need help cutting 1/2-14 npt threads id.... need dimensions plz help

[keith williamson]

im working on a haas ds30y and am try to cut threads I don't know if its just me but I cant seem to find id dimensions on any sites I am using g76 to cut them if anyone know a site to find them of what they are would help greatly thx

 

[npolanosky]

im working on a haas ds30y and am try to cut threads I don't know if its just me but I cant seem to find id dimensions on any sites I am using g76 to cut them if anyone know a site to find them of what they are would help greatly thx

UN imperial screw thread calculator

Pick your thread, pick you tolerance (also where ID or OD gets selected, 2A vs 2B for example), hit calculate, bob's your uncle.

 

[keith williamson]

do you know one for 1/2-14npt

 

[npolanosky]

do you know one for 1/2-14npt

Ah, missed the NPT part. Sorry, nothing off the top of my head. Checked machinery's handbook?

 

[keith williamson]

thanks tho
I cant seem to find much on npt on the net

 

[Spruewell]

30 second search for “pipe thread specifications”:

National Standard Taper Pipe Threads Size NPT Chart - Engineers Edge

NPT Thread Dimensions

There are many more..
And don’t forget to invest in a gauge.

Plug Pipe Thread Gages - MSCDirect.com

 

[keith williamson]

I looked at that is that id thread sizes

 

[Spruewell]

The links contain charts and explanations of the different features such as pitch, diameter and taper for various sizes of internal and external pipe threads. The plug gauge is for checking internal (female) pipe thread size. To measure external (male) pipe thread, you need a ring gauge.

 

[Spruewell]

If you are wanting to know what size hole you need to drill:

Pipe Thread Tap and Drill Size Chart ANSI NPT - Engineers Edge

 

[litlerob1]

The basic Minor diameter at the small end of the hole .701". There is 1/16 taper per inch.

R

 

[Bobw]

Get yourself some ThreadPal. Made by a member here, best $100 you'll ever
spend.. Especially if you do a lot of weird threads, Acme, J-threads, Sti's.
Etc. Probably the most effective and profitable $100 I've ever spent.

Diameter at the pipe face, .7246, taper in from there. Thread height .0539"