I know i have seen a type of bolt but i don;t know what it’s called or where to buy it..

A threaded bolt (probably cap head/ hex head) but the tip has a captive rotating plate.

Any ideas what they are called, or even where thay are used.

Please help….

Have you tried doing a Google Images search ? – might spot something that’s close without having to get the name exactly right.

Do you mean a captive washer under the bolt head, or at the thread end of the bolt, like a levelling foot?

Have you tried doing a Google Images search ?

yep – not even close – yet..

at the thread end of the bolt.

it’s not so much a foot – as the bolt still fits through it’s standard hole. eg m8.

What would it’s purpose be? The only thing I can think of that would be close to that is a set screw with rotating tip – normally a ball bearing or brass/plastic insert in the end.

What are you trying to do with it?
Might help narrow it down like.

http://m.laxmifastener.com/fischer-fastner.html

it’s pushing against a plate – the bolt is to set the position of the plate.

The bolt is digging in to the plate (it’s stainless) – i thought that one of those screws with the ‘spinny tip’ would help. but bugger me i don’t know what they are!!

It sounds a little bit like a variation of this sort of thing which is an adjustable or levelling foot.

You turn the bolt which freely turns in the plate.

Think what your looking for is a toggle clamp stud. Quick google shows one in images

Can’t see.one in its raw form in the uk. But suggest a toggle clamp and strip out the stud and end

https://www.amazon.com/JW-Winco-Stainless-Assembly-Diameter/dp/B00G5754D0

Ball and socket levelling mount???

http://www.vibrasystems.com/product/leveling-mounts-feet/b-series-steel-ball-and-socket.html

I reckon you are thinking of this ??? The blind bolt