One, can particleboard be used with expansion screws?
Not recommended for use.
The expansion screws are fixed by utilizing the wedge-shaped angle to induce friction and locking force from the expansion, achieving a secure fastening. However, their fixing strength is not entirely reliable and may lead to detachment.
If the wall behind the large-span panel is securely fixed, using longer expansion bolts will provide a better result.
Two. What type of screws are suitable for plywood?
Plywood can be fastened to square steel using self-tapping screws, which are screws with a built-in drill bit. These are readily available at building material markets.
Using a power drill, you can drive self-tapping screws through wood panels into the inside of a steel plate. However, pay attention to the length of the screws; if they are too short, the patch will not hold well, and if they are too long, they will penetrate too deeply into the steel plate.
Self-tapping screws typically feature a self-drilling head that allows them to be driven into the substrate without the need for a nut. Screw heads come in various types, including round head, pan head, and countersunk head, while the shank typically features a pointed end for self-drilling.