| 摘要 |
A bolt to be screwed-in into a lubricant-containing housing, including a magnet (4), a head portion (2) having rotation-transmitting surfaces, and a shank portion (3) extending from the head portion (2) and having an outer thread (31) and a recess (32) provided at a free end of the shank portion (3) for form-lockingly receiving the magnet (4) and having a depth (T) measured from the free end of the shank portion (3) and substantially corresponding to an axial width of the magnet (4).
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