Multi-threaded threaded joint, steel pipe with joint with the multiple threaded joint

摘要

PROBLEM TO BE SOLVED: To provide a multi-row screw joint of a steel pipe easy in construction management, and a steel pipe with a joint having the multi-row screw joint.SOLUTION: A multi-row screw joint 3 on the present invention is a multi-row screw joint 3 installed in an end part of a steel pipe and connecting the steel pipe, and a common fitting mark 17 used for positioning both of a fitting completion position and an insertion time position with one of a male screw joint part 5 and a female screw joint part 7 threadedly engaging therewith, is attached to the other and a fitting confirming fitting mark 19 coinciding with the common fitting mark 17 in a position in fitting completion time and an insertion position confirming fitting mark 21 used for insertion-positioning, are attached to the one joint part fitted to an object of attaching the common fitting mark 17.SELECTED DRAWING: Figure 1