Stainless screw when fastening to the ceiling?

[joasag]

Just installed a 2m long hanging ceiling shelf. It was screwed into studs I reinforced in the attic. Seems to be holding very well, but I started thinking that stainless steel screws might be a bit more brittle? Chose stainless because they look better when visible.

Test mounted everything and then took it down, discovered that some screws were bent. This is probably better than them breaking.

The screws were bought at Bauhaus as loose weight and are wood screws.

What screws do you recommend instead?

 

[Kane]

For indoor use, most materials and surface treatments work fine. The nicest looking one wins. What are you worried about?

 

[fribygg]

Just set up a 2m long hanging ceiling shelf. It was screwed into beams I reinforced in the attic.
Seems to be holding up really well, but I started thinking that stainless steel screws might be a bit more fragile?
I chose stainless because they look better when they are visible.

I test-mounted everything and took it down, then noticed that some screws were crooked. However, this is probably better than them breaking.

The screws were bought at Bauhaus in bulk and are wood screws.

What screws would you recommend instead?

Are you planning to load the shelf with heavy weights?

 

[joasag]

No, but the shelf itself probably weighs 25kg. Attached at 6 points with 3 screws at each point.
So, there's nothing to worry about, that stainless steel screws are more fragile?

 

[fribygg]

No, but the shelf itself probably weighs 25kg. Attached at 6 places with 3 screws at each place.
So there's nothing to worry about, that stainless screws are more brittle?

I would think each screw carries more than 100kg, so you have 18 screws.

 

[vectrex]

I would guess that each screw carries more than 100kg, so you have 18 screws.

Matthias Wandel recently tested and an ordinary drywall screw holds about 200kg before it pulls out of the wood.

I guess you are using significantly thicker screws than drywall screws, so assuming 500kg per screw is probably not an exaggeration.

In that case, you have screws that can hold 9 tons (but something else is likely to break first).

 

[joasag]

Matthias Wandel recently tested and a regular drywall screw can withstand around 200kg before it is pulled out of the wood.

I guess you're using significantly thicker screws than drywall screws, so assuming 500kg per screw is probably not an exaggeration.

You then have screws that can withstand 9 tons (but something else will likely break first).

That was more than I expected! Well, I think the screw I'm using is similar to a drywall screw but a bit denser and not as coarse threads. However, about 70mm, of which 60mm fasten in the wood.

 

[fribygg]

That was more than I expected! Well, I think the screw I'm using is roughly like a drywall screw but a bit denser and with not as coarse threads. However, about 70mm, of which 60mm fasten in wood.

If you drive in two such screws and load them with your own body weight, you'll know if you can trust the screws.