SEMS Screw Manufacturer | Custom SEMS Screws Supplier
As a SEMS Screw Manufacturer with 19 years of experience, Zeyao focuses on the R&D and mass production of non-standard SEMS Screws, providing stable and customizable fastening solutions to customers worldwide.
Zeyao specializes in producing custom fasteners, including screws, bolts, nuts, washers, pins, gaskets, supports, rivets, CNC milled parts, and CNC turned parts. Our products are widely used in numerous industries, including automotive manufacturing, electronics, construction, aerospace, industrial machinery, medical devices, furniture, home furnishings, and rail transportation.
Rich Experience
Established in 2006, Huizhou Zeyao Hardware Products Co., Ltd. has accumulated over 18 years of expertise in manufacturing high-quality fasteners.
Quality Control
All our products comply with ROHS standards, and we maintain a stringent quality control system throughout the entire production process to ensure superior product quality.
Customized Services
We offer tailored solutions based on customer requirements, providing customized production according to specific drawings or samples.
Advanced Production Technology
Our production capabilities encompass cold forming, automatic lathing, automatic milling, and CNC machining, enabling us to meet diverse customer needs efficiently.
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Metric SEMS ScrewsType: Metric SEMS Screwsview more
Structure: Screw and Washer Assembly
Thread Size: M2–M8 / Custom Sizes Available
Washer Type: Flat Washer, Spring Washer, Custom Washer
Material:... -
Combination ScrewThis combination screw is a combination of screws and flat washers fastened together by a specific process. The head adopts a cup head design, and the screw is added with thread glue, which makes...view more
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Connection Screw with Square WasherThe square washer increases the friction between the bolt and nut, which helps to prevent loosening, even under stress and vibration. and the square washer helps to increase the contact area...view more
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Hex Head Screw with Flat and Split Lock WasherThe hex head screws with a flat and split lock washer, combine a screw, flat washer, and split lock washer into one assembly, this makes it easy and efficient to install, which no need to search...view more
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Pan Head Screws with External-Tooth Lock WasherThe pan head screws with an external-tooth lock washer are designed for reliability and security, especially in environments where vibration or frequent use could lead to loosening. The key...view more
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Socket Head Screws with Flat WasherThe socket head screws with a flat washer is a versatile and reliable fastening, it combines a screw, a flat washer, and a spring washer, there’s no need to search for or install each part...view more
Specification
|
D |
P |
Dk |
K |
S |
Dc |
H |
T |
|
M2 |
0.4 |
3.8 |
2 |
1.56 |
5 |
0.55 |
0.58 |
|
M2.5 |
0.45 |
4.5 |
2.5 |
2.06 |
6 |
0.55 |
0.58 |
|
M3 |
0.5 |
5.7 |
3 |
2.58 |
7 |
0.55 |
0.9 |
|
M4 |
0.7 |
7.2 |
4 |
3.08 |
9 |
0.9 |
1.2 |
|
M5 |
0.8 |
8.72 |
4.98 |
4.1 |
10 |
1.1 |
1.4 |
|
M6 |
1 |
10.22 |
6 |
5.14 |
12 |
1.8 |
1.7 |
|
M8 |
1.25 |
13.3 |
8 |
6.14 |
16 |
2.2 |
2.1 |
|
M10 |
1.5 |
16.27 |
10 |
8.17 |
20 |
2.7 |
2.7 |
|
M12 |
1.75 |
18.25 |
12 |
10.17 |
24 |
3.3 |
3.2 |
Custom SEMS Screws
As an experienced SEMS Screw Manufacturer, Zeyao provides highly flexible OEM / ODM customization services, covering all requirements from structural design to appearance.
Screw Type & Dimension Customization
Machine screws, self-tapping screws, electronic screws
Diameter, length, thread pitch, and tolerances
Special head styles (pan head, round head, countersunk head, low-profile head)
Washer Configuration
Flat washer + spring washer combinations
Single flat washer or multi-washer assemblies
Special functional washers (anti-loosening, vibration-resistant)
Material Options
Carbon steel
Stainless steel 304 / 316
Alloy steel
Brass or special materials upon request
Surface Treatment
Zinc plating (blue/white, black)
Nickel / chrome plating
Black oxide
Passivation
Customized functional coatings
Packaging & Branding
Bulk packaging / small retail packaging
Packaging compatible with automated assembly lines
Customer-branded labeling and project-specific packaging solutions
Advantages of SEMS Screw
Fast Installation
Since SEMS are complete with a washer, this makes the installation of your components faster and easier. It removes the added step of finding the right washer and installing it onto the screw. Especially for small spaces and designs, SEMS can come in handy. This can increase productivity and reduce build time.
No Lost Washers
Losing a washer between cracks of a machine build can be a headache not only with time but with inventory and cost. With SEMS, the washer will be less likely to be lost during machine build. The machine builder can assemble with confidence that the washer is secure.
Fewer Part numbers on Your Bill of Materials
This benefit can often time be overlooked as it is simply one line. However, the use of screws and bolts in a machine is extensive and having to spec a washer for each one can be time-consuming so having fewer part numbers on your bill of materials can have a big impact on machine design.
Reduced Inventory
Inventory space can be a luxury for some and it’s surprising how much space a lot of washers can take up, not having to account for two separate part numbers are a benefit of pre-assembled screws in regards to inventory.
Great for Hard-to-Reach Areas
SEMS can also benefit the repair or service and disassembly processes especially in certain areas of the machine that are difficult to access. No more worrying about loose washers during disassembly. It’s both safer and less time-consuming.
Versatile Use
Pre-assembled screws can be used in a variety of applications from battery pack assembly to laboratory automation machines. Their versatility is vast.
Applications of SEMS Screw

Automotive Industry
Used in assembling vehicle components where reliability is crucial.

Electronics
Ideal for securing electronic devices where space is limited.

Appliances
Commonly used in household appliances for easy assembly and maintenance.

Machinery
Essential in heavy machinery where vibration resistance is necessary.
Surface Treatment Methods for SEMS Screws
Electroplating Surface Treatment Process
Electroplating surface treatment is a process that includes electrochemically depositing a thin layer of metal coating on the surface of the SEMS screw. Zinc, nickel, and chromium are the most commonly used metals for electroplating. Zinc electroplating is extensively used for SEMS screws because it is both corrosion resistant and cost-effective.
Hot-dip Galvanizing Surface Treatment Process
Hot-dip galvanizing is a surface treatment process that includes immersing the SEMS screw in a molten zinc bath to coat it with a thick layer of zinc. This process is popular for SEMS screws used in outdoor settings because it provides excellent corrosion resistance and can last for many years.
Black Oxide Coating Surface Treatment Process
The black oxide coating is a surface treatment process that involves chemically treating the surface of screws to create a black oxide layer that increases corrosion resistance and lubricity.
Phosphate Coating Surface Treatment Process
Phosphate surface treatment includes treating the surface of screws with a phosphate solution to produce a thin, porous layer of phosphate crystals that improve corrosion resistance and lubricant retention. This method is frequently used for SEMS screws that require a lot of lubrication.
Powder Coating Surface Treatment Process
Powder coating surface treatment process includes electrostatically adhering a dry powder coating to the surface of a SEMS screw. The powder is then cured with heat, causing it to melt and create a long-lasting, smooth coating. Powder coating is a popular SEMS screw surface treatment process due to its exceptional durability, corrosion resistance, and minimal environmental impact.
Packaging and Shipping
|
Packaging |
Plastic bag + outer carton + pallets |
|
Shipping |
We will help you to choose the best shipping way according to your detail requirements. By sea, by air, or by express, etc. |
Other Service Information
Accepted Delivery Terms
FOB, CFR, EXW, Express Delivery
Accepted Payment Currency
USD, EUR, CAD, AUD, CNY, CHF
Accepted Payment Type
T/T, L/C, Cash, Escrow
Language Spoken
English, Chinese
Our Certificate

FAQ
We're professional sems screw manufacturers and suppliers in China, specialized in providing high quality products and service. We warmly welcome you to wholesale customized sems screw made in China here from our factory.
Connection Screw with Square Washer, Hex Head Screw with Flat and Split Lock Washer, Socket Head Screws with Flat Washer
