How to Calculate the Depth of Thread Turning?

[LaSawyer]

Metric thread depth H=1.0825 × pitch (H is the diameter measurement), while imperial thread depth = 25.4/thread count × 1.25. The minor diameter of the thread = diameter × 1.08 × pitch. Below is relevant information about threads: 1. Dimensions: For an M45 thread, the outer diameter should not be turned to exactly 45mm before thread turning because the threading process may cause the outer diameter to expand. This means that after completing the threading process, the major diameter might exceed 45mm, so the finished outer diameter should be slightly less than 45mm. 2. Shapes: Threads are categorized by their cross-sectional shapes (thread forms) into triangular threads, rectangular threads, trapezoidal threads, and buttress threads, among others. Triangular threads are primarily used for fastening (see threaded joints), while rectangular, trapezoidal, and buttress threads are mainly used for power transmission. Threads located on the external surface of a cylinder are called external threads, and those on the internal surface are called internal threads.