| 摘要 |
<p>The invention provides a pipe joint made of resin in which a predetermined pressing force in the axial direction corresponding to a fastening torque of a union nut can be obtained, and the strength of threads can be enhanced. Each of threads of an external thread portion 9 of a joint body 1 and an internal thread portion 20 of a union nut 3 is formed as an asymmetrical trapezoid, an included angle alpha 1 of flanks 9a and 20a of the asymmetrical trapezoidal threads which are made in contact with each other by fastening the union nut 3 is set to 70 to 90 DEG , and an included angle alpha 2 of flanks 9b and 20b opposite to the flanks is set to 40 to 80 DEG (which is an angle smaller than the included angle alpha 1). <IMAGE></p> |
