A micro screw, a micro nut, an outer micro gear, an internal micro gear, a helical micro gear, a micro turbine-impeller and other micro mechanical parts are developed by utilizing extra fine wires. The extra fine wires are metallic wires or synthetic fibers which diameters are as small as 30 to 200 micrometers like a stainless wire, a tungsten wire, a copper wire, and a fluorocarbon thread. The micro screw is produced by coiling a pair of these wires around a needle pin without spacing, and by brazing the wires on the pin; besides, by peeling one wire from the brazed pin. Its pitch is less than 100 micrometers, and its major diameter is less than 600 micrometers. Other micro mechanical parts are also produced by same processes. In this paper, a novel manufacturing method for the micro mechanical parts utilized extra fine wires is developed, and several micro mechanical parts are produced as prompt products. Moreover, a micro positioning stage and reduction micro gear systems are developed as trial manufactures, and the micro turbine system is proposed as a new engine for the micro systems without electrostatic or magnetic drives.