Hydrogen embrittlement fracture of bolts is a common form of failure. Because hydrogen embrittlement fracture is delayed and concealed, the damage it brings is much greater than the damage caused by other fractures. Since this century, hydrogen embrittlement fractures of alloy steel bolts have been commonplace, seriously hindering the normal development order of aerospace models, and have reached the level of "talking about hydrogen discoloration". In order to enable more scientific and technical personnel to understand the mechanism of hydrogen embrittlement, grasp the law of hydrogen embrittlement of bolts, and effectively prevent the occurrence of hydrogen embrittlement of bolts, the results of these studies are now written and introduced for readers' reference.

Hydrogen embrittlement fracture of bolts is a common form of failure. Because hydrogen embrittlement fracture is delayed and concealed, the damage it brings is much greater than the damage caused by other fractures. Since this century, hydrogen embrittlement fractures of alloy steel bolts have been commonplace, seriously hindering the normal development order of aerospace models, and have reached the level of "talking about hydrogen discoloration". In order to enable more scientific and technical personnel to understand the mechanism of hydrogen embrittlement, grasp the law of hydrogen embrittlement of bolts, and effectively prevent the occurrence of hydrogen embrittlement of bolts, the results of these studies are now written and introduced for readers' reference.

Screw is a combination of simple machines—it is, in essence, an inclined plane wrapped around a central shaft, but the inclined plane (thread) also comes to a sharp edge around the outside, which acts a wedge as it pushes into the fastened material, and the shaft and helix also form a wedge in the form of the point. Some screw threads are designed to mate with a complementary thread, known as a female thread (internal thread), often in the form of a nut, or object that has the internal thread formed into it. Other screw threads are designed to cut a helical groove in a softer material as the screw is inserted. The most common uses of screws are to hold objects together and to position objects.

Fastener is a kind of mechanical part which is widely used for fastening connection. It is widely used in various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemicals, instruments and supplies. It is the most widely used mechanical foundation. It is characterized by a wide variety of specifications, different performance uses, and standardization, seriation, generalization of the degree is also very high. Therefore, some people also call a kind of fastener with existing national standards as standard fastener, or referred to as standard fastener for short.

Self tapping screws are mostly used for the connection between thin metal plates. When connecting, first make a threaded bottom hole for the connected piece, and then screw the self-tapping screw into the threaded bottom hole of the connected piece. So what are the characteristics of self tapping screws? Next, I will introduce the characteristics of self tapping screws in detail for everyone.

Pan-head screws and round-head screws are often difficult to distinguish because of their similar appearances. In fact, different screw head types have different uses. Below we introduce the difference between round head screws and pan head screws, I hope it will be helpful to everyone.

The head of the self-tapping screw is pointed and has threads. It can be used when drilling is required. It is mainly used in wall panels, furniture, roofs and other places. The following describes the types of self-tapping screws for everyone, I hope to help you.

Among the fastener products, the use of stainless steel screws is widely used in practical applications. We use stainless steel screws in actual production, processing and life. The types of stainless steel screws used in different environments and places are also different. Today, I would like to talk about the advantages and disadvantages of stainless steel screws, I hope to help everyone.

Stainless steel machine screws are a common type of fasteners. Stainless steel machine screws break when used. What is the reason? How to identify the quality of Stainless steel machine screws? Let's take a look at the causes and quality identification methods of Stainless steel machine screws breaks. I hope to help everyone.

Pan head self-tapping screws have good fastening properties and are not easy to corrode. They are widely used in construction, factory and furniture industries. Today, Xiaobian talks about the production process of the Pantou self-tapping screws, and I hope to help everyone.