... : Open and Stud 3. Certificates:CCS, ABS, etc. Mooring Chain Originally studs were added to the chain to stiffen the links preventing them ... , thus avoiding problems when chain is retrieved with a windlass.1. Material: U1, U2, U32.Certificate: CCS, ABS, LR, GL, DNV, NK ... .20kn - 1264.20knBreaking Load: 82.60kn - 2528.40knU3 Open - Link Chain:Proof Load: 56.40kn - 1768.90knBreaking Load: 112.80kn - 3537 ...