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.

 

 
  • Metric SEMS Screws
    Type: Metric SEMS Screws
    Structure: Screw and Washer Assembly
    Thread Size: M2–M8 / Custom Sizes Available
    Washer Type: Flat Washer, Spring Washer, Custom Washer
    Material:...
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  • Combination Screw
    This 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...
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  • Connection Screw with Square Washer
    The 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...
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  • Hex Head Screw with Flat and Split Lock Washer
    The 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...
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  • Pan Head Screws with External-Tooth Lock Washer
    The 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...
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  • Socket Head Screws with Flat Washer
    The 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...
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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
Connection Screw With Square Washer

Automotive Industry

Used in assembling vehicle components where reliability is crucial.

washer hex bolt (2)

Electronics

Ideal for securing electronic devices where space is limited.

washer hex bolt (5)

Appliances

Commonly used in household appliances for easy assembly and maintenance.

Socket Head Screws With Flat Washer

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
01.

Accepted Delivery Terms

FOB, CFR, EXW, Express Delivery

02.

Accepted Payment Currency

USD, EUR, CAD, AUD, CNY, CHF

03.

Accepted Payment Type

T/T, L/C, Cash, Escrow

04.

Language Spoken

English, Chinese

 

 

Our Certificate

 

productcate-1-1

 

 

FAQ

 

Q: What is a SEMS screw?

A: A SEMS screw is a type of fastener that combines a screw and a washer permanently attached to it. It's also known as a pre - assembled screw and washer.

Q: How are SEMS screws different from ordinary screws?

A: Ordinary screws require separate washers to be installed when in use, while SEMS screws have the washer pre - assembled, which can save installation time and reduce the risk of component loss.

Q: Are SEMS screws more expensive than ordinary screws?

A: Generally, the cost of SEMS screws is slightly higher than that of ordinary screws due to the additional process of pre - assembling the washer. However, considering the savings in assembly time and reduced risk of errors, the overall cost - effectiveness is often higher in many applications.

Q: How to choose the appropriate SEMS screw?

A: Consider factors such as the diameter and length of the screw according to the actual application requirements, the type of washer needed (depending on the specific function, such as vibration resistance, electrical conductivity, etc.), and the material of the screw and washer to ensure that it can meet the needs of the application.

Q: Can SEMS screws be used in high - vibration environments?

A: SEMS screws with lock washers, such as internal or external tooth lock washers, can provide better vibration resistance and are suitable for use in high - vibration environments to a certain extent. However, in extremely high - vibration conditions, additional anti - loosening measures may be required.

Q: Can SEMS screws be reused?

A: In most cases, SEMS screws can be reused, but it depends on the specific situation. If the screw and washer are not damaged during use and the thread is still in good condition, they can be removed and reused. However, if there is damage such as thread stripping or washer deformation, it is not recommended to reuse them.

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
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