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Stainless Steel Crank Shaft
Material:Shaft
Hot melt nut/STFM3x0.5 STFM4x0.7 Full range of plastic insert copper nuts Internal and external thread self-tapping nuts
Definition and basic principles
Hot melt nuts are nuts that are embedded in plastic parts by heat melting. It is generally installed using a hot melt process. During the installation process, the heated cylinder part of the nut is used to melt the surrounding plastic material, and then it is embedded in the plastic through a certain amount of pressure. When the plastic cools and solidifies, the nut is firmly fixed in the plastic part to form a reliable internal thread connection structure, which can be used in conjunction with matching bolts and other connectors.
2. Material
Nut part
Common materials include copper (such as brass). Copper hot-melt nuts have good thermal conductivity, which enables the heat to be transferred evenly during the hot-melting process, which is conducive to better fusion with plastics. Moreover, copper has relatively good strength and corrosion resistance, can withstand a certain tightening force, and is not easily damaged during long-term use.
Hot-melt nuts made of stainless steel are also relatively common. Stainless steel has excellent corrosion resistance and is suitable for use in environments that require high corrosion resistance, such as outdoor equipment or plastic products that come into contact with chemicals.
Surface treatment (optional)
In order to further improve the performance of hot melt nuts, some nuts are surface treated. For example, after nickel plating, the appearance of the hot melt nut is more beautiful. At the same time, the nickel layer can play a certain protective role to prevent the nut from rusting and improve its wear resistance.
3. Structural characteristics
column structure
Hot melt nuts usually have a relatively long cylindrical part. The main function of this cylinder is to contact the plastic during the hot melting process and transfer heat to the plastic to melt it. The length of the column is determined by the specific plastic part thickness and installation requirements. For example, in thicker plastic parts, it is necessary to use a hot melt nut with a longer cylinder to ensure that it can penetrate deep into the plastic to form a stable connection.
Threaded part
The internal thread is a key part of the hot melt nut, and its specifications and accuracy comply with the corresponding standards (such as metric thread standards). The quality of the thread directly affects the matching accuracy with the bolt and the reliability of the connection. The threaded surface of high-quality hot-melt nuts is smooth and the pitch is uniform, which can effectively avoid problems such as slippage during tightening of bolts.
4. Advantages
Good firmness
Once the hot-melt installation is complete, the hot-melt nut is integrated with the plastic part. When subjected to external forces such as tension, pressure and torque, it can well distribute the force to the surrounding plastic materials and provide a stable connection. Compared with traditional mechanically installed nuts (such as simply drilling holes in the plastic and installing the nuts), hot-melt nuts are less likely to loosen or fall off. For example, in the assembly of automobile interior plastic parts, the use of hot-melt nuts can ensure that the connection of the interior parts remains firm even if the vehicle vibrates during long-term driving.
Good sealing performance
Since the hot-melt nut is tightly combined with the plastic part, it can effectively prevent the leakage of liquid or gas in some application scenarios that require sealing. For example, in the connection between the lid of some plastic containers and the container body, if hot melt nuts are used to fix the connecting parts, the sealing performance of the container can be improved to a certain extent.
Beautiful appearance
After the hot-melt nut is installed, there is usually only a small installation hole left on the surface of the plastic part or almost no installation traces are visible. This is not suitable for some plastic products with high appearance requirements (such as electronic product casings, high-end toys, etc.) is very important. It does not affect the overall aesthetics of the product like an external nut does.
auto industry
Hot melt nuts are widely used in the assembly of automobile interior parts (such as instrument panels, seat adjustment devices, etc.) and exterior parts (such as bumpers, etc.). Because the car will be subject to various external forces such as vibration and impact during driving, hot-melt nuts can ensure the reliability and stability of the connection of these components.
Electronic and electrical industry
The casings of electronic products (such as mobile phone casings, computer cases, etc.) are usually plastic products. Hot melt nuts can be easily used to install internal circuit boards, heat sinks and other components, and can ensure the appearance quality of the product and the firmness of the connection.
Household products field
For products such as plastic furniture (such as plastic tables and chairs), plastic storage boxes, etc., the use of hot-melt nuts can achieve a firm connection between components and improve the quality and service life of the product.
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Material: Brass
Strength level: Class A -
Products Recommended
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Ningbo Yi Yi Precision Technology Co., Ltd.
Ningbo Yi Yi Precision Technology Co., Ltd. is leading China Hot melt nut/STFM3x0.5 STFM4x0.7 Full range of plastic insert copper nuts Internal and external thread self-tapping nuts suppliers and OEM/ODM Hot melt nut/STFM3x0.5 STFM4x0.7 Full range of plastic insert copper nuts Internal and external thread self-tapping nuts company, a combination of industry and trade enterprises, including Ningbo Xinhaocheng Precision Parts Co. With 1000 square meters of production plant and 30 employees. Its 2 companies focus on centering machine processing, production of precision non-standard parts, and has advanced imported equipment from Japan: STAR and Tsugami 5-9 axis centering machine, Citizen lathe, machining center and other equipment. The machine has the function of six-axis turning processing, which can complete drilling, turning, milling, tapping, boring, reaming, hobbing, shaping, etc. at one time, which can ensure the high precision, consistency and stable tolerance of shape of the parts. And according to the customer's needs, the power cutting tool function module with front and side milling function can be installed to complete the precision machining of complex shaft parts.
Company Certificate
We regard quality as our life. From quotation, customer order, equipment, material, production, surface treatment, to inspection, to final packaging, every step must be perfect.
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