Screw & plug question

[EHH]

Hello!

I am going to mount some shelves on the wall (hard concrete). They weigh 15.5 kg each and have dimensions of 120x40x38 cm. You install them by screwing a bracket to the wall that you then hang the shelves on. So far, I have hung up the brackets with 4 screws per bracket. I drilled 5mm holes and used 5x25mm plugs. I have used 4x40 mm screws (both plug and screw from this Screw/plug set 260 pieces | HARD HEAD (jula.se)).

Do you think that's enough? I am really a novice in this area. Do I need to make bigger holes, or more? The shelf weighs 15.5kg and I still want it to hold for books, decorative items, etc.

Thanks in advance!

 

[allexx]

Hello!

I am going to put up some shelves on the wall (hard concrete). They weigh 15.5 kg each and have the dimensions 120x40x38 cm. You put them up by screwing a bracket to the wall that you then hang the shelves on. So far, I have hung up the brackets with 4 screws per bracket. I have drilled 5mm holes and used 5x25mm plugs. I have used 4x40 mm screws (both plug and screw from this Screw/plug set 260 pieces | HARD HEAD (jula.se)).

Do you think it's enough? I am really a novice in this area. Do I need to make bigger holes, or more? The shelf weighs 15.5 kg and I still want it to hold for books, decorative items, etc.

Thanks in advance!

Feels very weak with 25mm. I would use nylon plugs that are around 8x60mm when the strain is on the holder.