| 摘要 |
PROBLEM TO BE SOLVED: To provide a fitting part socket of a nut runner device capable of preventing from being worn, and capable of elongating the life in the fitting part socket of the nut runner device for fastening or loosening a bolt nut by fitting and rotating. SOLUTION: A material of the fitting part socket 15 attached on the nut runner device 11 is chrome molybdenum steel, and a process for thermal processing is made by carbonitriding quenching and nitriding annealing (high temperature tempering) after carburizing. COPYRIGHT: (C)2006,JPO&NCIPI
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