A lawn mower blade is agood example, and by looking at the physics, it will becomeobvious.Ī lot of blades on lawn mowers attach to the shaft of the motorwith a nut or a bolt. We'd have tohave a reason to make 'backwards' threads on a fastener, wouldn'twe? We do, and most applications where we see left-hand threadedfasteners involve attaching rotating parts.
We make left hand fasteners for special purposes. With left-hand fastenersjust the opposite is true when tightening them or looseningthem. These fasteners are turned counter-clockwise toloosen them, as you might have guessed. (This is true for a nut, and for a bolt, you'd be looking atthe head with the threads away from you.) These are right-handthreaded fasteners.
Most fasteners with threads are turned clockwise to tightenthem. But you would be ok to call the part you are describing a turnbuckle. What is the technical name of threaded rod with left and right hand threads? The plumbing fitting that consists of a left & right hand threaded nipple and a left & right hand threaded coupler is simply called a left-right union. Mechanical Engineering / Mechanics / The Difference Between
