1/2x28 TPI threading diagram?

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[ARCHIVED THREAD] - 1/2x28 TPI threading diagram?

Kaptain_Haddock

Joined Apr 2008
Posts 92
EE Offline

FIN

Posted: 10/17/2008 12:39:29 AM EST

[Last Edit: 10/17/2008 12:45:21 AM EST by Kaptain_Haddock]

I'm looking for a picture, I think I saw it in this forum, or atleast on arfcom, it was a diagram of the 1/2x28 thread pitch, with measurements and so forth. I'd like to find that diagram so I can take it to my gunsmith because he is going to make a thread adapter for my rifle.

Suppressors here are almost always in 1/2x20 UNF, but AR's are in 1/2x28 TPI and is something of an unknown here, I am not sure if the gunsmith only has the info for 1/2x28 UNF threads or if he has for 1/2x28 TPI too.

I'd like to find that diagram to make sure.

Also I don't know but maybe UNF and TPI are the same?

GunDisaster Joined Aug 2004 Posts 2061 EE Offline TX, USA	Posted: 10/17/2008 1:08:53 AM EST 1/2"x28TPI means the threads are half an inch in diamter and there are 28 threads per inch.

WildWilli President - MissouriCarry.com Joined Aug 2007 Posts 433 EE Offline MO, USA	Posted: 10/17/2008 6:09:42 AM EST Here is a .pdf file of the 1/2 x 28 thread pattern that YHM makes available in their installation instructions. www.yhm.net/store/media/.223.pdf You will need Adobe or some other .pdf reader to view.
	---WildWilli out--> "It is better to have and not need than to need and not have." >>> "In Guns We Trust" <<< not just a motto...a way of life!

1928A1

Silencers have NEVER been illegal....

Joined Sep 2003
Posts 2689
EE Offline

AR, USA

Posted: 10/17/2008 8:07:36 AM EST

Originally Posted By Kaptain_Haddock:
I'm looking for a picture, I think I saw it in this forum, or atleast on arfcom, it was a diagram of the 1/2x28 thread pitch, with measurements and so forth. I'd like to find that diagram so I can take it to my gunsmith because he is going to make a thread adapter for my rifle.

Suppressors here are almost always in 1/2x20 UNF, but AR's are in 1/2x28 TPI and is something of an unknown here, I am not sure if the gunsmith only has the info for 1/2x28 UNF threads or if he has for 1/2x28 TPI too.

I'd like to find that diagram to make sure.

Also I don't know but maybe UNF and TPI are the same?

http://www.silencerresearch.com/Forum/viewtopic.php?t=367

There are three companies threading specs on my site. AAC's, Gemtech, and YHM.

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[ARCHIVED THREAD] - 1/2x28 TPI threading diagram?

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