On the following tap size 1/2 in. -13 UNC-2B , identify thread meaning for 1/2 in.? c. Coarse or Fine f. Internal a. Major diameter b. Number of threads per inch of length e. External d. Class of thread

For the given tap size \( \frac{1}{2} \) in. -13 UNC-2B, let's identify the meaning of each component:<br /><br />1. **\( \frac{1}{2} \) in.**:<br /> - **a. Major diameter**: This indicates the major diameter of the thread, which is \( \frac{1}{2} \) inch.<br /><br />2. **13**:<br /> - **b. Number of threads per inch of length**: This specifies that there are 13 threads per inch.<br /><br />3. **UNC**:<br /> - **C. Coarse or Fine**: "UNC" stands for Unified National Coarse, indicating that it is a coarse thread.<br /><br />4. **2B**:<br /> - **d. Class of thread**: The "2B" designation refers to the class of fit for internal threads. Class 2B is a standard fit for general-purpose applications.<br /><br />5. **Internal vs. External**:<br /> - **f. Internal**: The "B" in "2B" indicates that this is an internal thread (such as a nut or tapped hole).<br /><br />Therefore, the meanings are as follows:<br />- \( \frac{1}{2} \) in.: Major diameter<br />- 13: Number of threads per inch of length<br />- UNC: Coarse thread<br />- 2B: Class of thread (internal)<br />- Internal: Indicated by "B" in "2B"