The usual fastening method of vehicle fasteners

The usual fastening methods of the whole vehicle fasteners are bolts, screws, double-headed studs, and nuts or threaded holes with self-tapping screws and prefabricated holes, snap pipe clamps embedded with; clamps ring clamps locking with. Fastener surface treatment and grade matching the selection of

1. The principle of fastener color selection is to match the clamped parts; in non-appearance parts conditions, priority is given to silver white.

2. Fasteners, according to the use of different parts of the car, can be used in various grades of rust prevention grade.

3. The mechanical properties grade is higher than 8.8, so using galvanized passivation for surface treatment is not recommended. Non-electrolytic zinc sheet coating is generally recommended.

4. For all fastening parts with hardness higher than 350 HV, such as spring washers, galvanized passivation is not recommended for surface treatment to prevent possible hydrogen embrittlement failure.

5. In general, nuts and bolts, studs, or screws' mechanical performance grade match as follows: 1, 8-grade nuts can be matched with 8.8-grade bolts, studs, or screws. 2, 10-grade nuts can be matched with 10.9-grade bolts, studs, or screws. 3, 12-grade nuts can be matched with 12.9-grade bolts, studs, or screws. Generally speaking, the higher-performance grade nut can replace the lower-performance grade nut, such as the grade 10 nut can replace the grade 8 nut with the 8.8 grade bolt, stud, or screw.

Factors to consider when selecting fasteners

Select the applicable fasteners; the selection should consider the fastening performance and whether it is easy to assemble, whether to return after-sales service, whether to meet the aesthetic requirements, whether the cost is as low as possible, etc. Things to consider when designing and selecting fasteners! Each bolt's strength and coefficient of friction are clearly defined, and the preload it can provide varies according to the torque strategies. Still, the minimum preload for a given torque strategy can be determined. After obtaining the minimum preload force required at the connection point, compare which specification of the bolt can provide a minimum preload force more significant than it; you can choose the most economical specification and performance level among them; the following are the general selection steps.

One 、Determine the connection mode: bear the tensile load, take the shear or composite load?
2, according to the connection mode, determine the connection sub's working load.
3, calculate the axial load and tangential load on the bolt.
4, to determine the minimum clamping force.
5, calibrate the face pressure of the clamped parts to prevent crushing.
6, to determine the appropriate specifications and performance level.

The new energy vehicle industry provides innovative fastening solutions

As the demand for new energy vehicles (NEVs) continues to rise, the need for reliable and durable fastening solutions becomes increasingly critical. At Jux Fasteners, we specialize in providing high-strength screws, nuts, and rivet nuts that meet the stringent standards of NEV sealing and performance.

Rivet nuts feature a unique locking mechanism, ensuring tight and secure connections even in harsh environments.

Zinc-nickel alloy plating provides excellent corrosion protection and electrical conductivity, making it an ideal coating for NEV components.

Our products have been extensively tested and verified to meet the latest NEV standards and regulations, ensuring they can deliver the performance and reliability our customers demand. Our commitment to quality and innovation has made us a trusted partner for leading NEV manufacturers and suppliers worldwide.

As a PACK structure designer or a structural design researcher, you can rely on Juxin Fasteners to provide the latest and most effective fastening solutions for your NEV projects. Whether you need standard products or custom-made fasteners, we can work with you to find the best solution that fits your requirements.

Contact us today to learn more about our innovative fastening solutions and how we can help you achieve your NEV design goals. If you are looking for high-quality fastener screws&all all kinds of nuts or technical support for structural design, welcome to contact me.Thanks.Email:sales@jxfastener.cn,

Application of high-strength bolts and heat-resistant bolts in the new energy vehicle industry

Ultra-high-strength fasteners can reduce their weight and, more importantly, provide more significant potential and safety protection for the lightweight design of other vital components.
New energy vehicles usually use 10B33, SCr440 (40Cr), SCM435 (35CrMo), and SCM440 (42CrMo) steel to produce 8.8, 9.8, 10.9 high-strength bolts, and the highest strength level of ultra-high-strength bolts is 1400Mpa (14.9).

Under the trend of lightweight automobiles, the powertrain system has continuously increased requirements for power density and strict emission requirements. High power density brings higher pressures, higher temperatures, and increased loads, while stringent emissions standards call for reduced weight and internal friction. The new energy vehicle has a weight requirement, and weight reduction is significant for battery mileage. Using ultra-high-strength bolts can reduce the weight of the bolt itself, and smaller bolt holes can be used accordingly so that the weight of the connected parts will also be significantly reduced. Using ultra-high-strength bolts can reduce the weight of new energy vehicles. The significance potential is still huge.

Ultra-high-strength bolts are mainly used on new energy vehicle engines, gearboxes, and axles. In the critical areas of the engine, a. connecting rod; b. cylinder head connection; c. primary bearing connection; d. flywheel and other parts.

Ultra-high-strength bolts are applied to the chassis of new energy vehicles, bearing connection bolts, the number of bolts can be reduced from 4 to 3, and the specification is reduced from M12 to M10.

For battery packs and motors, especially for battery packs, the module bolt connection can be reduced from M8 to M6, and the battery pack body connection M10 can be decreased to M8.

Contact us today to learn more about our innovative fastening solutions and how we can help you achieve your NEV design goals. Suppose you are looking for high-quality fastener screws&all all kinds of nuts or technical support for structural design; welcome to contact us. Thanks. Email: sales@jxfastener.cn,

Application in connection design of new energy vehicle bolts/nuts  

In the connection design of new energy vehicle bolts/studs, the designer must not only fully consider the size, material, tolerance level, mechanical properties, etc., of the bolts but also fully consider the application environment of the bolts, such as temperature field (high/low temperature), vibration, etc., alternating hot and cold, corrosive and other environmental factors.

Non-quenched and tempered steel has outstanding advantages, such as excellent performance, high efficiency, energy savings, and low use cost. It is conducive to environmental protection and energy savings. The non-quenched and tempered steel used to manufacture fasteners is cold-work strengthened. According to the organization, there are ferrite+ Pearlite, ferrite + bainite, and ferrite + martensite duplex structures.
The national standard has three grades: MFT8, MFT9, and MFT10. SCN430 and SCN435 energy-saving non-quenched and tempered cold heading steels do not require heat treatment and have been used in products with a strength level of 8.8.

The 8.8-grade M6×840, M8X675, and M6×930 long studs for fixing new energy vehicle battery packs are made of non-quenched and tempered steel MLF20MnVNb without quenching and temper. The length of the studs made of wire rods after drawing, cold heading, and rolling is 830-920 mm, the performance of the studs meets the requirements of grade 8.8, and the fatigue limit σ-1 of 5 million times is 86-101 (average 86.40) MPa, which meets the requirements of the automobile factory (≥80 MPa). Factory certification. It can meet the requirement of less than 0.5mm/m straightness requirement, and the application of non-quenched and tempered steel in high-strength fasteners still has the problem of die wear. Due to the unique environment of the engine exhaust system and the sealing problem between the connecting parts, design has always been complicated for various automobile manufacturers' research and development processes. For the localization requirements of automotive heat-resistant steel fasteners, T/CSAE99-2019 "Technical Conditions for Heat-resistant Steel for Automotive Fasteners" and T/CSAE136-2020 "Technical Conditions for Automotive High-temperature Connection Fasteners" and GB/T3098 .24-2020 "Stainless Steel and Nickel Alloy Bolts, Screws, Studs and Nuts for High-Temperature Mechanical Properties of Fasteners" and GB/T3098.25-2020 "Guidelines for the Selection of Stainless Steel and Nickel Alloy Fasteners with Mechanical Properties of Fasteners." The main content includes relevant technical requirements for heat-resistant materials for fasteners, technical requirements for wire rods and wires, technical conditions for manufacturing high-temperature-resistant fasteners and technical conditions for surface treatment, and technical conditions for system assembly verification, including mechanical properties and torque tests. Identification marks, packaging, delivery requirements, etc., apply to engine fasteners, including hexagonal bolts, studs, nuts, etc.

Heat-resistant steel or nickel alloy fasteners, material grades are ML06Cr15Ni25Ti2MoAlVB (GH2132), ML04Cr11Nb, ML41CrMoV, ML21CrMoV, 14Cr17Ni2 (1Cr17Ni2), NiCr20TiAl (GH4080A), Inconel718 (GH4169), etc. For heat-resistant fasteners, although there are many heat-resistant materials containing nickel and chromium, correct heat treatment technology must be used to better play the function of heat-resistant steel. For this reason, the heat treatment process is an important guarantee for improving the quality and reliability of heat-resistant steel fasteners. High-strength fasteners can provide higher clamping force, reduce the size of fasteners, and reduce their weight to meet lightweight requirements. At the same time, high-strength fasteners are also conducive to the compactness of other structures of new energy vehicles, thereby improving heat dissipation and internal friction;

Heat-resistant fasteners are used to solve the problem of connection failure in high-temperature environments. The increase in the temperature of the engine exhaust environment causes changes in the product's mechanical properties, such as a decrease in tensile strength and hardness. This results in creep or alterations in the metallographic structure, leading to connection failure.

The development of future fasteners for new energy vehicles lies in the continuous integration and progress of technologies such as artificial intelligence, machine learning, big data, and the Internet of Things.

These technologies can control quality and improve failure prevention measures from fastener design, forming, heat treatment, surface treatment, assembly, installation, etc., and reduce risks and failure rates, improving fasteners' manufacturing and application levels. Even the reliability of automobiles is of great significance.