| 摘要 |
PROBLEM TO BE SOLVED: To provide a coating part without spending time and cost.SOLUTION: A screw element for connecting a plurality of pipes 2, preferably a plurality of pipes for a vehicle with an engine, includes a thread portion 3, and at least one contact face 4, 5 having no thread. The screw element includes an outer coating portion and an inner coating portion. The outer coating portion includes polymer and nanoparticles of a first solid matter. |
