Self-tapping screw

[Object] To provide a self-tapping screw which is the most suitable for tightening a workpiece made of a soft material such as a resin or an aluminum alloy. [Solution] In the self-tapping screw 1 including a normal thread 10 and a female screw molding thread 12 having a larger diameter than that of...

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Bibliographische Detailangaben
Hauptverfasser:	ABE MASANORI, TORII SHINGO, YOKOTA MASANORI
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS ORMACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS,CLIPS, WEDGES, JOINTS OR JOINTING ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MECHANICAL ENGINEERING THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	[Object] To provide a self-tapping screw which is the most suitable for tightening a workpiece made of a soft material such as a resin or an aluminum alloy. [Solution] In the self-tapping screw 1 including a normal thread 10 and a female screw molding thread 12 having a larger diameter than that of the normal thread 10, out of pitches of the normal thread 10 positioned in a head portion side from the female screw molding thread 12, any one pitch is set to be larger than other pitches. The self-tapping screw 1 not only reduces driving torques but also improves fastening force, and thus can be applied to various workpieces made of the soft material as well as a hard material.