ISO 965-2-2024 PDF

Full title and description

ISO 965-2:2024 — ISO general purpose metric screw threads — Tolerances — Part 2: Limits of sizes for internal and external threads (tolerance classes 6H and 6g for M1,6 to M100 and 5H and 6h for M1 to M1,4). This part gives the limit (maximum and minimum) pitch and crest (major, minor and pitch) diameters for ISO general-purpose metric threads used for fastening.

Abstract

This document specifies the limits of sizes for pitch and crest diameters of ISO general purpose metric screw threads (M) conforming to ISO 262 and having basic and design profiles according to ISO 68-1. It is applicable to metric fastening screw threads with tolerance classes 6H and 6g for M1,6 to M100 and 5H and 6h for M1 to M1,4.

General information

• Status: Published.
• Publication date: 15 November 2024 (Edition 4, 2024).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 21.040.10 (Metric screw threads).
• Edition / version: Edition 4 (2024).
• Number of pages: 7 (ISO published text).

Scope

ISO 965-2:2024 defines the limit sizes for internal and external ISO metric screw threads intended for general-purpose fastening where specified tolerance classes are used. The standard gives numerical limits for major, minor and pitch diameters derived from the tolerance system described in ISO 965-1 and applies specifically to tolerance classes 6H/6g (for M1,6 to M100) and 5H/6h (for M1 to M1,4). It references the basic and design thread profiles in ISO 68-1 and the selected sizes in ISO 262.

Key topics and requirements

• Numeric limits (upper and lower deviation limits) for pitch and crest diameters (major, minor and pitch) for internal and external metric threads.
• Applicability to specified tolerance classes: 6H/6g for M1,6–M100 and 5H/6h for M1–M1,4.
• Conformance to ISO general-purpose metric thread profiles (basic/design profiles per ISO 68-1).
• Reference to related parts of the ISO 965 series (principles, basic data) for the tolerance system.
• Intended use with selected thread sizes as listed in ISO 262 for fastening applications.

Typical use and users

Mechanical designers, fastener manufacturers, quality/control and metrology laboratories, tooling and machining engineers, procurement/specification writers, and standards bodies use this part when selecting or verifying thread limits for metric fasteners in general engineering and industrial applications. The standard is used to ensure interchangeability and correct fit for mating internal and external threads where the specified tolerance classes are required.

Related standards

Key related documents include ISO 965-1 (Part 1 — Principles and basic data for the tolerance system), ISO 68-1 (basic and design profiles for metric threads), ISO 262 (selected sizes for bolts, screws, studs and nuts) and normative references such as ISO 5408 (screw thread vocabulary) cited by purchasers/implementers. These parts together define thread geometry, preferred sizes and the tolerance framework used to derive the limits given in ISO 965-2.

Keywords

metric screw threads, thread tolerances, limits of sizes, major diameter, minor diameter, pitch diameter, 6H, 6g, 5H, 6h, ISO 965, ISO 68-1, ISO 262

FAQ

Q: What is this standard?

A: ISO 965-2:2024 is Part 2 of the ISO 965 series that specifies numeric limit sizes for internal and external ISO general-purpose metric screw threads for specified tolerance classes used in fastening applications.

Q: What does it cover?

A: It gives the allowable upper and lower limit (maximum and minimum) values for pitch and crest diameters (major, minor and pitch diameters) for the listed metric thread sizes and tolerance classes (6H/6g for M1,6–M100 and 5H/6h for M1–M1,4). The limits are derived from the tolerance principles in ISO 965-1 and the thread profiles in ISO 68-1.

Q: Who typically uses it?

A: Engineers, manufacturers of threaded fasteners and mating parts, quality and inspection labs, tooling vendors, and standards/technical committees use ISO 965-2 to specify or verify dimensional limits for metric threads.

Q: Is it current or superseded?

A: Current — ISO 965-2:2024 is the published (Edition 4) version that replaces earlier editions (for example ISO 965-2:1998 and its amendments). The 2024 edition is the active international text.

Q: Is it part of a series?

A: Yes — it is Part 2 of the ISO 965 series on general-purpose metric screw thread tolerances. Other related parts include ISO 965-1 (principles and basic data) and additional parts covering other tolerance grades or guidance.

Q: What are the key keywords?

A: Metric screw threads; thread limits; tolerance classes 6H/6g and 5H/6h; major/minor/pitch diameters; ISO 965; ISO 68-1; ISO 262.