ISO 15872-2017 PDF

Full title and description

ISO 15872:2017 — Aerospace — UNJ threads — Gauging. This International Standard specifies methods for the gauging and inspection of ISO UNJ screw threads used in aerospace applications; it is intended to ensure thread conformity with the dimensional and tolerance requirements given for UNJ threads (as referenced to ISO 3161).

Abstract

ISO 15872:2017 (Edition 2) provides standardized procedures and gauge types for verifying UNJ thread forms intended for aerospace fastener systems. The document defines gauging methods and acceptance criteria and allows alternative inspection methods only when correlation to the specified gauges is demonstrated. This edition replaces ISO 15872:2002 and was published in March 2017.

General information

• Status: Published (International Standard, confirmed in ISO review process).
• Publication date: March 2017 (Edition 2, published March 2017).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.030.10 (Screw threads / aerospace fastener systems).
• Edition / version: Edition 2 (2017). Replaces ISO 15872:2002.
• Number of pages: 22 pages (ISO published pagination).

Scope

Provides methods for the gauging of ISO UNJ threads that comply with ISO 3161. The standard covers selection and use of gauges, gauging procedures and acceptance criteria for production and inspection of external and internal UNJ threads in aerospace applications. It permits other verification methods provided they are correlated with the specified gauges.

Key topics and requirements

• Definitions and terminology for UNJ thread forms and gauging conventions.
• Specification of gauge types and their intended use (limit gauges, go/no‑go principles as applied to UNJ threads).
• Procedures for applying gauges to external and internal UNJ threads and criteria for acceptance/rejection.
• Requirements for correlation when alternative inspection or measurement methods are used (traceability and validation against the specified gauges).
• Normative references (notably ISO 3161 for UNJ thread form and related dimensional requirements).

Typical use and users

Used by aerospace manufacturers, fastener producers, quality and inspection engineers, metrology laboratories, procurement/specification teams, and maintenance/repair organisations to verify thread conformity on aircraft components and fastener systems. It supports production inspection, incoming inspection and acceptance testing of UNJ-threaded parts.

Related standards

Key related standards include ISO 3161 (UNJ thread form and dimensions) and other aerospace fastener and thread standards maintained by ISO/TC 20/SC 4; national adoptions (for example BS ISO 15872:2017) reproduce the ISO content with national pagination/formatting.

Keywords

UNJ threads, gauging, thread gauges, aerospace fasteners, screw threads, ISO 3161, inspection, metrology, limit gauges, go/no‑go.

FAQ

Q: What is this standard?

A: ISO 15872:2017 is an International Standard that specifies methods for gauging UNJ screw threads used in aerospace applications.

Q: What does it cover?

A: It covers gauge types and use, gauging procedures for external and internal UNJ threads, acceptance criteria, and allows alternative verification methods when correlated to the specified gauges (references ISO 3161 for thread form/dimensions).

Q: Who typically uses it?

A: Aerospace OEMs and suppliers, fastener manufacturers, quality/inspection engineers, metrology labs, procurement and maintenance organisations engaged with aircraft components and fastener systems.

Q: Is it current or superseded?

A: ISO 15872:2017 (Edition 2) replaced ISO 15872:2002; the 2017 edition is the current ISO edition (it was subject to ISO's periodic review and has been confirmed in the ISO records).

Q: Is it part of a series?

A: It is part of the set of ISO standards addressing aerospace fastener systems and screw threads (work of ISO/TC 20/SC 4) and is directly related to ISO 3161 (UNJ thread form). National bodies may publish identical national adoptions (e.g., BS ISO 15872:2017).

Q: What are the key keywords?

A: UNJ threads; gauging; thread gauges; aerospace fasteners; screw threads; inspection; ISO 3161.