SEMS Machine Screws

SEMS Machine Screws For Rapid Assembly

SEMS Machine Screws in Standard & Custom Configurations-2

SEMS Machine Screws in Standard & Custom Configurations

SEMS screws, also known as pre-assembled screws and washers, are a unique and efficient fastening solution. The process involves the assembly of a washer onto a screw during the threading stage, which results in a single integrated unit. The washer remains tightly affixed to the screw, providing convenience during installation.

The design of SEMS screws facilitates faster product assembly. Thanks to their pre-assembled and lubricated components, the installation process is streamlined, enhancing both the overall output and productivity. This makes SEMS screws a popular choice in various industries that require efficient assembly processes.

SEMS screws are produced following international standards, but we also offer customized combinations to suit your specific design or automation needs. Their design is such that the screw and washer are combined before the thread rolling process. The threads are larger than the initial diameter, ensuring that the washer stays securely in place without falling loose. This enhances the reliability of SEMS screws in a range of applications.

Quality Assurance for SEMS Screws

Within our manufacturing operations, we dedicate ourselves to ensuring the exceptional quality of each SEMS screw we fabricate. All orders are put through detailed quality evaluations and extensive inspections, underlining the steadfast quality we pledge for all our products.

Our exhaustive inspection procedures guarantee that every group of screws is carefully examined to meet our strict quality criteria. To validate our dedication to high-quality, an inspection certificate is included with every delivery. If you have any unique requirements related to our quality control process, please share them with us, and we’ll do our utmost to cater to your specific demands.

SEMS Screws Configurations

Please check our screw specifications page to see the wide range of options we can supply or contact us now with your detailed requirements.

Common Screw Materials

Choose based on the product’s intended use, application method, and customer requirements.

Stainless Steel:

Commonly used types include SUS302, SUS304, SUS316, SUS410. A special type called NSSC550 is exclusive to Cheng Hao, which has high hardness, high corrosion resistance, and high acid resistance. Its rust prevention is 15 times better than existing materials for screws.

Carbon Steel:

Low carbon steel, medium carbon steel, high carbon steel.

Alloy Steel:

Refers to steel materials that, besides containing carbon, also have other alloying elements such as silicon, manganese, chromium, nickel, vanadium, molybdenum, etc.

Aluminum Alloy:

Common material codes include 2011, 2024, 6061, 6082, 7075.


Brass (Yellow brass), Bronze.

Common Surface Treatment Methods

Choose based on the product’s intended use, application method, and customer requirements.

Yellow Zinc
Black Zinc
Ruspert Sliver
Powder Coating
Thread Lock
Nickel Plated
Black Oxide

SEMS Screws Packaging

We can offer customers a wide range of custom packaging options for your orders to suit your particular distribution needs. Please let us know and we will do our best to oblige you with the best packaging option for you.

Plastic Boxes
Cardboard Packaging
Printed Packaging
Blister Packs

Other Types of Machine Screws that We Supply

Please view our commonly ordered screw types below or let us know your special requirements for custom screws.

Premium Lathe Tool Holder Machine Screws: Stainless Steel Strength & Efficiency

Lathe Tool Holder Screws

Engineered for high-performance applications, our lathe tool holder screws ensure secure mounting and easy operation of your tool holders. The design guarantees stability and reduces tool movement, providing you with a precise and accurate result every time.
Standard Machine Screws: Precision, Durability & ASME Compliance

Standard Screws

Standard machine screws are used in a huge range of industries including construction, engineering, automotive, aerospace, machinery, electronics, optics, medicine, and many more.
Cheng Hao: Custom Machine Screws for Your Unique Needs

Customized Screws

We are also able to produce completely customized machine screws in bulk to suit your individual project requirements, please contact us for more information about this.
T-Head Machine Screws: The Precision Solution for Sleek & Reliable Fastening

T-Head Screws

With a distinct T-head design, these screws offer a flush surface on one side and are ideal for sliding into T-slot profiles. They’re incredibly versatile, fitting a wide range of applications where a flat bearing surface is required.
Premium Micro Machine Screws: Precision Fasteners for Specialist Applications

Micro Screws

These are defined as machine screws with a diameter of M0.6 to M2.0 and we can deliver class leading and cost effective micro screw solutions to meet your micro diameter requirements.
Premium Socket Set Machine Screws: Versatility & Strength Combined

Socket Set Screws

These screws are used to secure an object inside or against another object and the length of the screw can be customized according to customers needs. These set screws are usually headless so that the screw does not protrude above the surface of the machined part and avoids interference with other components

These are some of the most frequently asked questions by our customers. We hope they are helpful to you. If you cannot find the answer you need, please contact us using the inquiry button below.

We are a professional precision screw manufacturer operating directly. We also represent various fastener products from Taiwan, forming a comprehensive supply chain to ensure quality. We welcome your inquiries.

Our product range includes screws, bolts, nuts, precision small screws, SEMS screws, washers, rivets, CNC precision machining, metal stamped parts, and a variety of custom fasteners.

View our products

The delivery time largely depends on the quantity of the order. We have some standard specification products in stock, while custom products typically take between 30 to 75 days for delivery.

Yes, we can provide samples upon request. However, due to the vast array of screw specifications, we might not have the exact specifications you need in stock. In that case, we will send you products with similar specifications for your reference.

If you require a customized product, we will produce a small batch of samples for your approval after you place your order. Once you confirm the samples, we will proceed with mass production.

Request a sample

Customization is our forte. You can provide us with diagrams, design drawings, or a list of requirements, and our expert team will provide a quote based on your specifications.

Send us your design

Please provide the specifications and quantity of the screws you need. Specifications should include material, surface treatment, head type, driver type, thread type, point type, and dimensions (Metric, Imperial, US).

The MOQ varies depending on the material. As a professional screw manufacturer, our MOQ is 50,000 pieces for stainless steel and 100,000 pieces for carbon steel. This requirement, which may seem high to some customers, is designed to ensure product quality, cost-effectiveness, production efficiency, and shipping efficiency, and to pass on price benefits to customers. For special-purpose screws or orders with a high total quantity, we also support a lower MOQ, making cooperation very convenient.

Carbon steel screws will rust when exposed to moisture unless they are coated with an anti-rust coating or made of stainless steel. However, if the anti-rust coating is worn or chipped due to external factors, thereby reducing its anti-rust strength, rust may occur under the coating. Stainless steel screws are the most resistant to rust and corrosion. Although they are more expensive, their rust resistance is not easily reduced because the entire structure of the screw is stainless steel.

Our products are certified by ISO 9001, which is an international standard for quality management systems. This certification ensures that we adhere to best practices for producing high-quality products that meet our customers’ expectations and requirements.

Some of our products also have CE certification, which is a mark that indicates conformity with health, safety, and environmental protection standards for products sold within the European Economic Area. Please contact us for CE-certified products.

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