Magnetic drain bolt

A process of making a magnetic drain bolt comprising the steps of:

• forming a bolt body with a male-threaded member and a head member, the male threaded member being formed with an axial bore at a bottom end thereof,
• forming a sintered slug of a magnetizable material with a base and a projection extremity, the base being formed having a depth slightly smaller than a depth of the axial bore and having a slightly smaller transverse dimension than an inner transverse dimension of axial bore, the projection extremity being formed having at least circumferential portions creating a transverse dimension slightly smaller than a transverse dimension of the base and extending axially from the base thereby defining a shoulder along a bottom edge of the base;
• telescopically inserting the base of the sintered slug within the axial bore of the bolt body;
• crimping a bottom edge of the male threaded member at a bottom edge of the axial bore over the shoulder and against the projecting extremity to create a lip whereby an inner transverse dimension of the lip is decreased to a dimension slightly less than a maximum transverse dimension of the base and slightly larger than a minimum transverse dimension of the projection extremity, wherein the crimping is done in a manner that does not exert an excessive force on the sintered slug that could damage the slug;
• and
• magnetizing the sintered slug.