Chain size for a Simpson and Lawrence 500 Manual Windlass?

[SHUG]

I have a Simpson and Lawrence 500 manual windlass which dates back to the fifties but is in great condition.
The reference number on the maker's plate is 500/343 and the chain gypsy has the numbers 500 and 22 cast into it.
The distance between the ridges in the gypsy is about 41mm or 1.6inches.
I have tried in vain to find chain which matches the gypsy.
Can anybody help to pair this gypsy with a matching chain?
Thanks

 

[SHUG]

It's a bit sad when you reply to your own post but I have made some progress.
I went to the excellent Cox engineering site athttps://coxengineering.sharepoint.com/Pages/Chaindefinitions.aspx and found from the chain dimensions listed there that the appropriate chain is either 8mm where the spacing would be 40mm or 1/4inch (7mm) where the spacing would be 39.4mm.
Now to get some chain and check it out.
(Talking to yourself can be quite therapeutic!!)

 

[basic]

Think you will find it is 8mm.

 

[KristiferColumbus]

Think you will find it is 8mm.

Seems unlikely with a British built & designed winch from the fifties. We did'nt change over to the metric system till the seventies & some of us still don't trust it even now

 

[vyv_cox]

Think you will find it is 8mm.

In the past I have found that 5/16" and 8 mm are pretty much interchangeable. I had an anchor chain that was a mixture of the two, joined with C-links that were neither, all of which passed through the gypsies of both windlasses I owned.

 

[reeac]

It's a bit sad when you reply to your own post but I have made some progress.
I went to the excellent Cox engineering site athttps://coxengineering.sharepoint.com/Pages/Chaindefinitions.aspx and found from the chain dimensions listed there that the appropriate chain is either 8mm where the spacing would be 40mm or 1/4inch (7mm) where the spacing would be 39.4mm.
Now to get some chain and check it out.
(Talking to yourself can be quite therapeutic!!)

Remove the gypsy and take it along to the chain vendors to find the best match. That's what I did some years ago.

 

[galeus]

http://www.slspares.co.uk/

Have a look here, if they can't help perhaps they can advise you.