Quick Tips for Installing Your Wall Fixtures
Different types of wall fixtures have different connecting arrangements, but you can usually attach the strap right to the fixture outlet box with screws. Then you can attach the wall fixture to the strap with a nipple and knurled cap.
If the box has a central stud, you will need only an adapter and a nipple to attach the fixture. An adapter is screwed onto the stud, the nipple is attached to the adapter and the fixture is attached to the nipple.
Wall fixtures are usually quite simple to install. Manufacturers of wall fixtures design different mounting arrangements. The manufacturer will usually include complete installation instructions with the fixture.
Read and follow the manufacturer's instructions carefully. Always turn off the current before installing any fixture.