Pipe joint assembly with synthetic resin-made fastening limiting device for a joint fastening member

The present invention relates to a fastening-limiting device (1) for a fastening member (120) which fastens a pipe (200) inserted into a pipe receiving port (110) on the side of a joint (A). The fastening-limiting device (1) has a ring portion (21) which is fittable onto the outside of the pipe receiving port (110). A beam portion (28) is formed on the ring portion (21). A protrusion (26) is formed on the beam portion (28). A first abutting portion (22) which is to abut against a reference face (130) on the side of the joint (A) is formed on one end of the ring portion (21). A second abutting portion (23) which is to abut against a confronting portion (121) of the fastening member (120) is formed on the other end of the ring portion (21). The gap (a) between the first and second abutting portions (22) and (23) is equal to the gap between the reference face (130) and the confronting portion (121) at the timing when the fastening member (120) exerts a sealing property and a function of preventing slipping-off. According to the invention, when an appropriate sealing property of the pipe connection portion and prevention of slipping-off of the pipe are to be attained, the screw amount of the fastening member can be appropriately determined without dispersion.