Thread in wooden ceiling/beam? For hanging chair.

[Box of rain]

Is there any type of thread/screw sleeve you can insert into ceiling joists that has internal machine threads like M8, M10 and can support a hanging chair with about 60 kg load? I thought it might be nice to be able to remove the hooks easily and have some sort of cover plug in the holes if the chair is no longer going to be used.

 

[findus42]

Complicated detour.
If you place a

directly in the rule, the hole can be plugged later.
Best regards, Findus

 

[Box of rain]

Complicated detour.
If you put a
[image]
directly in the rule, you can plug the hole later.
Regards, Findus

Sure, it's definitely complicating things a bit. But the question was whether the possibility exists.

 

[Gabbe1]

Something like this would work.

 

[daugaard]

Drill 8mm and drive in your M10 directly into the wood.

 

[Robert-san01]

I think it's a Rampamuff you're looking for.

https://www.bauhaus.se/rampamuff-m8

 

[jonaserik]

Would never put a machine screw in a ceiling joist and expect it to hold 60 kg, not enough thread size to bite into the wood. Machine screw threads are fine and dense. Doubtful that a so-called rampamuff would hold, it is too short to grip the wood. It works with a trapezoidal hook as mentioned in #2 and a little plastic plug in the hole when the hook is removed.

Edit. The one shown in #4 leaves 3 holes in the ceiling, hard to make it look nice upon removal.

 

[Höghus]

Rampamuff M10x40 might work.
Or not.

https://www.ebay.de/itm/154938578558

/Höghus

 

[tommib]

From which sides can you access the roof joists?

If you can access them from above, you can install a T-nut or a fastener plate as shown in #4 from above. This way, you have the entire joist providing resistance, not just a few threads.

If you can access them from the side, you can recess a square nut with a larger square washer from the side (at the top of the joist).

I still think the answer you got from findus42 is the easiest and will look the best when you remove it.

 

[jonaserik]

Rampamuff M10x40 might work.
Or not.

[link]

/Höghus

Yes maybe but they need to go far into a beam to avoid the wood splintering. Otherwise, you can use a through-threaded rod 8 mm with a washer and nut on the top side. Of course, if there's a floor on the next level, that's not ideal either.

 

[Höghus]

Yes, maybe but they must go far into a beam to avoid splitting. Otherwise, an 8 mm threaded rod with a washer and nut on the top side can be used. Of course, if there's a floor on the next level, it's not good either.

If machine threading is a requirement, just drill as deep as you can and fill the hole with rampamuffar. Some adjustment will be necessary for the threads to align at the joints.
Not something I would do myself, but not impossible.

/High-rise