| 摘要 |
PROBLEM TO BE SOLVED: To set a stable small value for a concentricity between a small diameter cylindrical part 1a and a through hole 1b and between a large diameter cylindrical part 2a and the through hole 1b. SOLUTION: In the diameter conversion ferrule 10, which has a through hole 1b in the longitudinal direction and which has a large and small diameter cylindrical parts 2a, 1a at one end and the other end respectively, there is arranged a small diameter ferrule 1 over the entire length in the longitudinal direction, with a cylindrical body 2 fixed on one end of the small diameter ferrule 1 to form a large diameter cylindrical part 2a.
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