ISO 965-1-2013 PDF

Full title and description

ISO 965-1:2013 — ISO general purpose metric screw threads — Tolerances — Part 1: Principles and basic data. This part defines the tolerance system and basic data for ISO general purpose metric screw threads (designation M) and refers to the basic profile given in ISO 68-1.

Abstract

ISO 965-1:2013 specifies the principles and basic data of a tolerance system for ISO general purpose metric screw threads (M) that conform to ISO 261. It gives the definitions, fundamental deviations and tables of limits of size and tolerance positions that form the basis for selecting tolerance classes for external and internal threads and for ensuring interchangeability and fit.

General information

• Status: Published (standard to be revised / replacement under publication).
• Publication date: 13 September 2013 (corrected French version: November 2017).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 21.040.10 (Metric screw threads).
• Edition / version: Edition 4 (2013); amended by ISO 965-1:2013/Amd 1:2021.
• Number of pages: 20 pages.

Scope

This part of ISO 965 specifies a tolerance system for ISO general purpose metric screw threads (M) in accordance with ISO 261 and with the basic profile of ISO 68-1. It establishes the principles, symbols and tables of fundamental deviations and limits of size used when selecting tolerance positions and classes for both external and internal general-purpose metric threads, enabling consistent specification, manufacture and inspection.

Key topics and requirements

• Definition of the tolerance system for ISO general purpose metric screw threads (M).
• Specification of fundamental deviations and tolerance positions for external and internal threads.
• Tables of limits of size and rules for deriving limits for different tolerance classes.
• Reference to the basic thread profile (ISO 68-1) and to ISO 261 for thread designation and nominal sizes.
• Guidance to ensure interchangeability, fit and correct mating of threaded parts.
• Amendment handling (includes Amendment 1 published in 2021 and corrected language text updates).

Typical use and users

ISO 965-1:2013 is used by mechanical designers, fastener manufacturers, production engineers, quality and inspection personnel, standards committees and procurement/specification writers who need to specify thread tolerances, select appropriate tolerance classes for fits, or verify conformity of metric threaded parts for general-purpose applications.

Related standards

ISO 965-1 is part of the ISO 965 series on metric screw thread tolerances. Closely related documents include ISO 261 (general plan and designation of ISO metric threads), ISO 68-1 (basic profile), ISO 965-2/3/4/5 (other parts of the tolerance series), ISO 1502 (gauges and gauging), ISO 262 and ISO 5408 (thread vocabulary and related guidance).

Keywords

metric thread, ISO metric screw threads, tolerances, limits of size, fundamental deviation, tolerance class, basic profile, ISO 261, ISO 68-1, thread fit, screw threads, interchangeability.

FAQ

Q: What is this standard?

A: ISO 965-1:2013 is the International Standard that defines the principles and basic data of the tolerance system for ISO general purpose metric screw threads (designation M).

Q: What does it cover?

A: It covers the tolerance system: symbols, definitions, fundamental deviations, tolerance positions and tables of limits of size used to specify and verify general-purpose metric external and internal threads that conform to ISO 261 and reference the basic profile in ISO 68-1.

Q: Who typically uses it?

A: Mechanical designers, fastener and component manufacturers, inspection and quality teams, standards developers and procurement/specification authors who need consistent thread tolerancing for mating parts.

Q: Is it current or superseded?

A: ISO 965-1:2013 is a published and widely used edition (Edition 4, 2013) and was amended in 2021. It has been marked for revision; a new edition of ISO 965-1 is/was under publication to replace the 2013 edition. Users should check the latest national/ISO listings or their standards provider to confirm the absolute current status before citing the standard in a specification.

Q: Is it part of a series?

A: Yes. ISO 965-1 is Part 1 of the ISO 965 series (tolerances for ISO general purpose metric screw threads). The series includes other parts that cover limits of sizes, deviations for constructional threads and special mating conditions (Parts 2–5 and related documents).

Q: What are the key keywords?

A: Metric thread, tolerance system, limits of size, fundamental deviation, basic profile, ISO 261, ISO 68-1, thread fit, screw threads.