pipe thread angle

[gld]

Machinery Handbook states American Pipe thread angle is 1°- 47".

Is it the same for model taper pipe?

I assume it is, but assuming seems to always get me in trouble. :fan:

Google does'nt know either.

 

[Steve J]

I believe model pipe thread is straight. P M research web site has a lot of info on that since they sell all the taps dies and do it yourself fittings.

 

[MachineTom]

Yes. the machinery handbook states .750" taper per foot for all pipe threads from 1/16" up. Non tapered threads are also common, and those use an O-ring and jam nut w/washer to seal.

I know of parts sold with straight male threads, that thread into tapered female fitting, I've not seen two straight threaded parts that thread together and not use an O-ring to seal.

 

[Steve J]

Like I said check PM RESEARCH web site. the have straight model pipe threads that use sealant to seal. They also have RECENTLY started offering tapered fittings and taps and dies.

 

[fltenwheeler]

Yes, MTP is the same angle as full size pipe. 3/4" per foot. The 5/16-27 MTP is the same as 1/16" pipe.

The taps and dies for MTP are available from more than one source.

PM RESEARCH sells both straight and MTP fittings.

Tim

Machinery Handbook states American Pipe thread angle is 1°- 47".

Is it the same for model taper pipe?

I assume it is, but assuming seems to always get me in trouble. :fan:

Google does'nt know either.

 

[gld]

Thanks Tim

I have the 3/16-40 MTP from PM.

I need to do a short 1/4 pipe, and hate to spend the 65 bucks for the 1/4-40 tap & die witch I would probably never use again. Besides, it will be more fun to make them. I have made several taps, but never hardened one. I need to find out what material is used to cover threads when heat treating. And where to purchase same.