AN Thread size

[crogers1146]

Hi Guys,

New to 360, 3D in general and trying to creating some basics model for reference/print. At the moment I am stuck on inserting a thread and picking the correct size.

I an after the AN-12 (I believe this is 1-1/16-12 SAE) size but after checking all the thread type drop downs, I am not able to find either type. My environment is set to Metric(mm). Does this mean I need to create a custom thread type or change to Freedom units (inch).

Any device/pointers would be appreciated. 

[Warmingup1953]

t doesn't matter what units your Document is set to. So that isn't the issue.  AN threads aren't included in Thread Tool..JIS are...Does it have to be AN?

McMaster Carr doesn't have these either but they have similar(Perhaps)

[crogers1146]

Ideally yes, the final product will be machined for, and be taking AN fittings. The print will be used as a test fit prototype, so been able to put in fittings would make it more realistic. So if it was possible to print the threads, it would make test fitting different fittings allot easier.

[Warmingup1953 · Accepted solution]

Well the hard part is done:

[Warmingup1953 · Accepted solution]

UNJ is a fair bit tighter tolerances it seems.

[crogers1146]

Legend. I was going through them but was expecting to see is it as 1-1/16-12 SAE. 

[crogers1146]

Picking this up again trying to design for AN threads.

I am having allot of issues trying to get the AN/SAE threads to work on a 3d printer and an wondering if I'm setting the wrong things in Fusion.

I've created NTP and metric M16/M18/M12 threads in fusion that all printed out fine and were usable as both nuts and bolts on rea life metal objects. However, I have not been able to print a single AN/SAE male/female thread that actually works.

Because metric and NTP work, i don't think the issue is with the printer, but more so the thread type i'm picking in fusion.

So the question for AN/SAE, is the above method correct?

[MRWakefield]

I remember looking into this when the question was first posted but @Warmingup1953 got there before me. All the information I've found online regarding these fittings agrees with what was posted above, i.e. 1 1/16-12 UN. Even though you've printed other threads that fit have you tried modifying the threads by offsetting the thread faces to make them smaller/larger? This is common practise to to get 3D printed threads to fit. Do the same whether it's internal or external.

EDIT:

I've been doing a bit more Googling and found out that AN is essentially the same as JIC. JIC is the industrial version and has looser tolerances than the AN fittings. Do you have a thread pitch gauge so you can confirm the mating part is 12 TPI?

Hope this helps.

[crogers1146]

I did check the TPI, and both (printed and real AN fittings) seem correct. I haven't increased the tolerance on the teeth, I was more curious if I was doing something wrong in the software. Should I be choosing the "ASNI Unified Screw Thread" or ....

I figured a M6x1.25 or M16x1.5 would have tighter tolerance than a 1 1/16-12 UN, so the printer must be fine and it must be something I'm doing wrong in fusion.

But if that is the correct thread type in the drop down. I'm happy, it doesn't have to work on the print. It's more so if I'm handing the model over. I can give both the threaded and non (with drawing). Just don't want to get screwed because of a wrong drop down.

[MRWakefield · Accepted solution]

Yes, generally speaking smaller diameter threads will have tighter tolerances and smaller clearances than larger threads, so I can understand your reasoning.

More often than not you will give a manufacturer a drawing with a thread callout specifying the thread and sometimes a solid model. The solid model wouldn't usually have modelled threads and they'd usually get the thread designation from the drawing. I guess you could always specify something like "Thread to mate with AN-12 fitting" or similar if you're not confident but there are plenty of references specifying that an AN-12 (or JIC-12) has a 1 1/16-12 UN thread.

Here are a couple of web pages I've found which might help identify your mating thread:

• https://www.hydraulicsdirect.com/Fitting-Thread-Chart-s/1934.htm
• https://trimantec.com/blogs/t/thread-identification-guide

As I said in my previous post it would appear that JIC-12 is the industrial equivalent of AN-12 and will have larger tolerances. Consequently manufacturing costs are likely to be lower if you choose the JIC-12 if the tighter tolerances of AN-12 are not needed in your application.

Hope this helps.

[crogers1146]

BTW, if anyone comes here. I was able to get a usable printed thread. I Set my P1s to .08mm layer height for when it was doing the threads and works like butter. Didn't try the .12mm

[ruizerick1370]

Which thread profile do you end up using, if you don't mind, Thanks