Abstract: A pipe joint for use with a pipe thread provided on a fluid apparatus has a thread designed to mesh with any of pipe threads of different types of the same nominal diameter. Design of the pipe joint is simple because the thread provides mechanical connection, whereas a separate sealing member provides a non-leaking union. The screw-in portion of the pipe joint has an external or an internal thread that meshes with the innermost or the outermost of commonly used mating pipe threads of different types having the same nominal diameter. The axial length of the thread is reduced to a minimum within the limit that the desired firm mechanical connection is secure.