The jam nut essentially acts as the “other object”, as the two nuts are tightened against each other. … Then the other nut is screwed down on top of the first nut. The inner nut is then slackened back and tightened against the outer nut. Jam nuts can also be used in situations where a threaded rod must be rotated.

What is the difference between a hex nut and a jam nut?

The main differences between a jam nut and a regular hex nut is that they are tightened against each other instead of against a material, and that they are about half of the size of a regular nut.

Do I need a jam nut?

Small (jam nuts) are frequently used since there is no need to have a full height nut on the bottom since the threads do not carry the load.