There is a wide variety of special fasteners available for specific applications. Some of the categories of special fasteners include:

1. Aerospace Fasteners: These are specialized fasteners used in aviation and aerospace industries, including high-strength bolts, rivets, screws, and nuts.
2. Automotive Fasteners: These are fasteners designed specifically for use in automobiles, including bolts, nuts, and screws that are engineered to withstand the vibration, heat, and stress of automotive applications.
3. Electronic Fasteners: These are miniature fasteners used in electronic devices, including screws, nuts, and standoffs that are small enough to fit into tight spaces, yet strong enough to provide secure connections.
4. Medical Fasteners: These are specialized fasteners used in medical equipment and devices, including self-tapping screws, specialized washers, and other fasteners made from materials that can be sterilized.
5. Marine Fasteners: These are fasteners designed to withstand harsh saltwater environments, including stainless steel screws, bolts, and nuts that are resistant to corrosion.
6. Military Fasteners: These are specialized fasteners used in military equipment and vehicles, including high-strength bolts, nuts, and screws that are engineered to withstand extreme conditions.
7. Structural Fasteners: These are heavy-duty fasteners used in construction and engineering applications, including anchor bolts, structural screws, and other fasteners that are designed to hold large loads and provide long-lasting strength.

8. Custom Fasteners: These are fasteners that are custom-designed and manufactured to meet the specific needs of individual projects, including fasteners with unique shapes, sizes, and materials.