Left hand trhread versus right hand thread

  • Thread starter Thread starter renjith_p
  • Start date Start date
  • Tags Tags
    hand Thread
AI Thread Summary
Left-hand threads provide specific advantages, particularly in applications where rotation can cause unscrewing, such as bicycle pedals and some circular saw blades. They are also used in safety applications, like gas bottles, to distinguish between different types of gases. While left-hand lug nuts were once common in cars like MGs, they are now less frequently used. The discussion highlights the importance of recognizing left-hand threads to avoid issues, such as stripping lug nut studs. Overall, left-hand threads serve crucial roles in various mechanical and safety contexts.
renjith_p
Messages
12
Reaction score
0
Does a left hand thread offer any advantages over a right hand thread?
 
Engineering news on Phys.org
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?
 

Thread 'Query on Isentropic relationships (such as PV^gamma = constant)'

Hi all, I have a question. So from the derivation of the Isentropic process relationship PV^gamma = constant, there is a step dW = PdV, which can only be said for quasi-equilibrium (or reversible) processes. As such I believe PV^gamma = constant (and the family of equations) should not be applicable to just adiabatic processes? Ie, it should be applicable only for adiabatic + reversible = isentropic processes? However, I've seen couple of online notes/books, and...
View full post »

Thread 'Dry sump pump issue'

I have an engine that uses a dry sump oiling system. The oil collection pan has three AN fittings to use for scavenging. Two of the fittings are approximately on the same level, the third is about 1/2 to 3/4 inch higher than the other two. The system ran for years with no problem using a three stage pump (one pressure and two scavenge stages). The two scavenge stages were connected at times to any two of the three AN fittings on the tank. Recently I tried an upgrade to a four stage pump...
View full post »

Similar threads

Tell us about left-right hand coordination when playing musical instruments, especially for Piano
Replies
8
Views
3K
Right handed co-ordinates and Left handed co-ordinates
Replies
8
Views
2K
Can People Be Neither Right Nor Left Handed?
2
Replies
59
Views
6K
I Can you somehow make left handed helix into a right handed?
Replies
8
Views
3K
Is the Valve Knob Screw Left-Hand Threaded?
Replies
4
Views
17K
B Increase in radiation from radium pocket watch hands
Replies
6
Views
2K
Two vectors forming right handed set?
Replies
4
Views
1K
I Calculating the root of a number by hand
Replies
6
Views
2K
Confusion about ##\sqrt{x^2}= \left| x \right|##
Replies
1
Views
2K
Fleming's left and right hand rule - how do they work?
Replies
8
Views
3K

Hot Threads

Recent Insights

Back
Top