Oct 14,2022

What are the standards of screw bolts?

The most commonly used standards of screw bolts in ordinary business are the following: GB---Chinese National Standard ANSI---American National Standard DIN---German National Standard ASME---American Society of Mechanical Engineers Standard JIS---Japanese National Standard BSW---British National Standard There are the differences in the basic dimensions of the above several standards, such as the opposite sides of the head, the thickness of the head and the threaded part. The threads of GB, DIN, and JIS are all based on millimeters as metric threads. Threads such as ANSI and ASME are American standard threads in inches. There is also a BSW-imperial standard which threads are also measured in inches, commonly known as Wyeth threads.

Oct 14,2022

How to choose a right screw bolt?

What are the types of screw bolts? Wood screw bolts are usually made of steel. Brass, nickel, bronze, or copper screw bolts should be used if there is potential for corrosion. For optimum performance, you need to drill it first. Use sheet metal screw bolts to fasten pieces of metal together. Sheet metal screw bolts form threads in the metal as they are installed. There are several different types. Pointed panhead screw bolts are coarse-threaded that are used in light sheet metal. Blunt panhead screw bolts are used for heavier sheet metal that are available in gauges from 4 to 14 and lengths from 1/4 inch to 2 inches. Partial roundhead screw bolts have finer threads in soft or hard metals. Self-tapping roundhead screw bolts are used for heavy-duty work with thick sheet metal, which are available in diameters from 1/4 inch to 2 inches and in lengths from 1/8 to 3/4 inch. Machine screw bolts are blunt-ended screws used to fasten metal parts together. They are also made with coatings, such as brass, copper, nickel, zinc, cadmium, and galvanized to deter rust. Machine screw bolts have four basic types of heads, that are, flathead, oval-head, roundhead, and fillister-head. Lag screw bolts are heavy-duty fasteners, driven with a wrench and used for fastening. The anchors are inserted into holes drilled in the masonry. Then the lag screw bolts are driven firmly into the anchors.

Oct 14,2022

Where can screw bolts be used?

Screw bolts are indispensable industrial necessities in daily life from glasses and electronics to construction and transportation equipment. Screw bolts play an important role in industry. Screw bolts are mostly used for steel structure projects with relatively large bearing capacity, such as civil building steel structure, bridge steel structure, and power station steel structure. Screw bolts are fasteners for all sorts of construction projects. There are so many different types of screw bolts because different objects and materials need to be fastened. Screw bolts are classified by the material they are used to fasten. You need concrete ones for fastening objects to concrete, wood screw bolts for fastening objects to wood, or drywall ones for fastening objects to drywall. No one screw bolt could serve as a one-size-fits-all solution. Jiangsu Suqing Standard Parts Co., Ltd. has more than 200 employees and more than 20 senior technical personnel. We have 40 advanced fully automatic multi-model cold heading machines, specializing in the production of national standard GB, German standard DIN, American standard ANSI series and special long-size hex bolts.

Oct 14,2022

What are the features of screw bolts?

What are the features of screw bolts? The purity and quality of the materials are directly related to the quality of the screw bolts. Those made of good materials are not easy to twist off and have a better fastening effect. Common materials for making screw bolts include carbon steel, stainless steel, copper and copper alloy. The raw materials of grade 8.8 and above are low-carbon alloy steel or medium-carbon steel, which are formed by heat treatment. Cold heading forming process requires high demands, which requires more sophisticated production equipment. The imported production equipment increases the cost and difficulty of screw bolts. High-strength and high-precision screw bolts are often heat-treated to make them have better functions. Some screw bolts are sometimes used in special environments, such as high-speed rail tracks. This highly vibrating environment requires them to be tightly hugged together to prevent loosening. The screw bolts will form a fine oxide layer on the surface of the bolts during the appearance treatment to prevent them from being corroded and shorting the service life.

Oct 14,2022

How to clean screw bolts?

What are the failures of screw bolts? The blackening of screw bolts is generally due to the high heat generated during cold heading or tooth rubbing. It occurs in the cross-groove part. During the production process, the supply of lubricating oil can end the heat relaxation in time. The speed of the machine can also be appropriately lowered to prevent the occurrence of problems. In addition to technical reasons, the blackening of screw bolts may also be caused by the material. As the constant use of the machines, the screw bolts can be easily loose. In order to prevent spontaneous loosening, it is necessary to eliminate the sliding between the connected parts. The attachment of dust or heterogeneous metal particles and the condensed water of the screw bolt form a micro battery, triggering an electrochemical reaction. The protective film is damaged. The surface of screw bolts adheres to the organic juice, which forms organic acid that will corrode the metal surface. Sometimes, screw bolts are often seen cracking. The quality of the materials selected for the screw bolts is problematic. There are process problems in producing screw bolts. In addition, there is too much force used on screw bolts.

Oct 14,2022

How to distinguish the quality of screw bolts?

What are the differences between bolts and screws? There is an assumption that screw bolts are screws that they are the same fastening hardware. While they look similar and even have similar characteristics, they are two unique fasteners with their own unique applications. Screw bolts are used to assemble to unthreaded objects with nuts. Screws assemble objects with threads. Some objects have pre-made threads, whereas others create the thread during the installation. The screw bolt is to assemble threaded objects, while the screw is to assemble untreaded objects. Screws must be turned to assemble a joint, while screw bolts can be secured in place using a tool. Screw bolts are typically used to make a bolted joint by using a nut to apply force while using the shank to act as a dowel. This pins the joint against sideways forces. Therefore, many screw bolts have an unthreaded shank, making them more effective for dowels. How to distinguish the quality of screw bolts? First of all, screw bolts have to look at the material before they are made. Quality compliance is the prerequisite for reaching the national standard. Without looking at the material, the heavier one is the better Then look at the tolerance value between the screw bolts and the national standard. The standard is used to determine whether it is good or not. The smaller the tolerance value of screw bolts and national standards, the better screw bolts are. After screwing the nut into the screw bolt, hold the nut and shake it left and right to feel the gap between the nut and the screw bolt. The one that has the larger gap is inferior. This way can check the rib accuracy of the screw bolt.

Oct 14,2022

What are the benefits of screw bolts?

What are the benefits of screw bolts? Screw bolts can reduce the weight of the component. Screw bolts have a high-strength ability. Screw bolts only occupy a minimum space within the tool. The installation and maintenance of screw bolts are easy and simple. Screw bolts are capable of connect a wide range of sheet metal thickness. All surface-coated sheet metal panels are available. Screw bolts save time when you are working on a significant project, which is incredibly important in large construction projects. Screw bolts are reliable, as they hold materials together firmly and have a long service life. Installing them with a coating can also prevent discoloration of the material due to rust or corrosion, making screw bolts ideal for harsh environments.

Oct 14,2022

How to loosen a stuck screw bolt?

How to buy a right screw bolt? To ensure a proper and safe fit, you will need to identify specific characteristics of screw bolts. Thread size: You can easily identify your thread size of screw bolts and pitch with a simple thread pitch gauge available at any hardware store. The thread size of screw bolt is the measurement taken across the outside diameter of threads measured in standard or metric dimensions. Thread pitch: The thread pitch of screw bolts is the measurement of either threads per inch for non-metric studs or the distance in millimeters between the threads for metric applications. Length or dimensions: It is critical that you confirm the dimensions of screw bolts to ensure a proper fit for both safety and appearance, including the outside diameter, overall length. You must also determine the proper shank diameter and shank depth of screw bolts. Finish or color: Our screw bolts are available in a wide variety of finishes and colors including chrome plated, black chrome, stainless steel, zinc, yellow chromate, silver, red, and blue. How to loosen a stuck screw bolt? Make sure you have got the right size and shape of screwdriver. Smaller screwdrivers, square heads or Phillips heads, will fit into a larger screw bolt. But they cannot provide the full amount of torque and would destroy the slot or round off the head. Be sure that turn the screw bolt in the proper direction. If you work upside down, it is easy to get twisted around and be tightening rather than loosening. Put some penetrating oil on the screw bolt and place it for a while. Insert your screwdriver and tap with your hammer. Break the screw bolt free from the rust in place. Apply some heat directly to the screw bolt using an electric soldering gun or a propane plumbing torch. Wipe up any excess. If you attempt to remove the screw bolts that have the ruined head, a small metal file flats two sides. Lock on your locking pliers and try to remove it by turning the pliers. Use a small hacksaw to cut a slot in the screw bolt. Then, use a large slot screwdriver to remove. Use a commercial screw remover that is small sharp metal drill bits with reverse threads. Insert the bit in electric drill. Set the drill to reverse, then slowly drill into the screw bolt.

Oct 14,2022

How to remove rust from screw bolts?

How to deal with the covering layer of screw bolts? The structure of the covering layer of screw bolts should be tight and small in pores. The layer of screw bolts is evenly distributed and has a certain thickness. The covering layer of screw bolts is separated from the base metal and has good adhesion. Screw bolts should be treated with corrosion resistance, wear resistance with high hardness. Screw bolts have strong corrosion resistance, high temperature resistance, and good rust resistance. However, they will also be rust if they are often exposed to harsh environments. How to do moisture-proof measures for screw bolts? If the screw bolts get wet, it is very likely to rust. Therefore, in order to prevent the screw bolts from rusting, we have to protect them from moisture. Use solvent-free paint as far as possible for screw bolts used on the vibration machinery. It is best to use impregnating varnishes that do not contain oxidizing components. When using melamine dipping paint, the curing temperature and time should be adjusted. The temperature should be slightly higher than 130°C and the time should be greater than 180 minutes. The process must be strictly implemented, especially in the hot and humid season. Use paint without volatile acid for screw bolts. Or, choose a paint with good hydrolysis resistance.

Oct 14,2022

Why does screw bolt break?

Why does screw bolts break? Generally, screw bolts are not easy to break during use unless under special circumstances. If the quality of the raw materials used in the screw bolts is not good and has a lot of magazines, it will result in insufficient hardness. Excessive force applies to the screw bolts during use. Do a torque test first to check the minimum breaking force, and then adjust the torque. If high torque is required, screw bolts can be done with heat treatment. There are process problems in the production of screw bolts, such as eccentric heads. Check whether the pre-hole is suitable or not. If it is too small, the screw bolt will easily break when it enters. How to remove screw bolts? If screw bolts are easily removed, they wouldn’t be very secure. So, removal takes some effort. There are a variety of screw bolts that each with different attributes and designs. The design allows them to be tightened with a regular screwdriver without loosening. Use a special screw bolt removal tool. It will work with stainless steel screw bolts. You must use the correct sized tool that matches the size of the screw bolts. The tools feature two, super-hard tungsten carbide tips which can effectively dig into the screw bolt. By applying pressure via the removal tool, it’s possible to loosen the screw bolt. Modify the screw bolt to create a screwdriver slot. It is possible to turn your screw bolt into a usable flathead one by carefully sawing a slot. This can be achieved using a small hacksaw or high-seed rotary tool. Then, use a screwdriver to remove. Dig the teeth of the pliers into the screw bolt. This can provide enough pressure to loosen the screw bolt. Another option is to file two flat sides of the screw bolt, making it easier to achieve a firm grasp.