Hex Bolt Wholesaler introduces the role of nut gaskets
1. In the screw with nut, the function of the gasket is to increase the contact area, reduce the pressure, and protect the parts and... moreHex Bolt Wholesaler introduces the role of nut gaskets
1. In the screw with nut, the function of the gasket is to increase the contact area, reduce the pressure, and protect the parts and screws.
2. Gasket refers to a material made of paper, rubber sheet, or copper sheet and placed between two planes to strengthen the seal. The sealing element is set between the static sealing surfaces in order to prevent fluid leakage.
3. Gasket is a mechanical seal between two objects. It is usually used to prevent pressure, corrosion, and natural expansion and contraction of pipelines from leakage between two objects. Since the machined surface cannot be perfect, the irregularities can be filled with gaskets. Gaskets are usually made of sheet materials, such as paper backing, rubber, silicone rubber, metal, cork, felt, neoprene, nitrile rubber, glass fiber, or plastic polymers (such as polytetrafluoroethylene). Gaskets for certain applications may contain asbestos.
4. Generally, the screw with the nut is fixed in the through-hole, and the diameter of the through-hole is generally slightly larger than that of the screw. Therefore, a gasket is needed to increase the contact area. Protect the parts. Tighten the parts, reduce the pressure, and protect the parts and screws.
2h Heavy Hex Nuts Manufacturer introduces the classification characteristics of different fasteners:
1. Bolts. The bolts we often talk about refer to a product with external threads, and in most... more2h Heavy Hex Nuts Manufacturer introduces the classification characteristics of different fasteners:
1. Bolts. The bolts we often talk about refer to a product with external threads, and in most cases, bolts refer to external hexagonal bolts. Of course there are square-head bolts, but they are not commonly used. Bolt external thread products cannot be self-locked during installation, and must be matched with an internal thread. In some cases, an internal thread is tapped on the base to allow the bolt to be screwed in. Have After passing through a hole, some are fitted with a nut on the other side.
2. Studs. Most of our commonly used stud standards refer to a type of externally threaded fastener without a head. For example, double-ended studs are typical of stud products. The stud also needs to be used in conjunction with the nut. Both ends of the thread have threads. The polished rod part in the middle can be used as a shaft. The two ends are tightened with a nut and can be disassembled at any time.
3. Screws. In our country, many of the fasteners called screws refer to small machine screws, such as cross pan head screws, cross countersunk head screws, and self-tapping screws. The only product that is a large screw is the hexagon socket head screw. The hexagon socket head screw also needs to be used in conjunction with an internal thread during the installation process. The self-tapping screw does not need an internal screwWith pattern matching, it can directly tap into the base and use its own thread characteristics to lock.
4. Nuts. All products called nuts, no matter what shape they are, belong to the internal thread series. Nuts are square, round, thick and thin, and the standards vary. But no matter what standard nut is, it must be used in conjunction with the external thread, otherwise the internal thread of the nut has no meaning.
5. Self-drilling self-tapping screws. This refers to the series of self-tapping screws. The wood screws used in the decoration also belong to this self-tapping screw category, and the large hexagonal wood screws used in the installation of wood packaging are also self-tapping screws.
6. Washers. There are more standards for washers. They are round and square, with teeth or without teeth. There are many standards, but no matter what standard it is, it is used with bolts and nuts. Most washers are just a spacer isolation The role of. Only spring washers and anti-loosening washers have a little additional locking effect.
7. Circlip pin shafts. There are generally two types of gear rings, hole gears and shaft gears. It is stuck in a slot and plays a role of positioning or not coming out. Basically, they are used in conjunction with the pin shaft. That is to say, companies that can use retaining rings basically use these products.
8. Rivets, welding nails, and rivets are special fasteners, and many purchasers can't figure out what the standard is. There are also many kinds of rivets, including headless rivets, hollow rivets, blind rivets and so on. Rivets are sheet metal fasteners. Many cases and cabinets are produced using rivets. The same is true for welding nails, which cannot form external or internal threads in some thin sheet metal In this case, welding can be used to solve the problem.
9. Combined fasteners. Combination type fasteners are divided into two categories, one type is pan head or countersunk head combination screws, this type is some small screw products, and electronic equipment is used more. There is also a kind of steel structure bolts for large steel structures, which also belong to the combined type of fasteners, because the purchase of steel structure bolts is basically a set of purchases.
Through the above introduction, Heavy Hex Bolt Factory hopes that you can simply refer to the content of this article in future use.
Hexagon bolts are widely used and have very good fastening effects, but they will inevitably become loose during use. Next, 2H Heavy Hex Nuts Suppliers introduces how to reduce the looseness of... moreHexagon bolts are widely used and have very good fastening effects, but they will inevitably become loose during use. Next, 2H Heavy Hex Nuts Suppliers introduces how to reduce the looseness of hexagon bolts.
There are many reasons for the loosening of hexagonal bolts, such as insufficient tightening, vibration, and fatigue.
1. Insufficient tightening. When tightening hexagon bolts, if the pre-tightening force is insufficient, it will cause insufficient tightening or false tightening. Therefore, after a period of use, the joint part of the bolt becomes loose due to insufficient pre-tightening force.
2. Vibration. When the hexagonal bolts are in a vibrating environment, there will be many small lateral movements, causing the bolt connection parts to move repeatedly with each other. These movements will eliminate the friction between the bolt and the connection, causing the bolt thread to loosen. In addition, fatigue is also a common cause of loosening of hexagon bolts, because the pre-tightening force is greatly reduced, resulting in partial deformation or permanent damage of the bolt thread. How to reduce the loosening of hexagon bolts? In order to avoid spontaneous loosening of bolts, we need to eliminate or reduce the sliding between the connectors, which can be improved by increasing the axial tension, increasing the friction of the clamping parts, and reducing vibration and impact. We can also reduce the problem of looseness by increasing the thread friction of the hexagonal bolts, but it will be more difficult to remove the bolts in the future.
Through the above introduction, Heavy Hex Bolt Factory hopes that you can simply refer to the content of this article in future use.
2H Heavy Hex Nuts Factory introduces the difference between high-strength bolts and general bolts:
1. General bolts are divided into three types: A, B, and C. The first two are refined bolts, which... more2H Heavy Hex Nuts Factory introduces the difference between high-strength bolts and general bolts:
1. General bolts are divided into three types: A, B, and C. The first two are refined bolts, which are rarely used. Generally speaking, general bolts refer to C-grade general bolts.
2. In some temporary connections and connections that need to be disassembled, C-level general bolts are commonly used. Common bolts commonly used in building structures are M16, M20, and M24. The diameter of crude bolts in some machinery industries may be relatively large and have special uses.
3. The materials of high-strength bolts are different from those of ordinary bolts. High-strength bolts are generally used for permanent connections. Commonly used are M16~M30. The function of oversized high-strength bolts is unstable and should be used with caution.
4. The bolt connection of the main components of the building structure generally adopts high-strength bolt connection.
5. The factory-made high-strength bolts are not classified into pressure-bearing type or conflicting type.
6. General bolts can be reused, but high-strength bolts cannot be reused.
7. High-strength bolts are generally made of high-strength steel (45 steel (8.8s), 20MmTiB (10.9S)). They are pre-stressed bolts. For the conflicting type, use a torque wrench to apply regular prestress, and the pressure-bearing type to unscrew the plum head. General Bolts are generally made of general steel (Q235) and only need to be tightened.
8. General bolts are generally 4.4, 4.8, 5.6 and 8.8. High-strength bolts are generally 8.8 and 10.9, of which 10.9 is the majority.
9. The screw holes of general bolts are not necessarily larger than high-strength bolts. In fact, bolt holes are generally relatively small.
10. Generally, the screw holes of grade A and B of bolts are generally only 0.3~0.5mm larger than bolts. C-level screw holes are generally 1.0~1.5mm larger than bolts.
Through the above introduction, Heavy Hex Bolt Manufacturers hopes that you can simply refer to the content of this article in future use.
Due to the design and use of stud bolts, the choice of bolt material is more inclined to steel bolts, and there are special requirements for material processing performance in the thread production... moreDue to the design and use of stud bolts, the choice of bolt material is more inclined to steel bolts, and there are special requirements for material processing performance in the thread production process. Manufacturers should carefully consider the weight, price, purchase, etc. when making bolts, and insert the screws in terms of the mechanical properties of the screws (especially the strength of the material), and require the conditions of the screws and the corrosion
resistance of the material. As a special requirement of the working temperature for the heat resistance of materials, steel has the advantages of beautiful appearance, cleanness, environmental protection, low cost, good safety performance, and good impact resistance.
2H Heavy Hex Nuts Manufacturers introduces that in the production process of stud bolt manufacturers, considering that stud bolts are mainly used for situations that require frequent removal of connections, this is also required for the installation, use, and processing of much mechanical equipment. Bolts have a high bearing capacity, but they will corrode in long-term use. Therefore, how to properly maintain stud bolts during use to strengthen the maintenance and use of bolts, choose suitable storage locations and warehouses, maintain ventilation, and pay attention to weather changes. Avoid rain or impurities, it is recommended to use the product as soon as possible.
Through the above introduction,Heavy Hex Bolt Factory hopes that you can simply refer to the content of this article in future use.
2H Heavy Hex Nuts Factory introduces the use range of hexagon nuts:
1. On the machine, the position of the nut is not sufficient, and the wrench space for screwing the nut is also very narrow. For... more2H Heavy Hex Nuts Factory introduces the use range of hexagon nuts:
1. On the machine, the position of the nut is not sufficient, and the wrench space for screwing the nut is also very narrow. For hexagonal nuts, you only need to pull the wrench 60 degrees at a time to tighten the nut slowly, while the quadrilateral nuts need to be pulled 90 degrees at a time.
2. To make the nut into a hexagonal shape is to make full use of the material. Because from the standpoint of strength, large nuts are stronger than small nuts. In the past, nuts were usually ground out of round materials. The same round rod with it.
3. Use hex nuts. Because it is easy to use and improves the utilization rate of materials, it is mostly used in the market. Although the hex nut is only a small fastener, it is not easy to use to buy or identify the brand manufacturer, and it is more secure in terms of quality.
Through the above introduction, Heavy Hex Bolt Factory hopes that you can simply refer to the content of this article in future use.
2H Heavy Hex Nuts Manufacturers introduces what are the precautions for using hexagonal weld nuts?
1. The power supply with vertical external characteristics is adopted, and the positive polarity is... more2H Heavy Hex Nuts Manufacturers introduces what are the precautions for using hexagonal weld nuts?
1. The power supply with vertical external characteristics is adopted, and the positive polarity is adopted for direct current (the welding wire is connected to the negative electrode).
2. Generally suitable for the welding of thin plates below 6mm, with the characteristics of beautiful welding seam shape and small welding deformation.
3. The protective gas is argon with a purity of 99.99%. When the welding current is 50-150A, the argon flow is 8-10L/min, when the current is 150-250A, the argon flow is 12-15L/min.
4. The protruding length of the tungsten electrode from the gas nozzle is preferably 4-5mm. It is 2-3mm in places with poor shielding properties such as fillet welding, and 5-6mm in places with deep grooves. The distance from the nozzle to the work is generally not More than 15mm.
5. In order to prevent the appearance of welding pores, the welding parts must be cleaned up if there is rust and oil stains.
6. For welding arc length, 2~4mm is better when welding ordinary steel, and 1~3mm is better when welding stainless steel. If it is too long, the protection effect will not be good.
7. In order to make the argon gas well protect the welding pool and facilitate the welding operation, the center line of the tungsten electrode and the welding workpiece should generally maintain an angle of 80-85°, and the angle between the filler wire and the surface of the workpiece should be as small as possible. It is generally about 10°.
8. Windproof and ventilation. In windy places, be sure to take measures to block the net, and take appropriate ventilation measures indoors.
Through the above introduction, Heavy Hex Bolt Factory hopes that you can simply refer to the content of this article in future use.
There are two types of screw surface inspection, one is the inspection after the screw is produced before it is electroplated, and the other is the inspection after the screw is electroplated, that... moreThere are two types of screw surface inspection, one is the inspection after the screw is produced before it is electroplated, and the other is the inspection after the screw is electroplated, that is to say, the inspection after the screw is hardened and the surface of the screw is processed. Next,2H Heavy Hex Nuts Manufacturers will introduce how to inspect screws:
1. Appearance quality requirements
The appearance of screws is inspected from the appearance, plating layer, and other aspects.
2. Inspection of the thickness of the screw coating
① Measuring tool method
The amount used includes micrometer, vernier caliper, plug gauge, and so on.
②Magnetic method
The magnetic method to measure the thickness of the coating layer is a non-destructive measurement of the non-magnetic coating layer on the magnetic substrate with a magnetic thickness gauge.
③Microscopy
The microscopy method is called the metallographic method, which is to magnify the etched fasteners on a metallographic microscope with a micrometer eyepiece to measure the thickness of the coating on the section.
④Time flow method
The chronograph flow method is to use a solution that can dissolve the coating on the partial surface of the coating, and calculate the thickness of the coating according to the time required for the partial coating to dissolve. There are also plating spot methods, anode dissolution coulometric methods, and so on.
3. Inspection of the adhesion strength of the screw coating
Friction polishing test; file method test; scratch method; bending test; thermal shock test; extrusion method.
4. Inspection of corrosion resistance of screw plating
The coating corrosion test methods include: atmospheric exposure test; neutral salt spray test (NSS test); acetic acid salt spray test (ASS test), copper accelerated acetic acid salt spray test (CASS test); and corrosion paste corrosion test (CORR test) and solution spot corrosion test; immersion test, inter-immersion corrosion test, etc.
Through the above introduction, Heavy Hex Bolt Factory hopes that you can simply refer to the content of this article in future use. less
2H Heavy Hex Nuts Manufacturers introduces the quenching process of hexagon bolts:
(1) Secondary punching. The secondary punch is made of 60Si2Mn steel, and its failure mode is usually head... more2H Heavy Hex Nuts Manufacturers introduces the quenching process of hexagon bolts:
(1) Secondary punching. The secondary punch is made of 60Si2Mn steel, and its failure mode is usually head upsetting and fracture. Punch breakage is due to the low precision of the machine tool, heavy materials, hard parts or surface cracks, etc., while the thickness of the punch is due to the low die hardness and compressive strength. Therefore, the second-order punch is required to have higher yield strength and toughness. The second-class punch is made of LD steel, and its service life is increased from 30,000 to 4,000 pieces of 60Si2Mn steel to 21 to 39,000 pieces. Using 600℃, 850℃ two salt bath preheating, heating coefficient is 40~45s/min; 1120℃×20~22s/min; 550℃×1.5h×2 times of tempering. The hardness is around 59~61HRC.
(2) Three-sequence punching. The original triple punch was made of high-speed steel, and the failure mode was mainly fracture. Only a few failed due to the thick punch, and the service life was very low. Using LD steel punches, the average service life can reach 80,000 pieces. Use 600℃, 850℃ two salt bath preheating, the heating coefficient is 40~45s/mm; 1100℃ heating, quenching oil; 540℃×1.5×2 times of tempering. The hardness is around 61~63HRC.
Through the above introduction, Heavy Hex Bolt Factory hopes that you can simply refer to the content of this article in future use.
There are generally two kinds of lock nuts. One is to use two identical nuts to be screwed on the same bolt, and a tightening torque is added between the two nuts to make the bolt connection reliable;... moreThere are generally two kinds of lock nuts. One is to use two identical nuts to be screwed on the same bolt, and a tightening torque is added between the two nuts to make the bolt connection reliable; the other is a special lock nut, It needs to be used together with a kind of anti-loose gasket. The special lock nut is not a hexagonal nut, but a middle round nut. There are 6 notches on the circumference of the nut. These six notches are not only the focus of the tightening tool, but also the locking of the lock washer bayonet. Place. The second anti-loose method is more reliable than the first, but the structure is relatively complicated.
2H Heavy Hex Nuts Manufacturers introduced that the working principle of lock nuts is self-locking by the friction between the nut and bolt. However, the reliability of this self-locking under dynamic load will be reduced. In some important occasions, we will take some anti-loosening measures to ensure the reliability of the nut locking. The use of a lock nut is one of the anti-loosening measures.
In some important occasions, we will take some anti-loosening measures to ensure the reliability of the nut locking. The use of lock nuts is one of the anti-loosening measures. The working principle of the nut is self-locking by the friction between the nut and the bolt. However, the reliability of this self-locking under dynamic load will be reduced.
Through the above introduction, Heavy Hex Bolt Factory hopes that you can simply refer to the content of this article in future use.
