Left hand threads thread- Where & On what have you found them?

creativecars · Nov 30, 2017

I bring up this thread because I was changing out a flipper handle on a toilet this morning and didn't realize it had left hand threads until after I destroyed the plastic threads.
It was a good thing they were plastic because I would have hated to break the tank being ignorant.

Anyway my question to you is where and on what have you found left hand threads?

Toilet- flush lever
Bicycles- left pedal
Some old Chrysler- wheel studs

EOC_Jason · Nov 30, 2017

Air compressor flywheel
Bench Grinder on one side...

DakotaMan · Nov 30, 2017

Draincock on radiator

Catfishdan · Nov 30, 2017

Arbor on my miter saw.

Merch1 · Nov 30, 2017

60s Valiant wheel lugs

joe_padavano · Nov 30, 2017

The toilet handle used LH threads to prevent having the nut loosen up every time you flush the toilet. This is usually why LH threads are used, so a little common sense goes a long way before the need to get destructive.

GM cars prior to the 1963 model year used LH lugs on the LH side of the car. Even the front spindle nut is LH thread. Many have been broken by gorillas in tire stores.

larry_g · Nov 30, 2017

Lead screws on a lot of machines.
Some arbors.
Rod ends
Left handed drill bits.
Many adjustable links, such as the third link on a 3-point hitch.
A Yankee screwdriver has both.

lg
no neat sig line

texasprd · Nov 30, 2017

5.9 Cummins fan clutch in Dodge 2500/3500 - the 36mm nut that attaches the clutch to the pulley/bearing hub

stikman56 · Nov 30, 2017

Powerstroke fan clutch, idler pulley on a Detroit series 60, left side wheel on an older mopar, left side wheel on a Willys pickup, screw on a drill chuck, bunch of other stuff I'm sure that I have forgotten.....

Unhdsm · Nov 30, 2017

I can’t believe no one mentioned lawn mower blades.
Also one end of a dual motor spa pump.

PWC Repair · Nov 30, 2017

Old camper wheel lugs, flywheels on powersports, boat props, jet pumps, various power drive equipment, etc.

finn · Nov 30, 2017

Right side wheel lugs on an F600, some serpentine tensioners.

Generally I check anything that rotates, prior to fitting a wrench to it, for oddball threads. I’ve been surprised enough times in the past that checking threads is sop.

Tucko · Nov 30, 2017

Found them on my propane tank, as I was unhooking my soldering oven....

ER70S-2 · Nov 30, 2017

Water lines on liquid cooled TIG torch.

wayne55 · Nov 30, 2017

Drill chucks if not already mentioned.

ssdave · Nov 30, 2017

Bicycle crank on one side. Acetylene fuel gas fittings. many motor or pully applications as mentioned before.

pancho400cid · Nov 30, 2017

There once was a whale named Moby ****,
who was cursed at birth with a cork-screw *****.
In every ocean he did hunt,
to find a whale with a cork-screw c _ _ t.
At last he found her, but he soon dropped dead…

Son-of-a-*****!!!

Left-hand thread!!!

Bluedodge · Nov 30, 2017

Drill chucks, one side of any bench grinder, nut on my mitre saw.

I had an old 60's Plymouth that had left handed threads on passenger side (?) lug nuts. That was a learning experience - had never heard of such a thing as I pulled and pulled on the lug wrench....

Big Bad Dad · Nov 30, 2017

My 1937 International truck has them on the driver side. As do both of my 1960's Mopar muscle cars.

vavet · Nov 30, 2017

table saw arbor
fan clutch on BMWs
lug nuts on military 5-ton trucks

theoldwizard1 · Nov 30, 2017

Merch1 said:
60s Valiant wheel lugs

All 60s (70s?) Chrysler products. Not sure when they changed.

theoldwizard1 · Nov 30, 2017

Tucko said:
Found them on my propane tank, as I was unhooking my soldering oven....

Only the small male one. The big female is right hand.

theoldwizard1 · Nov 30, 2017

Small drum sander (for a hand drill) rubber arbor.

Ctkelly · Nov 30, 2017

Bunch of parts at work on a rotary liner. Since it rotates counter clockwise that means quite a few of the parts have to have left hand threads.

RPH · Nov 30, 2017

1970’s Husqvarna motorcycles on the primary sprocket. Brother had the corner garage use the impact on it when it wouldn’t come off. Then he learned about left hand threads.

Bogdan M. · Nov 30, 2017

BMW M54 Double Vanos Torx bolts
BMW N47 oil pump bolt
BMW Viscous Coupling Fans

exranger06 · Nov 30, 2017

Single stage snowblower- the pulley on the auger is left hand thread.

ER70S-2 · Nov 30, 2017

Ring gear bolts on late model GM differentials (G8, GTO, Camaro, and probably others).

coljar · Nov 30, 2017

Several years ago, I made a front spring puller for my classic Mini. I needed a lenght of left hand metric threaded rod and believe it or not, a mom & pop fastener outfit in the town across the river had what I needed. I don't figure I'll ever find a use for the last 20inch piece.

landrover bodger · Nov 30, 2017

land rover fan to pulley . left wheels on old trucks . bycicle left pedals

Steve.S · Nov 30, 2017

Two of the four propeller mounts on a quadcopter.

four.cycle · Nov 30, 2017

The nut on the left-hand side of my "Powr-Kraft" grinding arbor.

Crankshaft snout on the Briggs & Stratton 5S engine on my 1955 Toro "Sportlawn" mower.

Crankshaft snout on a Jonsereds chainsaw. Unfortunately the guy at the shop didn't know that it was left-hand thread and snapped off the end of the crank trying to remove the flywheel with an impact gun. Trashed a perfectly good saw.

The business end of a FS80 Stihl weed-whacker uses an 8mm x 1.25 x 40mm left-hand thread bolt (Grade 8, no less) to hold the cutting device onto the hub. When you drop it in the tall grass and lose it it's $9.62 + shipping and lead time is two weeks.

Lotek · Nov 30, 2017

Radiator cap on 17 D-max...the propellerheads out did themselves on that one...the question is "Why?"

Mikeske · Nov 30, 2017

Merch1 said:
60s Valiant wheel lugs

Almost all Chrysler products without disc brakes on the left hand side wheels from the mid 1950's to 1970's

Lelandwelds · Nov 30, 2017

Turnbuckles and heim rod ends.

38Chevy454 · Nov 30, 2017

The fan clutch large nut that holds the fan clutch to the water pump on the Ford 6.9 and 7.3 IDI diesels.

WhiffySpark · Nov 30, 2017

Lotek said:
Radiator cap on 17 D-max...the propellerheads out did themselves on that one...the question is "Why?"

Wow

I suspect a few cracked caps or bottles :lol:

MadMark · Nov 30, 2017

pancho400cid said:
There once was a whale named Moby ****,
who was cursed at birth with a cork-screw *****.
In every ocean he did hunt,
to find a whale with a cork-screw c _ _ t.
At last he found her, but he soon dropped dead…

Son-of-a-*****!!!

Left-hand thread!!!

that made my day

PassnThru · Nov 30, 2017

A common theme is anything heavy that turns on a shaft. It depends on which way the shaft is turning.
The oddest place I have found left hand threads is on this - yes, the orange cap where you put the water in. It gets the kids every time :bounce:

Larey · Nov 30, 2017

One end of pitch links on helicopters or tilt-rotor aircraft. Sorry just sounds better then the already mentioned rod ends.

Left hand threads thread- Where & On what have you found them?

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