ISO 7961-2021 PDF

Full title and description

ISO 7961:2021 — Aerospace — Bolts — Test methods. This International Standard specifies standardized test methods and reporting conventions for bolts used in aerospace applications, replacing the earlier 1994 edition and aligning bolt test procedures with current calibration and verification requirements for testing machines.

Abstract

ISO 7961:2021 defines test procedures and normative references necessary to assess mechanical and durability properties of aerospace bolts. The document includes references (for example ISO 7500‑1) required for calibration and verification of force-measuring systems used during testing, and it formalizes test validity and reporting practices for procurement and certification.

General information

• Status: Published.
• Publication date: 28 January 2021.
• Publisher: ISO (International Organization for Standardization).
• ICS / categories: 49.030.20 (bolts, screws, studs).
• Edition / version: Edition 2 (2021).
• Number of pages: 17.

Scope

This standard specifies test methods applicable to bolts intended for aerospace constructions. It defines the required test apparatus and conditions, the normative references for calibration of test equipment (notably ISO 7500‑1), and requirements for test validity and reporting so results are reproducible and suitable for procurement, qualification and certification purposes. The 2021 edition supersedes ISO 7961:1994.

Key topics and requirements

• Standardized mechanical test procedures for aerospace bolts (tensile, shear and durability-related methods as used in procurement and qualification).
• Requirements for test-machine calibration and force-measuring verification (references ISO 7500‑1).
• Procedures for elevated-temperature testing, stress relaxation and stress-rupture where applicable (reflecting test categories historically included under ISO 7961).
• Inspection procedures such as detection of grinding burns and acceptance criteria for test specimens.
• Requirements for test validity, reporting format and traceability to ensure consistent results across laboratories and suppliers.

Typical use and users

Used by aerospace OEMs, fastener manufacturers, materials and mechanical test laboratories, procurement/specification engineers, and certification/bodies responsible for qualifying fasteners and assemblies. The standard is referenced in procurement documents and test plans where consistent, repeatable bolt test results are required.

Related standards

Normative and related references include ISO 7500‑1 (calibration and verification of static uniaxial testing machines — tension/compression machines), plus other aerospace fastener and testing standards maintained by ISO/TC 20/SC 4. The 2021 edition replaces ISO 7961:1994.

Keywords

aerospace; bolts; fasteners; test methods; tensile test; shear test; fatigue; stress rupture; ISO 7500-1; calibration; test report; qualification.

FAQ

Q: What is this standard?

A: ISO 7961:2021 is an International Standard that specifies test methods for bolts used in aerospace applications, providing procedures, equipment references and reporting requirements.

Q: What does it cover?

A: It covers standardized test methods (mechanical and durability tests), calibration/verification references for test equipment, specimen inspection (for example grinding-burn checks) and guidelines for test validity and reporting. The standard supersedes the 1994 edition and brings those methods into the 2021 edition.

Q: Who typically uses it?

A: Aerospace manufacturers (OEMs), fastener and component suppliers, independent test laboratories, procurement engineers and conformity/qualification bodies use this standard to specify and perform bolt testing.

Q: Is it current or superseded?

A: ISO 7961:2021 is the current edition (published 28 January 2021) and it replaced ISO 7961:1994. The ISO catalogue shows the 2021 edition as published and under the normal review lifecycle.

Q: Is it part of a series?

A: It is part of the set of aerospace fastener and test-method standards handled by ISO/TC 20/SC 4; while ISO 7961 is a standalone test-method standard, it references and is used alongside other related ISO standards (for example ISO 7500‑1 for test machine calibration).

Q: What are the key keywords?

A: Aerospace, bolts, fasteners, test methods, tensile, shear, fatigue, stress rupture, calibration, ISO 7500‑1.