ISO 4778:2019 PDF

Round steel short link chains for lifting purposes — Chain slings of welded construction — Grade 8

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Title (English):

ISO 4778:2019

Round steel short link chains for lifting purposes — Chain slings of welded construction — Grade 8

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 26
Publication date:: June 14, 2019
Edition:: ISO IS 4778 edition 2 version 1
ICS:: 53.020.30

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Description (English):

This document specifies the requirements, methods of rating and testing of single, double, three and four leg welded chain slings of grade 8 using components such as sling chains according to ISO 3076 together with links according to ISO 16798, hooks according to ISO 7597 and forged components according to ISO 8539. NOTE 1 For special lifting purposes not covered by this document, additionally intermediate links can be used, for example to connect components to each other having different working load limit. The range of nominal diameter, dn, covered by this document is from 4 mm to 45 mm. Chain slings according to this document are for use in the temperature range ?40 °C to +400 °C according to ISO 3056. NOTE 2 Concerning the use and maintenance of chain slings of grade 8, see ISO 3056. Chain slings according to this document comply with the general conditions of acceptance of ISO 1834 and are used for symmetrically distributed loads only. NOTE 3 For rating of chain slings with asymmetrically distributed loads, see ISO 3056. This document does not apply to mechanically joined chain slings. NOTE 4 For mechanically joined chain slings, see ISO 7593.

Technical details

Technical committee: ISO/TC 111/SC 1 - Chains and chain slings
SKU: ISO 4778:2019

Abstract

Overview

ISO 4778:2019 specifies requirements, rating methods and testing for round steel short link chain slings of welded construction - Grade 8. It covers single, double, three- and four‑leg chain slings built from compliant components (sling chains, links, hooks and forged components) and applies to nominal diameters dn from 4 mm to 45 mm. Chain slings under this standard are intended for use in the temperature range –40 °C to +400 °C and are designed for symmetrically distributed loads only. Mechanically joined chain slings are excluded.

Key topics and technical requirements

Scope and construction: Applies to welded chain slings of Grade 8 using components meeting ISO 3076 (sling chains), ISO 16798 (links), ISO 7597 (hooks) and ISO 8539 (forged components).
Component compatibility: Master links, intermediate links, joining links, end links and hooks must provide free articulation and be dimensioned to fit shank hooks and other terminal components (see Annex C).
Working Load Limit (WLL): WLL values and load factors for single- to four-leg slings (including angle effects) are provided; Annex A gives bases for calculation.
Mechanical testing: Proof load, manufacturing proof force (MPF), breaking force and static tensile testing of test sections are specified. Only authorized manufacturers or licensees may weld, heat‑treat or test slings.
Dimensional tolerances and assembly: Nominal reach tolerance of +2/0 chain links; after proof loading, leg length differences under 20% WLL are limited (≤10 mm for legs ≤2 m; increases authorized for longer slings).
Marking and certification: Requirements for marking and manufacturer’s certificates are included to enable traceability and conformity assessment.
Limitations: For asymmetrical loading, maintenance and special rating see ISO 3056; mechanically joined slings refer to ISO 7593.

Practical applications and users

ISO 4778:2019 is intended for organizations and professionals involved in lifting and rigging, including:

Chain manufacturers and licensed fabricators (welding, heat treatment, testing)
Rigging engineers, lifting equipment designers and safety officers
Inspection bodies and test laboratories
Procurement and asset managers in construction, shipping, offshore, manufacturing and heavy industry

Use cases include design, fabrication, verification and in-service inspection of Grade 8 welded chain slings for cranes, hoists and other lifting systems where robust, high-strength chain slings are required.

Related standards

ISO 3076 - Sling chains (Grade 8)
ISO 16798 - Links of Grade 8
ISO 7597 - Forged steel lifting hooks (Grade 8)
ISO 8539 - Forged lifting components
ISO 3056 - Use and maintenance; asymmetrical load rating
ISO 7593 - Mechanically joined chain slings
ISO 1834 - General conditions of acceptance

Keywords: ISO 4778:2019, chain slings, Grade 8, welded construction, round steel short link chains, working load limit, WLL, rigging, lifting standards.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

Scope and construction: Applies to welded chain slings of Grade 8 using components meeting ISO 3076 (sling chains), ISO 16798 (links), ISO 7597 (hooks) and ISO 8539 (forged components).
Component compatibility: Master links, intermediate links, joining links, end links and hooks must provide free articulation and be dimensioned to fit shank hooks and other terminal components (see Annex C).
Working Load Limit (WLL): WLL values and load factors for single- to four-leg slings (including angle effects) are provided; Annex A gives bases for calculation.
Mechanical testing: Proof load, manufacturing proof force (MPF), breaking force and static tensile testing of test sections are specified. Only authorized manufacturers or licensees may weld, heat‑treat or test slings.
Dimensional tolerances and assembly: Nominal reach tolerance of +2/0 chain links; after proof loading, leg length differences under 20% WLL are limited (≤10 mm for legs ≤2 m; increases authorized for longer slings).
Marking and certification: Requirements for marking and manufacturer’s certificates are included to enable traceability and conformity assessment.
Limitations: For asymmetrical loading, maintenance and special rating see ISO 3056; mechanically joined slings refer to ISO 7593.

Practical applications and users

ISO 4778:2019 is intended for organizations and professionals involved in lifting and rigging, including:

Chain manufacturers and licensed fabricators (welding, heat treatment, testing)
Rigging engineers, lifting equipment designers and safety officers
Inspection bodies and test laboratories
Procurement and asset managers in construction, shipping, offshore, manufacturing and heavy industry

Related standards

ISO 3076 - Sling chains (Grade 8)
ISO 16798 - Links of Grade 8
ISO 7597 - Forged steel lifting hooks (Grade 8)
ISO 8539 - Forged lifting components
ISO 3056 - Use and maintenance; asymmetrical load rating
ISO 7593 - Mechanically joined chain slings
ISO 1834 - General conditions of acceptance

Keywords: ISO 4778:2019, chain slings, Grade 8, welded construction, round steel short link chains, working load limit, WLL, rigging, lifting standards.

ISO 4778:2019 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Practical applications and users

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Practical applications and users

Related standards

Related standards

Short link chain for lifting purposes — Grade T (8), non-calibrated, for chain slings etc.

Links of Grade 8 for use with slings

Forged steel lifting hooks with point and eye for use with steel chains of grade T(8)

Forged steel lifting components for use with grade T(8) chain

Non-calibrated round steel link lifting chain and chain slings — Safe use and maintenance

Chain slings assembled by methods other than welding — Grade T(8)

Short link chain for lifting purposes. General conditions of acceptance