screw pitch gauge BrE termin techniczny
screw pitch gage AmE termin techniczny

You can determine the number of threads by using a screw pitch gauge.

The screw pitch gauge has a number of metal templates that are notched to match the thread configuration of bolts.

If it is threaded, count the number of threads per inch (you can use a screw pitch gauge, available at auto supply stores, for this)-- thread standards can vary between manufacturers.