Abstract: The object of the invention is to make it possible to fill connecting fasteners of various thicknesses in a single kind of fastener magazine. A connecting fastener is such that the thickness of a connecting band (13a, 13b) is increased or decreased according to the stem diameter of a screw (12a, 12b), whereby the width of the connecting fastener (11a, 11b) as seen in the direction of travel thereof is made constant, and the connecting band (13a, 13b) is brought into engagement with a longitudinal guide groove (5a) formed in the fastener passageway of the fastener magazine (5) of a screw fastening machine. This makes it possible to stably hold the connecting fasteners (11a, 11b) of various stem diameters at a given height, thus improving the versatility of the fastener magazine.

Abstract: A plurality of screws (21) are aligned in parallel with each other, and head side portions (21b) of shaft portions (21A) of the screws are fixed, by a band (30) fixed to a strip sheet (31), to be band-shaped connected screws (20). Further, in the band-shaped connected screws (20), the head side portion (21b) of the shaft portion (21A) of each screw (21) is formed with an inverse screw thread (23) formed inverse direction to a screw thread (22) formed at the shaft portions (21A).

Abstract: The object of the invention is to make it possible to fill connecting fasteners of various thicknesses in a single kind of fastener magazine. A connecting fastener is such that the thickness of a connecting band (13a, 13b) is increased or decreased according to the stem diameter of a screw (12a, 12b), whereby the width of the connecting fastener (11a, 11b) as seen in the direction of travel thereof is made constant, and the connecting band (13a, 13b) is brought into engagement with a longitudinal guide groove (5a) formed in the fastener passageway of the fastener magazine (5) of a screw fastening machine. This makes it possible to stably hold the connecting fasteners (11a, 11b) of various stem diameters at a given height, thus improving the versatility of the fastener magazine.

Abstract: A plurality of screws (21) are aligned in parallel with each other, and head side portions (21b) of shaft portions (21A) of the screws are fixed, by a band (30) fixed to a strip sheet (31), to be band-shaped connected screws (20). Further, in the band-shaped connected screws (20), the head side portion (21b) of the shaft portion (21A) of each screw (21) is formed with an inverse screw thread (23) formed inverse direction to a screw thread (22) formed at the shaft portions (21A).

Abstract: A screwdriver used for a screw tightener includes at its tip portion a blade having a plurality of flat plate portions to be meshed in a recess formed in a head of a screw. In this screwdriver, each of the flat plate portions has at its tip portion an outer peripheral surface which extends in such a manner as to be converged in the direction toward the tip portion of the screwdriver. The outer peripheral surface of the flat plate portion is formed into an angled shape having a ridge line portion extending in the direction toward the tip portion of the screwdriver.