| 摘要 |
The fixing nut has a collar (12) extending around it in a plane perpendicular to the central longitudinal axis (24) of the internal thread (14). The front faces (70,71) of the front ridge (72) form an angle (69) which is greater than 90 degrees. The distance (37,38) between point (39) of first thread (40) of bolt (4) or intersection point (41) and a point of intersection (44) and the external diameter (46) is larger than the opening (47,48) between point (50) and a point of intersection (51) and the internal face of envelope (53) of the hub bore (49). The larger opening (48) is at least equal to the diameter of the hub (57) of bolt (4).
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