| 摘要 |
In process of threadably fitting a metal shell (50) having a surface formed with an Ni plated layer into a mounting hole (91), in a state where a gasket (60) made of stainless steel is uncompressed while being interposed between a protrusion part (54) and an opening periphery (92), a surface of the gasket (60) is out of contact with another surface thereof. When the gasket (60) is viewed on a cross section in a direction of an axial line O, the gasket (60) contacts with the protrusion part (54) at one point of a point X, the gasket (60) contacts with the opening periphery (92) at one point of a point Y, and the point Y is located outside of the point X in a radial direction. Further, the point Y is located inside of a maximum outer diameter Dz of a seating surface (55) of the protrusion part (54) in the radial direction. |
