Flat Socket Cap Screw

A flat socket cap screw, also known as a flat head socket cap screw, is a type of threaded fastener designed for securing two or more components together. It belongs to the broader category of socket cap screws and is characterized by its specific head shape and drive style.

Here are the key features that define a flat socket cap screw:

1. Head Shape: The defining feature of a flat socket cap screw is its flat or countersunk head. The head is designed to sit flush with the surface of the material it is fastened into, providing a smooth and aesthetically pleasing finish. The flat head allows it to be used in applications where a protruding fastener might be undesirable.
2. Drive Style: Flat socket cap screws typically have a hexagonal recess (socket) in their head. This recess accommodates a hex key or Allen wrench for tightening and loosening the screw. This drive style provides a more secure and less likely to strip connection compared to other types of drives.
3. Threaded Shank: Like most screws, flat socket cap screws have a threaded shank that runs along their entire length. The threads are used to engage with a corresponding threaded hole or nut, securing the components together when tightened.
4. Material and Finish: Flat socket cap screws are available in various materials, with common options including steel, stainless steel, brass, and more. The choice of material depends on the specific application and the required properties such as strength, corrosion resistance, or aesthetics. These screws can also be found with different finishes, including plain, zinc-plated, or coated for added protection.
5. Size and Length: Flat socket cap screws come in a range of sizes, typically specified by their thread diameter (e.g., M4, 1/4″) and length. The length of the screw is important because it determines how deeply it can be driven into the material and how securely it fastens the components together.

Flat socket cap screws are commonly used in a wide range of applications, including machinery, automotive, electronics, and furniture assembly, among others. They are particularly favored when a flush, low-profile appearance is desired, and where access for tightening with an Allen wrench or hex key is possible.

Flat Socket Cap Screw

Made from steel comparable to Grade 5 steel, these bolts are suitable for
most work-holding applications. They’re often used to hold sieve-shaker
screens in place and have a hook on one end that grabs as the other end
is tightened with a nut. Material meets SAE J429 specifications for quality.