Aerospace - Nuts, hexagonal, slotted (castellated), reduced height, normal across flats, with MJ threads, classifications: 450 MPa (at ambient temperature)/120 degrees C, 450 MPa (at ambient temperature)/235 degrees C, 600 MPa (at ambient temperature)/425 degrees C, 900 MPa (at ambient temperature)/235 degrees C, 900 MPa (at ambient temperature)/315 degrees C, 900 MPa (at ambient temperature)/650 degrees C, 1 100 MPa (at ambient temperature)/235 degrees C, 1 100 MPa (at ambient temperature)/730 degrees C and 1 250 MPa (at ambient temperature)/600 degrees C - Dimensions

ISO 9618:2016 specifies the dimensions of hexagon slotted (castellated) nuts, reduced height, normal across flats, with MJ threads, of classifications: 450 MPa/120 °C, 450 MPa/235 °C, 600 MPa/425 °C, 900 MPa/235 °C, 900 MPa/315 °C, 900 MPa/650 °C, 1 100 MPa/235 °C, 1 100 MPa/730 °C, and 1 250 MPa/600 °C. These nuts are intended to be used with split pins in conformity with ISO 1234. ISO 9618:2016 is applicable for the compilation of aerospace product standards.

Aéronautique et espace — Écrous hexagonaux à créneaux, hauteur réduite, surplats normaux, à filetage MJ, classifications: 450 MPa (à température ambiante)/120 degrés C, 450 MPa (à température ambiante)/235 degrés C, 600 MPa (à température ambiante)/425 degrés C, 900 MPa (à température ambiante)/235 degrés C, 900 MPa (à température ambiante)/315 degrés C, 900 MPa (à température ambiante)/650 degrés C, 1 100 MPa (à température ambiante)/235 degrés C, 1 100 MPa (à température ambiante)/730 degrés C et 1 250 MPa (à température ambiante)/600 degrés C — Dimensions

General Information

Status
Published
Publication Date
17-Feb-2016
Current Stage
9093 - International Standard confirmed
Start Date
19-Oct-2021
Completion Date
13-Dec-2025

Relations

Effective Date
29-Mar-2014

Overview

ISO 9618:2016 is an international aerospace standard that specifies the dimensions of hexagonal, slotted (castellated), reduced-height nuts with MJ threads. It covers nuts of multiple strength/temperature classifications (450 MPa, 600 MPa, 900 MPa, 1 100 MPa and 1 250 MPa combined with corresponding maximum service temperatures) intended for use with split pins. The document provides configuration drawings, a dimension table (in millimetres) and tolerancing guidance for use in the compilation of aerospace product standards.

Key topics and technical requirements

  • Configuration and dimensions: Detailed geometry for hexagon slotted (castellated) reduced-height nuts, shown in Figure 1 and Tabular data (Table 1). Dimensions and tolerances are expressed in millimetres.
  • Thread system: MJ thread profiles and limit dimensions referenced to ISO 5855‑2.
  • Strength/temperature classifications: Nuts are specified for classifications such as 450 MPa/120 °C, 450 MPa/235 °C, 600 MPa/425 °C, 900 MPa/235 °C, 900 MPa/315 °C, 900 MPa/650 °C, 1 100 MPa/235 °C, 1 100 MPa/730 °C and 1 250 MPa/600 °C. Notes clarify that the MPa value refers to minimum tensile stress at ambient temperature and the temperature value to the maximum temperature the nut can withstand without permanent alteration (surface treatment dependent).
  • Compatibility with split pins: Intended for use with split pins conforming to ISO 1234; Table 1 gives thread/split‑pin diameter relationships.
  • Form and position tolerances: Tolerances of form and position are to conform with ISO 8788.
  • Surface treatment consideration: Dimensions apply after any surface coating(s) but before application of any lubricant.

Applications and users

  • Aerospace designers and engineers specifying fasteners for airframes, engines and high-temperature components where weight, strength and locking via split pins are required.
  • Fastener manufacturers producing MJ-thread castellated nuts to aerospace tolerances and coatings.
  • Procurement and quality assurance teams verifying conformity of nuts to dimensional, thread and classification requirements.
  • Maintenance and repair organizations (MROs) selecting replacement hardware compatible with split‑pin locking and approved fit/strength classes.

Practical uses include securing high-strength bolted joints where a castellated nut + split pin provides positive mechanical locking under vibration and thermal cycling.

Related standards

  • ISO 1234 - Split pins (compatibility)
  • ISO 5855‑2 - MJ threads - Limit dimensions for bolts and nuts
  • ISO 8788 - Aerospace nuts - Tolerances of form and position

Keywords: ISO 9618:2016, aerospace nuts, castellated nuts, MJ threads, reduced height hexagon nut, dimensions, split pin, ISO 1234, fastener standard.

Standard

ISO 9618:2016 - Aerospace -- Nuts, hexagonal, slotted (castellated), reduced height, normal across flats, with MJ threads, classifications: 450 MPa (at ambient temperature)/120 degrees C, 450 MPa (at ambient temperature)/235 degrees C, 600 MPa (at ambient temperature)/425 degrees C, 900 MPa (at ambient temperature)/235 degrees C, 900 MPa (at ambient temperature)/315 degrees C, 900 MPa (at ambient temperature)/650 degrees C, 1 100 MPa (at ambient temperature)/235 degrees C, 1 100 MPa (at ambient temperature)/730 degrees C and 1 250 MPa (at ambient temperature)/600 degrees C -- Dimensions

English language
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Frequently Asked Questions

ISO 9618:2016 is a standard published by the International Organization for Standardization (ISO). Its full title is "Aerospace - Nuts, hexagonal, slotted (castellated), reduced height, normal across flats, with MJ threads, classifications: 450 MPa (at ambient temperature)/120 degrees C, 450 MPa (at ambient temperature)/235 degrees C, 600 MPa (at ambient temperature)/425 degrees C, 900 MPa (at ambient temperature)/235 degrees C, 900 MPa (at ambient temperature)/315 degrees C, 900 MPa (at ambient temperature)/650 degrees C, 1 100 MPa (at ambient temperature)/235 degrees C, 1 100 MPa (at ambient temperature)/730 degrees C and 1 250 MPa (at ambient temperature)/600 degrees C - Dimensions". This standard covers: ISO 9618:2016 specifies the dimensions of hexagon slotted (castellated) nuts, reduced height, normal across flats, with MJ threads, of classifications: 450 MPa/120 °C, 450 MPa/235 °C, 600 MPa/425 °C, 900 MPa/235 °C, 900 MPa/315 °C, 900 MPa/650 °C, 1 100 MPa/235 °C, 1 100 MPa/730 °C, and 1 250 MPa/600 °C. These nuts are intended to be used with split pins in conformity with ISO 1234. ISO 9618:2016 is applicable for the compilation of aerospace product standards.

ISO 9618:2016 specifies the dimensions of hexagon slotted (castellated) nuts, reduced height, normal across flats, with MJ threads, of classifications: 450 MPa/120 °C, 450 MPa/235 °C, 600 MPa/425 °C, 900 MPa/235 °C, 900 MPa/315 °C, 900 MPa/650 °C, 1 100 MPa/235 °C, 1 100 MPa/730 °C, and 1 250 MPa/600 °C. These nuts are intended to be used with split pins in conformity with ISO 1234. ISO 9618:2016 is applicable for the compilation of aerospace product standards.

ISO 9618:2016 is classified under the following ICS (International Classification for Standards) categories: 49.030.30 - Nuts. The ICS classification helps identify the subject area and facilitates finding related standards.

ISO 9618:2016 has the following relationships with other standards: It is inter standard links to ISO 9618:1996. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

ISO 9618:2016 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


INTERNATIONAL ISO
STANDARD 9618
Second edition
2016-02-15
Aerospace — Nuts, hexagonal,
slotted (castellated), reduced height,
normal across flats, with MJ threads,
classifications: 450 MPa (at ambient
temperature)/120 °C, 450 MPa (at
ambient temperature)/235 °C,
600 MPa (at ambient temperature)/
425 °C, 900 MPa (at ambient
temperature)/235 °C, 900 MPa (at
ambient temperature)/315 °C,
900 MPa (at ambient temperature)/
650 °C, 1 100 MPa (at ambient
temperature)/235 °C, 1 100 MPa
(at ambient temperature)/
730 °C and 1 250 MPa (at ambient
temperature)/600 °C — Dimensions
Aéronautique et espace — Écrous hexagonaux à créneaux, hauteur
réduite, surplats normaux, à filetage MJ, classifications: 450 MPa
(à température ambiante)/120 °C, 450 MPa (à température
ambiante)/235 °C, 600 MPa (à température ambiante)/425 °C,
900 MPa (à température ambiante)/235 °C, 900 MPa (à température
ambiante)/315 °C, 900 MPa (à température ambiante)/650 °C,
1 100 MPa (à température ambiante)/235 °C, 1 100 MPa
(à température ambiante)/730 °C et 1 250 MPa (à température
ambiante)/600 °C — Dimensions
Reference number
©
ISO 2016
© ISO 2016, Published in Switzerland
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ii © ISO 2016 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Configuration and dimensions . 1
Foreword
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electrotechnical standardization.
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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 20, Aircraft and space vehicles, Subcommittee
SC 4, Aerospace fastener systems.
This second edition cancels and replaces the first edition (ISO 9618:1996), of whic
...

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