Reverse thread screws

Submitted: Tuesday, Jun 21, 2011 at 19:12
ThreadID: 87116 Views:4731 Replies:11 FollowUps:29
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A bit of a strange request, but the power of the forum is not to be underestimated.
I have been trying to source a reverse thread screw for the past 7 weeks with no success. I've tried about 5 Australian specialist shops/distributors and even overseas companies.
What I'm looking for is;
50mm/2 inch
8 gauge
reverse thread
Phillips head slot
self tapper
stainless steel (if possible)

Any leads or suggestions would be greatly appreciated.
Thanks
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Reply By: racinrob - Tuesday, Jun 21, 2011 at 19:31

Tuesday, Jun 21, 2011 at 19:31
As a retired purchasing officer for a mechanical maintenance company who used unusual 316 stainless steel items like you mention I found I would often have to have them specially made, again not easy but call some engineering shops and ask them and if not can they point you in the right direction.
I've gotta ask, what's it for and can't the manufacturer of the equipment it's for supply it ???

rr
AnswerID: 458105

Reply By: Member - Joe n Mel n kids (FNQ - Tuesday, Jun 21, 2011 at 19:31

Tuesday, Jun 21, 2011 at 19:31
can i ask what it is for, only reason for that is i am assuming it is "left hand threaded" .... and i have worked on some remote locations, boats ect that has required me to improvise and rather than find the LH thread i have made changes to suit other threads ...
Cheers
Joe
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Follow Up By: Bigfish - Tuesday, Jun 21, 2011 at 20:17

Tuesday, Jun 21, 2011 at 20:17
Dont mind showing my ignorance but why would a left hand thread be manufactured?
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Follow Up By: Member - Joe n Mel n kids (FNQ - Tuesday, Jun 21, 2011 at 21:42

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
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Follow Up By: Member - Murray R (VIC) - Tuesday, Jun 21, 2011 at 22:06

Tuesday, Jun 21, 2011 at 22:06
Big fish
Early model Valiants had left hand thread wheel studs on one side, can't remember which side.
Murray
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Follow Up By: Member - Pedro the One - Tuesday, Jun 21, 2011 at 22:46

Tuesday, Jun 21, 2011 at 22:46
Yep - reasonably common item, but mainly used in 'specialist' applications :
gas bottle threads, bicycle pedals, motors where cables are attached via yokes which may vibrate loose, turn-buckles which have both a LH and RH end. etc....

Generally would need to be 'manufactured' to an order ......... unless you can find some hidden on the WWW !!

Had occasion to get some LH nuts, years ago ...... had to call in a 'favour' to get them made.




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Follow Up By: Bigfish - Wednesday, Jun 22, 2011 at 07:17

Wednesday, Jun 22, 2011 at 07:17
Thanks folks...Now that you mention it I do remember the push bike pedals left hand thread... Been many a year since using one though!
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Follow Up By: landed eagle - Wednesday, Jun 22, 2011 at 19:39

Wednesday, Jun 22, 2011 at 19:39
LH threads on some early model econovan/mazda variants too.Driver's side wheels I think?????
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Reply By: braggy - Tuesday, Jun 21, 2011 at 20:21

Tuesday, Jun 21, 2011 at 20:21
I want to know as well, what would you need a l\h thread self taper for, could only think for left handed screwdriver on the skyhook.


Cheers Ken
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Follow Up By: Member - Josh- Tuesday, Jun 21, 2011 at 22:17

Tuesday, Jun 21, 2011 at 22:17
If you find one braggy can you ask if they have any stripped paint in stock lol.
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Follow Up By: Paul V1 - Wednesday, Jun 22, 2011 at 02:24

Wednesday, Jun 22, 2011 at 02:24
Right next to the long weight
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Reply By: Member - Jack - Tuesday, Jun 21, 2011 at 21:51

Tuesday, Jun 21, 2011 at 21:51
Would I be right in saying they are (or were) called "Easy-Outs"?

Jack
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Follow Up By: Paul V1 - Wednesday, Jun 22, 2011 at 02:11

Wednesday, Jun 22, 2011 at 02:11
spot on, bit more info from the poster as to the application.
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Follow Up By: Doomadgee Roadhouse - Wednesday, Jun 22, 2011 at 17:43

Wednesday, Jun 22, 2011 at 17:43
"easy-out" is what you use after the hole is drilled, yep it is "left handed" and you can match it with a LH drill bit..
Cheers
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Reply By: Member Al (Sunshine Coast) - Tuesday, Jun 21, 2011 at 23:38

Tuesday, Jun 21, 2011 at 23:38
Strange request indeed! Blowed if I know why one would need a 'reverse' or presumably a left-hand self-tapping screw. I'm fascinated.

However a Google search revealed one such screw here, sixth line down. But even weirder this site has such screws for insertion into craniums!!! I'm afraid to search further!

Cheers
Allan

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Follow Up By: Paul V1 - Wednesday, Jun 22, 2011 at 02:18

Wednesday, Jun 22, 2011 at 02:18
2 inch with phillips head reverse, could be having a lend.
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Follow Up By: dogblue - Wednesday, Jun 22, 2011 at 07:16

Wednesday, Jun 22, 2011 at 07:16
Don't forget the box of spot welds.
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Follow Up By: Member - Boo Boo (NSW) - Wednesday, Jun 22, 2011 at 13:36

Wednesday, Jun 22, 2011 at 13:36
Al

I think I have one of those screws in my skull.

It is is there to hold my Bone Anchored Hearing Aid.

I wouldn't recommend the operation to anyone though,,, the skin graph didn't take very well and a blow fly laid eggs under the flap and My wife pulled out 33 maggots one day. LOL





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Follow Up By: Member Al (Sunshine Coast) - Wednesday, Jun 22, 2011 at 13:56

Wednesday, Jun 22, 2011 at 13:56
What Boo Boo?

A......
"50mm/2 inch
8 gauge
reverse thread
Phillips head slot
self tapper"

That's one helluva hearing aid you got! LOL

Cheers
Allan

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Follow Up By: Member - Boo Boo (NSW) - Thursday, Jun 23, 2011 at 13:31

Thursday, Jun 23, 2011 at 13:31
Al ya bloody smart ass.

I heard you typing your response before I read it. LOL
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Reply By: workhorse - Wednesday, Jun 22, 2011 at 07:24

Wednesday, Jun 22, 2011 at 07:24
Thanks for the replies.
The reason I need the screw, and yes it is true,is for an automatic coffee machine I bought.
It holds the top of the coffee bean grinder, and works as suggested in not becoming loose as the grinder turns.
A green bean (not roasted and as hard as a rock) was in the beans and this jammed the grinder. Thinking it a quick fix I went to remove it but only after damaging the head did I realise the screw was reverse thread.
So the big problem is the supplier regards my damaging the screw as voiding the warranty and wont help me with the bigger real problem of a damaged grinder.
I've been trying for quite some time and have tried alternative suppliers, one who wanted to charge me $79 for one screw. Looks like I'm screwed on this and now have a non functioning machine due to one screw! AGH!
Any help still appreciated.
Michael
AnswerID: 458136

Follow Up By: Member - Craig F (WA) - Wednesday, Jun 22, 2011 at 08:17

Wednesday, Jun 22, 2011 at 08:17
Do you have the original screw? If so can you TIG weld the head of the screw then slot to suit a flat head screwdriver (left handed of course)

Craig
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Follow Up By: oz doc - Wednesday, Jun 22, 2011 at 08:38

Wednesday, Jun 22, 2011 at 08:38
Hi Workhorse, so what brand of machine are we talking about here? Is it the "burr screw" you are after?doc.
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Follow Up By: glids - Wednesday, Jun 22, 2011 at 10:24

Wednesday, Jun 22, 2011 at 10:24
I was going to suggest cutting a slot for a flat blade screwdriver, as well. It may not be necessary to TIG weld the head first, but welding up the damaged philips socket would probably be better.

glids
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Follow Up By: Member Al (Sunshine Coast) - Wednesday, Jun 22, 2011 at 12:05

Wednesday, Jun 22, 2011 at 12:05
Cutting a slot for a flat blade screwdriver is good but sometimes difficult if the screw head is hardened. An alternative (if not a countersunk screw) is to grind a pair of flats on the sides of the screw head and use an appropriate wrench.

Cheers
Allan

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Reply By: Member - allan t (NT) - Wednesday, Jun 22, 2011 at 14:06

Wednesday, Jun 22, 2011 at 14:06
WORKHORSE
WHY NOT DRILL OUT AND PUT A R/H THREAD IN WITH LOCKTITE WILL DO THE JOB MUCH CHEAPER
ALLAN
AnswerID: 458150

Reply By: workhorse - Wednesday, Jun 22, 2011 at 17:02

Wednesday, Jun 22, 2011 at 17:02
Thanks again for the replies.
Ok, the full story.
The screw was damaged by me in trying to remove a green (unroasted coffee bean) that had got into the inbuilt grinder. I damaged it because I didn't think it would be a reverse thread screw. So I thought remove the bean and all ok. Problem is that there is a bigger issue with the grinder and whilst the machine is under warranty, because I have damaged the screw head I have technically interfered with the machine components and if I return the machine for the larger warranty issue they will reject it. So for a screw my machine is sitting there.
The machine is a fully automatic one and the screw needed is an anomaly not seen in most machines.
Keep up the replies, I've had more interest here than with my supplier.
Michael
AnswerID: 458167

Follow Up By: Member - Bruce C (NSW) - Wednesday, Jun 22, 2011 at 17:16

Wednesday, Jun 22, 2011 at 17:16
Hi Workhorse,

Why not just drop the screw into the inside and send it in for a warranty claim.
This way they can find that the screw came loose and damaged something inside.

Try and put some marks on the head of the screw to indicate it may have gotten mixed up with the workings.

Or have you made advances and informed them of your investigations in this regard.

Just a thought.

Cheers, Bruce
At home and at ease on a track that I know not and
restless and lost on a track that I know. HL.

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Follow Up By: Member Al (Sunshine Coast) - Wednesday, Jun 22, 2011 at 18:26

Wednesday, Jun 22, 2011 at 18:26
Remind me not to sell you anything with warranty cover Bruce!
Cheers
Allan

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Follow Up By: workhorse - Wednesday, Jun 22, 2011 at 18:34

Wednesday, Jun 22, 2011 at 18:34
Thanks Bruce.
I was trying to save the bloke money by removing the bean myself and ended up shooting myself in the foot.
Should follow the rule some people adhere to and not go out of my way to help anyone. (sic) Not suggesting you're suggesting that.
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Follow Up By: Member - Bruce C (NSW) - Thursday, Jun 23, 2011 at 10:08

Thursday, Jun 23, 2011 at 10:08
Hi Allan,
They should not have denied a warranty claim outright, they should have been more helpful. After all it is their reputation at stake. A simple examination of the item will more than likely point to the cause irrespective of a damaged screw head.


Workhorse,
Know what you mean about helping out and getting caught out. I have done that many times.

But it won't stop us from helping in the future will it.
We can't help it. It is in our nature.

Cheers, Bruce.
At home and at ease on a track that I know not and
restless and lost on a track that I know. HL.

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Reply By: Michael ( Moss Vale NSW) - Wednesday, Jun 22, 2011 at 17:49

Wednesday, Jun 22, 2011 at 17:49
This sounds like a simple remedy, why not buy the screw as a spare part from the manufacturer or agent..if its fairly new they must supply parts for it.. Thats what i would do,, and replace the screw and all is well.... Michael
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Follow Up By: workhorse - Wednesday, Jun 22, 2011 at 17:59

Wednesday, Jun 22, 2011 at 17:59
I've been emailing Australian distributors/suppliers, overseas manufacturers and 7 of the distributors of these machines in Australia.
I got one positive from a supplier of the same machine but not who I bought it from and he wanted to charge me $79 for one screw.
I'm at my wits end so that's why I posted it here on 4wd forum.
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Follow Up By: kev.h - Wednesday, Jun 22, 2011 at 18:34

Wednesday, Jun 22, 2011 at 18:34
Can you get the thread out for a sample if so I could make you one also can you take a photo of the burr and email me i may be ableto do something
email kev dot h at bigpond dot com
Cheers Kev
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Follow Up By: workhorse - Wednesday, Jun 22, 2011 at 19:15

Wednesday, Jun 22, 2011 at 19:15
Hey kev.h that's the best news I've heard for a while.
I can send you the screw if you want.
I'll email you.
Thanks,
Michael
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Follow Up By: Gobumpy - Wednesday, Jun 22, 2011 at 19:16

Wednesday, Jun 22, 2011 at 19:16
Gday mate

Been pondering your post all day being a diesel mechanic for a large construction company I come across alot of weird and wonderful items but the only thing I can think of is the small screw inside the chuck on an electric drill I changed one today and it was a small left hand thread screw if thats not what your after try an electronics place or supplier not sure what state you in but try these places I have used here in WA for different bits n bobs. RS components, MM electrical ERW electrical maybe even jaycar. hope ive helped if ya need more info please ask.

Scott n Lara
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Follow Up By: workhorse - Wednesday, Jun 22, 2011 at 20:45

Wednesday, Jun 22, 2011 at 20:45
Thanks Scott n Lara.
Sent off some emails and will call them tomorrow.
Grateful for the help.

Thanks again.
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Reply By: Member - Vince M (NSW) - Thursday, Jun 23, 2011 at 13:42

Thursday, Jun 23, 2011 at 13:42
Tower fasteners in Sydney (southern sub?) have supplied me all sorts of strange stainless nuts & bolts & use to make me S/steel spoke nuts (for wire wheels) at reasonable price give them a try if you can,t find them in the yellow pages give me a msg & when i get to work I,ll look it up
good luck
Regards Vince
AnswerID: 458239

Reply By: workhorse - Thursday, Jun 23, 2011 at 18:07

Thursday, Jun 23, 2011 at 18:07
Thanks I'll try.
I have to say every lead I've been given by you good folk has unfortunately not turned into a success yet.
Thanks
AnswerID: 458262

Follow Up By: aka_db - Thursday, Jun 23, 2011 at 19:32

Thursday, Jun 23, 2011 at 19:32
Hi Workhorse,

I know it's not the right thing to do but given the lack of assistance by the company you purchased from....

Could get someone to buy a new one the same as the original and return it shortly after for a refund due to a screw that was found to be missing... provided of course the missing screw fell out in an anti clockwise direction and therefor was not damaged in the process :)

Could then miraculously find a screw to put back in to your broken grinder to allow you to return it for the necessary warranty repair?

Cheers, good luck. db..
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