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A-15
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Posted: 10/30/2005 5:16:47 AM
Is 1/2"x28 tpi (AR15 flash hider) and 1/2"x28 UNEF the same thread size?
GHPorter
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Posted: 10/30/2005 10:49:13 AM
"TPI" is just how many threads per inch, or the "thread pitch" needed. I don't recall right off what the "UN" in "UNEF" stands for, but it not only states "extra fine" but the form of the threads (square, round, 45┬║ angle, etc.) as well.
Gunzilla
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Posted: 10/30/2005 11:55:38 AM

Originally Posted By GHPorter:
I don't recall right off what the "UN" in "UNEF"



"unified" -- part of the UTS system, rapidly being killed off by ISO...
A-15
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Posted: 10/30/2005 12:11:16 PM
UNEF=Unified Extra Fine Thread Series
UNF=Unified Fine Thread Series

Is the standard AR15 flash hider UNEF or UNF threaded?

Thanks,
A-15
j3_
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Posted: 10/30/2005 12:50:45 PM
[Last Edit: 10/30/2005 1:01:01 PM by j3_]
The book I have says

UNC

Fraction_______________________Threads
1/2"__________________________12


UNC

Fraction _______________________Threads
1/2"___________________________13


UNF

Fraction_______________________Threads
1/2"__________________________20


UNEF

Fraction_______________________Threads
1/2"__________________________28
Tweak
of ar15.com/forums/forum.html?b=3&f=66
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Posted: 10/30/2005 1:14:45 PM
Moderation is for monks. RAH
It's a thankless job, luckily I have karma to burn.
HEY YOU WASHINGTONIANS!
http://ar15.com/forums/forum.html?b=8&f=15
A-15
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Posted: 10/30/2005 1:17:13 PM
UNEF,....yes!
Thank you!