Special nuts: Any name to what I may need?

Hi. I need to bolt on a 25mm square bar to the side of something. An M6 stud protrudes from a surface and that will go through a hole made in the square tube. But, I have a small problem: The stud is rather short, it does not protude beyond the surface of the tube, so I cannot use a regular nut on the stud.

I need something like a thumb screw, which will recess into the tube and make contact with the stud. The length of the shank of the thumb screw needs to be 25mm or so. I've not yet found a suitable thumb screw. If not a thumb screw I need something very similar, perhaps with an hexagonal head. Do such things exist? Things like thumb screws, but with hexagonal heads? Thanks. Rich

You could open the top hole and use a regular nut tightened with a socket

Sleeve nut, barrel nut and Joint connector would be suitable searches

Sorry, thinking of box section. You could always counterbore the bar and fit a nut in the recess

How about a joint connector nut

www.screwfix.com/p/joint-connector-nuts-m6-x-17mm-50-pack/83521

www.screwfix.com/p/joint-connector-nuts-m6-x-12mm-50-pack/83501

Robert G8RPI.

JasonB beat me to it!

Hi. Sorry, I said "bar" at one point, and meant to say "tube". Or perhaps it's better to say "box section". Also, the stud is M8 not M6. Thanks for the suggestions. I know what I would do if I had a lathe and M8 hexagonal threaded spacer - I'd turn the spacer just leaving the end as the hexagonal head. Now Googling for "Joint Connector Nut M8". Sleeve part of nut needs to be about 25mm long. Don't think I'll find one at 25mm

Edited By Richard Rogalewski on 11/01/2020 13:10:34

Edited By Richard Rogalewski on 11/01/2020 13:23:14

My best search result:

M8x22 Sleeve nut

According to my drawing, which is a drawing of a machine I have, so measurements are by way of my using a ruler to measure distances, if the sleeve is 22mm long, which I belive it is, the sleeeve nut will screw into the stud 5mm. That ought to be enough, because the box section I'm attaching is only being held in place, it's not taking a load.

Edited By Richard Rogalewski on 11/01/2020 14:25:30

At 5mm you wont have much holding it. The stud will be tapered to allow the cutter to start the thread and the nut likewise

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It should be quite easy to make a good sleeve nut from a long M8 hex socket screw [which will have a suitable length of plain shank].

MichaelG.

M8x30 Barrel Nut TORX

Probably OK for length. 5 for £9.99

Actually, in it's simplest incarnation all I need is threaded sleeve rod/spacer, that screws into the stud, and I attach the box section by screwing into that sleeve an M8 screw.  Probably my cheapest option.

Edited By Richard Rogalewski on 11/01/2020 23:01:07

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Oops ... Just noticed your increase from M6 to M8

Please increment my suggestion accordingly.

’though I think Richard’s find trumps it anyway.

MichaelG.

OK, I just bought 5x M8x40 threaded spacer for £3.50. I'll just use a spacer and an M8 hex screw. Might even try to weld the screw to the spacer. So, that's about it for this thread. Rich