Left hand trhread versus right hand thread

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SUMMARY

Left-hand threads provide specific advantages in applications where preventing unscrewing is critical, such as left pedals on bicycles and certain gas bottles. For example, fuel gas bottles utilize left-hand threads for safety, distinguishing them from oxidizer gas bottles that use right-hand threads. Additionally, turnbuckles feature opposite handed threads on either end, enhancing their functionality. While left-hand lug nuts were historically used in some vehicles like MGs, their prevalence has decreased in modern automotive design.

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Mechanical engineers, automotive technicians, bicycle mechanics, and safety professionals in gas handling industries will benefit from this discussion.

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Does a left hand thread offer any advantages over a right hand thread?
 
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Left pedals on most bicycles have left-hand threads to keep the pedal from unscrewing. Some cars (MGs, e.g.) used to have left-hand lug nuts on the left side, but that's not so common anymore. Some circular saw blades are secured with left-hand nuts for a similar reason.

Turnbuckles obviously have opposite handed threads on either end.

Fuel gas bottles have left hand threads & oxidizer gas bottles have right hand threads as a safety measure for welders. That's why the propane tank on your gas grill is left-handed.
 
obafgkmrns said:
Some cars (MGs, e.g.) used to have left-hand lug nuts on the left side, but that's not so common anymore.

When I was a teenager I nearly stripped the lug nut studs on my Mom's '65 Dodge when changing a flat. The nut seem to be getting tighter and a friend watching suggested it might have a left hand thread, which it did.
 
They prevent unscrewing in applications where the screw fixes a rotating object, and also help to differentiate gas from hydraulic/liquid/etc lines in cars, burners, etc.
 
LJW said:
They prevent unscrewing in applications where the screw fixes a rotating object, and also help to differentiate gas from hydraulic/liquid/etc lines in cars, burners, etc.

Are u saying that gas lines are always fitted with left hand theads?
 

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