There are two differences between bolts and screws:
1. Bolts generally need to be used in cooperation with nuts, and the screws can be directly screwed on the base of the internal thread;

2. The bolt needs to be twisted and locked with a large distance, and the locking force of the screw is small. You can also see the grooves and threads on the head;

Those with grooves on the head can be determined as screws and drill tails, such as: slotted, cross groove, inner hexagon, etc., except for outer Inner and outer half hexagonal rivet nut cross;

Headed external thread screws that need to be installed by welding, riveting and other installation methods belong to screws;

Threads belong to self-tapping teeth, wood teeth, and triangular locking teeth belong to screws;

The remaining external threads are bolts.

Differences in the operation of screws and bolts



basic introduction:
1. Bolt: A type of fastener consisting of a head and a screw (a cylinder with an external thread), which needs to cooperate with a nut to fasten and connect two parts with through holes. This connection method is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection.
2. Screws: It is also a type of fastener composed of two parts: the head and the screw. It can be divided into three categories according to the use - machine screws, set screws and special purpose screws. Machine screws are mainly used for the fastening connection between a part with an internal threaded hole and a part with a through hole. The Dahe drill tail wire does not require the cooperation of a nut (this connection method is called screw connection, which is also acceptable. It can also be used in cooperation with nuts to fasten the connection between two parts with through holes. The set screw is mainly used to fix the relative position between the two parts. The special purpose screw has a lifting ring screw for For lifting parts
3. Self-tapping screw: similar to machine screw, but the thread on the screw is a special self-tapping screw thread. It is used to fasten and connect two thin metal components to make them a whole. Small holes need to be made in advance on the components. Due to the high hardness of this kind of screw, it can be directly screwed into the hole of the component, so that the The corresponding internal thread is formed in it. This connection method is also a detachable connection
4. Wood screw: It is also similar to machine screw, but the thread on the screw is a special thread for wood screw, which can be directly screwed into the wooden component (or part), used to connect a metal (or non-metal) with a through hole. The parts are fastened to a wooden element.