Automotive fasteners of small screw material and production process

Automotive fasteners of small screw material and production process

The application determines the selection of materials: such as steel tire bolts can be in the car flying forward and bumpy road driving to provide stable high-strength performance; in the transmission, the water pump in the bolts needs to be immersed in high temperature for a long time, acidic environment, that is, to reduce the weight, but also need a great deal of strength, austenitic stainless steel, aluminum alloys, copper alloy materials is the preferred choice.

Due to composition instability, insufficient endurance, and other characteristics, the bolt's single-metal composition has long been replaced by alloy materials. In automotive fasteners, carbon, manganese, nickel, chromium, molybdenum, and other metals are added to the bolt according to specific requirements.

Especially in the high temperature, vibration, and high-pressure environment inside the engine, fastening bolts are commonly added to improve the hardenability of the metal chromium, molybdenum, boron, alum silicon, and other elements to improve wear resistance, corrosion resistance, tensile strength at high temperatures have a significant role, and is conducive to maintaining strength at high temperatures, to ensure the stability of the effect of heat treatment and reduce the role of hydrogen embrittlement.

Cold and ruthless processing links: alloy bolt wool, in the processing mold cavity unit extrusion pressure, can be as high as 2000 ~ 2500MPa, but also subjected to highly high frictional resistance and temperature changes, so this is also in the initial test of the bolt's high strength and high hardness, but also should have a reasonably high toughness, will not be due to the impact, eccentric load, fatigue stress concentration caused by the fracture and cracking damage.

To make metal fasteners with the required mechanical properties, physical properties, and chemical properties, the overall heat treatment, surface heat treatment, and chemical heat treatment of the three main types of heat treatment to be changed to its mechanical, physical, and chemical properties, without changing the shape of the workpiece and the overall chemical composition, by changing the internal microstructure of the workpiece, or change the surface of the chemical composition of the workpiece to give or improve the use of the workpiece performance, improve Improvement of the intrinsic quality of the workpiece. Only on the same metal using different heat treatment processes can obtain different organizations, thus having different properties, such as after chemical heat treatment of steel parts, in essence, can be considered a unique composite material: the heart of the original composition of the steel, the surface layer is infiltrated with alloying elements of the material. Between the heart and the surface layer is a close crystal-type bonding, which is much stronger than the bonding between the heart and the surface obtained by surface reconditioning techniques such as electroplating.

Steel 12-Point Screws: Good for high-strength fastening, these screws are made from steel comparable in strength to Grade 9 steel. They are used for heavy-duty stamping applications and earth-moving machinery, such as bulldozers and excavators. The head makes 12 points of contact with a wrench to handle more torque than a socket head or hex head screw. The flange distributes pressure where the screw meets the surface, eliminating the need for a separate washer. To install, use a 12-point wrench that matches the head width of your screw.

Coarse Thread—Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch.

Fine Thread—Fine threads are closely spaced to prevent loosening from vibration.

IFI-115—Screws that meet IFI 115 comply with these specifications for dimensions.

Black Oxide—Black-oxide-coated screws are mildly corrosion-resistant in dry environments.

Length—Length is measured from under the flange.

Thread Spacing—Match the thread spacing of mating components.

Head Height—Head height includes the flange.

High-Strength Grade 8 Steel Thread-Locking Hex Head Screws: Made from Grade 8 steel, these screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are more than twice as strong as our stainless steel thread-locking screws. A nylon patch bonded to the threads adds friction to resist loosening from vibration. These screws have a zinc yellow-chromate plating that provides corrosion resistance in wet environments. The material meets SAE J429 specifications for quality. Dimensions meet ASME B18.2.1 specifications. Grade 8 steel hex head screws are marked with six radial lines. Length is measured from under the head.

Smooth and beautiful beauty project: just manufactured automotive fasteners wool, the external very uneven, and there is no coating protection, not durable and corrosion-resistant, so it is necessary to use the surface of its surface modification technology, thin film technology, and coating technology so that the surface of the material to obtain the material itself does not have and want to have the performance of the project, the surface of the material and the substrate together as a system for the design.

Through the carburization, chemical plating, electroplating, anodizing, painting, baking, and vapor deposition processes such as surface treatment can also be given to the surface of these fasteners has no original unique properties, including electromagnetic properties, thermal properties, acoustic properties, and radiation protection, chemical properties, mechanical properties, tribological properties, decorative.

Step up to the job of fastening: Thanks to the emergence of the TROX+ hexagonal shape,

which is now widely used in the automotive sector due to characteristics such as allowing higher torque

Even the best bolts need to be tightened correctly to be effective, but 90% of the great force used to reach our specified torque number is not used for clamping; about 50% of the force is used to counteract the friction under the head of the bolt during the tightening process, and 40% is used to counteract the friction generated by the nut. That is to say, we need the clamping force to be only a poor 10%.

But at this point, we must not be greedy for more. In the critical parts of the fastener head, there will be corresponding requirements of the tensile strength value. If you hurry, the process must be strictly quasi-compliant implementation. In the analyzing instrument, it can be seen that due to the torque being too large, caused by the bolt lengthening, the bolt will appear inside the irregular yielding and fracture traces; instead of reducing the clamping force, it also increases the possibility of bolt fracture.

Metric Painted Steel Pan Head Torx Screws: Add a decorative look when fastening parts—these metric screws have a painted head. Their painted finish is more precise, consistent, and durable than painting the screw yourself—it won't chip or fade. The paint also acts as a barrier, protecting the screw from chemicals and water. To reduce the chance that you'll damage the paint, these screws have a Torx drive. Since this drive has more points of contact than other drive styles, it's harder for the driver to slip while you fasten the screws; if the paint is damaged, these screws are zinc-plated; they'll still resist corrosion in wet environments. All meet ISO 14583, an international standard for Torx socket screws.

Sealing Tamper-Resistant Torx Flat Head Screws: Prevent unwanted removal, leaks, and contamination. These screws have a tamper-resistant Torx drive—also known as a pin-in Torx drive—that makes them challenging to unscrew without special tools. An O-ring under the head blocks leaks and seals out dust and dirt. With a flat head and an undercut profile, these screws are suitable for use in thin matThey. They're angled under the head to sit flush with countersunk holes. Made of 18-8 stainless steel, these screws have good corrosion resistance and may be mildly magnetic. All are passivated for added protection against corrosion. Their O-ring is made of Buna-N rubber, which withstands wet and abrasive environments. Length is measured from under the head.

Tamper-Resistant Rounded Head Drilling Screws for Metal: A tamper-resistant Torx driver is required for installation and removal. Also known as pin-in-Torx, these screws allow you to apply extra force with less slippage or damage to the recess. They save you time and effort by drilling their holes and fastening in a single operation. Made from 410 stainless steel they're strong, wear-resistant, and mildly chemical-resistant. Not for use with aluminum. Length is measured from under the head.For high-quality Tamper-Resistant Flat Head Drilling Screws for Metal Screws and professional technical support, don't hesitate to contact us at adelajonly@gmail.com or visit our website at https://www.juxinfasteners.com.