5/16-20 Thread Dimensions: Understanding the Specifications
When it comes to thread dimensions, accuracy is crucial to ensure proper fitment and functionality. The 5/16-20 thread dimension is a common size used in various applications, including bolts, screws, and fasteners. In this article, we will delve into the specifications and dimensions of the 5/16-20 thread size.
Thread Size and Classification
The 5/16-20 thread size belongs to the Unified Thread Standard (UTS) classification. The "5/16" refers to the major diameter of the thread, which is 5/16 of an inch or 0.3125 inches (7.94 mm). The "-20" refers to the threads per inch (TPI), which is 20 threads per inch.
Thread Dimensions
Here are the key dimensions for a 5/16-20 thread:
Major Diameter
- Major Diameter: 0.3125 inches (7.94 mm)
- Major Diameter Tolerance: +0.003 inches (-0.000 inches) to +0.006 inches (-0.003 inches)
Pitch Diameter
- Pitch Diameter: 0.2812 inches (7.15 mm)
- Pitch Diameter Tolerance: +0.002 inches (-0.002 inches) to +0.005 inches (-0.004 inches)
Minor Diameter
- Minor Diameter: 0.2500 inches (6.35 mm)
- Minor Diameter Tolerance: -0.002 inches (+0.002 inches) to -0.005 inches (+0.004 inches)
Thread Length and Engagement
The thread length and engagement are critical factors to consider when working with 5/16-20 threads. The thread length refers to the distance from the end of the fastener to the point where the thread begins. The engagement refers to the length of thread engagement between the fastener and the mating part.
- Thread Length: Varies depending on the application and type of fastener
- Thread Engagement: Typically 2-3 times the major diameter (0.625-0.9375 inches or 15.88-23.88 mm)
Conclusion
In conclusion, understanding the 5/16-20 thread dimensions is essential for ensuring proper fitment and functionality in various applications. By following the specifications and tolerances outlined in this article, you can ensure that your threaded connections are secure and reliable.
