3/4-16 UNJF-3A Thread Dimensions
Introduction
The 3/4-16 UNJF-3A thread is a type of Unified National Joint thread, commonly used in aerospace and defense industries. This thread type is characterized by its unique dimensions, thread form, and tolerances, which provide a high level of consistency and reliability in fastening applications.
Thread Dimensions
The 3/4-16 UNJF-3A thread has the following dimensions:
- Major Diameter: 0.750 inches (19.05 mm)
- Pitch: 16 threads per inch (1.587 mm)
- Minor Diameter: 0.6875 inches (17.46 mm)
- Thread Length: varies depending on the application and fastener type
- Thread Angle: 3° (included angle)
- Root Radius: 0.125 inches (3.18 mm)
- Crest Radius: 0.050 inches (1.27 mm)
Thread Form
The 3/4-16 UNJF-3A thread has a unique thread form, characterized by:
- Thread Form Angle: 3° (included angle)
- Thread Crest: rounded or radiused
- Thread Root: rounded or radiused
- Thread Flank: straight or slightly curved
Tolerances
The 3/4-16 UNJF-3A thread has specific tolerances to ensure proper fit and function:
- Major Diameter Tolerance: +0.0015 inches (-0.0000 inches)
- Pitch Tolerance: ±0.0005 inches
- Minor Diameter Tolerance: -0.0015 inches (+0.0000 inches)
- Thread Length Tolerance: varies depending on the application and fastener type
Applications
The 3/4-16 UNJF-3A thread is commonly used in aerospace and defense industries for various applications, including:
- Fastening: bolts, screws, and other fasteners
- Assembly: assembly of components and sub-assemblies
- Structural: structural components and frames
Conclusion
The 3/4-16 UNJF-3A thread is a critical component in aerospace and defense industries, requiring precise dimensions, thread form, and tolerances to ensure proper fit and function. Understanding these specifications is crucial for designers, engineers, and manufacturers to ensure the reliability and performance of their products.
