If you can hang your heavy object in line with a stud and screw a long screw directly into the stud that s always the best option.
How to hang heavy objects on plaster wall.
Though there are several methods of locating studs or supports behind the wall the most reliable is using a magnetic stud finder.
Simply hanging something heavy on a plaster wall can result in damage to the wall and the object if you don t tap into the supporting structure behind the plaster.
For lighter items simply screwing into the plaster with a 1 1 4 drywall screw is usually enough to get the job done.
Use a screwdriver to screw it in until it s flush with the wall.
No power tools are required for this self drilling fastener.
Even more so if you live in an old house with plaster and lath walls.
Place a piece of painter s tape on the wall roughly where you want the object to be.
Studs can help support the weight of heavy objects.
Mark it on the painter s tape using a pencil.
Mark the spot where you want to hang the object.
If your walls are made of plaster or drywall one option is to affix the object to a spot on the wall directly into a stud.
The proper way to hang objects 10 to 25 pounds instead use a threaded drywall anchor to securely hold objects between 10 and 25 pounds such as heavy picture frames bulletin boards mirrors and light weight shelving.
Screws and screws with masonry anchors for heavy items are your best choice for hanging things on plaster walls without picture rail.