It is the most common type of push button switch on the board mount.
The pin pitch is not exactly on universal 2.54mm
If you bend the pin slightly, it can be implemented something, but if you do too much force, the pin will break.
Specifications:
·Type: 0.2 inch (6 mm) square, Housing Shape: Square, Plunger Type: Vertical Type; Operation Part Shape: Round; Operation Part Color: Black; Operation Part Dimensions: Φ0.1 - 0.1 inch (3 - 3.5 mm); LED: None; Mount: Snap-in; Note: