PROBLEM TO BE SOLVED: To facilitate screwing a male thread part into a female thread socket by fitting a male block whose one side is formed with a gripping part by a thread cutting device, other side is formed with a tapered male thread part and top end is formed with a non-threaded part. ;SOLUTION: For use, a female thread socket 1 whose inside is hollow over its overall length is formed with tapered female thread parts 1a, 1b of smaller diameter as it comes inward from both sides, therefore, screwing is much easier by forming a pipe material 3 which is formed into a short nipple and a male thread block 2 into a slightly tapered thread. A non-threaded part 2c is formed at the top end of the male thread block 2 so that the non-threaded part 2c can enter from the female thread part 1a of the female thread socket 1 through an opposite side female thread part 1b, therefore, it is possible to facilitate bringing it into close contact with the male thread top end of the pipe material 3 which is formed into a short nipple only by holding both sides with a hand and tightening them.;COPYRIGHT: (C)1997,JPO
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