All the Nautilium chains purchasable on this website are factory tested link by link. In the case of the calibrated chains of the NAUTILIUM 4 and NAUTILIUM 7 lines, additional specific RINA (Italian Naval Register) test certification can also be requested.

In this case, a special mark is punched on the two end links of the piece of purchased chain. This special indelible mark impresses the Rina (RI) symbol on the steel. This code represents the chain grade and a number identifying the production lot which is also indicated on the chain test certificate (signed by the manufacturer and by the Rina) and permits fully tracing the product over the years. Purchasing an NAUTILIUM CERT line product means being able to count on a double reliability and safety warranty also valid in international contexts and with insurance companies.