Prices of Keys for Ring Nuts?

Is this what you are looking for?

I Know this as a castle nut and cotter key or cotter pin.

Very cheap (pennies)

The ring nut is the nut showed in the picture. Usually there is used a carpenter's hammer to screw it, but there exist special keys that my supplier asked me to use.

Here in Montevideo only one person knew what I was talking about

I need the key, not the nuts.

The only thing I could find was this:

or these:

and no mention of any key. (searched on McMaster-Carr)

I've always used a screwdriver or pry bar to tighten these. I would think that the supplier of the nuts should know about any special key, and I can't imagine the key costing more than $US 10 or 20.

Sorry I couldn't be more help.

¿Qué significa ATS? Supongo que cabeza de martillo significa que la cabeza del perno tiene unos dientes que se entierran en el metal al martillarlo. ¿Es así?

Dick

Hola Dick

Gracias por tu ayuda. Creo que ATS es el nombre del sistema simplemente (Alu-Top System) Perno cabeza de martillo lo entiendo como un perno cuya cabeza puede ser golpeada, considerando que otros pueden deformarse y quedar inutilizados.

The drawings were taken from some brochures I got searching in the internet for "tuerca de argolla". The machine I will be working with is a backhoe excavator.

If it's that urgent you could make your own while you wait for the stock items to come in. If you find a couple of old sockets having the right ID/OD and then file or grind them down to suit your ring nuts.

Surely any piece of round steel bar that will fit the ring would do the job?

What about a 'pipefitter's carrot', being a tapered conical metal bar that can be used to lever the bolt holes in adjacent flanges into line? Wouldn't that do?