| 摘要 |
A threaded joint has an interference between thread roots of pin and thread crests of the box of value comprised between 1% and 5% of the average thickness of the connection, and a root to load flank radius R comprised in the range of 0.2 mm and 0.4 mm and a surface treatment comprising shot peening applied to the beginning and end of the threaded zone of the pin. In other embodiments the interference can be between thread roots of box and thread crests of the pin.
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