chaine ,je savais pas

je vais essayer
merci du renseignement mais après 20ans de mer et apprendre ça tu te dis que quand même il y a des choses pas normale, André

Bon
je renonce à résumer les normes US utilisées dans une bonne partie du monde: Proof-coil ou BBB ou High-Test, en grade 30 ou 40 ou 43, norme Imperial ou norme ISO

Juste cela peut-être

GRADE 30 “BBB” CHAIN This is the shortest
link chain available for anchoring. Its short
links work best on a windlass’s wildcat drums,
and BBB (or triple-B) chain weighs somewhat
more than proof coil, making a bigger catenary
curve when deployed (Figure 23-2). Made
from carbon steel with a tensile strength of
55,000 psi (380 MPa), BBB is stamped with 3B
or BBB, depending on manufacturer, in sizes
from 5/16 inch (8.73 mm wire dia.) up.

GRADE 40 “HIGH TEST” CHAIN Suitable for
marine anchor use, this chain is hot-dip
galvanized. Grade 40 was originally a designation
used exclusively by ACCO Chain. This
is somewhat confusing, because the majority
of the chain industry uses grade 43 for this
chain strength. Grade 40 and grade 43 chain
are of high-carbon steel with a tensile strength
of 85,000 psi (585 MPa). It is stamped with G4,
G40, or G400, depending on the manufacturer,
in sizes from 5/16 inch (8.4 mm) up.

Copier-coller de D. Geer, BOAT MECHANICAL SYSTEMS HANDBOOK, INTERNATIONAL MARINE / McGRAW-HILL, 2009
p. 350

N'ayant jamais eu de guindeau....
car je relève mon mouillage à la bouée, j'ignorais aussi....décidemment l'adage ''pourquoi faire simple quand on peut faire compliqué'' a encore de beaux jours devant lui !

encore merci pour l'info
voila je vais faire attention surtout qu'il me faut 80 m de 10