This is a common yacht fitting for bimini tops etc. in stainless steel. However, they are typically not threaded and are held in place with a grub screw. Also, the ID is to match TUBE not pipe. Still, you might be able to work with something like this:
Nothing so far quite matches up, but the SS top caps with 1" socket diameter could fit on a 3/4" pipe (1.05" o.d.) by grinding or turning down a little on the end of the pipe. Tapping the top cap socket could also work, but it may be difficult to grip the top cap hard enough without marring it.
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If you are on the Gulf, there will be plenty of these things close by. West Marine sell them. Look for a shop that does sail repair, bimini tops, dodgers, sailcovers, cockpit cushions. You don't need to send away for it.
In lieu of a cotter pin or bolt, consider a roll-pin. They come in the right diameters and lengths for this, with maybe just a bit of grinding, and won't leave any projections.
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What kind of load is it handling? Does it need to conform to any spec."?
If not, perhaps just take standard 6" nipple... heat one end to plastic state, and flatten heated end in a vise... (or hammer/blacksmith) then quench, temper & harden as necessary. (drill eye hole in flate end before hardening)
I use a similar design when building custom backdrops for trade shows, & usually make my own.
Take a standard 3/4" threaded pipe cap & drill a hole in the top center. Insert an eyebolt and secure with nut, flat washer & lock washer (or jam nut) on each side. All the material is available in most hardware stores.
Total cost: ~ $2.50.
Total labor: ~5 minutes.
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but not threaded... as I understood the OP needed a high pressure cap that can also have a lifting lug. so I understood it to require pipe threading. Are you saying that you can put a female pipe thread on that #11 thing or what am I missing. It is for fencing, not piping...
There will be three sets of these Eyelets, each with a 6" turnbuckle and with a tiny 1/8" dyneema line 24' in length joining one to another ( 6 pieces all total).
There will be about 35 kg ( not lbs.) of pressure on the eyelet when set.
( not exact but all I could do is guess with a Viking scale and wire clamp for a test).
The fit can be sloppy ..... just so it does not pull off. The pin through the eyelet cap #11 has to hold 35 kg. of pressure. If not, I will go to the threaded pipe cap and eye bolt suggestion.
Thnak you again.
nm
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Netmaker check with your local canvas awning supplier. They use a similar piece to connect awning framework (3/4" or 1" steel pipe) to building structure.
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