| 摘要 |
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 alpha1 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°, and an included angle alpha2 of flanks 9b and 20b opposite to the flanks is set to 40 to 80° (which is an angle smaller than the included angle alpha1).
|
