Wood-metal drill screw

摘要: There is disclosed screw adapted to fasten two or more juxtaposed workpieces which comprises a threaded shank defining an axis and major thread diameter. A drilling tip provided extends from the includes pair of cutting edges. Material removing extensions are formed continuously with edges serve extend edge in radially outward direction at least as far outermost extent The frangible will fracture when material predetermined hardness encountered. As such fastener for first, enlarged bore first workpiece relatively soft material, second smaller harder metal, like.