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Old 10-13-08, 11:52 AM   #1
j mendivil
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Left hand thread trivia challenge

We all know the common examples of where left hand threads are found:

On bicycles, left hand threads are used mainly in three places, on left pedals, right bottom bracket (BB) bearing cups, and freewheel cones ... Jobst Brandt as on Sheldon's site.

I would like to learn of any others such as UST threaded eyelets and so on...

Thank you all!
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Old 10-13-08, 11:59 AM   #2
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Track lock rings? More?
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Old 10-13-08, 12:06 PM   #3
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The bearing cup inside Shimano freehubs.
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Old 10-13-08, 02:04 PM   #4
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The hose hook up and regulator conection on Ox-Acy torch.
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Old 10-13-08, 02:18 PM   #5
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The lug nuts on 1950s Chrysler products, on the driver's side, were left-hand threads.
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Old 10-13-08, 02:21 PM   #6
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On turnbuckles on sail boats.
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Old 10-13-08, 02:25 PM   #7
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Cool answers. I was looking for bike stuff, arguably the torch is... These are fun though!
How about outboard end of lathe for turning bowls?
And weed-eater nut for holding the spool on?
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Old 10-13-08, 02:37 PM   #8
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Usually it's the one that I just stripped the hex off from trying to undo it the wrong way.....
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Old 10-13-08, 02:43 PM   #9
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Quote:
Originally Posted by j mendivil View Post
We all know the common examples of where left hand threads are found:

On bicycles, left hand threads are used mainly in three places, on left pedals, right bottom bracket (BB) bearing cups, and freewheel cones ... Jobst Brandt as on Sheldon's site.

I would like to learn of any others such as UST threaded eyelets and so on...

Thank you all!
Power saw blade attachment nuts or screws. You don't what them backing out
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Old 10-13-08, 03:04 PM   #10
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Saab belt tensioner pulley bolt. Ask me how I know NOW that its left hand threaded. Left hand thread stuff should be prominently marked as left hand threaded!
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Old 10-13-08, 03:28 PM   #11
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Most hot water faucet stems.
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Old 10-13-08, 03:51 PM   #12
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The little knob on the end of horizontal dropout adjustment screws.

The cover plate (or whatever you call it; I only mess with them when destructively removing a FW) on old freewheels.

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Old 10-13-08, 04:17 PM   #13
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What about those fishing reels with the bails on them, doesn't either the spool or the plastic keeper have left hand threads?
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Old 10-13-08, 05:04 PM   #14
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BMW fan pulley nuts are LH threaded.
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Old 10-13-08, 05:13 PM   #15
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Quote:
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The lug nuts on 1950s Chrysler products, on the driver's side, were left-hand threads.
Earlier than that, too. My '49 DeSoto had 'em.
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Old 10-13-08, 05:14 PM   #16
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The nuts/sockets to tighten bar end shifters to handle bars. Roger
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Old 10-13-08, 05:36 PM   #17
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Here's a useful bit of related trivia:

Check out your left pedal. Most of the time the spindle will be knerled or marked in some similar manner. Left hand threaded parts are commonly, but not always so marked.
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Old 10-13-08, 06:11 PM   #18
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My 1965 MGB had a LH thread on the right side knock-off hubcaps.
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Old 10-13-08, 08:24 PM   #19
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The nuts/sockets to tighten bar end shifters to handle bars. Roger
Nope. These are right-hand thread. However, since they're accessed from the "bottom" end and not the "head" end, you turn the wrench opposite the "normal" direction. I have to re-teach myself this every time I work on bar-cons.
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Old 10-13-08, 09:58 PM   #20
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Quote:
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The lug nuts on 1950s Chrysler products, on the driver's side, were left-hand threads.
Even more recent than that.
When I was a kid I owned a 1970 Barracuda.
The first time I had a flat tire, I snapped off two lug bolts before I figured out what was happening.
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Old 10-14-08, 02:09 AM   #21
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Quote:
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The nuts/sockets to tighten bar end shifters to handle bars. Roger
Nope. These are right-hand thread. However, since they're accessed from the "bottom" end and not the "head" end, you turn the wrench opposite the "normal" direction. I have to re-teach myself this every time I work on bar-cons.
Simple way to remember this is the "right-hand rule". Imagine wrapping your hand around the fastener with your thumb pointing in the direction you want it to move. Your fingers would indicate the direction of twist needed. Also handy for figuring out direction of current-flow when a wire passes through a magnetic field.
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Old 10-14-08, 04:38 AM   #22
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The cone and nut on an one piece crank on the left side.
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Old 12-10-11, 12:13 PM   #23
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My 1980 era Shimano bar end shifters, the bolts that tighten the swedges inside the bar end. CC to tighten. I always must relearn every 5 - 10 years when replacing tape.
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Old 12-10-11, 12:17 PM   #24
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I would like to learn of any others such as UST threaded eyelets and so on...
Campagnolo first generation right ergo lever main pivot shaft.
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Old 12-10-11, 12:17 PM   #25
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The lug nuts on 1950s Chrysler products, on the driver's side, were left-hand threads.
So did my 1940 Plymouth.
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