ISO 3353-1-2020 PDF

Full title and description

St ISO 3353-1-2020 — Aerospace — Lead and runout threads — Part 1: Rolled external threads. Specifies lead and runout requirements and the inspection method for rolled external threads used in aerospace construction; applicable whenever referenced in a definition document.

Abstract

This part of ISO 3353 sets out the form, limits and inspection procedure to determine acceptability of incompletely formed (lead and runout) rolled external threads for aerospace applications. It is intended for use when referenced by definition documents and as the inspection method in case of dispute.

General information

• Status: Published.
• Publication date: December 2020 (Edition 2, 2020).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.030.10 (Screw threads).
• Edition / version: Edition 2 (2020).
• Number of pages: 10 (ISO published document length).

Scope

Defines lead and runout requirements for rolled external threads in aerospace construction and specifies the inspection method to be used in case of dispute. The standard applies whenever it is invoked by a definition or product specification document and is focused on ensuring consistent thread starts and finishes for rolled external-thread fasteners.

Key topics and requirements

• Definitions and terminology for lead and runout (incomplete thread starts/ends) for rolled external threads.
• Form and limit requirements for acceptable lead and runout geometry on rolled external threads.
• Inspection method and procedures to be used in case of dispute between supplier and purchaser.
• Applicability statements indicating use when referenced by other definition documents.
• Compatibility with aerospace fastener manufacturing and quality assurance practices (rolled-thread production processes and gauges/inspection tools).

Typical use and users

Intended users include aerospace fastener manufacturers (rolling operations), component designers and engineers, quality and inspection personnel, maintenance/repair organisations, and procurement/specification writers who need defined acceptance criteria for rolled external thread starts and finishes. The standard supports interchangeability, fatigue performance, and assembly reliability in aerospace hardware.

Related standards

Part of the ISO 3353 series addressing incomplete threads and runout. The companion document ISO 3353-2:2020 covers internal threads (blind tapped holes) and related undercut requirements. The 2020 parts replace earlier 2002 editions of ISO 3353-1 and ISO 3353-2. Users should consult other aerospace thread and fastener standards (ISO/TC 20/SC 4 outputs) when specifying threaded interfaces.

Keywords

aerospace; lead threads; runout threads; rolled external threads; thread inspection; fasteners; ISO 3353; thread starts; thread runout; aerospace fasteners.

FAQ

Q: What is this standard?

A: ISO 3353-1:2020 is an international standard that specifies lead and runout requirements and an inspection method for rolled external threads used in aerospace construction.

Q: What does it cover?

A: It covers the acceptable form and limits of incomplete thread starts and ends (lead and runout) on rolled external threads and the inspection procedure to resolve disputes over acceptability; it is applied when referenced by definition documents.

Q: Who typically uses it?

A: Fastener manufacturers, design and mechanical engineers in aerospace, quality/inspection teams, maintenance and repair organizations, and procurement/specification authors concerned with threaded component interchangeability and reliability.

Q: Is it current or superseded?

A: ISO 3353-1:2020 (Edition 2, 2020) is the current published edition and replaces the earlier ISO 3353-1:2002 version. The standard is maintained under ISO review procedures.

Q: Is it part of a series?

A: Yes — it is Part 1 of the ISO 3353 series; Part 2 (ISO 3353-2:2020) addresses internal threads (blind tapped holes) and related undercut requirements.

Q: What are the key keywords?

A: Aerospace, lead threads, runout, rolled external threads, thread inspection, fasteners, thread starts, thread ends, ISO 3353.