Translation guide
The act of closing or securing something, or the device used to do so. In Japanese, the translation depends heavily on what is being fastened and how.
To close or secure an item like a bag, belt, or piece of clothing using a built-in fastener.
General term for a fastener or clasp. Often used for the physical object.
The fastening on this bag is broken.
Verb meaning to tighten or fasten, used for belts, neckties, and similar items.
Please fasten your seatbelt.
Verb meaning to fasten or secure, often with a pin, button, or clip.
I fastened the scarf with a brooch.
To close an opening on clothing or a bag using a zipper, buttons, or snaps.
To secure something by tying a knot or binding.
To make something secure so it cannot be opened easily, often with a lock or latch.
To join or affix something securely to something else.
The English word 'fastening' covers many actions and objects. In Japanese, you must choose the specific verb or noun that matches the method (tying, locking, clipping, etc.). Using a generic word like ファスニング is not natural.
I fastened the door latch.
Fasten the snap button.
I fastened the luggage with rope.