Thread Classes 2A / 3A and 55° vs 60° Thread Angles When selecting screws, many people first look at size, material, or head type.However, in industrial equipment and precision mechanisms, the factors that truly affect fit quality and service life are often more subtle technical details: Thread Class Thread Angle These parameters determine the precision of the fit between the screw and the threaded hole, the clearance between threads, and the stability under vibration or load

thread types When choosing screws, many people only look at size and head type. However, in industrial equipment, what truly affects stability and service life is the thread type. Among all thread designs, Machine Threads are the most fundamental type used in industrial equipment. This is because industrial machinery requires precise mating and repeated assembly, not a one-time bite into the material. --- 1. What Is a Machine Thread? A Machine Thread refers to a standard thr