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Old 05-27-2009, 04:01 PM   #1
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Default Do AEBS and ARP use the same head stud nuts?

So my vendor is telling me it would be cheaper and faster to find a set of nuts on my own. I have the AEBS nuts and apparently when i first installed and torqued them, i used the wrong socket and rounded the 12points.

I now know that the AEBS nuts are 1/2". I called Don, he said the ARP's he has used were also 1/2".

However, I called ARP and they said the nuts are a 12x1.25mm and use a 14mm socket size.

I'm at a loss here on what to order....and i need to order them and have them here before my head gasket arrives.

Thanks.
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Old 05-27-2009, 05:32 PM   #2
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Default Re: Do AEBS and ARP use the same head stud nuts?

All the ARP and GE head stud nuts I have here are 1/2 or 13mm 12 points for the socket. What did Race Engineering say? They should have had a set of nuts.
I think they are 11mmX1.25 not 12mm studs.
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Old 05-27-2009, 05:37 PM   #3
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Default Re: Do AEBS and ARP use the same head stud nuts?

Quote:
Originally Posted by DonF View Post
All the ARP and GE head stud nuts I have here are 1/2 or 13mm 12 points for the socket. What did Race Engineering say? They should have had a set of nuts.
I think they are 11mmX1.25 not 12mm studs.
i guess they werent open.
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Old 05-27-2009, 05:40 PM   #4
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Default Re: Do AEBS and ARP use the same head stud nuts?

i have a set of h22 AEBS nuts here and i use a 1/2" 12point socket. i also have a h22 arp head studs here and it uses a 9/16" or 14mm socket
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Old 05-27-2009, 06:47 PM   #5
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Default Re: Do AEBS and ARP use the same head stud nuts?

Quote:
Originally Posted by FLATBUSH PROJECTS View Post
i have a set of h22 AEBS nuts here and i use a 1/2" 12point socket. i also have a h22 arp head studs here and it uses a 9/16" or 14mm socket
do they have the same thread pitch and ID?
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Old 05-27-2009, 09:28 PM   #6
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Default Re: Do AEBS and ARP use the same head stud nuts?

these are b-series vtec headstuds set of ARP and AEBS
nut thread is m11x1.25
either nuts will work on either stud
these nuts use a 13mm 12pt socket, im sure a 1/2" 12pt is close to a 13mm thats why some people say 1/2" 12pt socket

Click the image to open in full size.
ARP on left AEBS on right side view
Click the image to open in full size.
ARP on left AEBS on right thread view
Click the image to open in full size.
ARP on bottom AEBS on top, ARP stud
Click the image to open in full size.
ARP on bottom AEBS on top, showing ARP stud
Click the image to open in full size.
threads on smoothlY!
the bottom of the nuts are visually virtually the same, both flat faced

the ARP nut appears rounded but that is not done by me, just received this way
this could be the use of the wrong size socket
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Old 05-30-2009, 12:47 PM   #7
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Default Re: Do AEBS and ARP use the same head stud nuts?

thanks a lot man! that really helps. Finally i can order them.
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Old 05-30-2009, 12:56 PM   #8
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Default Re: Do AEBS and ARP use the same head stud nuts?

ok im looking and i cannot find an arp nut with 11x1.25 thread size. Ive looked in Jegs and Summit.

http://www.jegs.com/p/ARP/ARP-Replac...52063/10002/-1
http://store.summitracing.com/egnsea...0&NeXID=100740
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Old 05-30-2009, 01:24 PM   #9
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Default Re: Do AEBS and ARP use the same head stud nuts?

M11 doesn't come in 1.25mm unless it's custom, which is unlikely it's probably M12 x 1.25 or M11 x 1.
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Old 05-30-2009, 01:26 PM   #10
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Default Re: Do AEBS and ARP use the same head stud nuts?

well arp said it was 12x1.25 so i guess i will just trust them lol
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Old 05-30-2009, 02:19 PM   #11
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Default Re: Do AEBS and ARP use the same head stud nuts?

Edit: oops, not m12.

Last edited by ZoRG; 05-31-2009 at 01:49 PM.
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Old 05-30-2009, 03:45 PM   #12
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Default Re: Do AEBS and ARP use the same head stud nuts?

Guess i need to toss all my mikes and vernier calipers away as they are all fooocked up and measure 11mm. I guess i will also toss my 2 time-sert kits for honda's away also. They are for 11X 1.5 threads. Damn i have to recall all those repairs, and blocks with 11mm ARP head studs. 10 + years down the drain.
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Old 05-30-2009, 06:32 PM   #13
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Default Re: Do AEBS and ARP use the same head stud nuts?

Quote:
Originally Posted by DonF View Post
Guess i need to toss all my mikes and vernier calipers away as they are all fooocked up and measure 11mm. I guess i will also toss my 2 time-sert kits for honda's away also. They are for 11X 1.5 threads. Damn i have to recall all those repairs, and blocks with 11mm ARP head studs. 10 + years down the drain.
I think he's right. I got curious and had a set close by...

Click the image to open in full size.

Click the image to open in full size.

.431 give or take. Thats about 10.95mm These are for a B18C. That is what you guys are talking about right.

Edit: I just read the thread size on the ARP nut itself. It says 7/16-20.

Last edited by dlaub25; 05-30-2009 at 07:27 PM.
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Old 05-30-2009, 09:49 PM   #14
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Default Re: Do AEBS and ARP use the same head stud nuts?

well whatever, i ordered the 12x1.25mm from summit. If they are wrong, i will return them for the next size failure.

this is ****ing ridiculous
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Old 05-31-2009, 06:18 AM   #15
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Default Re: Do AEBS and ARP use the same head stud nuts?

why dont you call ARP and order directly from them?? i might be wrong but the threads from the studs that go into the block are different from the threads the nuts go onto...thats how it is for other cars....
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Old 05-31-2009, 07:16 AM   #16
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Default Re: Do AEBS and ARP use the same head stud nuts?

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Originally Posted by punkrockkiel View Post
why dont you call ARP and order directly from them?? i might be wrong but the threads from the studs that go into the block are different from the threads the nuts go onto...thats how it is for other cars....
Correct, they don't thread in upside down.

To the OP:
Find someone with a thread pitch gauge (or buy one at the hardware store), measure the stud diameter and presto you have the specs for the nut you need.
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Old 05-31-2009, 02:58 PM   #17
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Default Re: Do AEBS and ARP use the same head stud nuts?

Quote:
Originally Posted by DonF View Post
Guess i need to toss all my mikes and vernier calipers away as they are all fooocked up and measure 11mm. I guess i will also toss my 2 time-sert kits for honda's away also. They are for 11X 1.5 threads. Damn i have to recall all those repairs, and blocks with 11mm ARP head studs. 10 + years down the drain.
Haha walked right into that one... oops, sorry.
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Old 05-31-2009, 03:31 PM   #18
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Default Re: Do AEBS and ARP use the same head stud nuts?

Quote:
Originally Posted by punkrockkiel View Post
why dont you call ARP and order directly from them?? i might be wrong but the threads from the studs that go into the block are different from the threads the nuts go onto...thats how it is for other cars....
i did, i explained the situation to them and they said 12x1.25. Show me anywhere where they make and advertise one of their nuts as 11x1.5 or 11x1.25
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Old 05-31-2009, 03:46 PM   #19
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Default Re: Do AEBS and ARP use the same head stud nuts?

it would have also helped if aebs had a contact number instead of an email address that doesnt even work.
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Old 06-03-2009, 11:09 AM   #20
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Default Re: Do AEBS and ARP use the same head stud nuts?

ok well i got the nuts today. I called arp again to reassure myself. I gave them the part number of the package and they said it is the correct nut for their stud - 12mmx1.25
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Old 06-04-2009, 05:25 AM   #21
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Default Re: Do AEBS and ARP use the same head stud nuts?

Quote:
Originally Posted by 98vtec View Post
ok well i got the nuts today. I called arp again to reassure myself. I gave them the part number of the package and they said it is the correct nut for their stud - 12mmx1.25
Do they fit? It is possible that there is a STD thread on that end as dlaub25 mentioned.
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Old 06-04-2009, 02:27 PM   #22
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Default Re: Do AEBS and ARP use the same head stud nuts?

i wont find out til next week when the new head goes on
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Old 06-04-2009, 05:39 PM   #23
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Default Re: Do AEBS and ARP use the same head stud nuts?

I forgot you are doing H22 studs and you did not mention that, they may be 12mm. Bseries are 11 mm, D series 10mm. ARP and AEBS should be the same.
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