ISO 8279:2008

Aerospace - Nuts, hexagonal, plain, normal height, normal across flats, with MJ threads, classifications: 600 MPa (at ambient temperature)/120 degrees C, 600 MPa (at ambient temperature)/235 degrees C, 900 MPa (at ambient temperature)/425 degrees C, 1 100 MPa (at ambient temperature)/235 degrees C, 1 100 MPa (at ambient temperature)/315 degrees C, 1 100 MPa (at ambient temperature)/650 degrees C, 1 210 MPa (at ambient temperature)/730 degrees C, 1 250 MPa (at ambient temperature)/235 degrees C and 1 550 MPa (at ambient temperature)/600 degrees C - Dimensions

ISO 8279:2008 specifies the dimensions of plain, hexagonal nuts, of normal height, normal across flats, with MJ threads, of classifications: 600 MPa/120 °C, 600 MPa/235 °C, 900 MPa/425 °C, 1 100 MPa/235 °C, 1 100 MPa/315 °C, 1 100 MPa/650 °C, 1 210 MPa/730 °C, 1 250 MPa/235 °C and 1 550 MPa/600 °C. Nuts provided with holes are intended to be used with lockwire in conformity with ISO 245. ISO 8279:2008 is only applicable for the compilation of aerospace product standards.

Aéronautique et espace — Écrous hexagonaux ordinaires, hauteur normale, surplats normaux, filetages MJ, classifications: 600 MPa (à température ambiante)/120 degrés C, 600 MPa (à température ambiante)/235 degrés C, 900 MPa (à température ambiante)/425 degrés C, 1 100 MPa (à température ambiante)/235 degrés C, 1 100 MPa (à température ambiante)/315 degrés C, 1 100 MPa (à température ambiante)/650 degrés C, 1 210 MPa (à température ambiante)/730 degrés C, 1 250 MPa (à température ambiante)/235 degrés C et 1 550 MPa (à température ambiante)/600 degrés C — Dimensions

General Information

• Status: Published
• Publication Date: 20-Jul-2008
• ICS: 49.030.30 - Nuts
• Technical Committee: ISO/TC 20/SC 4 - Aerospace fastener systems
• Drafting Committee: ISO/TC 20/SC 4 - Aerospace fastener systems
• Current Stage: 9093 - International Standard confirmed
• Start Date: 19-Oct-2021
• Completion Date: 13-Dec-2025

Relations

• Consolidated By: ISO 13786:2017 - Thermal performance of building components - Dynamic thermal characteristics - Calculation methods
• Effective Date: 06-Jun-2022
• Revises: ISO 8279:1997 - Aerospace - Nuts, hexagonal, plain, normal height, normal across flats, with MJ threads, classifications: 600 MPa (at ambient temperature)/120 degrees C, 600 MPa (at ambient temperature)/235 degrees C, 900 MPa (at ambient temperature)/425 degrees C, 1 100 MPa (at ambient temperature)/235 degrees C, 1 100 MPa (at ambient temperature)/315 degrees C, 1 100 MPa (at ambient temperature)/650 degrees C, 1 210 MPa (at ambient temperature)/730 degrees C, 1 250 MPa (at ambient temperature)/235 degrees C and 1 550 MPa (at ambient temperature)/600 degrees C - Dimensions
• Effective Date: 15-Apr-2008

Overview - ISO 8279:2008 (Aerospace hexagonal nuts, MJ threads, dimensions)

ISO 8279:2008 defines the dimensional requirements for plain, hexagonal nuts of normal height and normal across flats that use MJ threads, intended for aerospace applications. The standard covers nuts in several strength/temperature classifications (e.g., 600 MPa/120 °C, 900 MPa/425 °C, 1 550 MPa/600 °C, etc.) and is intended specifically for use when compiling aerospace product standards to ensure interchangeability, fit and assembly compatibility.

Key topics and technical requirements

• Scope: Dimensions for plain hexagonal nuts with MJ threads across multiple tensile-strength and maximum-temperature classifications.
• Dimensional data: Exact geometry, nominal sizes and tolerances are given in the standard’s Figure 1 and Table 1; dimensions are expressed in millimetres.
• Surface treatment rule: Dimensions apply after any surface coating(s) but before the application of any lubricant.
• Threading and limits: Thread specifications and limit dimensions reference ISO 5855-2 (MJ threads).
• Form and position tolerances: Conformance to ISO 8788 for tolerances of form and position.
• Lockwire provisions: Nuts with holes are intended for use with lockwire and must conform to ISO 245 lockwire diameter guidance.
• Application restriction: ISO 8279:2008 is intended only for the compilation of aerospace product standards (not general commercial use).

Practical applications and who uses this standard

ISO 8279:2008 is practical for professionals who design, specify, manufacture, procure or inspect aerospace fasteners:

• Aerospace design and stress engineers specifying fastener geometry and material class for temperature-critical assemblies.
• Fastener manufacturers producing MJ-threaded hexagonal nuts to meet aerospace dimensional interchangeability.
• Procurement and quality assurance teams ensuring incoming nuts meet dimensional and tolerance requirements for specific strength/temperature classes.
• Maintenance, repair and overhaul (MRO) organizations selecting compliant replacement nuts that accept lockwire or meet high-temperature service requirements.
• Standards writers compiling aerospace product standards or procurement specifications.

Related standards

• ISO 5855-2 - MJ threads: limit dimensions for bolts and nuts.
• ISO 8788 - Nuts, metric: tolerances of form and position.
• ISO 245 - Lockwire diameters (for nuts with lockwire holes).
• ISO 9139 - Procurement specification (referenced for test requirements).

By using ISO 8279:2008 in combination with these related standards, stakeholders ensure reliable dimensional compatibility, traceable specifications and safe, repeatable use of MJ-threaded hexagonal nuts in aerospace assemblies.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 8279
Third edition
2008-08-01
Aerospace — Nuts, hexagonal, plain,
normal height, normal across flats, with
MJ threads, classifications: 600 MPa (at
ambient temperature)/120 °C, 600 MPa (at
ambient temperature)/235 °C, 900 MPa (at
ambient temperature)/425 °C, 1 100 MPa
(at ambient temperature)/235 °C,
1 100 MPa (at ambient
temperature)/315 °C, 1 100 MPa (at
ambient temperature)/650 °C, 1 210 MPa
(at ambient temperature)/730 °C,
1 250 MPa (at ambient
temperature)/235 °C and 1 550 MPa
(at ambient temperature)/600 °C —
Dimensions
Aéronautique et espace — Écrous hexagonaux ordinaires, hauteur
normale, surplats normaux, à filetages MJ, classifications: 600 MPa
(à température ambiante)/120 °C, 600 MPa (à température
ambiante)/235 °C, 900 MPa (à température ambiante)/425 °C,
1 100 MPa (à température ambiante)/235 °C, 1 100 MPa
(à température ambiante)/315 °C, 1 100 MPa (à température
ambiante)/650 °C, 1 210 MPa (à température ambiante)/730 °C,
1 250 MPa (à température ambiante)/235 °C et 1 550 MPa
(à température ambiante)/600 °C — Dimensions

Reference number
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ISO 2008
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ii © ISO 2008 – All rights reserved

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
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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 8279 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 8279:1997), which has been technically
revised.
Introduction
The dimensions specified in this International Standard have been determined to satisfy the requirements of
the procurement specification ISO 9139.

iv © ISO 2008 – All rights reserved

INTERNATIONAL STANDARD ISO 8279:2008(E)

Aerospace — Nuts, hexagonal, pl
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