Internal NPT Thread in SolidWorks - TUTORIAL

[@smartskillsbd]

One of the most detailed, mechanically accurate tutorial on thread design in Solidworks. Amazing work and thanks!

[@nuclearpasta9240]

Best tutorial for NPT threads on youtube.

[@tsslaporte]

Thank you for this video! One thing I want to add is to make sure you have the correct thread direction (RH vs LH) you can reverse it in the Helix settings if needed.

[@axelateon1384]

this tutorial is pure gold

[@nor_cal_trailrides9990]

Thanks! I followed your directions to create a 1/4-18 npt tool solid. worked awesome!!

[@nickmagerl]

WOW, NICE. Im going to have to play this video a couple times and practice to get it right. Trying to create 3/4-18 UNS threads on a part and figuring out how to do the math is killing me, never been a machinist.

[@stixakaslim5417]

Great tutorial!!! I really appreciate how you even showed how to do how to the formulas!! I never knew you could input formulas into the dimensions as you demonstrated. GREAT JOB man!!!! I'm definitely going to subscribe to your channel now.

[@Xicardox]

Amazing! I'm designing at solidworks 2020 and this class helped me a lot. thank you very much!

[@CADD-BARRY]

Very Nice ..... Hope we see more videos like this from you... It helps us a lot. Thanks!!!! Love From India!!!!

[@omprakashmaurya611]

Nice demo. You can combine both helix paths by using a single Composite curves and use that composite curve as path and single sketch for the sweep cut instead of using two sweep cuts.

[@encole7224]

It didn't work that well. I tried. Somehow Solidworks did not like a composite curve made from two helixes. Also, independently each helix is easier to control; it's a less elegant solution but more straightforward.

[@qzorn4440]

Sir, this is the most wonderful detailed NPT tapered pipe thread video ever!!! i have been learning freecad which is some what like solidworks to make a 1/4" 18 threads 5000psi tapered male pipe adapter, which was ok to design the basic object. however, to get the pipe specifications numbers to come out was a huge mystery? now with your precise explanation and how to interpret the design standard table, i think i can do it now? this video should of been the 1st thread video to watch... g-code, stl, cnc, and 3d printers should be happy now. thanks a lot...:)

[@jimheimerl1637]

Your video was a lifesaver - thank you for being so thorough.

[@encole7224]

Thank you!

[@nicoletara353]

yasss thank you so much sir! needed this for my internship project, which involves threads.

[@encole7224]

Thanks! Glad I can help.

[@thisishow551]

If I could I would give this two thumbs up.

[@TediumGenius]

Yeah, this is a great tutorial Encole!!

[@germas369]

Thank you very much. I used this workflow in Creo and works perfectly.

[@stevensimpson6208]

Incredibly helpful. Thank you. You are extremely talented at teaching. Subscribed!

[@foxboro1204]

Very nice tutorial ! very clear even for beginner like me. THanks !

[@bluehornet6752]

You are incredible--great demonstration & tutorial. Thanks!

[@tritile]

What a great professor you are! Thank you very much!

[@johnathonwalty8915]

Very clear explanation. Thank you. 👍

[@tornado214]

Exacly what i needed. Great tutorial! Thanks

[@phantomwerksdesigns856]

Thank you so much for making this! Helped me learn A LOT today!

[@robd2650]

Great video. We are incorporating two 1/8 -27 pipe threads into a housing, that we're thinking of trying to 3/D print. I'm not sure how tolerances would work, but we obviously need an accurate production quality, version, which I believe you have helped me create. We're going with blind holes so I just went with a .47 dp. starting hole which is what SW's did for a cosmetic thread. I'm also going to need a 12-20 straight thread, & I saw you had commented about SW being able to do that for a few years now. Do you think what they allow for in 2019 sp5, will produce a production quality straight thread, or do I need to start from scratch etc.? They seem to give some kind of warning that they're not for production.

[@encole7224]

Rob, thank you for the comment. I would make the thread from scratch, as you say. This way you will have full control of the minor/major thread diameters, tooth shape, etc. We typically use SW default threads for general design concepts, not for production files. For production, use what you can control, so you will have no doubt what will be fabricated. Cheers, -Alex

[@robd2650]

@@encole7224 Thanks for the reply. Would you advise any resources for creating a straight thread. Not so much the Solidworks info., but understanding the thread itself. I have worked with some sources, but it gets a bit hazy, as to what would go with the 1/2 -20 internal, or external perimeters. They seem to use the same info. which is also a bit confusing because it almost seems to create a line to line condition. Thanks for any heads up, but if not, really appreciate the pipe threads anyway, they went quite smoothly.

[@encole7224]

@@robd2650 Look for "machinery handbook thread chart". This is a solid guide. Internal threads and external threads have different diameters for the same thread size. The book will give you the exact dimensions with tolerances, per thread size and also per thread class. The concept of making straight threads is the same as tapered. The difference is the helix is not at an angle. The other moves are the same. Cheers, -Alex

[@lucasrey3703]

Hi! just wanted to specify that the taper angle is arctan[(1/16)/2] = 1.79 deg, not arctan[(1/16)]. This is because 1/16 is over the diameter, not over the radius.

[@encole7224]

Thanks Lucas, You are correct.

[@VerifiedCAD]

The equation at 5:13 should be atn(1/32). It's a tiny error that won't matter on most fittings though.

[@encole7224]

You are right on both points: it should be atn (1/16, which is the combined angle / divided by 2), for the half of the revolve feature. So, atn(1/16/2); or atn(1/32). For the second point, you are correct about practical manufacturing to the model. Tolerance is very small for the actual angle derived as atn(1/32), or angle measured as atn(1/16) divided by 2 after. Thanks for the comment!

[@mehul2011]

Thank you for sharing your experience

[@matthewneesley761]

FANTASTIC! Thanks very much for this video!

[@charlielambert8703]

Great tutorial, use it a lot. I'm wondering however why the pitch of the thread is parallel to the taper instead of being vertical? Doesn't this make it so that the male NPT thread won't mesh correctly? Why wouldn't you model it so that the threads aren't angled a that taper? Thanks!

[@encole7224]

Thanks Charlie for the comment. You are correct about the model, where the root of the teeth is not parallel to the taper, it's an oversimplification in the model. The tooth root line should be aligned with the taper. However, in the real world when the threads are made, the cutter point moves along the spiral at the taper angle. This makes the root parallel in the actual threads. So, if the model is used to program the CNC, then it will work out.

[@charlielambert8703]

@@encole7224 This seems like an odd oversimplification to make when it is really no harder to model it the way that it actually is. Essentially this tutorial would not be correct for someone trying to 3D print NPT threads from model for instance.

[@alperkologlu2845]

Firstly thanks for the video, but I think that the last part of the thread would go with the same angle in practical applications. And I think the problem with the unintentional tooth is due to circle you drew in order to create a plain for the second part of the thread. And lastly, can we do it with cosmetic threads?

[@encole7224]

Hi Alper, thank you for your comment. In later SW versions you can use thread features for cutting straight threads, but not for tapered threads such as NPT of British BSPT.

[@ryanwallace5871]

Great video!

[@davids9098]

Good tutorial. Thanks! A bit more involved than the external NPT thread version! :-)

[@shafqatfarooq8924]

Good Tutorial! Also, just wondering why did you take 10 threads as thread depth? Shouldn't the depth length be coming from the NPT standard?

[@encole7224]

Thank you for the comment, good point. The video is to demonstrate the process of making the thread. In practice, thread lengths are made to a specific application, matching the length of the mating part. As long as the taper, the pitch and the root diameter are within the spec the parts will engage. For example, take a look at NPT taps, they have 16-17 full threads in case the internal bore needs to be longer for some reason. Technically, you have a good point about adhering to the standard.

[@mdlo7401]

Thats a fantastic tutorial. Thank you.

[@encole7224]

Thanks!

[@corsonp7727]

This was SO helpful! Thank you!

[@niltonmalaquias2160]

Perfect, please is possible to show an assembling using both parts? just to see how it matchs the threads.

[@encole7224]

Hi Nilton, see this: kzbin.info/www/bejne/rIGtq3Rmhcx1mac

[@JeffreyHawkins]

Excellent. Thanks!

[@hienaz723]

Thank for explain npt thread

[@obinnaemeka2245]

Nice tutorial..thanks. How do you give your model such glossy look?

[@encole7224]

Assign material to the part. Then select Real View Graphics. This is the option under standard views. In the video you can see this option selected. It's a gold-looking sphere. You can see it at the upper right corner of the screen, next to other view options.

[@anitan121]

Excellent tutorial.

[@encole7224]

Thanks!

[@ILgbar183IL]

Thank you so much. This is very informative!

[@whiterook8022]

What's your accent? Excellent work, much appreciated.

[@chase5155]

Thanks for your help!

[@CodyTres7]

Thank you so much!

[@eljer0n]

Still actual, still great!

[@MisterFizz]

Question: What material and appearance settings were used for the part? It is rendered quite well. I don't see a gold looking sphere at the top of Solidworks screen.

[@encole7224]

It was done in 304 Stainless

[@encole7224]

Setting was set to Real View. As long as the video card has memory to render, it will look like the actual material. SW is good for that. Thank you for the comment!

[@heartminer5487]

Hi, is here ways to use the toolbox for making tapered threads? The toolbox configuration actually has all of the dimension for tapered threads, but I see no way to make tapered threads other than cosmetic ones.

[@robertjustice8267]

I followed both videos and came up with a much "Thicker" male thread. A much thicker "Root" on male. I am wondering if i should use same Root & Crest formula on the male as i did for female, is this common?

[@alexandernunez6702]

Just what i needed!

[@mepratikpawar]

Hey Alex, Thanks for this tutorial. Need some help, I used it for creating this in plastic part injection molded. However threads are not meeting the gauge checks. Both male and female threads are enlarged and plug gauge moves all the way in and ring guage stucks at 1st thread for male npt. Any recommendations or quick thoughts, because I am not able to find the mistake in design.

[@encole7224]

Hi Pratik, this is a tolerancing issue. It's a good practice to make a trail part. You are doing it right. Adjust the dimensions (on your mill, lathe) within the tolerances. This is a try-and-adjust process, we always make NPT threads like that. Sometimes the customer has a part that is on the other side of tolerances, this needs to be accommodated. I think gauges are made to so many minimum thread engagements. In the video it's likely not the same, thus you are having the issues.

[@mtforger]

Excellent!

[@Dj_Cerrillo]

Excellent video, to make a 4-inch NPT external thread, could you help me? 🥺

[@encole7224]

For external threads, take a look at this tutorial: kzbin.info/www/bejne/hoOskpWlitiSfJo Use table values for 4-inch threads. O.D. of pipe 4.500. Height of thread: 0.100. All moves are the same for this size as for NPT 2" in the tutorial. Thank you for the comment!

[@Dj_Cerrillo]

@@encole7224 Except for the thread cut, which must have a center separation of 4.33438, which it says in the table, right?

[@encole7224]

@@Dj_CerrilloYes, that's the pitch dia. at the beginning of external thread. This is another way making the thread, starting with this diameter and work from there with the angle and tooth height. I think the way I made it in this video was starting from the Nominal Dia. and working from there. Either way will work. The important point is to make the actual thread to meet the gauge inspection within tolerance. CAD model is just a reference for the shop making it.

[@Dj_Cerrillo]

@@encole7224 I thank you infinitely for answering me, it was very helpful to me, since I am making a design to adapt an ultrasonic sensor to a 4-inch coupling and I am going to print the thread along with my design on a 3D printer to see how it goes. Beforehand thank you very much.

[@encole7224]

@@Dj_CerrilloLooking forward to your progress!

[@iulianmoga9410]

Good Job ! Thanks !

[@misnik1986]

thanks for this great video

[@MisterFizz]

Well done. Scrib'd!

[@MELVINBIGSMOKE]

Nice tutorial... Can you also do a tutorial for NPS threads? Thanks.

[@encole7224]

NPS is simpler than NPT. Same steps to produce, sans the taper. In other words, the bar stock material is cylindrical, omit the step where the taper cut is revolved around the center axis. And the Helix is not tapered, uncheck the "Taper" box in the helix feature in SolidWorks. Everything else is the same, pitch, tooth height, all diameters.

[@MELVINBIGSMOKE]

Thanks ... I made it... :-)

[@encole7224]

Great!

[@clarkhollister1472]

Well done!

[@ianliuart]

@7:36 may I know why there is a 0.001 in offset from the tapper edge to the triangle’s base?

[@encole7224]

This is to make sure the clean cut. Sometimes Solidworks has a problem with line to line cuts, where the sketch borders another feature. This .001 offset makes sure the sketch overlaps the adjacent edge of the part, guaranteeing a clean cut.

[@ianliuart]

@@encole7224 thank you so much. This is very helpful.

[@mahmoodvakili8602]

very nice and helpful for me

[@encole7224]

Thanks!

[@lightningxx]

Thankyou!

[@carlosmolinagodoy1115]

where it say the depth of taper should be 9 to 13 full threads?

[@encole7224]

Gauge needs to be flush with the front of threads. This is 5.01 thread engagement, a must for any NPT thread. Maximum thread engagement is 8 threads (dimension L2 in NPT charts). More than that is a discretion depending on the use case, and thread release. Helps?

[@stevepaventy3645]

I see that in your external thread demo, you make the large side of the thread cutter parallel to the axis but you make it parallel to the taper for the internal thread. Is this intentional? Does it matter which way the cutter is controlled?

[@encole7224]

The flat root of the thread will be tapered either way the cutter is positioned. The cutter moves at the same angle as the taper, so regardless if the cutting tool (the tip end of the cutter) itself is parallel to the taper or not, the cut will always be tapered. The same is simulated in the model.

[@stevepaventy3645]

Wow, thanks for a very fast response. Pls excuse me, but I still have a question. Just to clarify, I'm not questioning your knowledge nor trying to be argumentative. I'm just trying to learn about pipe threads. I realize that the taper will still be the same and that the cutter will travel along the taper. But if the tip of the cutter is parallel to the axis, then the top side of the "V" thread would be +30deg from horizontal and the bottom side of the thread would be -30deg. But if the tip of the cutter is parallel to the taper, then the top side of the V would be at +28.210deg from horizontal and the bottom of the V would be at -31.789deg from horizontal. (Right?) I just don't know if it matters.

[@encole7224]

​@@stevepaventy3645 You are right about the thread side angles, assuming the cutter is trapezoidal exactly as the shape of the tooth. Then, yes, the walls will be 30 degrees +/- the half-taper angle. In reality these threads are cut with a single-point cutter where the shape of the tip is totally different from the final shape of the tooth. The cutter follows the helix taper path several times, removing little material per cut, depending on how soft the material is. In SolidWorks the cut is made in a single run, thus the difference between a 3D model and the actual, physical part.

[@stevepaventy3645]

Got it. Thank you for the fast replies. And, by the way, I should mention that your tutorials are very well done. They get right to the point, proper volume, very clear and easy to follow, etc., and I appreciate that you, and people like you, take the time to do it.

[@encole7224]

Many thanks, Steve! Warmest Wishes, Alex

[@akeemlouigarde4689]

how do you know its suppose to be 10 revolutions? I didn't see it on the data sheet

[@encole7224]

Good question. Technically you need 8.7 threads. www.engineersedge.com/hardware/taper-pipe-threads.htm This is a blind bore where a few more threads must be added. 10 threads will pass the gauge and also will provide clearance to whatever fitting goes into the bore. Makes sense?

[@H3CLEC]

You have the PDF or link of the table?

[@encole7224]

There are two pictures in the Instagram post: instagram.com/p/CdSANl_L8tX/?igshid=MDJmNzVkMjY=

[@engineet]

hello I hope you can upload a PG thread tutorial, I have been trying yo do but I can't :(

[@anonymousVSnwo]

PG thread is not tapered it should be done the same as a regular straight thread but with a 80 degrees angle instead of 60

[@Technoboy928]

So, both external and internal treads are of the same dimensions?

[@encole7224]

There is a separate video for external thread. Same size, NPT 2". Dimensions are the same, except the internal thread has a starting bore diameter which is different from the external threads nominal dia. 2.375. The rest of the dimensions: tooth height, pitch, angles, are the same. Thank you for the question!

[@Technoboy928]

@@encole7224 Thanks for your reply. Where can I find the two charts? And are these the same threads used on electrical conduits?

[@encole7224]

@@Technoboy928 Take a look at Machinery's Handbook. Available on Amazon, many other places. For electrical conduits, yes, NPT pipe joining is common. Vibration resistant, thermal expansion proof, leak-tight, long lasting pipelines. Typical in plumbing lines for fluids, air. Wiring cables can also be run through such pipelines.

[@Technoboy928]

@@encole7224 Thanks a lot.

[@simonsuarez7561]

Could you please tell the name of the book about NPT threads? Thank you

[@encole7224]

It's "Machinery's Handbook". It's available from several online book stores. There are several editions, the version I used is 25th or 26th edition.

[@simonsuarez7561]

@@encole7224 You're very kind. Thanks!

[@adrunalintech3411]

Hi plz external thread of api norme

[@leormach2006]

Thanks for the help. @Farahnaz Lie-Kwie-Sjoe, life would be better without your poor comment, ok?! The guy is helping people to do their jobs. Go and try to the same.

[@jimheimerl1637]

"So not relevant...but really like your voice and accent haha" Now that I read Farahnaz's comment again, I think they meant that the fact that they like the voice and accent is not really relevant to the video. I don't think the comment was meant as spam or mean. Just my interpretation, but I understand what you meant, Leonardo. And yes, this video was *EXTREMELY* helpful - and relevant - to a project I am working on.

[@rodolfohernandez3497]

Can you pass me the tables about thread ? please...

[@encole7224]

Look for "npt internal threads" in a search engine images tab. You fill see pictures of pages from "Machinery's Handbook", the original source. Thank you for the comment, be safe!

[@carbon273]

So much work for no reason. Why doesnt solidworks have a feature that converts a cosmetic thread into actual threads? Seems like a simple oversight.

[@encole7224]

SW does have a thread feature for straight threads only, not tapered. This feature is available in SW post 2015-ish versions.

[@inlineindustry2283]

@7:22 My parallel relationship was not available.

[@alanalexisaa7106]

Not is the better option

[@AlexandrIDK]

Уж можно было и не изгаляться по английски... акцент выдаёт... хотя смотря какая аудитория...

[@3dmaxat567]

Thank you so much!