oSIST prEN ISO 8674:2022

Fasteners - Hexagon high nuts (style 2), with fine pitch thread (ISO/DIS 8674:2022)

Mechanische Verbindungselemente – Hohe Sechskantmuttern (Typ 2), mit Feingewinde (ISO/DIS 8674:2022)

Diese Internationale Norm legt Eigenschaften von Sechskantmuttern (Typ 2) mit Feingewinde mit Nenndurchmessern von 8 mm bis 39 mm fest. Für die Gewindenenndurchmesser D ≤ 16 mm gilt Produktklasse A und für die Gewindenenndurchmesser D > 16 mm Produktklasse B.

Fixations - Écrous hexagonaux hauts (style 2), à pas fin (ISO/DIS 8674:2022)

Vezni elementi - Šestrobe visoke matice (tip 2) z drobnim metrskim navojem (ISO/DIS 8674:2022)

General Information

• Status: Not Published
• Public Enquiry End Date: 11-Jul-2022
• ICS: 21.040.10 - Metric screw threads
• ICS: 21.060.20 - Nuts
• Technical Committee: ISEL - Mechanical elements
• Current Stage: 98 - Abandoned project (Adopted Project)
• Start Date: 28-Mar-2023
• Due Date: 02-Apr-2023
• Completion Date: 28-Mar-2023
• Ref Project: prEN ISO 8674 - Hexagon high nuts (style 2), with fine pitch thread - Product grades A and B (ISO/DIS 8674:2016)

Relations

• Revised: SIST EN ISO 8674:2014 - Hexagon nuts, style 2, with metric fine pitch thread - Product grades A and B (ISO 8674:2012)
• Effective Date: 18-Jan-2023
• Revised: SIST EN ISO 8674:2014 - Hexagon nuts, style 2, with metric fine pitch thread - Product grades A and B (ISO 8674:2012)
• Effective Date: 04-Nov-2020

Overview

The oSIST prEN ISO 8674:2022:2022 standard specifies the technical requirements for hexagon high nuts (style 2) featuring fine pitch metric threads, ranging in sizes from 8 mm to 39 mm. This standard applies to nuts made of both steel and stainless steel, classified into product grades A and B. Hexagon high nuts are essential fasteners used in mechanical assemblies where high-strength, reliable fastening with fine thread pitch is necessary. The standard defines dimensions, material properties, thread tolerances, marking, labelling, and designation rules to ensure interoperability and quality consistency across industries.

Key Topics

• Dimensions and Tolerances:
  Detailed dimensional requirements for hexagon high nuts are provided, including nominal sizes, height, thread specifications, and optional washer-face dimensions. Thread tolerances comply with ISO 965-1, ensuring precision in fine pitch metric threads.

• Materials and Grades:
  The standard covers steel nuts (quenched and tempered according to ISO 898-2) and stainless steel nuts of specified grades (including A2, A4, D4, D6). Material selection depends on application-specific requirements such as corrosion resistance and mechanical properties.

• Product Grades:
  Two product grades are defined:

  • Grade A for nut sizes up to 16 mm
  • Grade B for sizes above 16 mm
    These grades influence mechanical performance expectations.

• Marking and Labelling:
  Nuts must be marked on the product surface and labelled on packaging as per ISO 898-2 for steel and ISO 3506-2 for stainless steel. Marking includes property class symbols, material grade, and manufacturer's identification for traceability.

• Designation System:
  Utilizes ISO 8991 rules for clear and consistent part identification, specifying thread size, pitch, material property class, product grade, and finish/coating conditions.

• Coating and Surface Finish:
  Specifies acceptance of electroplated coatings as per ISO 4042 and zinc flake coatings in line with ISO 10683. Surface integrity standards (ISO 6157-2) and acceptance inspection (ISO 3269) ensure quality control.

Applications

Hexagon high nuts with fine pitch threads are commonly used in industries demanding high precision fastening under critical conditions such as:

• Automotive assembly requiring secure and vibration-resistant fastenings
• Aerospace engineering where precise torque and material performance is essential
• Construction machinery and heavy equipment manufacturing
• Industrial machinery and mechanical engineering where dimensional consistency and mechanical integrity are paramount
• Environments requiring corrosion-resistant fasteners, especially using stainless steel grades

The fine pitch thread enhances load distribution and fatigue resistance, making these nuts suitable in applications with dynamic loads or limited space.

Related Standards

• ISO 898-2: Mechanical properties of carbon and alloy steel nuts with specified property classes.
• ISO 3506-2: Mechanical properties of corrosion-resistant stainless steel nuts.
• ISO 965-1: General purpose metric screw threads - Tolerances.
• ISO 8991: Designation system for fasteners (bolts, nuts, screws).
• ISO 4759-1: Tolerances for fasteners product grades A, B, and C.
• ISO 3269: Acceptance inspection for fasteners.
• ISO 4042: Electroplated coating systems for fasteners.
• ISO 10683: Non-electrolytically applied zinc flake coating systems.
• ISO 6157-2: Surface discontinuities requirements for nuts.

These complementary standards ensure fasteners meet performance, quality, and safety expectations, facilitating global interoperability and uniform manufacturing practices.

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Keywords: hexagon high nuts, fine pitch thread, metric fasteners, product grade A, product grade B, steel nuts, stainless steel nuts, ISO 8674, fastener standards, thread tolerances, marking and labelling, mechanical properties, coating systems, industrial fasteners.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2022
Vezni elementi - Šestrobe visoke matice (tip 2) z drobnim metrskim navojem
(ISO/DIS 8674:2022)
Fasteners - Hexagon high nuts (style 2), with fine pitch thread (ISO/DIS 8674:2022)
Mechanische Verbindungselemente – Hohe Sechskantmuttern (Typ 2), mit Feingewinde
(ISO/DIS 8674:2022)
Fixations - Écrous hexagonaux hauts (style 2), à pas fin (ISO/DIS 8674:2022)
Ta slovenski standard je istoveten z: prEN ISO 8674
ICS:
21.040.10 Metrski navoji Metric screw threads
21.060.20 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT INTERNATIONAL STANDARD
ISO/DIS 8674
ISO/TC 2/SC 12 Secretariat: DIN
Voting begins on: Voting terminates on:
2022-04-20 2022-07-13
Fasteners — Hexagon high nuts (style 2), with fine pitch
thread
ICS: 21.060.20
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 8674:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022

ISO/DIS 8674:2022(E)
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested 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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Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO/DIS 8674:2022(E)
Contents Page
Foreword .iv
1  Scope . 1
2  Normative references . 1
3  Terms and definitions . 1
4 Dimensions .2
5  Requirements and reference International Standards . 3
6 Marking and labelling . 4
6.1 Marking on product . . 4
6.2 Labelling on package . 5
7 Designation . 5
Bibliography . 6
iii
ISO/DIS 8674:2022(E)
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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO's adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 2, Fasteners, Subcommittee SC 12, Fasteners
with metric internal thread.
This fifth edition cancels and replaces the fourth edition (ISO 8674:2012).
The main changes compared to the previous edition are as follows:
— M18×2, M22×2 and M39×3 have been added;
— d has been specified with two decimal places;
a,max
— for steel nuts, quenching and tempering condition has been specified in accordance with ISO 898-2;
— stainless steel nuts have been added;
— specifications for marking and labelling have been added as Clause 6.
Any feedback or questions on this document should be directed to the user's national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
DRAFT INTERNATIONAL STANDARD ISO/DIS 8674:2022(E)
Fasteners — Hexagon high nuts (style 2), with fine pitch
thread
1  Scope
This document specifies the characteristics of hexagon high nuts (style 2), in steel and stainless steel,
with metric fine pitch thread 8 mm to 39 mm, and with product grades A and B.
If in certain cases other specifications are requested, property classes and stainless steel grades can be
selected from ISO 898-2 or ISO 3506-2.
2  Normative references
The following documents are referred to in the text in such a
...