Abstract: A vibration resistant fastening system including a high fatigue strength bolt made from a first material and a nut made from a second material that is softer than the first material of the bolt. The bolt includes bolt threads and the nut includes pre-tapped nut threads that match with the bolt threads. The fastening system utilizes a combination of unique geometry of the nut and bolt threads and a hardness differential between the nut and bolt to provide vibration resistance. When tightened, crests of the bolt threads embed into the soft bearing flanks of the nut threads. Simultaneously with the bolt crest embedment, the softer nut thread crests flow radially inward into the root radius of the bolt threads. This complete contact between the nut and the bolt restricts the nut from moving in a transverse direction relative to a longitudinal axis of the bolt.

Abstract: A connector bolt for securing an oil cooler to an engine block is made of first and second telescopic pieces. The bolt can be made in different lengths by adjusting the telescopic position of the first and second pieces. The length is fixed by securing the relative positions of the first and second pieces.

Abstract: A micromechanical seal between a first body and a second body is co-axially threadably securable about a portion of the first body. The seal is created by the combination of an annular planar radial surface within the first body; a surface of rotation of the first body disposed radially inwardly of the annular plane surface and defining, within a radial plane of the body, an obtuse angle, relative to the planar radial surface, in a range of about 90.