Which way does a lock nut go on

Q: Which way round does a lock nut go?

Just as youd do with a typical nut, place the lock nut against the threaded end of the bolt.

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Which side of a lock nut goes on first?
Which way round does a lock nut go?
Can you put a lock nut on backwards?

If you're talking about Nylock style nuts where the element is to prevent the nut from vibrating loose:

The metal thread goes on first.

If you're talking about a nut with a built in fluid seal, due to its design, a Seal Nut will need to go on with the rubber element on the inside. The rubber must be compressed to seal against the surface it abuts, it's not going to seal if assembled with the rubber element on the outside.

How the seal works

Which side of a lock nut goes on first?

There are conflicting viewpoints on which nut should be installed first. However, the most common use case involves the jam nut being tightened down first. The jam nut is followed by the second nut which is tightened or "jammed" against the first jam nut.

Which way round does a lock nut go?

Just as you'd do with a typical nut, place the lock nut against the threaded end of the bolt.

Can you put a lock nut on backwards?

Putting one on backwards will deform the threads along the entire length of the engaged bolt. If you need a low profile nut try a "punch" nut. It will have three indentations on the flats of the nut.