Aerospace - Bolts, normal bihexagonal head, normal shank, short or medium length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1 100 MPa - Dimensions

This document specifies the dimensions of normal bihexagonal head bolts, with close or large tolerance normal shank and short or medium length MJ threads, in metallic material, coated or uncoated, with strength classes less than or equal to 1 100 MPa. This document is applicable to the compilation of aerospace product standards.

Aéronautique et espace — Vis à tête bihexagonale normale, avec tige normale et filetages MJ courts ou de longueur moyenne, en matériau métallique, revêtues ou non revêtues, des classes de résistance inférieures ou égales à 1 100 MPa — Dimensions

General Information

Status
Published
Publication Date
29-Mar-2021
Current Stage
6060 - International Standard published
Start Date
30-Mar-2021
Due Date
20-Jan-2022
Completion Date
30-Mar-2021

Relations

Effective Date
23-Apr-2020

Overview

ISO 3185:2021 is a crucial international standard that specifies the dimensions and tolerances for aerospace bolts featuring a normal bihexagonal head, normal shank, and short or medium length MJ threads. Applicable to metallic materials, both coated and uncoated, this standard covers bolts with strength classes up to 1,100 MPa. Developed by ISO/TC 20/SC 4 (Aerospace fastener systems), the third edition of this standard updates previous dimensional specifications to meet the stringent requirements of aerospace product manufacturing and assembly.

This standard plays a key role in ensuring the interchangeability, safety, and reliability of aerospace fasteners for aircraft and spacecraft applications. It mandates precise geometric, thread, and head dimensions to support quality control and design consistency across the aerospace industry.

Key Topics

  • Bolt Configuration: Defines dimensions of normal bihexagonal head bolts, with close or large tolerance normal shank, ensuring mechanical compatibility.
  • Thread Specifications: Details MJ (metric fine) thread types in short or medium lengths, conforming with ISO 5855-2 for limit dimensions.
  • Material and Coating: Applies to bolts of metallic materials which may be coated or uncoated; tolerances account for coating thickness, especially for heat cured organic matrix coatings.
  • Strength Classification: Limited to strength classes less than or equal to 1,100 MPa, ensuring bolt performance in aerospace environments.
  • Dimensional Tolerances: Incorporates size and tolerance classes as per ISO 286-2, ensuring precision manufacturing.
  • Wrenching Configuration: References wrenching dimensions and positions aligned with ISO 4095, facilitating tool compatibility.
  • Inspection and Quality: Tolerances of form and position adhere to ISO 7913, guaranteeing consistent bolt geometry and thread accuracy.

Applications

ISO 3185:2021 is essential for stakeholders in aerospace manufacturing and engineering, particularly in:

  • Aircraft assembly and maintenance: Ensuring fasteners fit precisely and maintain structural integrity under high stress and vibration.
  • Space vehicle component fabrication: Offering reliability in extreme conditions through standardized bolt dimensions and strengths.
  • Aerospace fastener production: Guiding manufacturers on dimensional requirements for bolts to meet aerospace specifications.
  • Quality assurance and testing: Providing measurable parameters for inspection and conformity assessment.
  • Supplier and procurement management: Enabling consistent communication of technical requirements between aerospace companies and suppliers worldwide.

Using ISO 3185 ensures compatibility across aerospace products, reducing risks related to fastener failure and improving system safety.

Related Standards

To effectively implement ISO 3185:2021, reference to the following standards is recommended:

  • ISO 5855-2: Aerospace MJ threads - Limit dimensions for bolts and nuts.
  • ISO 4095: Aerospace bihexagonal drives - Wrenching configuration - Metric series.
  • ISO 7913: Aerospace bolts and screws - Tolerances of form and position.
  • ISO 286-2: Geometrical product specifications (GPS) - Tolerances on linear sizes.
  • ISO 3353-1: Aerospace lead and runout threads - Rolled external threads.

These complementary standards provide detailed requirements for thread geometry, shape, and tolerance classes, ensuring holistic standardization of aerospace fastener systems.


By adhering to ISO 3185:2021, aerospace engineers and manufacturers achieve high precision, reliability, and safety in bolt design and production-critical for the demanding requirements of today’s aviation and space exploration industries.

Standard

ISO 3185:2021 - Aerospace — Bolts, normal bihexagonal head, normal shank, short or medium length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1 100 MPa — Dimensions Released:3/30/2021

English language
4 pages
sale 15% off
Preview
sale 15% off
Preview

Frequently Asked Questions

ISO 3185:2021 is a standard published by the International Organization for Standardization (ISO). Its full title is "Aerospace - Bolts, normal bihexagonal head, normal shank, short or medium length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1 100 MPa - Dimensions". This standard covers: This document specifies the dimensions of normal bihexagonal head bolts, with close or large tolerance normal shank and short or medium length MJ threads, in metallic material, coated or uncoated, with strength classes less than or equal to 1 100 MPa. This document is applicable to the compilation of aerospace product standards.

This document specifies the dimensions of normal bihexagonal head bolts, with close or large tolerance normal shank and short or medium length MJ threads, in metallic material, coated or uncoated, with strength classes less than or equal to 1 100 MPa. This document is applicable to the compilation of aerospace product standards.

ISO 3185:2021 is classified under the following ICS (International Classification for Standards) categories: 49.030.20 - Bolts, screws, studs. The ICS classification helps identify the subject area and facilitates finding related standards.

ISO 3185:2021 has the following relationships with other standards: It is inter standard links to ISO 3185:2008. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

You can purchase ISO 3185:2021 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of ISO standards.

Standards Content (Sample)


INTERNATIONAL ISO
STANDARD 3185
Third edition
2021-03
Aerospace — Bolts, normal
bihexagonal head, normal shank,
short or medium length MJ threads,
metallic material, coated or uncoated,
strength classes less than or equal to
1 100 MPa — Dimensions
Aéronautique et espace — Vis à tête bihexagonale normale, avec tige
normale et filetages MJ courts ou de longueur moyenne, en matériau
métallique, revêtues ou non revêtues, des classes de résistance
inférieures ou égales à 1 100 MPa — Dimensions
Reference number
©
ISO 2021
© ISO 2021
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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Configuration and dimensions . 1
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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles,
Subcommittee SC 4, Aerospace fastener systems.
This third edition cancels and replaces the second edition (ISO 3185:2008), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— some titles of columns in Table 1 have been corrected;
— the footnotes to Figure 1 and Table 1 have been clarified.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodi
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.

Loading comments...