I heard an interesting anecdote about screw manufacturing. A friend of mine was in china talking to manufacturers there. He asked about standard screw sizes an

I heard an interesting anecdote about screw manufacturing. A friend of mine was in china talking to manufacturers there. He asked about standard screw sizes and was told that there were no standard sizes or "in stock", and he should just tell them what size he wanted because their supplier just makes whatever size screws they need.