Abstract: A lockbolt including a bolt shaft having a locking portion. The locking portion includes a plurality of grooves around a surface of the bolt shaft and a plurality of peaks at least some having a parallelogram shape and being disposed between the plurality of grooves. The lockbolt also includes a bolt head on a first end of the bolt shaft.

Abstract: A method of securing at least two workpieces, which includes inserting a bolt shaft through a bore hole formed in each of the workpieces, and applying a sealant to the workpieces. Further, the method includes engaging a locking collar with the bolt shaft such that the locking collar is securely deformed in a locking manner thereby forcing the sealant to uniformly distribute and form a thin surface sealant layer on the bolt shaft.

Abstract: A lockbolt includes a bolt head, a shank, a locking portion, a predetermined breaking point, and a break-away portion. The locking portion includes a knurled surface having knurling peaks between intersecting knurling grooves that extend in a direction with an axial component, e.g. spiraling helically. A sealant on two workpieces smears onto the knurled surface when the bolt is inserted in a hole therein, but does not need to be removed. A locking collar is swaged onto the locking portion to secure the workpieces between the head and the collar. The sealant is distributed as a thin layer to provide a seal and an adhesive bond between the collar and the knurled surface. Excess sealant is squeezed-out axially, without forming encapsulated pressurized sealant pockets and without hindering the swaged engagement of the locking collar onto the knurling. Then the break-away portion is broken-off at the breaking point.

Abstract: A lockbolt includes a bolt head, a shank, a locking portion, a predetermined breaking point, and a break-away portion. The locking portion includes a knurled surface having knurling peaks between intersecting knurling grooves that extend in a direction with an axial component, e.g. spiraling helically. A sealant on two workpieces smears onto the knurled surface when the bolt is inserted in a hole therein, but does not need to be removed. A locking collar is swaged onto the locking portion to secure the workpieces between the head and the collar. The sealant is distributed as a thin layer to provide a seal and an adhesive bond between the collar and the knurled surface. Excess sealant is squeezed-out axially, without forming encapsulated pressurized sealant pockets and without hindering the swaged engagement of the locking collar onto the knurling. Then the break-away portion is broken-off at the breaking point.

Abstract: The invention concerns a bush (13) to be formed around a lockbolt rivet (4) by means of a tool (14) which applies a longitudinal force, thus producing a high-strength riveted joint. The bush has substantially the shape of a hollow cylinder, but its shape deviates from rotational symmetry in such a way that when it is being formed around the lockbolt rivet (4), a torsional force acting in the direction of arrow (20) is superimposed on the longitudinal force acting in the direction of arrow (19).

Abstract: A tolerance river for highly stressed riveted joints possessing a shank (3) whose length is harmonized with the two components to be joined, followed by a retaining piece (5) interacting with a retaining collar and provided with grooves (9) on its circumference. An enveloping jacket (12) which links the root diameters d1, d2 of the grooves, widenes conically from the head of the tolerance rivet toward its opposite free end. The grooves (9) on the retaining piece (5) have decreasing groove width a1, a2, etc., and increasing asymmetry of the groove profile. The first groove (9) located at the retaining piece (5) of the tolerance rivet that is located after the shank (3) in the direction toward its free end, possesses rounded shaping r3 in the area of its root diameter d1 whose area (13) is strain-hardened.