3/4-16 UNJF Thread Dimensions
Overview
The 3/4-16 UNJF thread is a type of Unified National Joint thread, which is commonly used in aerospace and defense applications. UNJF threads are designed to provide a higher tensile strength and resistance to fatigue compared to other thread types. In this article, we will discuss the dimensions and characteristics of the 3/4-16 UNJF thread.
Thread Dimensions
The 3/4-16 UNJF thread has the following dimensions:
Major Diameter
- Nominal Major Diameter: 0.75 inches (19.05 mm)
- Maximum Major Diameter: 0.758 inches (19.26 mm)
- Minimum Major Diameter: 0.742 inches (18.84 mm)
Minor Diameter
- Nominal Minor Diameter: 0.665 inches (16.90 mm)
- Maximum Minor Diameter: 0.673 inches (17.07 mm)
- Minimum Minor Diameter: 0.657 inches (16.73 mm)
Pitch
- Thread Pitch: 16 threads per inch (1.588 mm pitch)
Thread Length
- Minimum Thread Length: 1.5 inches (38.1 mm)
- Maximum Thread Length: 2.5 inches (63.5 mm)
Thread Form
- Thread Form: UNJF (Unified National Joint)
- Thread Angle: 60 degrees
Thread Characteristics
The 3/4-16 UNJF thread has the following characteristics:
- Thread Class: 3A (Aerospace)
- Thread Fit: Free fit
- Thread Material: Typically made from high-strength steel or alloy materials
- Thread Finish: Cadmium or zinc-nickel plating for corrosion resistance
Applications
The 3/4-16 UNJF thread is commonly used in aerospace and defense applications, such as:
- Aircraft Fasteners: Used in structural assemblies, engine mounts, and other high-stress applications.
- Spacecraft Components: Used in structural assemblies, propulsion systems, and other critical applications.
- Defense Equipment: Used in missile systems, artillery, and other defense applications.
Conclusion
The 3/4-16 UNJF thread is a specialized thread type designed for high-stress applications in aerospace and defense industries. Its unique dimensions and characteristics make it an ideal choice for critical applications where reliability and safety are paramount.
