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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.
 

banjerbill

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Mike,
Do you mean a flange nut or do you want a dome nut to completely cover the thread?

Bill
 

MikeG.

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No, none of those. They look like flat round plates, just like giant saw nuts, but with a hex thingy in the middle.
 

Brandlin

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Mike,

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



 

CHJ

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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.
 

MikeG.

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I've left my glasses out in the workshop, so I can't be sure you're right. It sounds plausible, though.
 

fatbob

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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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