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Posted: 10/30/2005 1:16:47 AM EDT
Is 1/2"x28 tpi (AR15 flash hider) and 1/2"x28 UNEF the same thread size?
Link Posted: 10/30/2005 6:49:13 AM EDT
"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, 45º angle, etc.) as well.
Link Posted: 10/30/2005 7:55:38 AM EDT

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...
Link Posted: 10/30/2005 8:11:16 AM EDT
UNEF=Unified Extra Fine Thread Series
UNF=Unified Fine Thread Series

Is the standard AR15 flash hider UNEF or UNF threaded?

Thanks,
A-15
Link Posted: 10/30/2005 8:50:45 AM EDT
[Last Edit: 10/30/2005 9:01:01 AM EDT 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
Link Posted: 10/30/2005 9:14:45 AM EDT
Link Posted: 10/30/2005 9:17:13 AM EDT
UNEF,....yes!
Thank you!
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