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Unread 06-03-2008, 07:17 AM   #1
witttom
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Mounting Tow Hitch, Need Thread Specs

I bought a hitch/receiver off eBay last week, for my 96 Grand Cherokee. It's a nice hitch. When it arrived, I was installing it within minutes (grabbed it off the UPS truck, walked 10ft and started working on it). It mounts using the four studs on the back of the frame and two tapped holes further forward. Threaded the 12mm nuts on the existing studs, not a problem. However, getting the 12mm bolts to start has been impossible. I was convinced that the bolts they sent me were too big. I went to the hardware store and bought 11mm. Threads fine, but I can tell it is too small (small amount of play). So then I start second guessing myself. I try the 12mm again. For the life of me, I just can't get them to start. They appear too big. I contacted the hitch people. I play phone/email tag back and fourth for several days. This morning they say that it's common that the threads rust up, and that I need a 12mm tap to clean them up. Are these threads really 12mm, or am I about to tap something else and MAKE them 12mm??

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Unread 06-03-2008, 09:01 PM   #2
FPKites
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I'm not positive, but I wouldn't re-tap. There's a distinct possibility that the bolts are SAE and not metric.
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Unread 06-03-2008, 09:12 PM   #3
witttom
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Originally Posted by FPKites View Post
I'm not positive, but I wouldn't re-tap. There's a distinct possibility that the bolts are SAE and not metric.
I re-tapped. I believe they indeed were 12mm. The 4 studs were 12mm, and I believe the two tapped holes were too, but just so badly corroded/rusted that they had closed up a bit. I cleaned them up with a 12mm tap (one of them was much worse than the other) and threaded the bolts in. I think I'm in good shape now.
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Unread 06-03-2008, 09:22 PM   #4
FPKites
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Glad you got it figured out.
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