Thread forming screws have a trilobular thread form. These require a low level of assembly torque to initiate thread forming in sheet metal, castings and alloys. Further benefits: Screws form a female thread capable of accepting a standard metric machine screw should the need arise. The three lobed thread design allows the displaced parent material to cold flow into the relief areas of the screw thereby increasing the resistance to vibration and loosening of the screw.
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