BS ISO 13755:2020 pdf download – Ships and marine technology — Ship’s mooring and towing fittings — Steel rollers
1 Scope
This document specifies the types, nominal sizes, dimensions and materials, as well as construction,manufacturing and marking requirements, for steel rollers installed to lead the mooring rope of a ship.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 13767, Ships and marine technology — Ship’s mooring and towing fittings — Shipside roller fairleads
ISO 13776, Ships and marine technology — Ship’s mooring and towing fittings — Pedestal fairleads
IMO Circular MSC/Circ.1175, Guidance on shipboard towing and mooring equipment
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at
— IEC Electropedia: available at
safe working load
safe load limit (maximum permissible load) of the fittings used for mooring and towing
4 Classification
4.1 Type
Depending on the construction, steel rollers shall be classified as belonging to one of the following three types:
a) Type A: made of steel casting without upper dust cover;
b) Type B: made of steel casting with upper dust cover;
c) Type C: made of steel plate with dust cover.
4.2 Nominal sizes
The nominal sizes, D n , of steel rollers are denoted by reference to the outside diameter of the roller, in millimetres, from a basic series of preferred numbers.
The nominal sizes are: 150, 200, 250, 300, 350, 400, 450 and 500.;BS ISO 13755 pdf download.