方头螺钉.pptVIP

Chapter 18 Fasteners A fastener is any devices used to connect two or more components. There are hundreds of fastener types used in machine design. But the most common are threaded fasteners. Such as: 　Bolt（螺栓） , nut（螺母）, screw（螺钉）, 　　lag screw（方头螺钉）,set screw（紧定螺钉）, 　　washer（垫圈）。 Hex bolt and hex head cap screw A bolt is a threaded fastener design to pass a hole in the mating member and to be secured by tightening a nut from the end opposite the head of the head. A screw is a threaded fastener design to be inserted through a hole in one member to be connected and into a threaded hole in the mating member, no nut is needed. 18-2 other types of fastener and accessories Lock devices (锁紧装置） Type of thread connect * * Set screw (紧定螺钉）with different head and point styles used to hold a collar on a shaft