I know that there are screws with these features and know how to distinguish them. Usually there are screws on the right thread.
When and what type of screws should I use?
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1Generally speaking, every screw you will encounter or should use in a "household" context will be RH threaded. I've only used LH screws in automotive/bicycle/industrial machinery type situations.– whatsisnameNov 6, 2013 at 17:32
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Perhaps you could describe the application for which you would consider a LH thread?– Chris CudmoreNov 6, 2013 at 18:54
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3 Answers
Differences:
- Righty Tighty, Lefty loosey doesn't work with left-handed screws.
- Right-handed screws move away from you if you rotate them in a clockwise direction, whereas left-handed screws move towards you.
When to Use Left-Handed Screws
When fretting induced precession would cause the right-handed nut/screw to loosen, a left handed nut/screw should be used.
answered Nov 6, 2013 at 17:25
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Chrysler products used LH lug nuts for years, but only on the left side of the vehicle– HerrBagNov 6, 2013 at 17:48
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I read of a large transit system (NYC?) that had LHT sockets and light-bulbs to deter bulb theft. They were a huge customer, and it only needed a production line change in the pressed metal in the socket and bulb base.– DJohnMNov 6, 2013 at 19:00
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1I've found that sometimes the right hand (on the wrench) doesn't know what the left hand (thread) is doing.– macNov 7, 2013 at 14:21
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@HerrBag - It was all fun and games sitting back snickering with my buddy at one of our less informed friends trying to remove a flat until he put a swede on it and managed to twist the stud off. Dodge'm Feb 20, 2016 at 3:26
Most common use is probably on a turn buckle. Think screen door sagging fix.
you can easily distinguish right hand and left hand thread by visualize it.and it is depend on your need that what type of screw you can use for which purpose.
