ISO 2731-1973 PDF

Full title and description

ISO 2731:1973 — Dee shackles (designation sometimes shown as St ISO 2731-1973). This International Standard defined the form, dimensions and essential characteristics of dee (D-type) shackles used as accessories for lifting equipment.

Abstract

ISO 2731:1973 specified the characteristics and critical dimensions of forged dee (D) shackles to ensure interchangeability and safe use in lifting applications. The standard was published in December 1973, comprised a short technical specification (3 pages), and was later withdrawn and consolidated into ISO 2415 (1987) as part of a technical revision of shackle standards.

General information

• Status: Withdrawn / Cancelled.
• Publication date: December 1973 (1973-12).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 53.020.30 — Accessories for lifting equipment.
• Edition / version: Edition 1 (1973).
• Number of pages: 3.

Scope

ISO 2731:1973 covered dee shackles (D‑type shackles) intended for general lifting purposes, specifying form, principal dimensions, and essential marking and identification to permit interchangeability with other lifting components. The standard was short (3 pages) and focused on dimensional and identification requirements rather than extended test protocols. It was withdrawn and its technical content incorporated into ISO 2415 (1987) as part of a harmonisation of forged shackle standards; the effective withdrawal/revision process took place in the 1980s (ISO 2731:1973 was cancelled in favour of ISO 2415).

Key topics and requirements

• Definition and designation of dee (D) shackles and associated terminology.
• Principal dimensions and dimensional tolerances required for interchangeability (eye/work‑opening, pin diameter, overall length/width, etc.).
• Marking and identification requirements (manufacturer/mark, grade or class, and working load limit or traceable marking where applicable).
• Basic material and manufacturing considerations (forged construction and suitability for lifting use) and references to relevant mechanical performance classes.
• Compatibility/interchangeability guidance with other lifting components; ultimately superseded by a more comprehensive specification in ISO 2415.

Typical use and users

Users include manufacturers of lifting accessories, rigging and lifting equipment designers, inspection and testing organizations, procurement specialists specifying lifting components, and safety/maintenance professionals who need to verify dimensional compatibility and marking of dee shackles used in lifting assemblies.

Related standards

ISO 2731:1973 was superseded and technically consolidated into ISO 2415 (first consolidated edition published 1987). Subsequent revisions of ISO 2415 (2004 and later) continued to develop the requirements for forged dee and bow shackles. Other related or commonly referenced documents for shackle practice include regional and industry standards (for example EN/European standards and ASME lifting standards) that address performance, testing and additional product classes.

Keywords

dee shackle, D shackle, shackle, lifting accessory, forged shackle, interchangeability, ISO 2731, ISO 2415, lifting equipment, rigging

FAQ

Q: What is this standard?

A: ISO 2731:1973 is an International Standard that defined the form and principal dimensions of dee (D) shackles used as accessories for lifting equipment. It is a short technical specification originally published in December 1973.

Q: What does it cover?

A: It covered the definition, principal dimensions, dimensional tolerances and marking/identification matters necessary for dee shackles to be compatible and interchangeable within lifting assemblies. The standard did not remain current and was later consolidated into a broader shackle standard.

Q: Who typically uses it?

A: Manufacturers of shackles and lifting accessories, rigging engineers, procurement and inspection personnel, and safety/maintenance professionals concerned with correct selection and verification of shackles for lifting operations.

Q: Is it current or superseded?

A: ISO 2731:1973 has been withdrawn and superseded by ISO 2415 (1987) as part of a technical consolidation of shackle standards; later editions of ISO 2415 and subsequent revisions replaced those requirements.

Q: Is it part of a series?

A: ISO 2731:1973 formed part of the family of ISO standards on shackles and lifting accessories overseen by ISO/TC 111; its content was later combined into ISO 2415 and subsequent ISO 2415 editions.

Q: What are the key keywords?

A: Dee shackle, D shackle, forged shackle, lifting accessory, interchangeability, marking, ISO 2731, ISO 2415.