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Am I looking for a "threaded insert"?

Am I looking for a "threaded insert"?

Am I looking for a "threaded insert"?

(OP)
Hello,

I am looking for something quite like a threaded insert, but threaded on both sides.
In other words, I could take this part and attach it the same way I would a nut and a bolt, but the end result would be a hole for a smaller bolt to fit inside.

Am I making myself clear at all?  Does this sound like something you would still call a threaded insert?  If not, what is it?  Does anyone know a good supplier?

Thanks so much.

Cheers,
   DHD

RE: Am I looking for a "threaded insert"?

Maybe search www.mcmaster.com for coupling nuts.

RE: Am I looking for a "threaded insert"?

Well...a Helicoil is threaded on both sides (funky threads on the o.d., special taps required).  Some plastic inserts and wood inserts are threaded on both sides (cutting threads on o.d.)...  

Threaded pipe bushings are threaded on both sides...

I'm guessing you want something with machine (straight) threads on both sides, in a solid insert...

Keenserts have an o.d. thread, with knock-down locking "keys", similar products without keys but with threadlocking compound on them exist too.  Both of which can be found by typing "threaded insert" into the search blank on www.mcmaster.com.

RE: Am I looking for a "threaded insert"?

what sizes?

RE: Am I looking for a "threaded insert"?

(OP)
I think I am looking for something closer to a 'thread reducer'.

Want machine threading on both the inner and outer surfaces.

I'd saying something like 10-32 inner and whatever size the o.d. has to be to make that i.d. threading work.

Ideally, it would have a flange so it could be passed through a hole ( not tapped, straight ), and fastened with a standard nut on the opposite side.  Then, I would end up threading an eye-bolt through into the internal threading on one side or the other.

DHD

RE: Am I looking for a "threaded insert"?

Why not just drill and tap a standard bolt?

RE: Am I looking for a "threaded insert"?

(OP)
Well,

That's the other part of the story.
I'll take a step back.

I am starting with 1/4" ABS.
My end goal is to have an eye-bolt ( say 10-32 ) protruding from the "top" side of the ABS.  Whatever hardware is on the other side needs to be flush ( a slight flange is fine ).

The side with the eye-bolt needs to be "clean" looking.  Just the loop of the eye-bolt, and possibly a nut to lock it down.

Was thinking a typical threaded insert, with knife-threads on the outside, would work.  They don't seem to come in 1/4" length, however.

Any other ideas on how to make this work?

Thanks for all your responses.

DHD

RE: Am I looking for a "threaded insert"?

get a machine shop to make what you want - doesn't seem too difficult.

RE: Am I looking for a "threaded insert"?

I agree with Artisi.  If you are talking a one-off a machinist will give you exactly what you want.

RE: Am I looking for a "threaded insert"?

(OP)
Hmmm...
Never considered that.

Sounds expensive.  I'll need 500 pieces, actually.

RE: Am I looking for a "threaded insert"?

What purpose does the 'thread reducer' serve?

What loads are involved?

Could you let the Eye-bolt ring pull up against an outer washer:
Eye-bolt
Washer
ABS (clearance hole)
Washer
Nut

cheers

RE: Am I looking for a "threaded insert"?

(OP)
The eye bolt serves to let another bolt pass through it's loop to attach to a piece of polycarbonate that rests on top of the ABS, attached at a 90 degree angle.  I'm not sure how to quantify the loads. I'll have to think about it.

A washer would be fine, but the eye-bolt can't pass "through" the ABS.  The opposite side has to be flush.  The ABS rests on the floor, on the side opposite the eye-bolt loops.

RE: Am I looking for a "threaded insert"?

500 pieces shouldn't be too expensive it is a reasonable run - to set up for 1 needs 3 /4 to be made to get the 1st one to how you want it therefore one-off's tend to be expensive but from there 500 is easy.  

RE: Am I looking for a "threaded insert"?

Could several pieces be machined from a single piece of bar stock and progressively parted off?  

RE: Am I looking for a "threaded insert"?

Yes, find someone with a nice old barstock fed repetition lathe. They should be 45c each (OK joke, but that is what I last paid for a more complicated but similar part).

If you want them cheaper have you thought about some sort of self tapping thread?

Cheers

Greg Locock

SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.

RE: Am I looking for a "threaded insert"?

Look at the "Hole Series" and the "Speedsert" short series inserts from Groove-Pin. You may have to drop down a size.

http://www.groov-pin.com/threaded%20inserts/tins_specs.htm

You might want to look around this site

http://www.hansonrivet.com/w65.htm

Have you thought about using a Screw eye?

http://www.barnhillbolt.com/index.php?level=product&catid=-1&root=selection&group=&menu=749&display=specs&pid=749-A-A-01%2010078&custid=197586453

RE: Am I looking for a "threaded insert"?

How about a weld nut insert from McMaster-Carr?  Part number 90607A230.  It has a flange on one side with a boss that would pass through your 1/4" ABS.  The boss is just a hair over 1/4" long, so you would probably need a large diameter washer to fit over the boss, then a smaller washer to fit the eye bolt, then a nut to tighten the eye bolt down to the insert.

-handleman, CSWP (The new, easy test)

RE: Am I looking for a "threaded insert"?

(OP)
Handleman,
How would I bond the weld nut to the ABS?  I've heard of using heat or ultrasound, but don't know the details.  Would you suggest one of those techniques?

DHD

RE: Am I looking for a "threaded insert"?

You wouldn't need to bond it.  Just capitalize on the fact that it has a nice wide, thin flange on the bottom side.  Does your insert need to be anchored firmly prior to inserting the eye bolt?  Building on CorBlimeyLimey's idea, instead of

Eye-bolt
Washer
ABS (clearance hole)
Washer
Nut

You would have

Eye-bolt
Nut
Washer (fits eye bolt shank)
Slightly bigger washer (fits over "weld nut" boss)
ABS (clearance hole) with boss of "weld nut" sticking thru
Flange of "weld nut".
  

-handleman, CSWP (The new, easy test)

RE: Am I looking for a "threaded insert"?

(OP)
Looking through all those recommendations, above, it seems like maybe the best thing would be a barbed threaded insert that's installed using an ultrasonic or heat installation method.  Does anyone have some advice on where to learn about those methods?  I'm looking thinking about using something like this: http://www.groov-pin.com/threaded%20inserts/tins_specs_bs.htm

DHD  

RE: Am I looking for a "threaded insert"?

You've mentioned a quantity of 500 for these components, but have not stated a production rate.  Will these 500 last a year, a month, a week, a day or a shift?  Your manufacturing rate should dictate what your installation method will be. Without further info I would recommend some adhesive or epoxy.

You mentioned 1/4" ABS, are you concerned with deflection upon lifting?  If so, could this lifting eye be incorporated into some support component?

RE: Am I looking for a "threaded insert"?

I initially was going to propose the Barb-Sert until your OP mentioned threaded inserts. I think it will work in your case

If you contact Groove-Pin they will give you assistance with installing their insert. I would stay with a push-in system if possible due to your quantity. You might find a heating system on the surplus market. Ultrasonic insertion is prohibitively expensive and please don't think surplus.


For a good cross section of whats available in the insert market take a look at this site.  Look at the Microbarb,

http://www.tappex.co.uk/tappex_products.htm



 

RE: Am I looking for a "threaded insert"?

(OP)
Regarding quantities, I'm talking 500 total.  I build large sculptural art, so each piece is kind of like a prototype and production piece all at once.

In light of that, it sounds like the push in method might work.  I was worried about the strength of that method, but our loads are low, so it might work.

Regarding the keenserts, Kaynarguy...  I'm not sure I understand them.  What are they two tabs for?  Installation?  They seem a lot like a typical knife-threaded self tapping type.

 

RE: Am I looking for a "threaded insert"?

The tabs as you call them are what we call "Kees." These Kees are to stop the insert from rotating out of the structure when installed. The parent material is drilled and tapped (they are not self tapping), then the insert is screwed in to the hole up to the Kees and they are driven in to the material (asuming aluminum or other "soft" material).

The commercial versions (Keyserts) that may be best for you can be seen here;
http://www.alcoa.com/fastening_systems/commercial/en/product_category.asp?cat_id=685

Dave Beckett
Alcoa Fastening Systems
www.alcoafasteners.com
 

RE: Am I looking for a "threaded insert"?

It sounds like you are looking for something like a "Bulkhead Coupling" used in hydraulics.
Try searching for Weatherhead PN. W05465.
I think it is close to what you are looking for, the only problem is that the inside thread are NPT. The outside is straight thread.
Hope this helps, David

RE: Am I looking for a "threaded insert"?

(OP)
The Weatherhead part looks great, but it would probably only work if the outside thread was NPT and the inside was straight.  I would guess no one makes eye-bolts with NPT threading? Ha.

RE: Am I looking for a "threaded insert"?

Flat Head Screw
ABS sheet with CSK hole
Coupling nut
Eye Bolt

cheers

RE: Am I looking for a "threaded insert"?

The groov-pin inserts work great.  The only problem with them is you have to order them in pretty big qty, and they aren't that "cheap" compared to what you can get out of mcmaster carr.

James Spisich
Design Engineer, CSWP

RE: Am I looking for a "threaded insert"?

OK, try a "Binding Barrel".
McMaster-Carr #98002A910
It is not threaed on the out side but you could install it as a press fit or rough up the outside and glue it.

RE: Am I looking for a "threaded insert"?

I was looking at either T-Nuts or Propell Nuts to resolve your problem. I think that the Propell Nut might be the answer to your problem.

Propell nuts

http://indexfasteners.com/product/tnuts/pdfs/propell.pdf

Different T-Nuts.
Look at the slab 2 prong or the T-Nut for dense material.

http://metalformcompany.thomasnet.com/viewitems/crs-t-nut-fasteners-with-prongs/slab-base-2-prongs

http://www.stafast.com/products/utnut.html


 

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