Triangular screw is a device that can convert a small torsional force into a large pressure along the screw axis, which can pressurize and aggregate the two surfaces together. The advantage of triangular screw is that it can be self tapping. The hardness of some customers' products is relatively hard. Triangular screw just uses its self tapping attribute to better tap into the products. The triangular screw has a unique section shape and is used to reduce the friction force. A relatively small torque is sufficient to install the screws in place. With the rotation of the triangular screw, the parent thread with strength and hardness is also formed. The mechanical and self-locking characteristics of triangular screws greatly improve the loosening ability under vibration. A unique triangular outer contour makes the material flow to the buffer zone in the middle of those threads during installation, so as to provide a reliable fit and high exit torque. The possibility of loosening under vibration can be reduced without additional locking settings, such as Huasi and adhesive.
     What are the main factors affecting the pulling force of triangular screw? Let's introduce it below:
     The main factors affecting the pull-out force of triangular screw are as follows: the more the triangular screw enters the cortical bone thread, the stronger the pull-out force is; The cancellous bone screw with large thread of triangular screw is strong; Effect of triangular screw on bone quality: poor fixation in osteoporosis; The contact surface between bone and triangular screw affects the pulling force, the damage of tapped thread, improper operation, over tightening of triangular screw, tapping first and then sounding all affect the holding force.

Self tapping locking screw is also called triangular tooth locking screw. It does not need to be used with nut. Self tapping is locked on product materials. Since the self tapping locking screw is required to have the performance of self tapping low-carbon steel plate, it requires a high hardness surface to achieve cutting and extrusion ability. At the same time, there must be sufficient matching of core strength and toughness to prevent distortion or fracture during work. The self tapping locking screw generally adopts the heat treatment process. The self tapping locking screw is generally made of high carbon steel screw rod pier, and the production specification is generally m3-12. Generally no more than M12. Generally, the self tapping locking screw from the cold pier needs to be electroplated and hardened. After hard plating. The plating color is plated according to the color required by customers. Its production specifications and process methods are carried out according to the national standard of self tapping locking screw.

Requirements for heat treatment process of self tapping locking screw: whether low carbon steel, medium carbon steel or medium carbon alloy steel, self tapping locking screw shall be carburized, Quenched and tempered. The depth of the hardened layer is too shallow, and the surface hardness and torsional strength are insufficient. When screwing in, the thread teeth or deformation or sliding buckle; On the contrary, the hardened layer is too deep and easy to become brittle, either turn around or break. The sensitivity of hydrogen embrittlement is also high, which is closely related to tempering conditions and materials. Self tapping locking screw has a wide range of effective hardening layer depth specified in the standard. The purpose, size, material and tempering conditions of self tapping locking screw shall be considered, and the target value shall be increased or decreased appropriately within the specified range.

Now there are many kinds of anti-theft screws on the market. How to select anti-theft screws? The anti-theft screw is mainly made of stainless steel, which can be installed, non detachable and detachable. According to the structure, it can also be divided into inner triangular anti-theft screw, outer triangular anti-theft screw, Torx anti-theft screw, inner pentagonal anti-theft screw, Y-type anti-theft screw, eccentric hole anti-theft screw, etc.
First of all, the anti-theft screws need to be safe, including those with anti-theft caps, quality assurance and enterprise standard QB. This standard is reviewed, filed and approved by the State Bureau of technical supervision. It involves the current laws and regulations such as the centralization and standardization of relevant product industries and the mandatory standards of the superior, that is, the guarantee of the production technology of the enterprise.
Secondly, the simpler the anti-theft screw is, the better. It looks like a screw cap at a glance. You can probably know how to use and install it without looking at the instructions. You don't choose an anti-theft device with complex shape and structure, large volume and weight and strange appearance, or even a set of anti-theft system. Although it can also prevent theft, the cost and process complexity can not form mass production, It's not easy to promote it. And the selection of "parallel tightening type and back cap type" can effectively strengthen the fastening nut.
The anti-theft screw can be selected and easy to use. It can be installed with a special wrench without special and complex tools. There is no need to worry about installation. You can also choose anti-theft screws with beautiful appearance.

Combination screw needs to choose a company specializing in the production of combination screw. A company with production and sales experience. The price, quality, service and other purchasing factors of combination screws will also affect our choice. There are many enterprises producing combination screws all over the country. If you walk and look more, you can choose combination screws that meet our standards.
     The composite screw is made of iron and stainless steel. The composite screw has perfect fastening and crimping ability. It is a supporting high and low voltage contact, high and low voltage air conditioning wiring, and significantly improves the current and voltage of electrical appliances, power, frequency and performance of power supply. Compared with the traditional separation screw, it can save people, labor and time.
     Electroplating of combination screws generally refers to electroplating of iron combination screws. Electroplating can be divided into environmental protection and non environmental protection. The commonly used electroplating colors of combination screws include environmental protection color zinc, environmental protection blue zinc, environmental protection white zinc, environmental protection nickel, red color, white zinc, white nickel, etc. The purpose of cross recessed combination screw, hexagon combination bolt and self tapping combination screw is the same as that of corresponding cross recessed screw, hexagon head bolt and self tapping screw. The combination screw is convenient to use. Do not manually match the bolt, spring washer and flat washer. So it's more convenient. But the price is slightly more expensive than the sum of individual bolts, spring pads and flat pads. The main feature of these combination screws is that they are equipped with corresponding washers, which is very convenient to use.

Anti theft screws are common in the automotive industry. For example, the anti-theft screws on the vehicle license plate, such as the anti-theft screws on the vehicle tire, can make the vehicle license plate removable, but it only greatly protects the wheels and license plate from being stolen. With the rapid development of science and technology, the means of theft become better with the development of science and technology, We should also remember not to blindly believe that anti-theft screws can be 100% anti-theft.
According to the structure and various industries, anti-theft screws are divided into removable and non removable. The removable can also be divided into internal Pentagon anti-theft screws, Torx anti-theft screws, Y-type anti-theft screws, external triangle anti-theft screws, eccentric hole anti-theft screws, internal multi tooth and other structures. Our common anti-theft screws for vehicles usually use Torx structure. The anti-theft screw plays the role of anti-theft.

In the market, there are many kinds of hot-dip galvanized bolts, and the common proportions are cross pan head, cylindrical head hexagon socket bolts, etc., but why are there so many hot-dip galvanized bolts? There are three main reasons.
1. Reasons for bolt processing. Among the three different types of products, i.e. inner hexagon bolt, crosshead bolt and outer hexagon bolt, only the outer hexagon bolt is more suitable for hot-dip galvanizing. Because the thickness of the hot-dip galvanized bolt is relatively thick, basically more than 50 microns. Regardless of the impact on the thread, if it is a hot-dip galvanized bolt, because the bolt is designed with holes, it is easy to reduce the size of the hexagonal hole when the zinc layer is too thick, and it is difficult to make it rotate normally when installing tools. If the hexagon socket bolt must be hot-dip galvanized, the recommended specification is not less than M12. Only large-size hot-dip galvanized bolts can control the six holes in them from being affected.
Cross screws are not suitable for hot-dip galvanizing. The size of the screw is usually small, which has a great impact on the thread. If you are not careful, the line will be filled. On the other hand, the hole of the transverse groove is also easy to be filled with zinc layer, and the tool cannot rotate effectively during subsequent installation.
2. Cost reasons. In many installations, bolts are required to have corrosion resistance. If stainless steel bolts are used, the requirements can also be met. However, the price of stainless steel hexagon head bolts of the same specification is much higher than that of hot-dip galvanized bolts. If bolts are widely used, the cost of using hot-dip galvanized bolts will be greatly reduced after calculating the cost of the whole project. Other reduced costs are calculated at about 50%, and specifications of different sizes will fluctuate, so the cost difference is too large. This is also an important reason for the increase in the use of hot-dip galvanized bolts.
3. Bolts are widely used and very popular. In addition to buildings, we can see the scene created by bolts in our office and family.

Hexagon hardware bolt refers to the fastener composed of bolt head and screw. According to the material, it is divided into iron bolt and stainless steel bolt, namely hexagonal head electric hardware bolt-c and hexagonal head bolt (full thread) - C. the tin plating process is divided into two types according to the pH value of the plating solution: acid tin plating process and alkaline tin plating process. Tin is a silvery white metal with good weldability and ductility. It is widely used in electronics, food, automobile and other industries. The utility model has the advantages of alkaline tin plating, simple composition, good dispersion of plating solution, fine coating, few holes, good brazing performance, etc.

Why use safety non-standard screws and how to remove them?
When electric cars are stolen and office equipment is stolen, we will find that most of the time things are dismantled. If we don't dismantle things, because some things are too big to steal. If you also want to avoid prying open machinery and doors and windows, you can consider using safety non-standard screws.
Many people have heard of this screw, but they don't know why they use it. This kind of screw is mainly used to avoid being disassembled. There are no buckles on the surface of these screws, which means that an ordinary screwdriver cannot be removed at all. If you want to remove this screw, you must remove it with a professional tool. Using this screw can well protect users' privacy. As long as the user does not agree, it cannot be disassembled. Even if it is disassembled, there will be disassembly marks without supporting tools, so that users can know that someone has moved their own things. Some people may ask how to use this screw to remove it. If there is no way to remove it, doesn't it mean lifting a stone and stabbing yourself in the foot? Don't worry about this. When purchasing this kind of safety non-standard screw, the manufacturer will generally give a supporting disassembly tool, and there will be instructions to guide the use, so that the disassembly will be more convenient and will not be damaged.
The use of safety screw machine is actually to better protect their privacy and security. Because although there is a lock on the cabinet, as long as there are screws, it is not a big problem to remove it. But with these screws, it's impossible for someone to open the cabinet without your knowledge.

Difference between self tapping screw and self drilling screw
Self tapping screws and self drilling screws are two kinds of screws used in metal buildings, general buildings and many other applications and industries. Contrary to popular belief, the two words are not interchangeable. Usually, when our customers require self tapping screws, they actually need self drilling screws, and vice versa. Let's review the similarities, differences, and how to know when to use which type of screw.
Self tapping screw, as the name suggests, refers to the screw that can drive the thread into the material. Self tapping screws are used in a variety of materials, including wood, metal and brick. These screws cannot be drilled through metal, and a pilot hole needs to be pre drilled before installation. The guide hole is formed by a bit slightly smaller than the screw. When the screw is installed, the screw thread will hit metal or wood. This tapping action holds the material together. There are many different types of points, self tapping screws can help tap threads to various substrates.
Self drilling screws can be identified by the drill bit shape of the screw and are designed for various applications, such as fixing metal to metal and metal to wood. Self drilling screws do not require guide holes, which speeds up installation time, reduces cost and the need for additional bits. This additional function and cost saving feature makes self drilling screws a clear choice for metal building construction. Drilling points are numbers 1 to 5, and the amount of steel they can drill through increases with the increase of number points. In general, self drilling screws are used for light rail applications, but #5 drill bits can drill through and tighten 1 / 2 "steel. Self drilling screws are also threaded to some extent during installation.
In short, this is the confusion. All self drilling screws are self tapping screws, but all self drilling screws are not self drilling screws. Self drilling screws do not need guide holes, but they can also be tapped. Self tapping screws tap threads, but they cannot drill through metal, and they need a guide hole. These screws are not interchangeable. Mixing the two may cause many headaches or on-site Possible failure.

If you don't understand the use of these screw materials, as seen from the surface, self-locking screws are not much different from ordinary screws, but their actual uses and functions are quite different. Screws are commonly used to fix metal, wood, drywall and other building materials, or to fix something on these materials. Typically, screws are used with bolts or washers that are installed in place to reinforce the screws. All screws have a unique thread on the shaft called thread. Due to the thread, the screw must be pressed down and screwed into place. Tighten the thread into the material of the drive screw. To remove them, the screws must be screwed in or out in the opposite direction. Self tapping locking screws are determined by their thread angle. The threads of self tapping locking screws have a precise angle so that once the screws are placed, they will not slide or move unless some additional force is applied. After screwing the self tapping locking screw into place, it will not move unless it is removed from position with a screwdriver or similar tool. Even if a suitable tool is used, the self tapping locking screw must be unscrewed with force; They are designed to stay in place. The unique thread pattern of self tapping locking screw makes it a separate screw. Because of their design, you do not need to add bolts or lock washers to self tapping lock screws.
Always use a suitable screwdriver to place the self tapping locking screw in place. The screws are made of different heads, which are engraved so that the corresponding screwdriver can be locked in place. The screwdriver acts as a lever to turn the screw. If the screw is not set properly, it is difficult to remove it later.