Comprehensive Thread Standards: A Practical Guide
UNC: Unified Coarse Thread 5/16: Nominal Size of the Thread, in Inches 18: Pitch of 1/18, which means 18 threads per inch 3A: Tolerance Grade, Level 3, External Thread (B is for Internal Thread) R.H: Right-Handed What Are the Differences Between Unified Threads and Metric Threads? Metric threads are indicated by pitch, while Unified and … Read more