.25-20 Screw Dimensions: A Comprehensive Guide
The .25-20 screw is a type of fastener commonly used in various industries, including aerospace, defense, and industrial manufacturing. Its unique dimensions and thread configuration make it an essential component in many applications. In this article, we will delve into the detailed dimensions of the .25-20 screw and explore its uses and benefits.
Thread Dimensions
The .25-20 screw has a thread diameter of 0.25 inches (6.35 mm) and a thread pitch of 20 threads per inch (TPI). The thread length is typically 1/4 inch (6.35 mm) to 1/2 inch (12.7 mm), depending on the application requirements.
Major Diameter
The major diameter of the .25-20 screw is 0.25 inches (6.35 mm), which is the largest diameter of the screw thread.
Minor Diameter
The minor diameter of the .25-20 screw is 0.212 inches (5.38 mm), which is the smallest diameter of the screw thread.
Thread Length
The thread length of the .25-20 screw can vary, but common lengths include:
- 1/4 inch (6.35 mm)
- 1/2 inch (12.7 mm)
- 3/4 inch (19.05 mm)
- 1 inch (25.4 mm)
Head Dimensions
The head of the .25-20 screw can be either a hex head or a socket head, depending on the application requirements. The head dimensions are:
- Hex Head:
- Width across flats: 0.312 inches (7.92 mm)
- Width across corners: 0.375 inches (9.53 mm)
- Height: 0.125 inches (3.18 mm)
- Socket Head:
- Width across flats: 0.250 inches (6.35 mm)
- Width across corners: 0.312 inches (7.92 mm)
- Height: 0.125 inches (3.18 mm)
Material and Finish
.25-20 screws are typically made from high-strength materials such as:
- Alloy steel
- Stainless steel
- Titanium
The screws can have various finishes, including:
- Zinc plating
- Cadmium plating
- Passivation
- Anodizing
Uses and Applications
.25-20 screws are used in various industries, including:
- Aerospace: engine mounts, control systems, and structural components
- Defense: weapon systems, ammunition, and armor plating
- Industrial manufacturing: machinery, equipment, and assemblies
The unique dimensions and thread configuration of the .25-20 screw make it an essential component in many applications where high-strength and reliability are critical.
Conclusion
In conclusion, the .25-20 screw is a specialized fastener with unique dimensions and thread configuration. Its high-strength materials and various finishes make it an essential component in many industries. Understanding the detailed dimensions and applications of the .25-20 screw is crucial for designers, engineers, and manufacturers who rely on its performance and reliability.
