| 摘要 |
PROBLEM TO BE SOLVED: To easily confirm abrasion of a pipe connecting part having a tapered screw. SOLUTION: A pipe connecting part with a screw has a box member 12, a pin member 10 and an abrasion indicator 18 for the connecting part. The pin member has a male screw, and the box member has a female screw. The female screw of the box member becomes wider in width in one direction, while the male screw of the pin member becomes wider in width in the other direction so as to fit the complementary type female and male screws to each other in assembly of the connecting part. |
