Strength classes for threaded rods?

[justusandersson]

It will probably hold anyway if you have enough fastenings. Then the lever arms won't be so long. But it would have looked nicer.

 

[Mogg]

It will surely hold if you have enough fastenings. Then the lever arms won't be as long. But it would have looked nicer.

They will be hidden, but I realize that 10mm will be too flimsy.

I'm home now and wrote from work earlier. It's not 11 fastenings for the support beam but 18. Could 14mm be enough?

 

[justusandersson]

Yes, 18 at 14 mm should be more than enough. By nicer, I meant from a constructive perspective, not purely visual.

 

[Mogg]

Yes, 18 pieces at 14 mm must be enough with good margin. By nicer I meant from a constructive point of view, not purely visually.

Yes, it looks "cleaner", more strict and more professionally done as you described it.. Why didn't I think of that from the start...!! But I'll try to find good quality threaded rods tomorrow! Jula only had 4.8 on theirs.

14 mm probably doesn't exist

 

[Mogg]

You must start from your needs and then see how many rods and of what dimension and quality are needed.

If there's anything I CAN'T do, it's calculating this stuff.. I'm a "happy" amateur in the field with two left hands when it comes to things like that. Unfortunately... But 18 attachment points for the load-bearing line with HGS 8.8 FZV M16 should be more than enough...? Those are the threaded rods I should go for.

Dad had a knack for various types of calculations, but not "little brother" (i.e., me). I would like to have some sort of strength calculation or formula, etc., to be able to have it on "paper."

By the way, I broke the load-bearing line when I was increasing the holes from 10mm to 16mm, so I'll have to buy a new one. On the other hand, I can adjust the number of attachment points to a fewer number too.

 

[justusandersson]

But 18 attachment points for the carrier beam with HGS 8,8 FZV M16 should suffice...?

I'm convinced of that.

 

[MH1001]

You can count on an M16 8.8 handling about 7-8 tons in shear force before it breaks.

What the threaded rod's attachment in the wall can handle in terms of load, I do not know off the top of my head. But you can probably assume that 18 M16 will hold.

 

[Mogg]

It was HGS 8.8 M16 FZV. Bought them today along with matching nuts and suitable square washers.

 

[rävlyan]

I have a terrace 15 m long that hangs on 10 pieces of 16 mm threaded rod 5 cm out from the house, a beam 45X145, going through the sill with nuts and washers everywhere and it doesn't move. The gap is because I don't want dirt that never dries against the panel, sill, foundation wall, that creates problems in the future with rotting parts if it's tight.

 

[erkka]

It was HGS 8.8 M16 FZV. Purchased them today with accompanying nuts and suitable square washers.

Will surely be fine. Just remember that if you cut a vfz threaded rod, the rust protection is removed at the cut and it will start to rust over time.

 

[Mogg]

Will surely be fine. Just remember if you cut a vfz threaded rod, the rust protection is gone at the cut and it will start to rust over time.

Can you protect the threaded rods in any way where you've cut them? Dipping the ends in tar?

 

[richardtenggren]

There is cold galvanizing in a can, but the smartest thing is probably to have the cut end in the hole, maybe?

 

[rävlyan]

Lead paint, lead-based paint, can be painted with regular linoljefärg oil paint thick protection lasts about 15 years.

 

[erkka]

Is it possible to protect the threaded rods in some way where they have been cut? Dip the ends in tar?

There are various products, for example:

https://www.biltema.se/bilvard/bilu...ukter/zinkkallgalvanisering---farg-2000023760

 

[tobbbias]

Hammarlack works well as rust protection too, I think!? Maybe you have some at home...