.250-28 UNF-3B Dimensions: A Comprehensive Guide
Overview
The .250-28 UNF-3B is a type of screw thread commonly used in various industrial applications. Understanding the dimensions of this thread is crucial for ensuring proper fit, function, and safety in various machinery and equipment. In this article, we will delve into the dimensions of the .250-28 UNF-3B thread and provide a comprehensive guide for engineers, manufacturers, and enthusiasts.
Thread Diameter
The thread diameter of the .250-28 UNF-3B is 0.250 inches (6.35 mm). This is the outer diameter of the thread, which is the distance from the crest of one thread to the crest of the adjacent thread.
Threads Per Inch (TPI)
The .250-28 UNF-3B thread has 28 threads per inch (TPI). This means that there are 28 threads in a single inch of the screw or bolt.
Thread Series
The .250-28 UNF-3B thread belongs to the UNF (Unified National Fine) thread series. This thread series is commonly used in aerospace, defense, and other high-performance applications.
Thread Class
The .250-28 UNF-3B thread has a Class 3B thread fit, which means it has a tight tolerance and is used in applications where high precision and reliability are critical.
Minor Diameter
The minor diameter of the .250-28 UNF-3B thread is 0.226 inches (5.74 mm). This is the inner diameter of the thread, which is the distance from the root of one thread to the root of the adjacent thread.
Major Diameter
The major diameter of the .250-28 UNF-3B thread is 0.250 inches (6.35 mm). This is the outer diameter of the thread, which is the distance from the crest of one thread to the crest of the adjacent thread.
Pitch
The pitch of the .250-28 UNF-3B thread is 0.036 inches (0.91 mm). This is the distance between two consecutive threads.
Thread Length
The thread length of the .250-28 UNF-3B thread varies depending on the application and the specific requirements of the project.
Conclusion
In conclusion, understanding the dimensions of the .250-28 UNF-3B thread is crucial for ensuring proper fit, function, and safety in various industrial applications. By knowing the thread diameter, threads per inch, thread series, thread class, minor diameter, major diameter, pitch, and thread length, engineers and manufacturers can design and manufacture high-quality products that meet the required specifications.
