Reviewing the Old to Discover the New-002-When threads merged with automatic control, the entire world began to spin

Thread Content

This post was last edited by wang_qia on 2016-12-28 at 10:52. I. Thread types for fixed connections: 1. Ordinary metric threads (M) 2. Unified female threads (UN) 3. B.S.W., B.S.F., Whit.S., and Whit. threads 4. Mysterious small threads (S) 5. Special aerospace threads (MJ) 6. Female aerospace threads (UNJ). II. Thread types for threaded holes: 1. Special trapezoidal threads (30-degree Tr) 2. Female trapezoidal (AcME) threads (29-degree AcME) 3. Mysterious serrated threads (3-degree/30-degree B) 4. Female and imperial serrated threads (7-degree/45-degree). III. Pipe threads: 1. Imperial pipe threads (55 degrees) 2. American pipe threads (60 degrees) 3. Metric pipe threads (60 degrees). IV. Appendix: 1. Inspection system for UN, uNR, uNJ, M, and MJ threads 2. Series of gauge needle diameters 3. Thread identification table. V. Back cover: Automatic control instruments