| 摘要 |
A superfine finish piping joint has a metal C ring disposed between a couple of joint pieces, the piping joints being capable of properly tightening the metal C ring for thereby being usuable for piping to a clean room. The superfine finish piping joint includes, besides a couple of the first and second joint pieces, a box nut, a thrust bearing disposed between a base portion of second joint piece facing to the internal end surface of an box nut, and a cup-shaped retainer serving to mount balls and rings, etc., of the thrust bearing as a whole on the second joint piece, etc., at prescribed positions.
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