| 摘要 |
A threaded plastic plug (1) comprises a single-piece structure, having a longitudinal axis (2) of symmetry, and comprises a head (5), a body (3) with an outer thread (6) and a cylindrical collar (17b), and a tightening flange (4) interposed between the head (5) and the body (3). The head (5) has the shape of a tubular solid (8) projecting from the flange (4) in a direction parallel with the axis (2) of the plug (1), and comprises an inner cavity (7), accessible from the outside through one end of the solid (8), the cavity (7) being laterally surrounded by a non-circular surface (22) of an annular wall (9). The wall (9) of the tubular solid (8) which surrounds the cavity (7) having a variable thickness, the greater thickness being located close to the flange (4) and entirely facing towards the inside of the cavity (7). [FIG. 1]
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