The Essential Beginner’s Guide to Global Fastener Standards The reason hardware parts can be used, replaced, and serviced across machines worldwide comes down to one thing: standards. There are many standards in the world, but in fasteners and mechanical parts, you’ll most often run into these four: ISO, JIS, DIN, and ASME. This article will walk you through the origin, differences, and use cases of these four major standards in a clear and practical way, so that choosing, pu

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 systems differ in units,