Abstract: A fastener comprising a fastener body and a fastener head is disclosed. The fastener body has a threaded portion and defines a longitudinal axis. The fastener head is arranged at one end of the fastener body, and comprises a tool engaging portion. The tool engaging portion comprises a plurality of alternating lobes and flutes forming a multilobular surface pattern, each lobe having a driven surface arranged to engage with a driving surface of a tool, and a trailing surface arranged opposite to the driven surface. The driven surface and the trailing surface extend substantially parallel to the longitudinal axis defined by the fastener body. The trailing surface of at least one lobe is provided with a modified zone in which a diameter of the lobe is increased, said modified zone providing a wedging effect between the tool engaging portion and a tool. In the fastener of the invention wobble between the fastener and a tool is significantly reduced.

Abstract: A fastener is described having a head formed with a recess which accommodates a square head driver, symmetrical drivers, such as PHILLIPS™ style drivers, asymmetrical style cross head drivers, such as POZIDRIV® style drivers, and combination square and cross drivers without compromising performance of the drivers.

Abstract: An apparatus for forming slots in headless screws includes a rotatable disc holding, along its circumferential end, a plurality of clamps which extend radially and are spaced apart circumferentially and which respectively have radial screw receiving spaces opening at the circumferential end, a feeding member provided above the rotatable disc to drop screws into the screw receiving spaces successively, a rotary cutter unit provided downstream of the feeding member for successively cutting the ends of the screws exposed from the screw receiving spaces, and a press member provided adjacent to the rotary cutter unit for successively pressing the clamps to their clamping positions. Each clamp has first and second components which include connecting parts interconnected to one another and clamping parts having cavities that complement one another to form the screw receiving space. The clamping part of the second component is bendable towards the clamping part of the first component when pressed by the press member.