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 threads In practice, many people encounter this situation:A screw can be threaded in, but no matter how tight it is, it won’t hold properly—or worse, it starts leaking or loosening. The first assumption is often incorrect sizing.However, in many cases, the real issue is: the wrong thread type was used. The most commonly confused types are:Machine Thread and Pipe Thread (often called “pipe thread” on site) Although they may look similar, their design purposes are complet

Screw surface treatments In many industrial applications, the durability of screws is not determined only by material and strength—surface treatment also plays a critical role. For example, a carbon steel screw without any treatment may rust quickly. However, with proper surface treatment, its corrosion resistance can be significantly improved. Different surface treatments vary greatly in corrosion resistance and application environments. Therefore, when selecting screws, sur

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

International Hardware Parts Platforms When designing equipment, repairing machines, or preparing to purchase fasteners and hardware parts, many people don’t start by asking for a quote—they start by searching on international hardware platforms. These platforms are widely used not because you must buy from them, but because they offer clear specifications, well-structured categories, and reliable engineering information. In real purchasing scenarios, however, a common issue

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

Metric and Imperial In hardware parts, machining, and equipment maintenance, it’s common to encounter a confusing situation: you only want to find a screw or a pin, yet the specifications appear in two completely different formats — one written as M4, M6, M8 (metric), and another as 1/4"-20 or #8-32 (imperial). Many people wonder:“Why aren’t these specifications unified?”“Since they look similar, can they substitute for each other?” The answer is: No.Metric and imperial syste

Parallel Key In mechanical transmission and assembly, the parallel key is a small yet crucial component that determines whether parts operate securely. Installed between the shaft and hub (such as gears, pulleys, and couplings), it transmits torque and prevents relative sliding. If the size is chosen incorrectly or installed improperly, it can lead to loosened parts, reduced mechanical precision, or even shaft damage. --- How to Select Parallel Key Size Selection is mainly ba