Differences between bolts...

"Screw" is just a general term for fasteners. It includes bolts, bolts and nuts. As long as there are threaded fasteners, bolts, nuts, bolts and bolts, they all have one thing in common, that is, they all have threads. What's the difference besides threads? The following chapters introduce bolts, bolts and bolts for you. What's the difference? How to distinguish screw fasteners? Let's get to know it together.

Differences between bolts, screws and studs? Skillful identification of screw fasteners

Bolts: Mechanical parts, cylindrical fasteners with threads with nuts. A type of fastener consisting of a head and a screw (a cylinder with external threads) is required to be fitted with a nut to fasten and connect two parts with through holes. This connection form is called bolt connection. If the nut is screwed off from the bolt, the two parts can be separated, so the bolt connection belongs to the removable connection.

2. Screw: No head, only a kind of fastener with threads at both ends. When connecting, one end must be screwed into the part with internal thread hole, the other end must pass through the part with through hole, and then the nut is screwed up, even if the two parts are tightly connected as a whole. This form of connection is called stud connection and also belongs to removable connection. It is mainly used in situations where one of the connected parts is thicker, requires compact structure, or is not suitable for bolted connection because of frequent disassembly.

3. Screw: It is also a kind of fastener consisting of head and screw. It can be divided into three categories according to its use: machine screw, fastening screw and special purpose screw. Machine screw is mainly used for fastening parts with fixed threaded holes, and the fastening connection between parts with through holes does not require nut coordination (this connection form is called screw connection, also belongs to removable connection; it can also be used with nuts for fastening connection between two parts with through holes. ) Fixing screw is mainly used to fix the relative position between two parts. Special purpose screw such as ring screw for lifting parts.

Classified use

1. BM = 1D studs are generally used for the connection between two steel connected parts; BM = 1.25d and BM = 1.5D studs are generally used for the connection between cast iron connected parts and steel connected parts; BM = 2D studs are generally used for the connection between aluminum alloy connected parts and steel connected parts. The former connector has internal thread holes, and the latter connector has through holes.

2. The threads at both ends of the equal-length double-headed stud should be matched with nuts and washers for two connecting parts with through holes.

One end of the welding stud is welded on the surface of the connected parts, and the other end (thread end) passes through the connected parts with through holes. Then a gasket is inserted and a nut is screwed on, so that the two connected parts are connected as a whole.