Fastener thread sizes are either left or right handed. So what are the differences? Essentra Components have designed this guide to answer that question. The guide will also explain fastener thread ...

The mating screw threads were made using screw-cutting lathes, and these were (and still are) optimised for right-handed users. This meant it was much easier to cut a right-hand thread than a left ...

Q: Why do bicycles have standard right-hand threads on the right pedal, but left-hand threads on the left pedal?A:A lot of people believe this is to prevent the pedals from unscrewing and falling ...

This article was originally published with the title “A Curious Piece of Mechanical Manipulation.--Cutting Right or Left Hand Threads with Right Hand Dies” in Scientific American Magazine Vol ...