DIN ISO 20457 2021-06 PDF

Full title and description

DIN ISO 20457:2021-06 — Plastics moulded parts — Tolerances and acceptance conditions (adoption of ISO 20457:2018); text in German and English. This is the German national adoption (DIN) of the ISO international standard, published as a bilingual (DE/EN) document for use in Germany and internationally by organisations referencing the DIN edition.

Abstract

This standard specifies possible manufacturing tolerances and acceptance conditions for plastic moulded parts. It gives general tolerances (including surface profile tolerances) within a specified datum system, allows use of ISO GPS tools for dimensional and geometrical tolerancing, and addresses common moulding processes (injection, injection-compression, transfer, compression and rotational moulding) for non‑porous thermoplastics, thermoplastic elastomers and thermosets. Surface imperfections such as sink marks, undesired flow structures, roughness and joint lines are not covered.

General information

• Status: Current (DIN adoption of ISO 20457; corrected edition available).
• Publication date: 2021-06 (DIN publication/adoption date).
• Publisher: Deutsches Institut für Normung (DIN) / Beuth (DIN Media edition).
• ICS / categories: 83.140.01 (Plastics engineering / moulded parts).
• Edition / version: DIN adoption (2021-06) of ISO 20457:2018 (Edition 1, 2018).
• Number of pages: 74 pages (DIN bilingual edition). Note: the original ISO 20457:2018 English edition is 28 pages; national adoption editions frequently have additional front matter, national foreword and bilingual text which increases page count.

Scope

Specifies manufacturing tolerances and acceptance criteria for plastic moulded parts and their integral features, using a datum system and ISO GPS tools where appropriate. The standard covers injection moulding, injection-compression moulding, transfer moulding, compression moulding and rotational moulding of non‑porous parts made from thermoplastics, thermoplastic elastomers and thermosets; it may be applied to other plastics processes by agreement between parties. It does not address surface imperfections such as sink marks, undesired flow structures, roughness or joint lines, nor does it replace product‑specific tolerance requirements.

Key topics and requirements

• Definition of general manufacturing tolerances for integral features of plastic moulded parts (dimensional and geometrical).
• Specification of surface profile tolerances within a defined datum system.
• Use of ISO GPS methodology and tools (geometrical tolerancing principles) to define and interpret tolerances.
• Applicability to common moulding processes: injection, injection‑compression, transfer, compression and rotational moulding.
• Clear exclusions and contractual flexibility: surface defects and some surface texture issues are excluded; parties may agree on deviations or additional functional tolerances.
• Acceptance conditions and inspection guidance for conformity assessment of moulded parts (general criteria rather than product‑specific prescriptions).

Typical use and users

Used by product designers, tooling and mould designers, quality engineers, metrology and inspection teams, and manufacturers/suppliers of plastic parts across automotive, consumer goods, electronics, medical devices (where applicable) and industrial components. The standard is a reference for specifying tolerances on drawings and in procurement or quality agreements between OEMs and suppliers.

Related standards

Directly related to ISO 20457:2018 (original international text) and the developing ISO/DIS 20457 (revision/draft). It is used alongside ISO GPS standards for geometrical tolerancing and datums (for example ISO 1101 on geometrical tolerancing and ISO 5459 on datums and datum systems), and may be used together with product‑specific standards that specify tighter or specialised tolerances.

Keywords

Plastics, moulded parts, injection moulding, tolerances, acceptance conditions, ISO GPS, datum system, geometrical tolerancing, inspection, quality, DIN adoption.

FAQ

Q: What is this standard?

A: DIN ISO 20457:2021-06 is the German (DIN) adoption of ISO 20457:2018, the international standard that defines tolerances and acceptance conditions for plastic moulded parts; the DIN edition is a bilingual publication (German/English).

Q: What does it cover?

A: It covers recommended manufacturing tolerances and acceptance conditions for integral features of non‑porous plastic moulded parts, using datum systems and ISO GPS tools; it applies to common moulding processes (injection, injection‑compression, transfer, compression and rotational moulding) and excludes certain surface‑defect criteria.

Q: Who typically uses it?

A: Designers, mould/tool engineers, quality and inspection teams, metrologists, OEMs and suppliers who specify, manufacture or inspect plastic moulded parts. It is commonly referenced in industry sectors that rely on precision plastic components.

Q: Is it current or superseded?

A: The ISO original (ISO 20457:2018) remains the base international edition; the DIN adoption was published in June 2021. ISO has been processing a revision (ISO/DIS 20457) as part of normal review/revision cycles — users should check the latest ISO and national catalogues for any new editions or updates before specifying the standard.

Q: Is it part of a series?

A: It is part of the family of standards addressing plastics and geometrical product specification: ISO 20457 (tolerances for moulded parts) is used together with ISO GPS standards (for example ISO 1101 for geometrical tolerancing and ISO 5459 for datums) and other ISO/TC 61/SC 11 work on plastics tolerancing.

Q: What are the key keywords?

A: Plastics, moulded part tolerances, acceptance conditions, injection moulding, geometrical tolerancing, ISO GPS, datum system, inspection.