ISO 8641:2008 PDF

Name: ISO 8641:2008 — Aerospace — Self-locking nuts with maximum operating temperature greater than 425 degrees C — Procurement specification
SKU: ISO 8641:2008
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Aerospace — Self-locking nuts with maximum operating temperature greater than 425 degrees C — Procurement specification

Название (английский):

ISO 8641:2008

Aerospace — Self-locking nuts with maximum operating temperature greater than 425 degrees C — Procurement specification

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 23
Дата публикации:: 26 августа 2008 г.
Издание:: ISO IS 8641 edition 2 version 1
ICS:: 49.030.30

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Описание (английский):

ISO 8641:2008 specifies the required characteristics for metric self-locking nuts, with MJ thread, for use in aerospace construction at a maximum temperature greater than 425 °C. ISO 8641:2008 is applicable to nuts as defined above, provided that reference is made to this International Standard in the relevant definition document.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 8641:2008 - "Aerospace - Self‑locking nuts with maximum operating temperature greater than 425 °C - Procurement specification" - defines procurement, inspection and quality requirements for metric self‑locking nuts (MJ thread) intended for aerospace use at temperatures above 425 °C. The standard is a procurement/specification document: it applies when referenced in a nut’s definition document (e.g., drawing, in‑house or other standard) and complements material, dimensional and functional requirements given elsewhere.

Key topics and technical requirements

Scope and applicability: Metric MJ‑thread self‑locking nuts for aerospace applications where maximum operating temperature > 425 °C.

Material and microstructure: Material type must be verified (spectrographic/spectroscopic analysis) and microstructure inspected to ensure freedom from cracks, acceptable inclusion levels and grain size per the material standard.

Surface discontinuities: Permissible discontinuity types and maximum depths are specified (see Annex A). Fluoroscopic inspection is used to detect internal/hidden defects.

Mechanical definitions: The standard defines torques relevant to locking performance - self‑locking torque, seating torque, unseating torque, breakaway torque and wrench torque - to guide testing and functional requirements.

Quality assurance & sampling: Manufacturers must demonstrate continuous capability; qualification testing (e.g., 100 nuts by simple random sampling for full qualification) and production acceptance inspections are required. Sampling plans reference ISO 2859‑1 AQL schemes. Specific sample sizes for individual tests (e.g., spectrographic, micrographic, fluoroscopic) are included in Table 1.

Test methods and traceability: Where no single international method exists, user and manufacturer must agree on methods for spectrographic analysis, micrographic inspection, chemical reagent checks for coatings, surface roughness measurement and fluoroscopy. ISO 8642 (test methods) is a related reference.

Use of SPC: The standard permits substitution of lot sampling by an approved Statistical Process Control (SPC) program if validated and accepted by the qualifying authority.

Applications and typical users

Applications: High‑temperature aerospace assemblies such as engines, hot structures, exhaust and turbine interfaces, and any fastened joint exposed regularly to >425 °C where reliable self‑locking performance is critical.

Users: Fastener manufacturers and suppliers, aerospace OEMs and MROs, procurement and quality engineers, certification authorities, and design engineers specifying high‑temperature fasteners.

Related standards

Commonly referenced standards in ISO 8641:2008 include:

ISO 8642 (test methods for these nuts)

ISO 5855‑2 (MJ threads dimensions)

ISO 9199 (nut classifications)

ISO 2859‑1 (sampling procedures)

ISO 4288, ISO 8788 and other ISO quality/surface and inspection documents

ISO 8641:2008 provides the procurement and acceptance framework to ensure self‑locking nuts perform reliably in high‑temperature aerospace environments.

ISO 8641:2008 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and typical users

Related standards

Технические детали

SIST ISO 2859-1:2003/Amd 1:2020

Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality lim…

ISO 8642:1986

Aerospace — Self-locking nuts with maximum operating temperature greater than 425 degrees C — Test methods

ISO 5855-2:1988

Aerospace — MJ threads — Part 2: Limit dimensions for bolts and nuts

ISO 9:1995/Amd 1:2024

Information and documentation — Transliteration of Cyrillic characters into Latin characters — Slavic and non…

ISO 4288:1996/Cor 1:1998

Geometrical Product Specifications (GPS) — Surface texture: Profile method — Rules and procedures for the ass…

ISO 8788:1987

Aerospace — Fasteners — Tolerances of form and position for nuts