Chain size
- Thread starter PJHoffnet
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sunchaser
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Recommend to the Chain Supply website where all manners of a plethora of link sizes and dimensions are shown. Even though it appears you've got 1/4" G4 pays to go to the source.
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sunchaser
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Shrew you may well be right or?? That is why a visit to the 1st Chain Supply website is in order. Link dimensions in their entirety are noted so the visibly challenged by the internet have 4 different dimensions noted to pin down the precise link size.
That's 5/16. The calipers are showing 0.350 bar size, way too big for 1/4 and too small for 3/8. 5/16 is nominally 0.312 but most specs show it up to 0.330 or so. Add some zinc and corrosion.
G4 is just the grade, indicating high test G40 spec. G30 not usually marked, G40 and 43 usually marked "G4", G70 usually not used in anchoring systems but normally also marked.
G4 is just the grade, indicating high test G40 spec. G30 not usually marked, G40 and 43 usually marked "G4", G70 usually not used in anchoring systems but normally also marked.
OP
OP
PJHoffnet
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Using the chart from 1st chain supply I'm going with 5/8" ... but the truth will be in the links per foot (will measure Saturday when I'm on the boat). It's the one measurement where there's really an easy to see difference I think.
McGillicuddy
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Based on this chart, the 3/8” chain I bought is actually 7/16”
Hmmm.
Hmmm.
C lectric
Guru
To me both the tape and the caliper are out of line enough to make the measurements questionable.
The second photo of the caliper looks like 5/16 based on the contact of the jaws reduced thickness area on the link partly out of sight.
Is that chart for G40/43 chain? If the chart is for another type of chain then the chart is not applicable.
The second photo of the caliper looks like 5/16 based on the contact of the jaws reduced thickness area on the link partly out of sight.
Is that chart for G40/43 chain? If the chart is for another type of chain then the chart is not applicable.
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OP
OP
PJHoffnet
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The chart is for G4 chain - which is what I have. Here is the source on 1st Chain.
My best guess is still G4 5/16. Trying to find a break to run out to the boat to do the links/foot - that will be the real teller I think since the values are so different.
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Flip the caliper over and measure the ID and subtract that from the OD then divide by 2. Or measure one foot of length and count the links. Also use the caliper to sample along the chain for stretch or wear. Anything more than 10% get a new chain.
OP
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PJHoffnet
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I'm gonna go with 5/16 G4 ... finally remembered to take a 1 foot pic yesterday. Pretty close to 11.7 links/foot ... certainly not 14.2 or 9.8.
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gilbertpark
Senior Member
Please could someone post the Chain Supply website url. Tried Googling it but I just get thousands of hits about business chain supplies! Hopefully, they have a metric table as well for us poor Europeans!
Gilbert
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The other thing to check is to simply look at the Gypsy. The chain size should be stamped right on it. On Lewmar gypsy's you should see it on the chain/line side. Some, you need to remove and read from the bottom.
The PO of my boat had 3/8" G4 on a 5/16 gypsy. It jammed frequently and beat up the gypsy and the chain. It may be safer to go with what the gypsy specifically says, or replace the gypsy and chain together.
The PO of my boat had 3/8" G4 on a 5/16 gypsy. It jammed frequently and beat up the gypsy and the chain. It may be safer to go with what the gypsy specifically says, or replace the gypsy and chain together.
Yep, sometimes it's hard to find, covered over in mud or gunk, or stamped very small, but it's there, somewhere. On Maxwell's it's a three digit code, then you just look it up.
OP
OP
PJHoffnet
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Thanks, I've heard this advice also ... I have a old Lewmar that I can't even figure out what model it might be, and have never been able to see anything 'stamped' on the visible surfaces. Thanks for mentioning it might be stamped someplace 'unseeable' - I certainly would have never thought of that. I'll take a look from the chain locker next time I'm at the boat.
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1) put a line on the anchor to retain it.
2) Pay out some rode
3) lift the chain from teh gypsy
4) Remove top cap
5) Remove the gypsy
6) Look on the bottom of the gypsy. I would assume you would see it there unless the chain is sitting on top of it.
It should only take a few minutes.
