Mark, A bit of a chain primer might shed some light on this. Many boaters think chain is just chain.
However, chain isn't just "chain". Chain is designated by both size and type. Size can even be US or metric. There are several different types of chain. Chain can be designated BBB, proof coil, G3, G4, G34, S4, HT (high test), transport, AlloyGr80, AlloyGr100 and other types. Some of these types are just different names for the same chain. Each chain type has different dimensions, even for the same size. Different grades have different strengths. For instance, 5/16 G4 is stronger than 3/8 BBB. Also, windlass gypsies are made for certain size and type of chains. They don't like other chains. Commonly, anchor chain is usually BBB, G34 or G4. High end boats may use S4. So, you may have a chain different than what you think. Go here: <http://www.1st-chainsupply.com/index_chain.htm> On the left you will see a link called "Reference" then a second link called "Chain Data". Selecting one of the chains may help you identify which chain you have and then help you select a shackle. Dennis C. Touche' 35-1 #83 Mandeville, LA On Mon, May 12, 2014 at 12:52 PM, Dr. Mark Bodnar via CnC-List < cnc-list@cnc-list.com> wrote: > > Needed to replace the chain and shackles on my anchor - the existing > shackles needed to be cut off with a cut-off blade (totally corroded). > > Bought 16' of 5/16 galv chain to add to connect the 27lb Kingston plow > anchor and the ~250ft of 5/8" rode. > But I was surprised to find that I couldn't fit the U of a 3/8" shackle > (or even a 5/16") through the 5/16 chain. Everything I read said I should > bump up the shackle one size from the chain to maintain working strength - > but given I couldn't fit the ends of the U through the chain links I had to > use 2 shackles on the anchor --- one with the pin through the anchor and a > second shackle reversed with the pin through the chain link. > > Is that normal? I tried chain a 2 different locations with same results > > Mark > > -- > > > There is no cure for birth and death save to enjoy the interval. > - George Santayana > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com >
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