Abstract: A pin for a pin and swaged tubular member type of fastener has a shank (14) provided along nearly all of its length with identical combination locking, breakneck and pulling grooves (20). Each groove is provided on at least one sidewall with a discontinuity, and in a preferred embodiment both sidewalls of each groove are provided with discontinuity in the form of a displacement across the width of the groove and along the length of the pin. Alternatively the discontinuity may take the form of a change in inclination of the groove wall, or a combination of both such displacement and change in inclination.

Abstract: A resilient seal 15 for the head 14 of a headed pin fastener member comprises an annular sealing bead 25, an annular boss 24 projecting on both sides beyond the thickness of the bead 25 and having tapered faces 29, 29, and a thin annular web 26 joining the parts 24 and 25. The symmetry of the seal enables it to be assembled on the pin either way round, with the same result.

Abstract: A barb for engagement with a body 13 of deformable material such as nylon has a sharp edge 28 at the top of a relatively steep face 29 forming one side of a trough 32. A ledge or rim 38 projects from the face 29, about halfway up the face 29, and provides an abutment which restricts the extent to which the deformable material can enter the trough. This improves the resistance of the barb against being pulled out of the trough. This form of barb is particularly applicable to fasteners of the type in which a threadless bolt having barbs is embedded in a shell carrying a nylon sleeve.The barb is manufactured by a rolling process in which two dies are successively applied to a cylindrical blank, the first die to form the trough 32, and the second die to form the ledge 38.

Abstract: A two-part fastener intended for securing, e.g., a panel 41 to a frame member 42 comprises a tubular shell 11 and a pin 12. The shell bore contains a tubular insert or slug 14 of resilient nylon material. The exterior of the pin is formed with annular barbs 30. When the pin is inserted into the shell, the barbs 30 engage in the resilient slug 14 to secure the pin and shell together. The pin includes a removable pintail 33 which protrudes beyond the shell and assists in the pulling of the pin into the shell by means of a suitable pulling tool.