| 摘要 |
A self-fixing bolt 1 has a male-threaded body 2 and an annular barrel portion 3 having an upper region that continues from the lower end of the body. The barrel portion 3 has an outer periphery larger in diameter than the body 2, the barrel portion having a cylindrical opening 4 with a lower end to punch a hole in the metal panel 10 when driven to be attached to this panel. The bolt has a thrust-bearing shoulder 5 formed integral with the upper region of the barrel portion. Anti-rotation retentive lugs 9 protrude in a longitudinal direction from the outer periphery 8 of the barrel portion to be pointed outwards in a radial direction, each lug 9 being of a triangular or trapezoid cross section, so that the bolt is not accompanied by any oversized flange, thus rendered smaller in size and lighter in weight, and nevertheless surely protected from any undesired idle rotation relative to the panel when the its portion and the bolt form an assembly.
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