Patent ID: 7195437

Claim:
A screw for a prepared hole in a workpiece, comprising: a head adopted for engagement with a driver bit; a shank integrally formed with the head having a lived portion connected to the head and an end portion with an end opposite to the head, the shank having external threads from the head to the end with a female-thread forming portion at the end portion having an external diameter larger than the external diameter of the threads on the head portion; and a coating covering at least 60% of a length of the shank, starting from the end, the coating including microcapsules containing viscous fluid with a viscosity between 200 cP to 500 cP a characteristic of retaining fluidity for at least a six month period of time from a first arc of the screw, wherein a flash point of the viscous fluid is at 260 degrees centigrade or higher.