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Old 11-15-2010, 02:34 AM   #1 (permalink)
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Autococker Bolt Size Guide - Once and For All

Alright, I am sick and tired of buying an autococker bolt from someone on here, only to have it not fit any of my cockers. So, for once, I would like to make a list of all the autococker bolt lengths in inches and which autococker versions they are compatible with.

Below I have posted all of my bolts with lengths (inches) and which guns they fit.




So, here are some of the measurements of my bolts:

5 5/8" - 5 11/16" will fit 98 STO / 99 STO / 97-99 EVO (with exceptions, see below)
6" will fit 2000 STO
6 5/16" will fit PMS Mark II (and other full size back block cockers)

Notice also that although bolts 1-6 appear to be basically the same length, bolt number 6 will NOT fit a 98-99 STO or a 97-99 EVO because the rear grip section of the bolt is much longer on 6 than on 1-5, which means the bolt will not line up with the bolt pin holes as seen here:

Maybe someone can explain what gun 6 fits...

Please list exactly what size bolt you have and what model autococker you have so we can compile a comprehensive list for reference. Once again, I have listed my results below. Thanks!


5 5/8" - 5 11/16" will fit 98 STO / 99 STO / 97-99 EVO (exception= #6 is '05 superstock length due to larger rear bolt grip)

6" will fit 2000 STO (Standard 2k - 2k4 length)

6 5/16" will fit PMS Mark II (and other full size back block cockers, usually older ones such as pre-2k)
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Last edited by KingAcquisitions; 11-15-2010 at 11:57 AM. Reason: update to list
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Old 11-15-2010, 02:46 AM   #2 (permalink)
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The overall length doesn't really make a difference because the back of the bolt past the bolt pin hole can vary. A better measurement might be from the tip of the bolt to the center of the bolt pin hole.
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Old 11-15-2010, 05:31 AM   #3 (permalink)
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Originally Posted by KingAcquisitions View Post
Alright, I am sick and

Maybe someone can explain what gun 6 fits...
it's the bolt you can find in a 05 Superstock.

nice job, it's always a pain to find the right bolt when building a Cocker...
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Old 11-15-2010, 05:52 AM   #4 (permalink)
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9 thru 12 are older cockers, which had thicker backblocks. Backblocks stuck out about 1" from the back. Newer ones are in the 1/2" area.

So all the varying you see in size is cause of all the different size backblocks. Which varied from manufactures.

As Mad Said
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Old 11-15-2010, 08:34 AM   #5 (permalink)
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#7 looks like a standard 2k-2k4 bolt.

that bottom one looks very weird, the hole for the bolt pin is a lot further forward than the ones near it, so I think its actual length (length between the bolt pin and the air inlet) is closer to normal 2k length.
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Old 11-15-2010, 12:00 PM   #6 (permalink)
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Alright, I just updated the list. Thanks for you input, I will also measure from the bolt pin holes to the front of the bolt ad MAD said.

PLEASE only post a reference length if you have tested it and measured it yourself! I want to keep the guessing on compatible models as minimal as possible.

Keep 'em coming!
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Old 11-15-2010, 02:26 PM   #7 (permalink)
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Could be useful to add a picture of the 3 major styles of the back ends / back blocks of cockers. (pre-2k, 2k+ and evo). What also gets a little wacky are the back blocks where the pin goes through the top. I think that #8 bolt is one but may have the holes for both top and side bolt pins.
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Old 01-12-2011, 11:42 AM   #8 (permalink)
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Great Presentation. I have been fortunate enough I accidentally always buy the right length. I always thought you had the mini bolt and standard bolt. Thanks for the eye opener.
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Old 01-12-2011, 11:45 AM   #9 (permalink)
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Looking again, # doesnt look like the stock 99 sto bolt I have sitting at home.
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Old 01-12-2011, 02:20 PM   #10 (permalink)
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The only one you're missing is work's P-block bolts. Those were between evo and 2k length.

Also - APBBolts.com (old Jam bolts maker) had some good info:

home

JAM Model Chart

Bolt Model Number

Pre 2000 WGP 0082
Karnivor, Pre 2000 Evolution, STO, New SFL 2050
2000 WGP, Black Magic, Oracle,Freeflow, 2000 STO 2000, 2002, 2004

Model JAM Bolt


Tip of bolt to back of pin hole

0082 5 1/2"
2000, 2002, 2004 5 1/4"
2050 4 13/16"
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