.250-20 UNC-2B Dimensions: A Comprehensive Guide
The .250-20 UNC-2B thread is a type of screw thread commonly used in various industrial and engineering applications. Understanding the dimensions of this thread is crucial for ensuring proper fitting and assembly of parts. In this article, we will delve into the dimensions of the .250-20 UNC-2B thread and provide a comprehensive guide for engineers, manufacturers, and technicians.
Thread Description
The .250-20 UNC-2B thread is a Unified National Coarse (UNC) thread with a major diameter of 0.250 inches and 20 threads per inch. The "2B" designation indicates that the thread is a class 2B thread, which means it has a moderate fit and is suitable for general-purpose applications.
Thread Dimensions
The following are the dimensions for the .250-20 UNC-2B thread:
Major Diameter
The major diameter of the .250-20 UNC-2B thread is 0.250 inches (6.35 mm).
Minor Diameter
The minor diameter of the .250-20 UNC-2B thread is 0.216 inches (5.49 mm).
Pitch
The pitch of the .250-20 UNC-2B thread is 0.050 inches (1.27 mm).
###Threads per Inch
The .250-20 UNC-2B thread has 20 threads per inch.
###Thread Angle
The thread angle of the .250-20 UNC-2B thread is 60 degrees.
###Thread Length
The thread length of the .250-20 UNC-2B thread is typically specified by the manufacturer or designer.
Tolerances
The tolerances for the .250-20 UNC-2B thread are as follows:
###Major Diameter Tolerance
The major diameter tolerance for the .250-20 UNC-2B thread is ±0.0005 inches (±0.013 mm).
###Minor Diameter Tolerance
The minor diameter tolerance for the .250-20 UNC-2B thread is ±0.001 inches (±0.025 mm).
###Thread Pitch Tolerance
The thread pitch tolerance for the .250-20 UNC-2B thread is ±0.0005 inches (±0.013 mm).
Applications
The .250-20 UNC-2B thread is widely used in various industries, including:
Aerospace
The .250-20 UNC-2B thread is used in aerospace applications due to its high strength-to-weight ratio and resistance to corrosion.
Automotive
The .250-20 UNC-2B thread is used in automotive applications, such as engine mounts and suspension components.
Industrial Equipment
The .250-20 UNC-2B thread is used in industrial equipment, such as pumps, valves, and compressors.
Conclusion
In conclusion, the .250-20 UNC-2B thread is a widely used thread type in various industries. Understanding the dimensions and tolerances of this thread is crucial for ensuring proper fitting and assembly of parts. By following the guidelines outlined in this article, engineers, manufacturers, and technicians can ensure that their products meet the required standards and specifications.
