A lock bolt comprising: a bolt body extending axially along a length and having a proximal end area and a distal end area, said bolt body comprising a metal; said bolt body including a first bolt body locking feature located on the bolt body along its length; a locking cylinder comprising metal having an inner cylinder bore that has an open end; a cylinder locking feature associated with the locking cylinder along a length of the inner metal cylinder bore; said inner metal cylinder bore dimensioned to axially receive the bolt body with the first bolt body locking feature; said first bolt body locking feature and said cylinder locking feature arranged to be irreversibly coupled to each other when the bolt body is fully received in the inner cylinder bore; a transparent cap member having an axial opening that is separate from and axially spaced from the inner cylinder bore open end of the locking cylinder, said transparent cap member being connected to the locking cylinder in a locked relationship with the axial opening aligned with the inner cylinder bore open end; said transparent cap member comprising at least one visible transparent cap member locking feature located within the axial opening of the transparent cap member; an over-molded resin or plastic bolt body casing permanently attached to said bolt body and covering a portion of the proximal end area of the bolt body, said bolt body casing including a second bolt body locking feature located between the proximal end area of the bolt body and the first bolt body locking feature, said second bolt locking feature engaging said visible transparent cap member locking feature in an irreversible manner against separation from the locking cylinder independently of and in addition to the first bolt body locking feature when the first bolt body locking feature is irreversibly coupled to the cylinder locking feature; said bolt body casing arranged to close said axial opening of the transparent member when the first bolt locking feature is irreversibly coupled to the cylinder locking feature. a bolt body extending axially along a length and having a proximal end area and a distal end area, said bolt body comprising a metal; said bolt body including a first bolt body locking feature located on the bolt body along its length; a locking cylinder comprising metal having an inner cylinder bore that has an open end; a cylinder locking feature associated with the locking cylinder along a length of the inner metal cylinder bore; said inner metal cylinder bore dimensioned to axially receive the bolt body with the first bolt body locking feature; said first bolt body locking feature and said cylinder locking feature arranged to be irreversibly coupled to each other when the bolt body is fully received in the inner cylinder bore; a transparent cap member having an axial opening that is separate from and axially spaced from the inner cylinder bore open end of the locking cylinder, said transparent cap member being connected to the locking cylinder in a locked relationship with the axial opening aligned with the inner cylinder bore open end; said transparent cap member comprising at least one visible transparent cap member locking feature located within the axial opening of the transparent cap member; an over-molded resin or plastic bolt body casing permanently attached to said bolt body and covering a portion of the proximal end area of the bolt body, said bolt body casing including a second bolt body locking feature located between the proximal end area of the bolt body and the first bolt body locking feature, said second bolt locking feature engaging said visible transparent cap member locking feature in an irreversible manner against separation from the locking cylinder independently of and in addition to the first bolt body locking feature when the first bolt body locking feature is irreversibly coupled to the cylinder locking feature; said bolt body casing arranged to close said axial opening of the transparent member when the first bolt locking feature is irreversibly coupled to the cylinder locking feature.