How is the length of a screw/bolt decided?
Good afternoon. Let us say that two pieces of metal are bolted together. Two parts to the question:
- I would imagine the only part of the bolt that is under tension would be between the head of the bolt and the nut. Is this correct? Thus, the part of the threads beyond the nut are just…present, not actually doing anything and have no forces on them.
- How is the length decided? As long as the bolt can sufficiently pass through all materials and have at least one thread (arbitrary?) beyond the end of the nut, wouldn’t that have the same outcome as 30+ extra threads?
Thank you for your input!