| 摘要 |
PROBLEM TO BE SOLVED: To prevent looseness regardless of the penetration of a solvent or the like for reducing the friction coefficient of lubricant or the like on the contact surface of a clamped screw. SOLUTION: A hard particle 2 whose particle diameter is 10μm or less is adhered to a pressure reception screw surface 1a of a bolt 1, thus generating wedge effect to the pressure reception screw surface of internal threads by the hard particle 2 after clamping the bolt 1 for stopping looseness. COPYRIGHT: (C)2004,JPO
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