ISO 10663:2012

Hexagon nuts with flange, style 2 - Fine pitch thread

ISO 10663:2012 specifies the characteristics of hexagon nuts with flange (style 2), and metric fine pitch thread with nominal thread diameters, D, from 8 mm to 20 mm, in product grade A for D less than or equal to 16 mm and product grade B for D greater than 16 mm.

Écrous hexagonaux à embase cylindro-tronconique, style 2 — Filetage à pas fin

General Information

• Status: Published
• Publication Date: 16-Aug-2012
• ICS: 21.060.20 - Nuts
• Technical Committee: ISO/TC 2/SC 12 - Fasteners with metric internal thread
• Drafting Committee: ISO/TC 2/SC 12 - Fasteners with metric internal thread
• Current Stage: 9093 - International Standard confirmed
• Start Date: 01-Jul-2022
• Completion Date: 13-Dec-2025

Relations

• Revises: ISO 10663:1999 - Hexagon nuts with flange - Fine pitch thread
• Effective Date: 16-Feb-2012

Overview

ISO 10663:2012 is an international standard that specifies the characteristics of hexagon nuts with flange, style 2, featuring fine pitch metric threads with nominal thread diameters ranging from 8 mm to 20 mm. The standard defines dimensions, mechanical properties, and testing methods essential to ensuring compatibility and performance in various applications. It categorizes product grades as Grade A for diameters up to 16 mm and Grade B for diameters above 16 mm.

This standard supports manufacturing quality control and ensures interchangeability across industries that use these fasteners in precision assemblies. It is applicable to fasteners requiring enhanced thread engagement and load distribution provided by flange nuts with fine pitch threads.

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Key Topics

• Scope and Applicability
  ISO 10663:2012 focuses on hexagon nuts with flange (style 2) suitable for fine pitch threads with diameters between 8 mm and 20 mm. It addresses product grades, dimensions, mechanical properties, and gauging methods.

• Dimensions and Tolerances
  The standard provides specific dimensional information including thread pitch, flange thickness, nut height, and wrenching metrics. Key dimensions such as:

  • Flange diameter and thickness
  • Wrenching height and width across flats
  • Thread tolerances adhering to ISO 261, ISO 724, ISO 965-2
    These requirements ensure precise fit and compatibility.

• Material and Mechanical Properties
  Steel and stainless-steel materials are covered, referencing ISO 898-2 for mechanical strength requirements and ISO 3506-2 for corrosion-resistant stainless steel nuts. Property classes 8, 10, and 12 are applicable for steel, with limitations on certain grades for larger diameters.

• Quality Assurance and Gauging Methods
  ISO 10663:2012 details recommended gauging procedures using plain ring gauges to verify hexagon height, flange thickness, and corner fill-critical for ensuring dimensional adherence and functional reliability.

• Referenced Standards
  The standard cross-references several ISO norms essential for fastener quality and compatibility:

  • ISO 261, ISO 724 (thread dimensions)
  • ISO 898-2 (mechanical properties)
  • ISO 965-2 (tolerance limits)
  • ISO 4759-1 (tolerance for product grades)
  • ISO 3269 (acceptance inspection)
  • ISO 4042 and ISO 10683 (coating specifications)

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Applications

Hexagon nuts with flange style 2 and fine pitch threads specified by ISO 10663:2012 are widely used in precision engineering and mechanical assemblies requiring reliable high-strength fastening with controlled thread engagement. Typical applications include:

• Automotive and Aerospace Components
  Fine pitch threads allow for finer adjustments and higher clamping force, critical in safety-sensitive environments.

• Machinery and Equipment Manufacturing
  Ensures secure fastening in high-vibration or load-intensive scenarios due to the flange's load distribution properties.

• Electrical and Electronic Assemblies
  Where precise thread fit and minimal loosening under thermal cycling are required.

• Corrosion-Resistant Fastening Needs
  When stainless-steel grades are specified, these nuts are suitable for harsh or corrosive environments.

The flange design minimizes the need for separate washers and reduces assembly time, enhancing overall efficiency.

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Related Standards

ISO 10663:2012 closely interacts with the following international standards relevant to fastener design, manufacture, and testing:

• ISO 261 - Metric screw thread general plan
• ISO 724 - Basic dimensions for metric screw threads
• ISO 898-2 - Mechanical properties of nuts, including proof load values
• ISO 965-2 - Limits and fits for metric screw threads
• ISO 3506-2 - Mechanical properties of stainless-steel fasteners
• ISO 4759-1 - Tolerances for fasteners with different product grades
• ISO 3269 - Acceptance inspection guidelines
• ISO 4042 - Electroplated coatings specifications
• ISO 10683 - Non-electrolytically applied zinc flake coatings
• ISO 6157-2 - Surface discontinuities and quality control

This interconnected framework ensures comprehensive guidance for manufacturers and users of flange hexagon nuts with fine pitch threads, maintaining consistency and reliability worldwide.

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ISO 10663:2012 is essential for manufacturers, quality engineers, and design professionals seeking standardized specifications for high-quality hexagon flange nuts-a critical fastener type used in demanding industrial applications. Accurate adherence to this standard ensures safety, interchangeability, and lasting performance in fine pitch thread assemblies.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 10663
Second edition
2012-09-01
Hexagon nuts with flange, style 2 —
Fine pitch thread
Écrous hexagonaux à embase cylindro-tronconique, style 2 —
Filetage à pas fin
Reference number
©
ISO 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO’s
member body in the country of the requester.
ISO copyright office
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Tel. + 41 22 749 01 11
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Published in Switzerland
ii © ISO 2012 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Dimensions . 1
4 Requirements and reference International Standards . 4
5 Designation . 4
Annex A (informative) Gauging of hexagon nuts with flange . 5
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 10663 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 12, Fasteners with
metric internal thread.
This second edition cancels and replaces the first edition (ISO 10663:1999), of which it constitutes a minor revision.
iv © ISO 2012 – All rights reserved

INTERNATIONAL STANDARD ISO 10663:2012(E)
Hexagon nuts with flange, style 2 — Fine pitch thread
1 Scope
This International Standard specifies the characteristics of hexagon nuts with flange (style 2), and metric fine
pitch thread with nominal thread diameters, D, from 8 mm to 20 mm, in product grade A for D ≤ 16 mm and
product grade B for D > 16 mm.
If, in special cases, specifications other than those listed in this International Standard are required, they can be
selected from existing International Standards, for example ISO 261, ISO 724, ISO 898-2, ISO 965-2 and ISO 3506 2.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced document
(including any amendments) applies.
ISO 225, Fasteners — Bolts, screws, studs and nuts — Symbols and descriptions of dimensions
ISO 261, ISO general purpose metric screw threads — General plan
ISO 724, ISO general-purpose metric screw threads — Basic dimensions
ISO 898-2, Mechanical properties of fasteners — Part 2: Nuts with specified proof load values — Coarse
thread and fine pitch thread
ISO 965-2, ISO general purpose metric screw threads — Tolerances — Part 2: Limits of sizes for general
purpose external and internal screw threads
...