ISO 4347-2015 PDF

Full title and description

Leaf chains, clevises and sheaves — Dimensions, measuring forces, tensile strengths and dynamic strengths. International Standard ISO 4347:2015 specifies dimensional and strength characteristics for leaf (ladder-type) chains used for general lifting purposes, together with rim profiles of sheaves and the chain‑attachment ends of clevises.

Abstract

ISO 4347:2015 gives dimensions, limits for interchangeability, length measurement procedures, preloading instructions, and minimum tensile and dynamic strength values for leaf chains and associated components (clevises and sheaves). Informative annexes include calculation methods for minimum dynamic strength and guidance to determine maximum test forces for dynamic strength conformance tests.

General information

• Status: Published (current; reviewed and confirmed as current in 2021).
• Publication date: 1 September 2015.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 21.220.30 — Chain drives and their components (leaf chains, sheaves, clevises).
• Edition / version: Edition 5 (2015).
• Number of pages: 20 pages (ISO edition).

Key bibliographic details above are taken from the ISO bibliographic record for ISO 4347:2015.

Scope

This standard specifies the characteristics of leaf chains used for general lifting purposes and the related geometry of sheaves and clevis attachments. It covers nominal sizes and dimensions (for interchangeability), methods for measuring chain length and for applying preload, minimum static (tensile) strengths and minimum dynamic strengths, and test guidance used to verify conformity to the stated strength requirements. Informative annex material addresses calculation of minimum dynamic strengths and determination of maximum test force when performing dynamic strength conformance testing.

Key topics and requirements

• Dimensional specifications for leaf chain link geometry to ensure interchangeability between manufacturers.
• Rim/profile dimensions for sheaves and chain-attachment end geometry for clevises to match leaf chain forms.
• Procedures for length measurement and recommended preloading before testing or service.
• Minimum tensile strength requirements (static strength) for specified chain sizes.
• Minimum dynamic strength requirements and test methods for verifying fatigue/dynamic performance.
• Informative calculation methods (annexes) for minimum dynamic strength and for determining maximum test force in dynamic tests; references to related test standards (e.g., guidance linked to ISO 15654 series).

Typical use and users

Engineers and designers of lifting and handling equipment, chain and sheave manufacturers, testing laboratories, quality and conformity assessors, procurement/specification authors, and maintenance personnel use ISO 4347 to specify, manufacture and verify leaf chains and compatible sheaves/clevises for safe lifting applications. The standard is used where interchangeability, predictable static and dynamic strength, and correct sheave/clevis geometry are required.

Related standards

Standards and documents commonly referenced with ISO 4347 include earlier editions of ISO 4347 (for historical comparison), and related test and calculation standards addressing dynamic strength verification such as the ISO 15654 series. National/adopted versions (for example DIN translations) reproduce ISO 4347:2015 content with national forewords and implementation guidance.

Keywords

leaf chain, leaf chains, clevis, clevises, sheave, sheaves, dimensions, interchangeability, tensile strength, dynamic strength, measuring forces, preloading, chain drives, lifting chains, ISO 4347

FAQ

Q: What is this standard?

A: ISO 4347:2015 is an international standard that specifies dimensions and strength requirements for leaf (ladder-type) chains and the mating geometry of clevises and sheaves used with them.

Q: What does it cover?

A: It covers dimensional data for interchangeability, length measurement, preloading practice, minimum tensile (static) strengths, minimum dynamic strengths, and includes informative annexes with calculation methods and test-force guidance for dynamic testing.

Q: Who typically uses it?

A: Chain and sheave manufacturers, design and mechanical engineers, testing laboratories, procurement/specification writers, maintenance and inspection teams, and standards bodies use it to ensure safe, interchangeable components and to verify static and dynamic performance.

Q: Is it current or superseded?

A: The version ISO 4347:2015 (Edition 5) was published on 1 September 2015 and the ISO bibliographic record shows it was reviewed and confirmed in 2021; it is listed as the current edition. For the most up‑to‑date status always check the national or ISO catalogue entry for any subsequent reviews or revisions.

Q: Is it part of a series?

A: ISO 4347 is a stand‑alone standard for leaf chains, but it is related to other chain and drive standards (within ISO/TC 100 work) and to dynamic‑strength/test standards such as ISO 15654 that are used together when specifying and testing chain assemblies.

Q: What are the key keywords?

A: Leaf chain, clevis, sheave, dimensions, tensile strength, dynamic strength, interchangeability, measuring forces, preloading, lifting chain.