What is the size of 12 Point Flange Screws?
Dec 16, 2025| When it comes to fasteners, 12 Point Flange Screws are a popular choice in various industries due to their unique design and functionality. As a supplier of 12 Point Flange Screws, I often receive inquiries about their size. In this blog post, I will delve into the details of the size of 12 Point Flange Screws, providing you with a comprehensive understanding of this essential fastener.
Understanding the Basics of 12 Point Flange Screws
Before we discuss the size, let's briefly understand what 12 Point Flange Screws are. These screws have a 12-point socket drive, which provides a better grip and higher torque transfer compared to traditional hex socket screws. The flange at the base of the screw acts as a washer, distributing the load evenly and preventing the screw from loosening. This design makes 12 Point Flange Screws ideal for applications where high torque and stability are required.
Measuring the Size of 12 Point Flange Screws
The size of 12 Point Flange Screws is typically specified by several key dimensions: diameter, length, and thread pitch.
Diameter
The diameter of a 12 Point Flange Screw refers to the width of the screw shaft. It is usually measured in inches or millimeters. Common diameters for 12 Point Flange Screws range from small sizes like #2 (approximately 0.086 inches or 2.18 mm) to larger sizes such as 1/2 inch (12.7 mm). The choice of diameter depends on the specific application and the load the screw needs to bear. For light-duty applications, smaller diameters may be sufficient, while heavy-duty applications often require larger diameters.
Length
The length of a 12 Point Flange Screw is measured from the underside of the flange to the tip of the screw. It is also measured in inches or millimeters. The length is an important factor as it determines how far the screw will penetrate into the material. For example, if you are fastening two thin sheets of metal, a shorter screw may be appropriate. On the other hand, if you are attaching a thick piece of wood to a metal frame, a longer screw will be needed to ensure a secure connection. Common lengths for 12 Point Flange Screws can range from 1/4 inch (6.35 mm) to several inches, depending on the application.
Thread Pitch
The thread pitch is the distance between adjacent threads on the screw. It is measured in threads per inch (TPI) for imperial measurements or millimeters for metric measurements. A finer thread pitch (more threads per inch or a smaller millimeter measurement) provides a stronger hold but may require more torque to install. A coarser thread pitch, on the other hand, is easier to install but may not provide as strong a hold. The appropriate thread pitch depends on the material being fastened and the specific requirements of the application.
Standard Sizes of 12 Point Flange Screws
In the market, there are standard sizes of 12 Point Flange Screws that are widely used. These standard sizes ensure compatibility and interchangeability across different applications and industries.
Imperial Sizes
In the imperial system, common sizes of 12 Point Flange Screws include:
- #4 x 1/4 inch: This is a relatively small screw with a diameter of approximately 0.112 inches and a length of 1/4 inch. It is often used in light-duty applications such as electronics and small machinery.
- 1/4 - 20 x 1 inch: This screw has a diameter of 1/4 inch and a thread pitch of 20 threads per inch. The length of 1 inch makes it suitable for a variety of medium-duty applications.
- 3/8 - 16 x 2 inches: With a larger diameter of 3/8 inch and a thread pitch of 16 threads per inch, this screw is commonly used in heavy-duty applications such as automotive and construction.
Metric Sizes
In the metric system, common sizes of 12 Point Flange Screws include:
- M3 x 6 mm: This is a small screw with a diameter of 3 mm and a length of 6 mm. It is often used in precision applications such as watchmaking and small electronic devices.
- M6 x 12 mm: With a diameter of 6 mm and a length of 12 mm, this screw is suitable for medium-duty applications in the metric system.
- M10 x 25 mm: This larger screw with a diameter of 10 mm and a length of 25 mm is commonly used in heavy-duty metric applications.
Custom Sizes of 12 Point Flange Screws
In addition to the standard sizes, we also offer custom sizes of 12 Point Flange Screws to meet the specific needs of our customers. If you have a unique application that requires a non-standard diameter, length, or thread pitch, we can manufacture 12 Point Flange Screws according to your specifications. Our advanced manufacturing facilities and experienced engineering team ensure that we can produce high-quality custom screws with precision and efficiency.
Applications of 12 Point Flange Screws
12 Point Flange Screws are used in a wide range of applications across various industries:
Automotive Industry
In the automotive industry, 12 Point Flange Screws are used to secure engine components, suspension parts, and body panels. Their high torque transfer and stability make them ideal for withstanding the vibrations and stresses experienced in vehicles.


Construction Industry
In construction, 12 Point Flange Screws are used to fasten structural elements such as steel beams, wooden frames, and concrete forms. Their ability to distribute the load evenly helps to ensure the integrity of the structure.
Electronics Industry
In the electronics industry, 12 Point Flange Screws are used to assemble electronic devices such as computers, smartphones, and televisions. Their small size and precision make them suitable for use in delicate electronic components.
Machinery Industry
In the machinery industry, 12 Point Flange Screws are used to secure machine parts, gears, and bearings. Their high strength and durability make them reliable for use in heavy machinery.
Related Products
If you are interested in other types of screws, we also offer a wide range of related products. For example, our Slotted Truss Head Machine Screws are suitable for applications where a flat, low-profile head is required. Our Metric Flat Head Screws are designed for use in metric applications and provide a flush finish. And our Type II Cross Recessed Truss Head Screws offer a high level of torque transfer and are easy to install.
Contact Us for Your Screw Needs
Whether you need standard or custom sizes of 12 Point Flange Screws, we are here to provide you with high-quality products and excellent service. Our team of experts can help you choose the right screws for your specific application and ensure that you get the best value for your money. If you have any questions or would like to discuss your screw requirements, please do not hesitate to contact us. We look forward to working with you and meeting your fastening needs.
References
- Machinery's Handbook, 31st Edition
- Fastener Standards: A Guide to ISO, ASME, and Other Standards
- Automotive Fastener Design and Application Handbook

