and thermosetting materials. It ensures that designers, engineers, and molders share a common language regarding what variations are technically realistic and economically viable. ISO 20457 Plastic Tolerance Series (NW, W)

Plastics absorb moisture and have a high coefficient of thermal expansion, causing parts to expand or contract based on ambient air conditions.

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Ranges from TG1 (extremely precise) to TG9 (very coarse). TG6 is the typical standard for injection molding.