Abstract: A stainless-steel fitting for resin tubes, which easily and securely connects resin tubes and is also inexpensive, is provided. Resin tube (9) is inserted into insert part (8), provided on fitting main body (1); nut (3) is screwed onto fitting main body (1) and sleeve (2) is moved; in the pipe fitting which presses and locks resin tube (9) between insert part (8) and sleeve (2), a step part, composed of large diameter part (2a) and small diameter part (2b), is formed on the outer surface of the sleeve part (2); the length of small diameter part (2b) is that wherein the end-face of the small diameter part (2b) protrudes outward from nut (3), when sleeve (2) is inserted into nut (3); and nut (3) and sleeve (2) are integrated by pressing and spreading the inner diameter of this end-face.

Abstract: A joint includes a joint main body, a sleeve and a nut. The joint main body has a joining hole and an external threaded part. The nut is threaded onto the external threaded part in a threaded state in which the pipe and the sleeve are inserted through the joining hole. The nut joins the pipe to the joining hole via the sleeve. The sleeve is tightly fitted to the pipe and the joining hole by the threading of the nut to induce deformation that expands radially outward. The deformation prevents insertion of the sleeve into the joining hole to a specific position in an unthreaded state in which the pipe and the sleeve have been pulled out from the joining hole.

Abstract: A joint includes a joint main body, a sleeve and a nut. The joint main body has a joining hole and an external threaded part. The nut is threaded onto the external threaded part in a threaded state in which the pipe and the sleeve are inserted through the joining hole. The nut joins the pipe to the joining hole via the sleeve. The sleeve is tightly fitted to the pipe and the joining hole by the threading of the nut to induce deformation that expands radially outward. The deformation prevents insertion of the sleeve into the joining hole to a specific position in an unthreaded state in which the pipe and the sleeve have been pulled out from the joining hole.

Abstract: A stainless-steel fitting for resin tubes, which easily and securely connects resin tubes and is also inexpensive, is provided. Resin tube 9 is inserted into insert part 8, provided on fitting main body 1; nut 3 is screwed onto fitting main body 1 and sleeve 2 is moved; in the pipe fitting which presses and locks resin tube 9 between insert part 8 and sleeve 2, a step part, composed of large diameter part 2a and small diameter part 2b, is formed on the outer surface of the sleeve part 2; the length of small diameter part 2b is that wherein the end-face of the small diameter part 2b protrudes outward from nut 3, when sleeve 2 is inserted into nut 3; and nut 3 and sleeve 2 are integrated by pressing and spreading the inner diameter of this end-face.

Abstract: A joint includes a joint main body, a sleeve and a nut. The joint main body has a joining hole and an external threaded part. The nut is threaded onto the external threaded part in a threaded state in which the pipe and the sleeve are inserted through the joining hole. The nut joins the pipe to the joining hole via the sleeve. The sleeve is tightly fitted to the pipe and the joint main body by the threading of the nut and is cut off through a linking part that links a sleeve main body and a separating part. The sleeve can no longer join the pipe to the joining hole after the nut is removed and the pipe and the sleeve are pulled out from the joining hole.