UNF Thread Dimensions: A Comprehensive Guide
The UNF (Unified National Fine) thread is a widely used thread standard in the United States and Canada. It is commonly used for precision applications, such as in aerospace, automotive, and industrial settings. In this article, we will provide a detailed guide to UNF thread dimensions from 1-20.
UNF Thread Dimensions Chart
The following chart lists the UNF thread dimensions from 1-20:
1-10 UNF Thread Dimensions
| Thread Size | Major Diameter | Pitch | Minor Diameter | Thread Length |
|---|---|---|---|---|
| UNF 1 | 0.0730 | 64 | 0.0530 | 0.20 |
| UNF 2 | 0.0860 | 56 | 0.0660 | 0.25 |
| UNF 3 | 0.0990 | 48 | 0.0790 | 0.30 |
| UNF 4 | 0.1120 | 40 | 0.0920 | 0.35 |
| UNF 5 | 0.1250 | 32 | 0.1050 | 0.40 |
| UNF 6 | 0.1380 | 24 | 0.1180 | 0.45 |
| UNF 8 | 0.1640 | 20 | 0.1440 | 0.50 |
| UNF 10 | 0.1900 | 16 | 0.1700 | 0.55 |
11-20 UNF Thread Dimensions
| Thread Size | Major Diameter | Pitch | Minor Diameter | Thread Length |
|---|---|---|---|---|
| UNF 12 | 0.2160 | 14 | 0.1960 | 0.60 |
| UNF 14 | 0.2420 | 12 | 0.2220 | 0.65 |
| UNF 16 | 0.2680 | 10 | 0.2480 | 0.70 |
| UNF 18 | 0.2940 | 9 | 0.2740 | 0.75 |
| UNF 20 | 0.3200 | 8 | 0.3000 | 0.80 |
Thread Identification
To identify a UNF thread, you can use the following formula:
Thread Size = Major Diameter x Pitch
For example, a UNF 10 thread has a major diameter of 0.1900 inches and a pitch of 16 threads per inch. Therefore, the thread size can be calculated as:
Thread Size = 0.1900 x 16 = 3.04
Conclusion
In this article, we have provided a comprehensive guide to UNF thread dimensions from 1-20. The chart provides the major diameter, pitch, minor diameter, and thread length for each thread size. Understanding UNF thread dimensions is crucial for selecting the correct thread for your application. By using the thread identification formula, you can easily identify UNF threads and ensure accurate thread engagement.
