These snap locks can be used to latch a door, but not to clamp it.
This is why it is important to position the locking distance A (door + frame width) with great accuracy and precision.
For snap locks GN 315, the locking distance can be set continuously via the setting sleeve adjustable via a precision thread. This makes installation a great deal easier.
For installation, set a bore diameter in the door as shown in the outline drawing.
The snap lock is pushed through the bore diameter from the front and mounted from the back with a hexagon nut.
The installation bore diameter in the door leaf is usually generated by punching or laser machining in series production.
For small series and steel sheets below 2 mm thickness, the sheet metal punshes GN 123
are the tool of choice.
The installation bore diameter can also be set by drilling / milling as shown in the outline drawings.