In daily life, we often mention bolts, screws, screws, studs, nuts, nuts, etc. Do you know what the difference is? In fact, the standard saying is that there are no screws and nuts. Screws are just common names, as long as they have external threads, they are called "screws". The nut is also commonly known, and the standard argument should be called a nut (and the shape of the nut is usually hexagonal, and the inner hole is internal thread, used to cooperate with the bolt to strengthen the related parts.).
Standard fasteners are divided into twelve categories, which are determined according to the use occasion of the fastener and its use function. The following mainly introduces four standard fasteners: bolts, screws, nuts and studs.
Standard fastener bolts: cylindrical threaded fasteners with nuts. It is a type of fastener composed of two parts, a head and a screw. It needs to be matched with a nut to fasten and connect two parts with through holes. This connection form is called bolt connection (bolt connection is a detachable connection ).
Standard fastener screws: commonly used in machinery, electrical appliances and buildings, etc. The general material is metal or plastic, cylindrical, and grooves with uneven surfaces are called threads. The screw is mainly used to join two objects, or to fix the position of the object. Screws can usually be removed or re-tightened at will without compromising their effectiveness. Generally, the diameter of the top of the screw is relatively large, such as round, square or regular hexagon. The most common grooves on the top have a font, cross and square.
Standard fastener nut: a metal piece used for fixing, with a hole in the middle and a thread on the inside. Nuts are often used for screws that match their size to fix their related joints. The nuts are mostly hexagonal, followed by squares.
Studs of standard fasteners: there is no head, only a type of fastening metal parts with external threads on both ends. When connecting, one end must be screwed into the metal part with an internal threaded hole, and the other end must pass through the metal part with a through hole, and then screw the nut to make the two or more metal parts tightly connected. A whole.