Sems Screws
YH FASTENER provides SEMS screws pre-assembled with washers for efficient installation and reduced assembly time. They offer strong fastening and vibration resistance in various machinery applications.
Square spacer design: Unlike traditional round spacers, square spacers can provide a wider support area, thereby reducing the pressure of the screw head on the surface of the material, effectively preventing plastic deformation or damage to the material.
We are proud of our range of combination screws known for their superior quality and versatility. Unlike traditional screws, our combination screws are specially designed to easily penetrate different types of materials and provide a strong connection, making them an indispensable and critical component in a variety of projects.
The Screw-Spacer Combo is a specially designed fastener that combines the advantages of screws and spacers to provide a more secure, reliable connection. Screw-to-gasket combinations are often used in applications where enhanced sealing and reduced risk of loosening are required, such as in mechanical equipment, piping connections and construction work.
Our one-piece combination screws are designed with screw-through gaskets to provide you with a more convenient and efficient installation solution. This type of screw combines the screw itself with a spacer, simplifying the installation process while providing superior retention performance and durability.
Combination screws are a unique mechanical connection element that uses an intelligent combination of screws and spacers to achieve a more robust and reliable connection. This design makes the screw suitable for applications that require additional sealing or shock absorption.
In combination screws, the threaded part of the screw is combined with a spacer, which can not only provide a good connection force, but also effectively prevent loosening and falling off. At the same time, the presence of a spacer provides gap filling and sealing of the connecting surface, which further enhances the use of the screw.
Our combination screws use Captivs Screws technology, which means that the screw heads have a fixed recessed structure, making installation and removal even more convenient and quick. There is no need to worry about screws slipping or missing, providing users with great operational convenience.
This combination screw is designed with an Allen socket head for easy and stable tightening. The Allen head can provide better power transfer and reduce the risk of slippage and slip damage. Whether you’re manually operating or using a power tool, you can easily tighten your screws and increase your productivity.
Thanks to the design superiority of this combination screw, you can save valuable time and effort during installation. By eliminating the need for additional gasket preparation and installation, you can complete fastening tasks faster and improve overall engineering efficiency. It is a practical tool that is especially important in projects that require a large number of screw connections.
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SEMS screws integrate a screw and washer into a single pre-assembled fastener, with a built-in washer under the head to enable rapid installation, enhanced durability, and adaptability to diverse applications.

As a premium SEMS screw manufacturer, Yuhuang Fasteners delivers versatile SEMS screws customizable to your exact specifications.We produce stainless steel SEMS screws, brass SEMS screws,Carbon steel Sems Screw, etc

Pan Phillips SEMS Screw
A dome-shaped flat head with Phillips drive and integrated washer, ideal for low-profile, anti-vibration fastening in electronics or panel assemblies.

Allen Cap SEMS Screw
Combines a cylindrical Allen socket head and washer for high-torque precision in automotive or machinery requiring corrosion-resistant secure fastening.

Hex Head with Phillips SEMS Screw
Hexagonal head with dual Phillips drive and washer, suited for industrial/construction applications needing tool versatility and heavy-duty grip.
1.Machinery Assembly: Combination screws secure vibration-prone components (e.g., motor bases, gears) to withstand dynamic loads in industrial equipment.
2.Automotive Engines: They fix critical engine parts (blocks, crankshafts), ensuring stability under high-speed operation.
3.Electronics: Used in devices (computers, phones) to fasten PCBs/casings, maintaining structural integrity and reliability.
At Yuhuang, securing custom fasteners is structured into four core phases:
1.Specification Clarification:Outline material grade, precise dimensions, thread specifications, and head configuration to align with your application.
2.Technical Collaboration:Collaborate with our engineers to refine requirements or schedule a design review.
3.Production Activation:Upon approval of finalized specifications, we initiate manufacturing promptly.
4.Timely Delivery Assurance:Your order is expedited with rigorous scheduling to guarantee on-time arrival, meeting critical project milestones.
1. Q: What is a SEMS screw?
A: A SEMS screw is a pre-assembled fastener combining a screw and washer into one unit, designed to streamline installation and enhance reliability in automotive, electronics, or machinery.
2. Q: Application of combination screws?
A: Combination screws (e.g., SEMS) are used in assemblies requiring anti-loosening and vibration resistance (e.g., automotive engines, industrial equipment), reducing part count and boosting installation efficiency.
3. Q: Assembly of combination screws?
A: Combination screws are rapidly installed via automated equipment, with pre-attached washers eliminating separate handling, saving time and ensuring consistency for high-volume production.