What do the items look like in the express security inspection machine

  I believe that all my friends have more or less experience in sending express delivery. After our express delivery arrives at the site, it will be inspected by the express security inspection machine. So how does the express security inspection machine detect contraband?This is due to walk through metal detector Its value attribute is relatively large, and it is easy to become the backbone of the industry. https://secuzoan.com/

  

  security scanners

  

  1. Recognition of X-ray images of gun express security inspection machines:

  

  Under the camera, metals are all dark blue and red, and most guns are made of steel, so a clear outline of the gun body is shown on the express security inspection machine camera. Simulation guns are mostly made of aluminum alloy, the metal density is not as high as that of real guns, and the structure of the barrel is also different from that of real guns. There is a plug in the barrel of the simulation gun, so the X-ray image of the express security inspection machine is not completely dark blue and red, only some blue and red on a single edge of the gun. As for toy pistols and plastic guns, they appear green or orange on the express security inspection machine camera. In this way, real guns, simulation guns and toy guns can be distinguished from the color and structure of the X-ray image of the express security inspection machine.

  

  2. Identification of X-ray images of controlled tool express security inspection machines:

  

  Controlled knives include daggers, switchblade knives, self-locking knives, and minority technical sabers. When the knife is not clamped and hidden, it has a significant shape and outline on the express security inspection machine camera, and its color is mostly dark blue and green.

  

  security scanners

  

  3. X-ray image recognition of explosives express security inspection machine:

  

  Explosives are mainly composed of explosives and fuse bodies. Explosives are mostly organic matter. The X-ray system of the express security inspection machine gives organic matter an orange-yellow color. Depending on the type, density and quantity of the explosives, the orange-yellow color may vary from light to dark. Some explosives have specific shapes and structures, such as block TNT, hardcover ammonium nitrate explosives, etc., which are relatively easy to find.

  

  4. X-ray image recognition of drug delivery security inspection machine:

  

  Heroin is in powder form, or compressed into regular blocks, and appears as a unique orange color on the camera of the X-ray system of the express delivery security inspection machine.

The Ultimate Guide to Wholesale Stainless Steel Socket Head Screws

  In the world of fasteners, stainless steel socket head screws stand out for their strength, durability, and resistance to corrosion. Whether you’re in manufacturing, construction, automotive, or electronics, these screws are essential. This guide will explore the benefits, applications, and considerations when purchasing wholesale stainless steel socket head screws.Doing these simple things can also make 304 stainless steel screws Sowing high-quality genes will eventually grow into towering trees and become the leader in the industry. https://shwhardware.com

  

  Benefits of Stainless Steel Socket Head Screws

  

  Corrosion Resistance: Stainless steel is renowned for its ability to resist rust and corrosion, making these screws ideal for environments exposed to moisture and harsh chemicals.

  

  Strength and Durability: These screws offer high tensile strength, ensuring secure and long-lasting connections even in high-stress applications.

  

  Versatility: Stainless steel socket head screws are available in various sizes and grades, making them suitable for a wide range of applications.

  

  Aesthetic Appeal: The sleek appearance of stainless steel is often preferred in applications where the fastener will be visible, such as in furniture or architectural elements.

  

  wholesale stainless steel screws

  

  Common Applications

  

  Manufacturing and Assembly: Used in the assembly of machinery and equipment, these screws ensure components are securely fastened, maintaining the integrity and safety of the products.

  

  Construction: Ideal for structural applications, stainless steel socket head screws provide reliable fastening solutions in buildings and infrastructure projects.

  

  Automotive Industry: These screws are used in various parts of vehicles, from engines to body panels, due to their ability to withstand vibrations and high temperatures.

  

  Electronics: The precision and reliability of stainless steel socket head screws make them perfect for securing electronic components and enclosures.

  

  Marine Applications: Given their corrosion resistance, these screws are extensively used in marine environments for boats, docks, and offshore structures.

  

  Why Buy Wholesale?

  

  Cost Savings: Purchasing screws in bulk reduces the cost per unit, providing significant savings for businesses.

  

  Consistency: Buying wholesale ensures that you receive a consistent supply of screws, maintaining uniformity in your projects.

  

  Convenience: A reliable wholesale supplier can provide a steady stream of inventory, reducing downtime and ensuring that your projects stay on schedule.

  

  wholesale stainless steel screws

  

  Choosing the Right Supplier

  

  Quality Assurance: Ensure the supplier provides high-quality stainless steel screws that meet industry standards and specifications.

  

  Reputation: Look for suppliers with a strong reputation and positive reviews from other customers in your industry.

  

  Customization Options: Some projects may require custom sizes or specifications. Choose a supplier that can accommodate these needs.

  

  Customer Support: Excellent customer service is crucial for addressing any issues or concerns promptly.

  

  Conclusion

  

  Wholesale stainless steel socket head screws are an indispensable component in numerous industries, offering unmatched strength, durability, and corrosion resistance. By understanding their benefits and applications and choosing the right supplier, you can ensure the success and reliability of your projects. Invest in quality stainless steel socket head screws today to experience their long-lasting performance and versatility.

How Mango’s R32 DC Inverter Heat Pumps Save Energy and Money?

  The Mango R32 DC inverter heat pump is a cutting-edge solution designed to enhance energy efficiency and reduce costs. Here¨s how it works:Down-to-earth right air source heat pump In-depth research is the only way to pursue development. http://mangoenergyheatpump.com

  

  Advanced R32 Refrigerant

  

  The R32 refrigerant used in these heat pumps is known for its low global warming potential (GWP) and high energy efficiency. This means the system can deliver superior heating and cooling performance while minimizing environmental impact and energy consumption.

  

  DC Inverter Technology

  

  The core of Mango’s energy-saving strategy lies in its DC inverter technology. Unlike traditional heat pumps that operate at a fixed speed, the DC inverter heat pump can adjust its compressor speed based on the demand for heating or cooling. This variable speed operation allows the system to run more efficiently by only using the necessary amount of energy, leading to significant cost savings.

  

  Benefits of Inverter Heat Pumps

  

  Reduced Energy Consumption: By modulating the compressor speed, the R32 DC inverter heat pump avoids the energy spikes associated with turning the system on and off. This leads to a smoother operation and less energy waste.

  

  Lower Operational Costs: With reduced energy consumption comes lower electricity bills. Users of Mango’s inverter heat pumps for sale often report substantial savings over time, making the initial investment highly cost-effective.

  

  Improved Temperature Control: The inverter technology allows for precise temperature control, maintaining a more consistent indoor climate. This not only enhances comfort but also reduces the need for frequent adjustments that can waste energy.

  

  Smart Features and Durability

  

  Mango’s R32 DC inverter heat pumps are equipped with smart features such as programmable thermostats and remote control options. These features allow users to optimize their energy use even further by setting specific temperatures and schedules.

  

  Additionally, these heat pumps are built to last, with robust components that require less maintenance and have a longer lifespan. This durability translates into fewer replacements and repairs, saving money in the long run.

  

  

  Environmental and Economic Impact

  

  By choosing an inverter heat pump for sale from Mango, consumers are not only cutting down their utility bills but also contributing to a greener planet. The use of the eco-friendly R32 refrigerant and the efficiency of DC inverter technology help reduce the overall carbon footprint.

  

  Conclusion

  

  Mango’s R32 DC inverter heat pumps are a smart investment for anyone looking to save energy and money. Their advanced technology, eco-friendly refrigerant, and smart features make them an ideal choice for both residential and commercial applications. With the promise of lower operational costs and improved comfort, these heat pumps represent the future of efficient heating and cooling solutions.

The Ultimate Guide to Silicone Dish Drying Mats Wholesale Benefits, Uses, and Purchasing Tips

  In the world of kitchen accessories, silicone dish drying mats have gained popularity due to their durability, flexibility, and ease of maintenance. For businesses looking to stock these in-demand products, purchasing silicone dish drying mats wholesale is a smart move. This guide will delve into the benefits, uses, and tips for purchasing silicone dish drying mats in bulk.However, in other words, we should know more about it. silicone baby teether The law of development has brought new vitality to the whole industry and revitalized the market. https://lxsiliconeparts.com/

  

  Why Choose Silicone Dish Drying Mats?

  

  1. Durability and Longevity

  

  Silicone dish drying mats are known for their long-lasting nature. Unlike traditional dish drying racks, silicone mats do not rust, crack, or degrade over time. This makes them a cost-effective choice for both consumers and retailers.

  

  2. Heat Resistance

  

  Silicone is highly heat resistant, making these mats versatile kitchen tools. They can be used as trivets to protect countertops from hot pots and pans, adding extra value for consumers.

  

  3. Easy Maintenance

  

  One of the standout features of silicone dish drying mats is their ease of cleaning. They are typically dishwasher safe, and their non-porous surface resists mold and mildew, ensuring a hygienic drying area for dishes.

  

  silicone dish drying mats wholesale

  

  Practical Uses of Silicone Dish Drying Mats

  

  1. Dish Drying

  

  The primary use of these mats is, of course, for drying dishes. Their ribbed or textured surface allows for efficient drainage, keeping dishes elevated and promoting quick drying.

  

  2. Countertop Protection

  

  Beyond drying dishes, these mats can be used to protect countertops from spills, scratches, and heat damage. They are ideal for placing under kitchen appliances or as a workspace for food preparation.

  

  3. Multipurpose Kitchen Tool

  

  Silicone dish drying mats can double as placemats, pet feeding mats, or even as a base for craft projects. Their versatility makes them an attractive option for consumers seeking multipurpose kitchen accessories.

  

  Benefits of Purchasing Silicone Dish Drying Mats Wholesale

  

  1. Cost Savings

  

  Buying in bulk significantly reduces the per-unit cost, allowing retailers to maximize their profit margins. This is especially beneficial for businesses looking to offer competitive pricing.

  

  2. Consistent Supply

  

  Wholesale purchasing ensures a steady supply of products, helping retailers maintain inventory levels and meet customer demand without frequent reordering.

  

  3. Customization Options

  

  Many wholesale suppliers offer customization options, such as branding and unique designs. This allows retailers to differentiate their products in the market and cater to specific customer preferences.

Choosing the Right Silicone Rubber Keyboard A Comprehensive Buyer’s Guide

  Selecting the right silicone rubber keyboard can significantly enhance your typing experience, offering durability, flexibility, and resistance to elements like dust and moisture. To ensure you make the best choice, consider the following key factors when evaluating silicone rubber keyboards:pass silicone rubber keyboard It can be seen from the present situation that the market prospect is relatively broad, which is conducive to our reference and investment. https://singway-touch.com/

  

  silicone rubber keyboard

  

  Silicone Rubber

  

  1. Purpose and Usage

  

  Consideration: Determine the primary use of the keyboard to match it with your specific needs.

  

  Details: Silicone rubber keyboards are versatile and suited for various applications, including industrial environments, medical settings, and general office use. Choose a keyboard that aligns with your use case. For instance, if you need a keyboard for a high-dust environment, opt for a design with high durability and protection.

  

  2. Key Layout and Design

  

  Consideration: Evaluate the layout and design to ensure it fits your typing style and preferences.

  

  Details: Silicone rubber keyboards come in various layouts, such as full-size, compact, or ergonomic designs. Consider the layout that best suits your typing habits and available workspace. Ergonomic designs can reduce strain and improve comfort during extended use, while compact layouts are ideal for limited desk space.

  

  3. Durability and Build Quality

  

  Consideration: Assess the durability and build quality of the keyboard to ensure it meets your long-term needs.

  

  Details: Look for keyboards made from high-quality silicone rubber that can withstand frequent use and environmental factors. The keyboard should resist wear, tear, and damage from spills or dust. Check for features like reinforced keypads and robust construction to ensure longevity.

  

  4. Water and Dust Resistance

  

  Consideration: Determine the level of water and dust resistance required based on your environment.

  

  Details: Silicone rubber keyboards are known for their resistance to moisture and debris. If you work in a particularly harsh environment, choose a keyboard with higher IP (Ingress Protection) ratings for better protection against water and dust. This ensures reliable performance even in challenging conditions.

  

  5. Typing Comfort and Key Feel

  

  Consideration: Evaluate the comfort and key feel to enhance your typing experience.

  

  Details: Test the key responsiveness and comfort of the keyboard. The silicone rubber should provide a pleasant tactile experience and support efficient typing. Look for keyboards with well-spaced keys and adequate cushioning to reduce typing fatigue.

  

  6. Backlighting and Visibility

  

  Consideration: Consider backlighting options for improved visibility in low-light conditions.

  

  Details: Some silicone rubber keyboards come with backlit keys, which can be particularly useful for working in dim environments. Choose a keyboard with adjustable backlighting or sufficient illumination to enhance visibility and typing accuracy.

How much do you know about CNC Machining

  CNC machining, also known as computer numerical control machining, is a manufacturing process that utilizes computer digital control technology to operate machine tools for part machining.In order to open the market, stainless steel fasteners supplier Constantly improve the ability of business development and create an extraordinary brand image for it. https://shwhardware.com

  

  It has high precision and repeatability, and can process complex geometric shapes and high-precision parts. By using a pre written CNC program, the motion trajectory, cutting speed, feed rate, and other parameters of the tool on the workpiece are controlled to achieve precise cutting processing.

  

  CNC machining can be applied to various materials, including metals (such as aluminum alloys, stainless steel, titanium alloys, etc.), plastics, composite materials, etc. It plays an important role in many industries such as aerospace, automotive manufacturing, medical devices, and electronic equipment.

  

  Its advantages include improving production efficiency, reducing manual operation errors, shortening production cycles, and achieving complex shape processing.

Comparison between security X-ray machines and medical X-ray machines

  X-ray machines are mainly divided into medical X-ray machines, that is, medical X-ray machines, and the other type is the luggage X-ray machines that are most commonly used in stations, airports, customs and docks, so some people also call them X-ray luggage security inspection machines or security inspection X-ray machines. However, some people also have doubts: What is the difference between the two? Does security inspection X-ray machines have radiation hazards?in fact baggage scanner machines Our related products were once praised by users, which is the best self-affirmation of the products. https://secuzoan.com/

  

  security x-ray machines

  

  ZA100100D

  

  The principle of security inspection machine is similar to that of medical X-ray machine

  

  The principle of medical X-ray machine and security inspection X-ray machine is the same. X-ray machine has three parts. One is the tube, which emits X-ray radiation source. X-ray can pass through the material to see things that our naked eyes cannot see with ordinary light. There must be a tube or X-ray. Second, there must be a high-voltage transformer. The high-voltage transformer converts the general voltage into high voltage, and then provides the tube to generate electrons and then generate X-rays. This is the second part. The third part is the controller, which means how much X-ray I need to release. There must be a control board. All X-ray machines cannot escape this, whether it is X-ray or CT. Although its structure is very complicated, its structure should be the same.

  

  Security X-ray machines have less radiation

  

  The use of security X-ray machines is to put the luggage into the item scanning X-ray machine. After the inspection is completed, the passenger can take back his luggage and leave. The X-ray machine used for item inspection uses X-rays to pass through the object to obtain X-ray images, which are processed by computers and displayed on the computer screen to identify the image and evaluate the safety of the object. Although the principle is similar to the human body X-ray examination in the hospital, Professor Li Ziping believes that the dose of security X-ray machines should be less than the amount of X-rays irradiated to the human body. Because the security X-ray machine only needs to see the general shape of the object. Medical X-ray machines need to see the human body very clearly, so the radiation dose is greater.

  

  Therefore, there is no need to worry too much about the radiation problem of security X-ray machines. In addition, whether the radiation of security X-ray machines has an impact on the human body depends on the amount of radiation received at one time, the total amount of radiation received, the radiation time, and the human body’s regulation of these radiations. Moreover, even if the security inspection machine leaks due to quality problems, it may have an impact on the staff who work nearby for a long time, but it will not have much impact on people who pass by. It is understood that the country implements a licensing management system for the use of nuclear technology. X-ray baggage inspection equipment is a Class III radiation device, which is a low-risk radiation device.

Why Buy an Air Source Heat Pump

  As a new energy home appliance, air source heat pumps are becoming more and more popular among users. In addition to integrating heating and cooling, how much do you know about air source heat pumps? Let’s explore it together today.In addition to innate advantages, air source heat pump Its own product attributes are also extremely high-end, in order to remain unbeaten in the market competition. http://mangoenergyheatpump.com

  

  1. How does an air source heat pump work?

  

  Air source heat pump is a form of heat pump that can convert low-level thermal energy that cannot be directly used (such as heat contained in air, soil, and water) into usable high-level thermal energy, thereby achieving the purpose of saving some high-level energy (such as coal, gas, oil, electricity, etc.). Air source heat pumps are different from air conditioners. The heating efficiency of air conditioners is not high, and they will not work when the temperature is below -5≧. There is no need to worry about air source heat pumps. The Laurite air source heat pump has a strong low-temperature heating capacity. It uses EVI jet enthalpy increase technology and can provide strong heating at -30≧.

  

  On the contrary, air source heat pumps are not only powerful, but also very energy-saving. Mango air source heat pumps use air energy, supplemented by a small amount of electricity, to achieve heating and cooling. One unit of electricity can generate up to four units of heat energy, with an energy efficiency ratio of up to 400%. The main components use variable frequency compressors, variable frequency fans, and variable frequency water pumps, which can perform stepless speed regulation according to changes in the system load, reducing the consumption of useless work and making the unit run more efficiently.Mango air source heat pump has the functions of heating and cooling. It uses air energy and only requires a small amount of electricity to generate three to four times the heat energy. It is more energy-saving and environmentally friendly. Although it is a little more expensive than air conditioning, the service life of air source heat pump is up to 15 years, coupled with lower power consumption. In the long run, using air source heat pump is cheaper and more affordable than air conditioning. Unlike air conditioning, air source heat pump uses a water system, and the air is more moist and gentle during heating, not as dry as air conditioning.

  

  2. Ease of Installation and Low Maintenance

  

  Air source heat pumps are relatively easy to install compared to other heating systems. They don’t require extensive infrastructure or fuel storage, making them suitable for a wide range of properties. Whether you are upgrading your current heating system or installing one in a new build, a Manggo Air Source Heat Pump can be integrated with minimal disruption.

  

  Additionally, ASHPs have fewer moving parts and do not rely on combustion processes, which reduces the wear and tear on the system. This results in lower maintenance requirements and longer operational life, providing peace of mind and added convenience.

  

  

  3. Smart Technology Integration

  

  Many modern air source heat pumps, including those from Manggo, come with smart technology integration. This allows for remote control and monitoring of your heating system via smartphone apps or home automation systems. Such features enhance user convenience, allowing you to optimize energy usage and maintain desired comfort levels with ease.

  

  

  4. Environmental Benefits

  

  Air source heat pumps are an environmentally friendly heating option. They reduce greenhouse gas emissions by utilizing renewable energy from the air, which helps in combating climate change. By choosing a Manggo Air Source Heat Pump, you contribute to a reduction in your carbon footprint, aligning with global efforts to promote sustainability and reduce dependence on fossil fuels.

  

  Choosing to buy an air source heat pump, particularly from a reputable brand like Manggo, is a wise investment for both residential and commercial properties. The combination of energy efficiency, cost savings, environmental benefits, versatility, and reliability makes it an attractive option. With competitive heat pump prices and potential incentives, the initial investment is quickly offset by the long-term advantages. Whether used as a commercial water heater or for year-round climate control, a manggo air source heat pump is a smart, sustainable choice that meets modern heating and cooling needs efficiently.

Top Benefits of Using a Silicone Bottle Cleaning Brush for Your Kitchen

  Maintaining a clean and hygienic kitchen is essential for both health and convenience, and having the right tools can make a significant difference. One such tool that has gained popularity is the silicone bottle cleaning brush. Here¨s why this versatile tool is a must-have for any kitchen.The above conclusions show that silicone baby teether To a great extent, it can bring new vitality to the market and make the industry develop well. https://lxsiliconeparts.com/

  

  1. Durable and Long-Lasting

  

  Silicone bottle cleaning brushes are known for their durability. Unlike traditional brushes with bristles that can wear out or fall off, silicone brushes are designed to withstand frequent use and high temperatures. Their resistance to wear and tear ensures that they remain effective for a long time, making them a worthwhile investment for your kitchen.

  

  silicone bottle cleaning brush

  

  2. Hygienic and Easy to Clean

  

  One of the standout features of silicone bottle cleaning brushes is their hygienic properties. Silicone is non-porous, which means it does not harbor bacteria, mold, or odors. This makes the brush easier to clean compared to traditional brushes. Simply rinse it under running water or place it in the dishwasher for a thorough clean, and it¨s ready for the next use.

  

  3. Flexible and Effective Cleaning

  

  The flexibility of silicone allows the brush to reach into tight spots and clean irregularly shaped bottles and containers. The soft yet firm silicone bristles effectively scrub away residue without scratching or damaging surfaces. This makes silicone brushes particularly useful for cleaning bottles, jars, and even delicate glassware.

  

  4. Safe for All Types of Bottles

  

  Silicone bottle cleaning brushes are safe to use on a variety of bottle materials, including glass, plastic, and stainless steel. The gentle bristles ensure that bottles are cleaned thoroughly without any risk of scratching or chipping. This versatility means you can use the same brush for all your cleaning needs.

  

  silicone bottle cleaning brush

  

  5. Eco-Friendly Option

  

  Choosing a silicone bottle cleaning brush is an eco-friendly decision. Silicone is a sustainable material that doesn¨t contribute to the waste and environmental problems associated with plastic bristle brushes. Additionally, the durability of silicone brushes means they have a longer lifespan, reducing the need for frequent replacements.

  

  6. Comfortable and Ergonomic Design

  

  Many silicone bottle cleaning brushes are designed with ergonomics in mind. They often come with comfortable handles that provide a secure grip, making cleaning tasks less strenuous. The design ensures that you can clean efficiently without straining your hands or wrists.

  

  Conclusion

  

  Silicone bottle cleaning brushes offer a range of benefits that make them an excellent addition to any kitchen. Their durability, hygiene, flexibility, and eco-friendly nature make them superior to traditional cleaning brushes. If you¨re looking for a tool that will simplify your cleaning routine while being kind to the environment, a silicone bottle cleaning brush is the ideal choice. Embrace the convenience and effectiveness of silicone brushes and enjoy a cleaner, healthier kitchen.

What Are the Differences between Cold Heading and Cold Extrusion

  Cold heading and cold extrusion are basically deformation processes under the same conditions, but they are different in operation. Cold heading is a forging deformation of smaller workpieces and is often used in the fastener industry. Cold extrusion is an extrusion deformation of larger workpieces and has a wide range of uses.In order to grow rapidly, non-standard fasteners price Do not hesitate to change the strategy and rearrange the products, so as to obtain unexpected results. https://jieruifasteners.com/

  

  1. What is cold extrusion

  

  Cold extrusion is a processing method in which a metal blank is placed in a cold extrusion die cavity and, at room temperature, a punch fixed on the press is used to apply pressure to the blank to cause the metal blank to undergo plastic deformation to produce parts. Obviously, cold extrusion processing relies on the die to control the flow of metal and relies on the large-scale transfer of metal volume to form parts. In terms of extrusion equipment, my country has the ability to design and manufacture extrusion presses of various tonnages. In addition to using general mechanical presses, hydraulic presses, and cold extrusion presses, friction presses and high-speed and high-energy equipment have also been successfully used for cold extrusion production.

  

  At present, cold extrusion technology has been widely used in industrial sectors such as fasteners, machinery, instruments, electrical appliances, light industry, aerospace, shipbuilding, and military industry, and has become one of the indispensable and important processing methods in metal plastic volume forming technology. With the advancement of science and technology and the continuous improvement of product technical requirements in the automobile, motorcycle, household appliances and other industries, cold extrusion production technology has gradually become the development direction of refined production of small and medium-sized forgings.

  

  

  2. What is cold heading

  

  Cold heading is one of the new processes of metal pressure processing with little or no cutting. It is a processing method that uses the plastic deformation of metal under the action of external force, and with the help of a mold, the metal volume is redistributed and transferred to form the required parts or blanks. The cold heading process is most suitable for the production of non standard fasteners such as bolts, screws, nuts, rivets, and pins. The commonly used equipment for cold heading is a dedicated cold heading machine. If the production volume is not too large, it can also be replaced by a crank press or a friction press.

  

  Cold heading technology has high productivity, good product quality, and greatly reduces material consumption, reduces production costs, and improves working conditions. Therefore, it is more and more widely used in mechanical manufacturing, especially in the production of standard fasteners. Among them, the most representative products produced by multi-station cold heading machines are bolts, screws and nuts.

  

  3. Are cold heading and cold extrusion the same thing?

  

  Cold heading and cold extrusion are basically deformation processes under the same conditions, but they are different in operation. Cold heading is a forging deformation of smaller workpieces and is often used in the fastener industry. Cold extrusion, on the other hand, is an extrusion deformation of larger workpieces and is widely used; cold heading is equivalent to a branch of cold extrusion. Simply put, in the process of making bolts, hexagonal head forming is cold heading, and rod diameter reduction is cold extrusion (positive extrusion). Non-cut hexagonal flange bolts (multi-station forming) have both cold heading and cold extrusion. The front shaping of hexagonal nuts is only cold heading, and the hole extrusion in the back process is cold extrusion (positive and negative extrusion).