Comangi Posted January 31, 2015 Share Posted January 31, 2015 Tried to replace my wheel hub on my 86 MJ today. The two 13MM bolts that hold the caliper to the knuckle stripped out. Had to use heat and a smaller socket. Nowhere carries these bolts, I call and ask for a caliper bolt, they call it a caliper guide pin? What is the name of this bolt? Even more importantly, where do i get a pair? Thanks! Link to comment Share on other sites More sharing options...
Dillithium Posted January 31, 2015 Share Posted January 31, 2015 Rockauto has them. Link to comment Share on other sites More sharing options...
Eagle Posted January 31, 2015 Share Posted January 31, 2015 The factory parts manual just calls is "Bolt" -- part number 3420 1506 Link to comment Share on other sites More sharing options...
Comangi Posted January 31, 2015 Author Share Posted January 31, 2015 Rock auto does not have these bolts, not unless I'm blind. Also, that part number doesn't bring anything up. How complicated can this be? Nowhere has these things. Link to comment Share on other sites More sharing options...
8valvehero Posted January 31, 2015 Share Posted January 31, 2015 just get a similar bolt and cut it off to the correct length Link to comment Share on other sites More sharing options...
Comangi Posted January 31, 2015 Author Share Posted January 31, 2015 tried that, the thread somehow didn't match. Link to comment Share on other sites More sharing options...
gogmorgo Posted January 31, 2015 Share Posted January 31, 2015 There are two "bolts" you could be referring to. Which one is it? There's a bolt that holds the caliper to the caliper bracket. This is the guide pin. It's available on RockAuto, and called the Caliper Guide Pin, under Brake/Wheel Hub. There's also the bolt that holds the caliper bracket to the steering knuckle. This is the one Eagle's talking about. I can't find it on Rock Auto either. I understand there was a steering knuckle change somewhere in there, but my '91 4x4 doesn't need the caliper brackets removed to swap the hubs, so I'm ASSuming this isn't the bolt you're looking for. But you never know. What did you try to replace it with? A quick google search of Eagle's part number suggests that the bolt size is M12x1.25x35mm, grade 10.9 (the Metric equivalent to grade 8). You need to match the treads, you can't just expect any old bolt to work. Link to comment Share on other sites More sharing options...
Comangi Posted January 31, 2015 Author Share Posted January 31, 2015 went to the hardware store and turns out I had the thread pitch wrong..... got it to work. The stock bolts are discontinued, you can;t get them anymore. Let this be a lesson, do what you must to keep from stripping those bolts! Edit: from up above, it's the caliper bracket to knuckle. You're right, M12X35, 1.25 pitch. I had a 1.30 for some reason. must have grabbed the wrong one out of the drawer. Sat under the truck like a dummy trying to thread it..... Link to comment Share on other sites More sharing options...
sinkrun Posted February 1, 2015 Share Posted February 1, 2015 Metric threads suck so little difference in pitch. Link to comment Share on other sites More sharing options...
Motorcharge Posted February 1, 2015 Share Posted February 1, 2015 Call a Jeep dealer and see if you can't still get them. They might be discontinued but the dealer by me still has a lot of older parts in stock. Hell, they even had shackle bolts still when I needed to replace them on my XJ a couple years ago. At that point Jeep hadn't built anything with leaf springs in over a decade. If that doesn't work you can always go to a local pick n pull and just get some off an XJ. Link to comment Share on other sites More sharing options...
Rockfrog Posted February 8, 2015 Share Posted February 8, 2015 One could always drill/retap to the next available size (in either metric or SAE) ... Use a Gr8 or 10.9 or better bolt and call it done. M12 is close to 1/2" (1/2" is 12.7mm) so that would be the first option, use 1/2-20 and call it done. Link to comment Share on other sites More sharing options...
xjrev10 Posted February 9, 2015 Share Posted February 9, 2015 Call a Jeep dealer and see if you can't still get them. They might be discontinued but the dealer by me still has a lot of older parts in stock. Hell, they even had shackle bolts still when I needed to replace them on my XJ a couple years ago. At that point Jeep hadn't built anything with leaf springs in over a decade. If that doesn't work you can always go to a local pick n pull and just get some off an XJ. Are the parts in the database? Link to comment Share on other sites More sharing options...
Axeminister Posted March 25, 2017 Share Posted March 25, 2017 ANSWER: FREE FREE FREE I had these bolts strips on me, just too soft and seized from age. I took it to my local TCAT school(vocational/technical school) where they teach machine tool technology. They can put a metric or standard on it and its done by a precision machine that makes it a perfectly machined head that will fit a size or two down. They then dipped it in a hardener to firm the metal back up so it wouldnt strip again. If you strip these bolts you cannot(maybe rarely) get them conventionally(internet, parts stores, dealership). Not all is lost, find a machine shop or trade school and they will either fix the head or make a new bolt. In my case: don't let them get ahead of themselves and make a brand new bolt before trying to fix the head, they are students and eager but a new head is the way that fixed me up and it took under 24 hours. If they do need to make an new bolt the sizes above are correct M12x1.25x35mm, grade 10.9 If anyone does not have access to a facility of this type PM me and ill be glad to help by mail or other. -Axe Link to comment Share on other sites More sharing options...
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