What does a bolt designation of 3/8-16 x ¾ indicate?

The bolt designation of 3/8-16 x ¾ conveys specific information about the bolt's size and threading. The portion "3/8" indicates the diameter of the bolt, which is 3/8 of an inch. The "16" signifies that there are 16 threads per inch along the length of the bolt, indicating a coarse thread type. The "¾" refers to the length of the bolt, which is ¾ of an inch long.

Thus, when piecing this information together, the designation tells us that this bolt has a diameter of 3/8 inch, with 16 threads existing for every inch of length, and that the total length of the bolt is ¾ inch. This systematic approach in bolt designations ensures that individuals can easily identify the size and thread count needed for various applications in HVAC and other fields of engineering.