As a professional fastener salesman, it is necessary to understand and standardize the words to describe various fasteners with the national standard. As for the screws, screws and bolts that people often talk about, it is easy to confuse the professional titles of their types. The winning screw editor teaches you several ways to identify. 1. Screws: Actually. The standard statement is that there are no screws. Screws are commonly known as screws. From the perspective of appearance, those with external threads can be called "screws", which is a large-scale concept. 2. Screws: All fasteners composed of round heads and threaded rods/round rods are called screws, which must be tightened with a screwdriver and an Allen wrench, such as slotted cylinder head screws, slotted countersunk head screws, and cross recessed countersunk heads. Screws, hexagon socket head cap screws, hexagon socket head countersunk head screws, etc.; The screw is to screw the thread directly into the threaded hole of one of the connected parts, without using a nut. 3. Bolts: The head is generally hexagonal, the rod has external threads, and the fasteners tightened with a wrench are bolts, which are widely used in detachable connections in machinery manufacturing, generally with nuts (usually plus a washer). or two washers). 4. Nuts and nuts: The shape of the nut is usually hexagonal, and the inner hole is an inner thread. It is used to cooperate with the bolt and tighten the related parts. The nut is a common name, and the standard should be called "nut". More fastener names (you can contact the winning customer service) are also roughly classified and described according to their appearance and function, so we have to classify and distinguish the above three categories, and it is not difficult to find their characteristics. .