How to securely attach posts to a stud?

[jisse]

I am about to install a railing for a loft. The posts I intend to use are stainless steel pipes and they will be attached to the side of the beam supporting the loft floor, see attached image. The beam is a standard 45*170.

Ideally, I would like to use through bolts, but that requires me to remove the floor on the loft...

My experience with coach screws is that they easily strip the threads and the fastening isn’t very secure. Is there another solution? For example, a strong expansion bolt (not intended for drywall) or good thick screws that hold well.

I’m thinking of using 2-3 screws in total for the 170 mm of the beam. The posts are a total of 110 cm high above the floor.

Grateful for help

 

[MathiasS]

French screws are both ugly and worthless. When I screwed posts on the patio this week, I used:

http://www.vsbyggskruv.se/produkter/pdf/sid 76.pdf

Faster to screw, pulls much better, no pre-drilling, etc., etc. Perfect.

Surely there's a shiny variant to use indoors as well.

 

[Styx]

You might be able to smear some PL400 there before you screw it in, once it has cured you can probably remove the screw

 

[jisse]

Thanks for the answers, those are the screws I have been looking for! Up to 12 mm, have never actually seen them...

 

[styrman1]

I have the same screw in my railing as MathiasS linked to.
Recommending someone to glue a railing with only PL400 is not only stupid, it's also dangerous.

 

[Styx]

I have the same screw in my railing that MathiasS linked to.
recommending someone to glue a railing with only PL400 is not only stupid, it is also dangerous.

What is most stupid is not realizing it was meant as a joke, the part of the post where the screw was to be removed, that is..