BS ISO 1704:2022

What is ISO 1704 - Stud-link anchor chains about?  

Stud-link anchor chains provide a mechanism for ships and boats to hold their position during berthing and mooring operations to remain stationary. 

ISO 1704 specifies the shape, proportions, dimensions and tolerances of the component parts of stud-link anchor chains. Statutory requirements, rules and regulations can apply to the individual ships concerned. 

ISO 1704  discusses terms, definitions, shapes, dimensions, tolerances, grade of the anchor chain, connections, designation of the size, material requirements, loading methods and marking. 

Who is ISO 1704 - Stud-link anchor chains for?  

ISO 1704 on stud-link anchor chains is useful for:  

• Marine and shipbuilding industry   
• Manufacturers and suppliers of stud-link anchor chains 
• Water transport engineering component manufacturers  
• Marine engineers   
• Structural designers  
• Installers  
• Port authorities  
• Regulatory bodies  

Why should you use ISO 1704 - Stud-link anchor chains? 

The anchor grips onto any rocks or debris at the bottom of the ocean or sea, to provide a pivot for the vessel to remain stationary. There are certain standardized specifications contributing to the performance of stud-link anchor chains. They are also capable of increasing the drag of a vessel in a required situation. When trailing behind a ship, they serve as an artificial drag mechanism. 

ISO 1704 discusses terms and definitions that depict a user-friendly idea of stud-link anchor chains. ISO 1704 also provides users with shapes, dimensions, tolerances and material requirements which contribute to the performance characteristics of stud-link anchor chains ensuring their reliability. The guidelines in

ISO 1704 help you perceive the loading method of stud-link anchor chains ensuring their sustainability, which enables you to provide a superior quality product to your customers.  

What’s changed since the last update? 

BS ISO 1704:2022 supersedes ISO 1704:2008. BS ISO 1704:2022 includes some technical changes with respect to ISO 1704:2008. These include:  

• Grade 4 stud-link anchor chain with higher strength has been defined in Table 1 and mechanical properties have been specified in Clause 9 
• The terms and definitions of swivel shackles have been added in 3.8 
• Tolerances on the nominal diameter of the links have been adjusted properly in Clause 5 
• The nominal dimensions of the enlarged link, end link, D type joining shackle and Kenter type joining shackle have been adjusted properly in Tables 3, 4, 5 and 6 
• The nominal diameters and shape of Type A and Type B swivel shackles have been added in 7.9 and 7.10 
• The sketch examples of connecting chain-shots with joining shackle and examples of connecting outboard chain-shot to anchor and chain end shot have been added in Figures 11 and 12 
• Information on requirements for anchor chains, designation of size, material requirement, loading methods and marking has been added in Clauses 8, 9 10 and 11 
• Incorrect dimensions in Table 3 of ISO 1704:2008 have been corrected