| 摘要 |
PROBLEM TO BE SOLVED: To provide a loosening-preventing nut and bolt for wood, and a bolt/ nut having superior economical efficiency. SOLUTION: This loosening prevention nut 10 for the wood is so formed that a head part 11 and a cylinder part 12 are integrated together, an internal thread 14 is formed in the inner circumference surfaces of the head part 11 and the cylinder part 12, and an external thread 13 is formed in the outer circumferential part of the cylinder part 12. The angle of the thread of the external screw 13 lies within the range of 30 deg.-60 deg..
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