| 摘要 |
PROBLEM TO BE SOLVED: To provide a colored head bolt causing no change in a color applied to a bolt head even if used in high temperature environment. SOLUTION: In the manufacturing method of the colored head bolt made of titanium, used near high temperature parts such as an engine part, a thread part of the bolt is completely embedded in a tool to expose only the bolt head on a working surface of the tool, and the bolt head is baked and colored at 200°C or higher. COPYRIGHT: (C)2005,JPO&NCIPI
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