In practice, many people have encountered this situation: A screw looks about the same size, but it just won’t go in — or it gets stuck halfway. Most people first suspect size or tolerance issues.However, in most cases, the real problem is: the thread system is different. --- 1. What Are JIS and ANSI / ASME Thread Systems? In screw design, the whole world does not use the same standard. The two most common systems today come from different countries: JIS (Japanese Industrial

Screw You use screws every single day — you just don’t notice them. They’re inside your phone, furniture, motorcycles, cars, computers, door locks, home appliances, factory machines, medical instruments…Small as they are, without screws, the world simply cannot be assembled, cannot operate, and cannot be repaired. This article will help you understand screws quickly — their functions, materials, and where they are used. --- 1. What is a screw and why is it important? A screw