Abstract: A metal guide member (1) for guiding a fastening member (12) into a hard receiving material, as it is driven by an explosive powder charge driven setting tool, has a through opening (2) with a guide arrangement formed of at least three spaced-apart, plastically deformable guidance surfaces with such surfaces having a convex shape extending in the axial direction of the through opening. The guide arrangement assures guidance of the fastening member as it is driven and, at the same time, avoids any interference with the deformation of the guidance surfaces.

Abstract: Attachment member unit includes an axially extending shank (1) with a load engagement part (2) at its trailing end. The shank has a pointed tip (3) at its leading end. A prestressing element (4) laterally encloses the pointed tip (3). The prestressing element is formed of a sleeve part (4a) and a bearing part (4b). The bearing part forms the leading end of the prestressing element and the sleeve part forms its trailing end. A recess (4c) extends into the bearing part from the leading end. The recess (4c) has a diameter such that the trailing end portion of the prestressing element under deforming forces can telescope into the bearing part. When the attachment member unit is driven, the prestressing element (4) causes a prestress against a connector member (7) and due to the telescoping action and also a dampening action, the connector member can be fastened to a receiving material (8) by the shank (1), and the connecting member is not damaged.

Abstract: Nails are driven into hard receiving materials such as concrete, rock, metal and the like by explosive powder charge operated setting tools. To achieve the high mechanical strength required for such nails, the nails are formed of two parts, one a shank and the other a head fitted onto the shank. While the head is formed of a deformable corrosion resistant steel, the shank is formed of an austenitic steel alloyed with nitrogen having a very high mechanical strength. The steel forming the shank can only be shaped to a very limited extent, whereby a narrow flange is provided on the rear end of the shank. A disk fitted on the shank serves as a guide for the nails during the driving operation.