Schedule 80 Steel Pipe Nipple, 1-11-1/2 Male NPT, 1.50 Inch Long

At 1.50 inches long with 1-11-1/2 NPT threads, it falls into the close nipple range, meaning most of the length is threaded with very little or no unthreaded center. The 1-11-1/2 designation means 1-inch nominal pipe size with 11.5 threads per inch, so yes, it will thread directly into any standard 1-inch female NPT fitting. Schedule 80 wall thickness is heavier than Schedule 40, which gives you more material to work with in high-pressure lines or anywhere you need a little extra durability in the connection.