.4375-20 Thread Dimensions: Understanding the Specifications
The .4375-20 thread is a type of screw thread commonly used in various engineering and industrial applications. This thread size is part of the Unified Thread Standard (UTS) and is widely used in North America. In this article, we will delve into the dimensions and specifications of the .4375-20 thread.
Thread Diameter and Pitch
The .4375-20 thread has a major diameter of 0.4375 inches (11.11 mm) and a pitch of 20 threads per inch (TPI). This means that the distance between each thread is 0.050 inches (1.27 mm).
Thread Form
The .4375-20 thread has a unified thread form, which means it has a rounded root and a flat crest. The thread form is designed to provide a strong and efficient thread engagement.
Thread Series
The .4375-20 thread is part of the Unified Coarse (UNC) thread series. This series is commonly used for general-purpose applications where a high strength-to-weight ratio is required.
Dimensions
The following table provides the dimensions for the .4375-20 thread:
| Dimension | Value |
|---|---|
| Major Diameter | 0.4375 inches (11.11 mm) |
| Pitch | 20 threads per inch (TPI) |
| Minor Diameter | 0.3844 inches (9.76 mm) |
| Thread Height | 0.0267 inches (0.68 mm) |
| Thread Depth | 0.0531 inches (1.35 mm) |
Tolerances
The tolerances for the .4375-20 thread are as follows:
- Major Diameter: +0.0005 inches (-0.127 mm) to -0.0015 inches (-0.381 mm)
- Pitch: ±0.0015 inches (±0.381 mm)
- Minor Diameter: +0.0015 inches (+0.381 mm) to -0.0005 inches (-0.127 mm)
Applications
The .4375-20 thread is commonly used in various applications, including:
- Automotive industry
- Aerospace industry
- Construction equipment
- Industrial machinery
In conclusion, the .4375-20 thread is a widely used screw thread specification that is essential in various industries. Understanding the dimensions, tolerances, and applications of this thread is crucial for designing and manufacturing efficient and reliable products.
