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.

The steel structure enclosure system includes roofing system, wall system, lighting belt, edging and flooding, gutter and thermal insulation cotton. The enclosure system is one of the most important components of the light steel structure, which determines the ornamental appearance of the building, the waterproof and thermal insulation effect of the building. As an auxiliary fastener, self-drilling self-tapping screws play a vital role in the performance, quality and life of the overall building. It is not optimistic that as such an important basic component, our attention and research are far behind the attention and research on the main components of the building. The most prominent point is the neglect of the performance of fasteners and the main components of the building envelope system. match.

Stainless steel fasteners We often encounter the problem of stainless steel standard parts locking. So why do stainless steel fasteners always lock up? What is the reason! Why haven't you heard that the standard parts of iron do not lock up? This may be seen from the two materials of stainless steel and iron. Stainless steel standard parts are relatively soft and have good ductility. The hardness of stainless steel standard parts is SUS316. Compared with the hardness of iron standard parts, they are softer than iron standard parts of 8.8. Fastener users often reflect: Why do stainless steel fasteners sometimes lock up, and similar phenomena do not often occur when using carbon steel fasteners, are stainless steel fasteners softer and carbon steel? Why are fasteners relatively hard? That's right! There is a fundamental difference between stainless steel and carbon steel. Stainless steel has good ductility, but its hardness is somewhat different from carbon steel.

Today we will learn the terms related to metallurgy and heat treatment:

The main purpose of surface treatment is aesthetics and corrosion protection. Because the main function of the fastener is to fasten parts, and the surface treatment also has a great impact on its fastening performance. Therefore, when selecting the surface treatment process, factors such as the torque and consistency of the pre-tightening force of the fastener must be considered.

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.

The head of the self-tapping screw is pointed and can be used normally without drilling. Widely used in doors and windows and iron sheet. So do you know what are the forms of self-tapping screws? Let's take a look at the thread types of self-tapping screws together.