Which way to turn bolts?

[hoffdano]

Originally Posted by robbobobbo

Similar here - lefty lug nuts on a 1960's foreign car, and bike pedals. That's it for my encounters with LHT. Both were lefty for reasons of rotational direction. Can't think of why LHT would be used instead of RHT for another reason.

For bike pedals the threads are LH only on one side of the bicycle. That is the left side.

[robbobobbo]

Originally Posted by hoffdano

For bike pedals the threads are LH only on one side of the bicycle. That is the left side.

I know that, thanks. "Bike pedals" in plural because I deal with more than one bike.

But that's a good clarification, before someone starts pounding away on a wrench on the right-hand pedal!

[BookerEast]

Originally Posted by Wilson513

My rule is to see if there is a reason for a left hand thread. Is it on something that is itself turning. I can't imagine why there would ever be a left hand thread if there was not a reason for it. But then I tend to break things.

Agreed. Its also very common for adjusting tension for cable hooks, strut tower tension rods

[Sgt. Buzzcut]

My Ryobi weedeater has a left hand thread, last one I've seen in a while. I'm a big fan of double wrenching, (if there's room). Put the closed end six point 10mm (or whateversize) on the stubborn bolt and put another closed end around the open end of the other wrench and steadily increase pressure. I've not yet broken a bolt head doing this.

[Zea mays]

Originally Posted by robbobobbo

Can't think of why LHT would be used instead of RHT for another reason.

All of the incandescent light bulbs in Chicago's CTA stations have left-handed threads.