• WTK: AAC 51T ACME thread pitch once and for all!

Posted: **Wed Aug 27, 2014 10:55 pm**

Hey guys, hopefully one of you can help me out.

I have searched high and low but I haven't been able to find a solid be all end all answer.

what size is the ACME thread pitch on the 51T flash hider?? is it 8 tpi , 7 tpi , 7.5tpi????

any one!! my google fu seems to be lacking at the moment

Posted: **Thu Aug 28, 2014 5:05 am**

i seem to remember bender saying its close to 9.5 if i remember correctly…

Posted: **Sun Aug 31, 2014 8:06 pm**

135 views and still no solid answer?

come on guys some one has to know for sure

if I had the means of measuring the threads I would figure it out myself but I don't have the the right equipment to do it correctly.

Posted: **Sun Aug 31, 2014 8:30 pm**

Ask this guy

sizulku wrote: Hi Gunny,

Which one is perform better, using the same spacing length or different spacing length?

I build my 556 nato can based on AAC M4-2000 above. Its 2" diameter and 10" long. Nine 60-degree cones baffle. Bore is 0.252" and all spacer is 0.5".
I shot side-by-side at the range with AAC M4-2000 and unable to tell difference the sound of this can compare to AAC M4-2000 except the size and weight. I'm not happy with this result. the good thing of this can is I don't get POI shift.

Any suggestion?

Posted: **Sun Aug 31, 2014 9:06 pm**

John

Thanks for the reply , I did infact try asking him and I never got a response. He said he was going to check his notes and he never got back me in the post.

I may try to find one of those little fold out thread combs in ACME and take it to the flash hider I have , I have heard many different sizes from people, I know the YHM phantom threads are 8tpi and it looks really close to the AAC so I was figuring it's gotta be close to that.

Thank you again for the help

Posted: **Sun Aug 31, 2014 9:33 pm**

You're welcome. I do believe bender knows and I seem to remember him saying it's 9.5ish

Posted: **Wed Oct 08, 2014 2:10 pm**

Hi Gents.

Sorry for delays. I use metric thread number 4 as shown on the picture below.

this is the machine

metric thread pitch list

my setup

making aac nut

result

hope this help.

Posted: **Wed Oct 08, 2014 6:49 pm**

Not worthy… thank you Sir you have done a great service for all..

Posted: **Wed Oct 08, 2014 8:45 pm**

so, a 4mm pitch makes kit 6.35 tpi. I thought 9.5 would be a little odd, most manual lathes wouldn't be able to cut a 9.5 pitch i wouldnt think. I'm sure it wouldn't be a problem for a CNC.

A 4mm pitch should be doable on most machines.

Posted: **Thu Jan 02, 2020 4:44 pm**

Sorry to hijack the thread, but if someone has the acme thread pattern for the AAC Cyclops it would be much appreciated.

WTK: AAC 51T ACME thread pitch once and for all!

WTK: AAC 51T ACME thread pitch once and for all!

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Re: WTK: AAC 51T ACME thread pitch once and for all!

Re: WTK: AAC 51T ACME thread pitch once and for all!

Re: WTK: AAC 51T ACME thread pitch once and for all!

Re: WTK: AAC 51T ACME thread pitch once and for all!

Re: WTK: AAC 51T ACME thread pitch once and for all!

Re: WTK: AAC 51T ACME thread pitch once and for all!

Re: WTK: AAC 51T ACME thread pitch once and for all!