.250-20 UNC-2A: Understanding the Threads and Fasteners
In the world of fasteners and threads, there are numerous standards and specifications that govern their design, manufacture, and application. One such standard is the .250-20 UNC-2A thread, which is widely used in various industries. In this article, we will delve into the details of this thread standard, its features, and applications.
What is .250-20 UNC-2A?
The .250-20 UNC-2A thread is a type of fastener thread that conforms to the Unified National Coarse (UNC) thread standard. The "250" in the designation refers to the major diameter of the thread, which is 0.250 inches or 6.35 mm. The "20" denotes the threads per inch, which is 20 threads per inch. The "UNC" specifies that the thread is a Unified National Coarse thread, and the "2A" refers to the thread class, which indicates the thread's tolerance and acceptability.
Features of .250-20 UNC-2A Threads
The .250-20 UNC-2A thread has several features that make it suitable for various applications:
- Major Diameter: 0.250 inches (6.35 mm)
- Threads per Inch: 20
- Thread Class: 2A
- Thread Form: Unified National Coarse (UNC)
- Tolerance: The thread has a tolerance of ±0.0005 inches (±0.013 mm) for the major diameter and ±0.001 inches (±0.025 mm) for the pitch diameter.
Applications of .250-20 UNC-2A Threads
The .250-20 UNC-2A thread is commonly used in various industries, including:
- Aerospace: The thread is used in aerospace applications due to its high strength-to-weight ratio and resistance to corrosion.
- Automotive: The thread is used in automotive applications, such as engine mounts, shock absorbers, and suspension components.
- Industrial: The thread is used in industrial applications, such as machinery, equipment, and piping systems.
- Construction: The thread is used in construction applications, such as building fasteners and anchor bolts.
Conclusion
In conclusion, the .250-20 UNC-2A thread is a widely used fastener thread standard that offers high strength, corrosion resistance, and versatility. Its features and applications make it an ideal choice for various industries, including aerospace, automotive, industrial, and construction. By understanding the characteristics and tolerances of this thread standard, engineers and manufacturers can ensure the reliability and performance of their products.
