Patent ID: 6078238
Filing Date: 2000-06-20
Classification: B03C,F01M

Abstract:
A bolt to be screwed-in into a lubricant-containing housing, comprising 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 corresponding to an axial width of the magnet (4)wherein a ratio between the depth (T) of the recess (32) of the shank portion (3) and an outer diameter (D) of the shank portion (3) is in a range from 0.1:1 to 0.2:1.