A screw thread measuring bore head is a specialized type of bore head for when you need to measure the threads on a screw. Whenever you have one part that needs to be screwed into another it can be very useful to be able to check the measurements on the threads. Using this specialized tool will ensure that the two parts will fit together properly. The screw thread measuring bore head can measure effective diameter, pitch diameter, major diameters, and between M4-300mm and 8UN-12” diameter. Knowing the thread width, as well as the screw diameter is important in determining whether a fit will be loose or snug. Whether utilizing U drive screws, wood screws, round heads, or flat heads, you will want to use a screw thread measuring bore head to calculate the distance between threads.