Custom SEMS Screw with Plastic Washer & Metal Spacer – China Suppliers & Factory for Efficient Fastening Solutions
Integrated Fastening Solution
This product is a type of non-standard combination screw (Sems Screw), which adopts a disc head structure and is designed with pre-installed plastic and metal washers. It integrates fastening, buffering, and insulation functions, and is suitable for application scenarios that require high assembly efficiency and structural stability.
By pre-assembling the structure, it is possible to effectively reduce manual packaging processes and significantly improve production line efficiency, making it a cost-effective choice for modern manufacturing.
Design & Structural Advantages
The main body of the product is a small-sized self-tapping or machine tooth structure, suitable for thin plate connection or precision component fixation. The screw head is designed as a disc head, with a large force area, which helps to disperse pressure and avoid damage to the installation surface.
- ✓ Metal Gaskets: Enhance the stability of structural support.
- ✓ Plastic Gaskets: Play a buffering, isolation, and protective role.
This combination effectively reduces vibration transmission and minimizes direct contact between metals, thereby improving overall reliability.
Practical Applications
In practical applications, this type of combination screw is particularly suitable for electronic devices, precision instruments, and lightweight structural assembly. It is widely used in scenarios such as circuit board fixation, shell connection, or module installation.
Ensures secure attachment in high-vibration environments.
Plastic washers provide necessary electrical isolation.
Pre-installed structure reduces the risk of component loss.
Materials & Surface Treatment
The product can be made of carbon steel or stainless steel according to different needs. It supports multiple surface treatment processes to meet anti-corrosion and appearance requirements in different environments:
The material and thickness of the plastic gasket can also be adjusted according to the application scenario to achieve more accurate assembly results.
Customization & Industry Use
This type of non-standard combination screw supports customization according to the drawing, and can flexibly adjust the head shape, thread specifications, gasket structure, and combination form.
It is widely used in consumer electronics, household appliances, automation equipment, and various industrial products, serving as an ideal fastening solution to improve assembly efficiency and structural stability.
Frequently Asked Questions
Q What is a Sems Screw (combination screw) and how does it differ from a standard screw?
A Sems Screw is a non-standard combination fastener that comes with pre-assembled washers — both plastic and metal — permanently retained on the screw shank. Unlike standard screws, Sems Screws eliminate the need to handle separate washers during assembly, reducing installation time, preventing component loss, and improving overall production line efficiency.
Q What materials are available for this combination screw?
This combination screw is available in carbon steel and stainless steel, depending on your application requirements. Various surface treatments are also supported, including black oxidation, galvanizing, nickel plating, and custom coatings, to meet different anti-corrosion and aesthetic standards.
Q What industries and applications are these screws best suited for?
These combination screws are widely used in consumer electronics, household appliances, precision instruments, automation equipment, and various industrial products. They are especially ideal for circuit board fixation, shell connection, and module installation where insulation, vibration resistance, and stable locking are critical.
Q Can the plastic gasket material and thickness be customized?
Yes. The material and thickness of the plastic gasket can be adjusted based on your specific application scenario. This allows for more precise assembly results, better buffering performance, and improved electrical insulation tailored to your product's requirements.
Q Do you support custom drawings or OEM specifications?
Absolutely. This product fully supports customization according to customer drawings. Head shape, thread specifications, gasket structure, and the overall combination form can all be flexibly adjusted to meet your specific OEM or engineering design requirements.
Q How does the pre-assembled washer design improve manufacturing efficiency?
The pre-installed washer structure means that both plastic and metal washers are already secured to the screw before delivery. This eliminates manual sorting and assembly of individual components on the production line, significantly reducing packaging steps, minimizing the risk of missing parts, and speeding up overall assembly throughput.