ISO 16856:2013

INTERNATIONAL ISO
STANDARD 16856
First edition
2013-12-15
Ships and marine technology — Loose
gear of lifting appliances on ships —
Hooks
Navires et technologie maritime — Accessoires mobiles des appareils
de levage sur les navires — Crocs
Reference number
©
ISO 2013
© ISO 2013
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ii © ISO 2013 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Types . 1
4.1 Common hook types . 1
4.2 Other types (E-shaped) . 1
4.3 Model designation . 2
4.4 Locking device requirement . 2
5 Technical requirements . 2
5.1 Materials . 2
5.2 Forging and heat treatment . 3
5.3 Surface and internal quality of hooks. 3
5.4 Tests . 3
5.5 Inspection . 4
5.6 Other requirements . 4
6 Marking . 4
7 Storage and transportation . 5
8 Use and maintenance . 5
Annex A (informative) Types and basic parameters of common hooks . 6
Foreword
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The committee responsible for this document is ISO/TC 8, Ships and marine technology, Subcommittee
SC 4, Outfitting and deck machinery.
iv © ISO 2013 – All rights reserved

INTERNATIONAL STANDARD ISO 16856:2013(E)
Ships and marine technology — Loose gear of lifting
appliances on ships — Hooks
1 Scope
This International Standard specifies the types and basic parameters, technical requirements, marking,
storage, and transportation, use and maintenance of hooks as loose gear of lifting appliances on ships.
This International Standard is applicable to lifting appliances on ships.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 1837, Lifting hooks — Nomenclature
ISO 16855, Ships and marine technology — Loose gear of lifting appliances on ships — General requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 16855 and ISO 1837 apply.
4 Types
4.1 Common hook types
4.1.1 Shank hook with point (S-shaped)
For the shapes and dimensions of a shank hook with point, see A.1.
4.1.2 Shank ramshorn hook (D-shaped)
For the shapes and dimensions of a shank ramshorn hook, see A.2.
4.1.3 C-hook (C-shaped)
For the shapes and dimensions of a C-hook, see A.3.
4.2 Other types (E-shaped)
Types of hooks in ISO 1837 other than common hook types that can also be used as ship hooks fall under
E-shaped.
4.3 Model designation
Figure
EXAMPLE Designation of a shank hook with point with 20 t SWL:
Hook ISO 16856 H-S20
4.4 Locking device requirement
Various types of hooks shall be provided with automatic locking devices.
5 Technical requirements
5.1 Materials
5.1.1 Hook materials must use solid steel manufactured by Martin furnaces, electric furnaces, or oxygen
top-blown converters; it is recommended to use the electroslag remelting process.
5.1.2 For the chemical composition of hook materials, see Table 1. Other materials can be used (see
5.6).
Table 1 — Chemical composition of hook materials
Chemical composition (heat analysis)
%
Materials
C Si Mn P S Cr Al
Carbon steel 0,17–0,24 0,17–0,35 0,45–0,80 ≤0,035 ≤0,035 ≤0,030 ≥0,025
Carbon-man-
0,17–0,24 0,20–0,35 1,20–1,50 ≤0,035 ≤0,035 ≤0,030 ≥0,025
ganese steel
5.1.3 For the mechanical properties of hook materials, see Table 2. Other mechanical properties can be
used (see 5.6).
2 © ISO 2013 – All rights reserved

Table 2 — Mechanical properties of hook materials
Mechanical properties
Tensile Impact
Yield point
strength Elongation A energy
R
eH
R % A
m K
MPa
Materia
...