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What is S4 chain and is there an alternative?-gctid417487

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    What is S4 chain and is there an alternative?-gctid417487

    My rode is not the right size for the gypsy on the windlass. The specs on the Lewmar site say:

    10mm DIN 766, Campbell 3/8" S4

    The only S4 I could find is stainless at $30/foot! The rode and chain I have are 1/2" line and 1/4" chain, probably BBB. They gypsy isn't cheap either, so whatever I do to fix this is going to cost a bit. I'd rather replace the rode I think since it's the wear item in this scenario anyway.

    1?2" new england rope is a good choice, my 600' I purchased about 1995, still looks good.

    Chain number I do not know, go online and find a major chain dealer and call for expert info, you could call the manf. of the gypsy.

    Bayliner 3870 "ALASKA33)
    Twin 350 GM power
    Located in Seward, AK
    Retired marine surveyor


      Carlos, I think you answered your own question. The only reference I see to S4 chain is for stainless, high strength chain that is way expensive.


        Agreed - if you want stainless (S4) - it's going to cost. It's strong chain though (equivalent to High Tension)

        G4 is "high test" or a solid "medium" strength chain (stronger than BB) , but galvanized. And it's a WHOLE lot cheaper!
        1989 Bayliner 3270
        135hp (stock) -> 150hp (Injector pump mod) -> 170 hp (aftercoolers) Hino's
        MMSI 316 021 107
        Past Commander, Seymour Power and Sail Squadron
        Current instructor North Shore Power and Sail Squadron
        Vice Commodore BYC


          According to the nice folks at Suncor Stainless: (Here's a link to Suncor showing their part number for 3/8" DIN 766.

          --- DIN 766 is a European standard that corresponds very closely to BBB. 10mm is very close to 3/8".

          --- S4 is a stainless load specification that corresponds to G4 (grade 40) for non stainless chain.

          --- Campbell is the same as ACCO chain. It's made by the Peerless Industrial Group.

          Soyou could probably use hot dipped 3/8" BBB G4. G4 might be overkill for a 30' boat.

          But if you're only buying a leader for the rope rode, stainless chain is very nice to have on deck. Or put a 20' stainless leader on your galvanized chain attached with a flush pin shackle (Suncor).

          It's also a really good idea when buying a lot of chain to buy a short piece and test it in your windlass before getting a barrel of the stuff.
          100T MMC 2307794


            I called Lewmar for support, they were very helpful.


              I sent an e-mail to Lewmar just after posting here. He replied about 15 minutes later with some questions. I gave detailed answers and he immediately replied with the solution. Very very impressive support (not just on this, but many past times I've contacted them).

              The 002 gypsy will handle a 5/16" G4 chain and a 5/8" Medium Lay Three

              Strand Line.


              Lewmar Marine, Inc.

              Overkill for my boat, but it's what will fit the gypsy correctly.