Tuesday, Jun 21, 2011 at 21:42
some shafts come with "left hand" threads, simply to maintain a tight nut on it when it rotates, meaning if you hold
the nut and rotate the shaft it will always tighten up, some adjuster screws are left handed and right handed threads on the same shaft in order compress or expand "something", some trucks have a lefthand thread on one side of the wheel studs and right hand on the other side, again so the basic rotation of the wheels being forward at most times assists in keeping them tight.......... some gas fittings are "left handed" to stop us screwing it in
places where it should not be, oxy actelene have lh and rh threads so you cant mix em up, bike pedals are lh and rh so they always tighten up when riding....
If you think about it there are a lot of things around that have em
Noting that you can even buy "left handed" drill bits, the most common purpose is to drill out broken off bolts/studs as when it drills down and happens to loosen the bolt/stud it un-screws it at the same time, using a right handed one will tighten it and can make a small problem become big....
Hope that kinda explains it
Cheers
Joe
FollowupID:
731478