IEC 63182-9:2026

• Abstract:

  IEC 63182-9:2026 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of ellipse-cores made of metallic magnetic powder, and gives guidelines on allowable limits of surface irregularities applicable to ellipse-cores.; This document is a specification useful in the negotiations between magnetic powder core suppliers and users about surface irregularities.; The use of "derived" standards which give more detailed specifications of component parts while still permitting compliance with this document is discussed in Annex A.

• Status: Published
• Publication Date: 08-Oct-2026
• ICS: 29.100.10 - Magnetic components
• Technical Committee: TC 51 - Magnetic components, ferrite and magnetic powder materials
• Drafting Committee: WG 1 - TC 51/WG 1
• Current Stage: PPUB - Publication issued
• Start Date: 09-Oct-2026
• Completion Date: 06-Nov-2026

IEC 63182-9:2026 is an International Electrotechnical Commission (IEC) standard for magnetic powder cores. It specifies the dimensions that matter for mechanical interchangeability of a preferred range of ellipse-cores made of metallic magnetic powder, and it gives guidelines for allowable surface irregularities. It is written for suppliers and users who need a common basis for drawings, inspection, and acceptance discussions.

What does IEC 63182-9:2026 specify?

IEC 63182-9:2026 covers ellipse-cores and the dimensional and visual features that affect fit and interchangeability. The main text is organized into scope, normative references, terms and definitions, primary dimensions, and limits of surface irregularities, with one informative annex on derived standards.

Annex	What it covers
Annex A	Derived standards and how more detailed local or national specifications can remain compatible with this primary standard

The scope is limited to a preferred range of ellipse-cores made of metallic magnetic powder. The document also positions itself as a negotiation aid for surface irregularities, so it is meant to support agreement between the supplier and the user, not only internal design work.

What are the key requirements of IEC 63182-9:2026?

IEC 63182-9:2026 focuses on two things: the core dimensions needed for interchangeability, and the limits for visible surface defects. In practice, these are the dimensions and inspection rules that determine whether two parts can be treated as compatible.

• Clause 4.1 says compliance with the listed primary dimensions supports mechanical interchangeability of complete assemblies. For users, this means the core must fit the intended assembly without extra adaptation.
• Clause 4.2 defines the ellipse-core nomenclature: A is the long axis, B the short axis, and C the height. This shared naming matters for drawings, purchasing data, and inspection reports.
• Clause 4.3 and Table 1 give preferred size designations and the dimensional limits for ellipse-cores, and they also provide tolerance ranges for new designs. That helps designers and buyers work from a controlled family of sizes instead of inventing private dimensions.
• Clause 5.3 sets limits for chips and ragged edges, including rules for the minimum visible chip area, the cumulative chip area, and tighter control on the mating surface. In practice, this is what inspectors use when judging whether edge damage is acceptable.
• Clause 5.4 and Table 2 define crack limits by location. Some side-surface cracking is allowed within limits, while cracks on the mating surface, vertically across side and mating surfaces, or reaching an end are not allowed.
• Clause 5.5 limits flash height, and Clause 5.6 limits rust by surface area while prohibiting rust on the mating surface. These limits matter because excess flash or corrosion can interfere with fit and long-term usability.
• Clause 5.7 leaves discoloration generally without a fixed limit, unless manufacturer and customer agree a limit sample. This gives parties a practical way to settle borderline appearance questions.
• Annex A explains derived standards. It allows more detailed local or national specifications, but they should not exclude other ellipse-cores that still meet this primary standard and remain functionally interchangeable.

What terms does IEC 63182-9:2026 define?

IEC 63182-9:2026 uses the terms and definitions from IEC 63182-1, so the shared vocabulary comes from the general part of the series. The following terms are central to this part:

• Ellipse-core - A magnetic powder core with a long axis, a short axis, and a height, and with curved ends formed by semicircles.
• Primary dimensions - The main dimensions that determine whether complete assemblies remain mechanically interchangeable.
• Mating surface - The surface that must fit properly against another part, so defect limits are stricter there.
• Surface irregularities - Visible defects such as chips, ragged edges, cracks, flash, rust, and discoloration.
• Derived standards - More detailed local or national standards that add detail while staying compatible with this primary standard.

Who uses IEC 63182-9:2026?

IEC 63182-9:2026 is used by magnetic powder core manufacturers, their customers, and the engineers and quality staff who specify or inspect ellipse-cores. It is also useful for procurement teams that need a clear basis for acceptance criteria.

In practice, users apply it when designing cores, checking dimensional interchangeability, inspecting surface condition, and negotiating what level of irregularity is acceptable. It is especially relevant where a supplier and customer need the same language for fit, appearance, and allowable defects.

Which standards are used with IEC 63182-9:2026?

IEC 63182-1 is the normative reference used with IEC 63182-9:2026. It provides the general specifications for the series, the shared terms and definitions, and the visual inspection references used for area and length assessment.

What does the IEC 63182-9:2026 document contain?

IEC 63182-9:2026 contains a nomenclature figure for ellipse-cores, a dimension figure, and a dimension table for the preferred size range. It also includes figures that show examples of surface irregularities and the locations used to judge chips, ragged edges, cracks, flash, and rust.

The document gives a crack-limit table and text rules for chips, ragged edges, flash, rust, and discoloration. Annex A explains how derived standards can add detail for everyday use while preserving compatibility with the primary dimensions in the main body.

IEC 63182-9 ®
Edition 1.0 2026-10
INTERNATIONAL
STANDARD
Magnetic powder cores - Guidelines on dimensions and the limits of surface
irregularities -
Part 9: Ellipse-cores
ICS 29.100.10  ISBN 978-2-8327-1548-2

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CONTENTS
FOREWORD . 2
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Primary dimensions . 4
4.1 General . 4
4.2 Nomenclature for the ellipse-cores . 4
4.3 Dimensions of ellipse-cores . 5
5 Limits of surface irregularities . 5
5.1 General . 5
5.2 Examples of surface irregularities . 6
5.3 Chips and ragged edges . 6
5.3.1 General . 6
5.3.2 Chips . 6
5.3.3 Ragged edges . 6
5.4 Cracks . 6
5.5 Flash . 7
5.6 Rust . 7
5.7 Discoloration . 8
Annex A (informative) Derived standards . 9

Figure 1 – Nomenclature for ellipse-cores . 4
Figure 2 – Dimensions of ellipse-cores . 5
Figure 3 – Examples of surface irregularities . 6
Figure 4 – Chips and ragged edges location for ellipse-cores . 6
Figure 5 – Cracks and flash location for ellipse-cores . 7
Figure 6 – Rust locations for ellipse-cores . 8

Table 1 – Dimensions of ellipse-cores . 5
Table 2 – Limits for cracks . 7

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Magnetic powder cores -
Guidelines on dimensions and the limits of surface irregularities -
Part 9: Ellipse-cores
FOREWORD
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