You can count the number of tours per unit length using your ruler.
- Choose too points of the bolt thread and use your thumb nails to make sure you don't move during the process.
- Use the ruler to measure the distance between the two points you chose.
- Move one thumb towards the other one, while counting the tours, until you reach the other one.
- Divide the number of tours you counted by the length you measured.
You can also easily characterize the diameter of the bolt using your ruler.
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