BOLT

To provide a bolt having an improved performance.SOLUTION: A bolt 10 is constituted in such a way that the same comprises a head part 12; a shank part 14 extending from one end 14a to the other end 14b, a screw 110 of a right screw or a left screw keeps a first distance between adjoining valleys, one screw having a first lead angle to extend along an extending direction of the shank part 14, the other screw of the right screw and the left screw extend in two lines along an extending direction, the first line screw 120 of said the other two lines keeps a second distance of about two times of said first distance between the adjoining valleys and has a second lead angle of about twice of said first lead angle, the second line screw 130 of the other screw of said two lines keeps said second distance between the adjoining valleys to each other, has said second lead angle, and the shank part 14 where the first line screw 120 and the second line screw 130 extend oppositely to each other with said first distance between a valley of the first one line screw 120 and a valley of the second line screw 130 adjacent to the former valley oppositely extend to each other with said first distance being kept.SELECTED DRAWING: Figure 4 【課題】 向上した性能を有するボルトを提供すること。【解決手段】 ボルト１０は、頭部１２と、一端１４ａから他端１４ｂまで延びる軸部１４であって、右ネジ及び左ネジのうちの一方のネジ１１０が、隣接する谷同士の間に第１距離を維持しかつ第１リード角を有して軸部１４の延設方向に沿って１条延び、右ネジ及び左ネジのうちの他方のネジが延設方向に沿って２条延び、前記２条の他方のネジのうちの第１条のネジ１２０が、隣接する谷同士の間に前記第１距離の約２倍の第２距離を維持しかつ前記第１リード角の約２倍の第２リード角を有し、前記２条の他方のネジのうちの第２条のネジ１３０が、隣接する谷同士の間に前記第２距離を維持しかつ前記第２リード角を有し、第１条のネジ１２０と第２条のネジ１３０とが、第１条のネジ１２０の谷とこれに隣接する第２条のネジ１３０の谷との間に前記第１距離をおいて相互に対向して延びる、軸部１４と、を具備する。【選択図】 図４