Engineers, what's this thing called?

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MikeG.

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It's a big fixing usually in stainless steel which is like a giant saw nut, circular but with a hex fitting, and the same on both sides. I want to connect a big oak beam to a stainless bracket by bolting through with an M18 threaded rod but without having any thread showing either side, just this neat round plate with a hex head.

Stupid thing is I have specified them before, can't find where, and can't remember the name of the fixing.
 
No, none of those. They look like flat round plates, just like giant saw nuts, but with a hex thingy in the middle.
 
Mike,

Do you mean something that looks like a serrated flange nut but attached to a wider plate like a timber connector

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ae235
 
MikeG.":4dy80qwl said:
but for some reason that has 2 additional holes in the face of the fixing...

The two holes appear to be for a pin spanner/wrench rather than your hex spanner.
 
Decorative head cap nuts?

can't post alink but google shows some images

or socket cap nuts.

The two hole ones are pig-nose nuts.
 
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