National Pipe Thread

#Shorts

[AJ-yxcq]

Did this dude set up a whole studio to show us threads? I’m here for it!

[filster]

I’ve been a toolmaker for 40 years, the taper of that NPT hole is extreme.

[teebob]

As someone who used to work in a machinists shop, I could watch videos about threaded/tapped holes all day long.

[joelvarney]

Finally I understand why pipe threads are tapered. Nobody has bothered to explain this to me before.

Edit: more in the comments for those who care to read before posting.

[codyreber]

Teflon tape on the patent was intended to be a lubricant, not a sealant. Controversial but its true that its a lube and not sealant. The seal is due to increased penetration from lubrication.

[OrdinaryDude]

National Pipe Thread is a group of several different straight and tapered screw thread standards. It’s a common misconception that NPT stands for “National Pipe Thread” when talking about tapered threads when NPT actually stands for “National Pipe Taper”.

[fredflintstone]

The Teflon tape is for lubricating the threads as the fittings are screwed together preventing thread galling letting the fittings screw together farther causing them to seal better.

[johnbattista]

NPT. National Pipe Tapered
NPS National Pipe Straight
That’s what it is called per the Machinist’s Handbook

[tylermiller]

I’m a machinist and QC tech at an Automotive OEM. I love this simple explanation of NPT threads and your channel in general. I hope you continue to grow and show people cool stuff!!

[BerzerkaDurk]

Teflon tape is intended as an aid for tightening. The threads do the sealing. I'd recommend an NPTF thread, it's a dry seal thread, intended to be used without sealant.

[allangibson]

NPT is a dry seal thread. You don’t need tape or sealant to get it to seal. Adding teflon will make them easier to take apart however.
BSPT isn’t a dry seal thread - it was originally designed around a fibrous sealant and then shifted to Teflon and Adhesive sealants. BSPP (same thread form but parallel) uses gaskets for sealing. Metric GP pipe uses BSP threads.

[piratecheese]

i work irrigation estimation and the hardest part of the job was trying to figure out all the thread standards. slip (F/M, I)PT, NPT, GH, NH, NPSH, UNC, BPST/BSPP and metric

[ourtube]

You can find a lot more on the ASME spec B 1.20.1. In addition to the helical wedging caused by the matching tapers, pipe threads are often assembled with a thread sealant which has the dual purpose of lubricating the connection so you can tighten it further and sealing gaps between the threads. Common thread sealants are teflon tape which is usually used in plumbing applications and pipe dope which is mostly used in gas bearing connections.

[plumberpete]

The taper of the treads in this illustration seems steeper that that of the NPT I'm used to working with.

[XroorX]

Never knew what a NPT fitting was to a point I could explain it to my kid. Thanks for teaching me this data

[OliverPI-vj]

more bps space shorts? Keep them coming!

[OgOssman]

It's so fun to watch a book smart person discover 100 yr old mechanical technology. Yes this is how it works and that's why it's standard.

[Whosaids]

You made standard pipe threads so interesting that I forgot it was just about standard pipe threads. Pretty cool there, bub.

[diverbob]

Per the machinist's handbook back about 50 years ago when I was using it, 3 and 1/2 turns of properly formed NPT threads would bring them metal to metal and from the seal.

[bradhuf]

Depending on the pressure, if it’s very high you’d use thread sealant. Teflon tape is a no no and can actually help walk the fitting out of the thread.