Abstract: The invention relates to an osteosynthesis screw (1) comprising a shaft (3) with a thread (2) and a head (4) formed at one end and having a notch (5) for a tool. The shaft region (3) with the thread has a configuration with a uniform thickness, ie. trilobular.

Abstract: A hole-shaping and thread-forming screw (1) has a non-cutting hole-shaping end section (2) that ends in a point, a haft section (4) provided with a thread (3) and an engagement section (5). The non-cutting hole-shaping end section (2) tapers towards its end. The whole screw is made of a stainless material, in particular its end section (2). When the screw (1) is driven in, a hole is haped without cutting into the workpiece (7) and is then threaded by the screw (1) itself.

Abstract: In the large-area washer with an aperture for fastener means, there are engagement components on the surface in the fastening direction of the washer. The engagement components engage a cover strip that is to be fastened. The washer also has stiffeners in the form of beads. Unreinforced corner regions of the washer lie radially outside the stiffeners relative to the aperture and can be elastically resiliently bent about an imaginary line at an acute angle to two central axes of the washer. Engaging components may be formed in these corner regions.

Abstract: A large-surface plain washer (1) has an opening (5) for inserting a fastener. Engagement elements (1) that increase the engagement with a plate and/r web to be fastened are provided at the surface of the washer (1) that faces in the fastening direction. In addition, projecting spacers (17) shaped as tongues (26) that become effective when several washers (1) are stacked are provided at the lower side of the washer (1). The free end of these tongues (26) may be supported on the top side of the plain washer located directly underneath, so that the washers may be stacked without causing the engagement elements (13) of different washers (1) to engage each other. Individual washers (1) may thus be easily separated from a stack of washers (1), either by rotating or by moving the lowermost washer.

Abstract: In a large-area washer (1) there is an aperture for the insertion of a fastener and a bead (16) to stiffen the washer (1). To provide better engagement with a plate and/or web to be fastened, there are engagement components (13) on the underside of the washer (1) which are pressed out of the whole material of the washer (1) and project approximately perpendicularly downwards from it. The engagement components (13) are conical or truncated cones.

Abstract: A package for elongated parts (2) has a supporting element (1) made of a supporting strip (4) and of a tear-off covering strip (5). The supporting strip (4) has openings (6) in which the elongated parts (2) are laid, forming a row of parallel elongated parts. The package may be easily removed by tearing the covering strip (5) along perforated lines (13, 14).

Abstract: In an explosive powder-driven setting gun in which a piston guide is axially displaceable within a casing and a driving piston is axially displaceable within the piston guide, a stop pin is provided for varying the volume of the combustion gases within the piston guide at the rear end of the driving piston. The stop pin extends between a locking piece in the rear end of the casing, through the rear end of the piston guide into contact with the rear end of the driving piston. An adjustable stop surface for the stop pin can be provided integrally with the locking piece, or as a separate member movably mounted in the locking piece. By adjusting the stop surface the spacing between the rear end of the driving piston and the rear end of the piston guide is determined for establishing the initial size of the combustion chamber for the explosive gases which propel the driving piston.