Soft Metal Joints Standards

Please clarify a bit more what you are asking, I'm having a hard time figuring out exactly what is is you are after.

"hydraulic joint" is a very vague term and could mean thousands of things. What type of joint?

Is the washer acting as your seal? is it a dynamic seal, or a static seal?

etc etc etc...

Please advise.

-R

Sorry i'll try to be more specific.I have two steel pieces with a drilled channel must continue from a piece to the other.Both pieces ends flat as flange.I don't trust on the surfaces plan as enough to avoid leackage,so an aluminum washer in a hub rounding the hole rising a little whit from plan surface wil be the gasket.I saw that several times in hydraulics and diesel injction sistems, in fact i imagine few others applications for annealed copper washers in which you just tight without specific limit.Here when the two flat plans touchs each other is the limit.There is a rule for plastics:compress the 10% of its height,5% if it is ptfe.Al,Cu?Sorry my english.It is a static high pressure seal.-

When you say "high pressure" what do you really mean? To me, "high pressure" can mean anything over 3000PSI (industrial hydraulics). What are your pressures/flows? What is your fluid?

Most flanged joints I use are all equipped with an o-ring groove on one face, and a machined flat surface on the other flange. The O-ring creates the seal. I have however seen copper/brass washers doing the same thing, but I have not seen this in many years, mostly due to machining and O-ring technology improvements.

Without knowing pressures, chemical compatibilities, flows, materials etc i cannot really give any advice.

Thanks anyway.Exactly that.For any reason i don't want use rubber o'ring i want use aluminum washer but it needs (same than o'rings) an exact depth of grooves that you obtain from o'rings manufacturer, Parker for example.In case of aluminum or annealed copper i don't have any information and i couln't get it.Still are often used as seals but more commonly out of grooves and compressed after techinician will.I'll take 5% of its heigth.Thanks again.-