Stock tow hook bolt size and length - JeepForum.com
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post #1 of 18 Old 09-22-2017, 12:35 AM Thread Starter
Guy_Van_Horn
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Stock tow hook bolt size and length

I'm looking into putting some OEM tow hooks on the front of my `99 TJ. I've figured that they are T55 torx button head, but I'm not sure if they are 1/2"-13X2.00" or M12X60mm. The ones I have on right now are ~35mm long without the hooks, so that leads me to believe they are M12X60mm. Can anyone verify this?
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post #2 of 18 Old 09-22-2017, 02:07 AM
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Not having any luck finding the specs listed for the bolts, but they're part number 06036060AA or 6036060AA if that helps... looks like there are a decent number of places that still have them for sale online.
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post #3 of 18 Old 09-22-2017, 04:36 AM
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Just take one of the short ones out and take to home depot or any fastener place,. I would NOT get a Torx head,.. Get a regular bolt... way easier to find a socket to get the bolt in and out later., Less likely to strip out.... Or require a expensive tool to remove..
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post #4 of 18 Old 09-22-2017, 07:15 AM
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Quote:
Originally Posted by Guy_Van_Horn View Post
I'm looking into putting some OEM tow hooks on the front of my `99 TJ. I've figured that they are T55 torx button head, but I'm not sure if they are 1/2"-13X2.00" or 12mmX60mm. The ones I have on right now are ~35mm long without the hooks, so that leads me to believe they are M12X60mm. Can anyone verify this?
Thanks.

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The weld nuts in the frame for the front tow hooks are 1/2-13 thread. Bolt length should be determined by adding the thickness of the tow hook and another inch of length to fully engage the weld nut's threads taking into account the washer under the head if used, the thickness of the bumper etc. Don't overestimate and get a bolt with a shank that has enough unthreaded section that it bottoms out on the weld nut threads before it gets tight.
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post #5 of 18 Old 09-22-2017, 07:54 AM
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Are all TJs 1/2" thread on those bolts, or did the late models change to metric?
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post #6 of 18 Old 09-22-2017, 08:43 AM
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Originally Posted by NotURMailman View Post
Are all TJs 1/2" thread on those bolts, or did the late models change to metric?
They're all 1/2x13. Use Grade 8 strength.
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post #7 of 18 Old 09-22-2017, 10:22 AM Thread Starter
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Thank guys. I just ended up buying a pair of OEM tow hooks off ebay that had the bolts included, so I'll measure them and report back here when they arrive.

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post #8 of 18 Old 09-26-2017, 12:58 PM Thread Starter
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So they're ~2.5" long, and they are SAE grade 5, in case anyone wants to know.

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post #9 of 18 Old 09-26-2017, 01:10 PM
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Quote:
Originally Posted by Guy_Van_Horn View Post
So they're ~2.5" long, and they are SAE grade 5, in case anyone wants to know.
Grade 5 in that position has been known to bend in some harder pulls, that's why I recommended Grade 8 above.

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post #10 of 18 Old 09-26-2017, 01:27 PM Thread Starter
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Quote:
Originally Posted by Jerry Bransford View Post
Grade 5 in that position has been known to bend in some harder pulls, that's why I recommended Grade 8 above.
I don't doubt you, I'm just reporting what the OEM bolts are. Thank you.

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post #11 of 18 Old 09-26-2017, 02:44 PM
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Quote:
Originally Posted by Guy_Van_Horn View Post
So they're ~2.5" long, and they are SAE grade 5, in case anyone wants to know.

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They are the Torx large pan head, correct?

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post #12 of 18 Old 09-26-2017, 02:57 PM Thread Starter
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Yes, T55 torx drive, and 1/2-13UNC thread size like Jerry said previously.

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post #13 of 18 Old 09-26-2017, 03:33 PM
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Originally Posted by Guy_Van_Horn View Post
Yes, T55 torx drive, and 1/2-13UNC thread size like Jerry said previously.

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I had the chart at one time that showed what the markings on those bolts meant. Did you find one that showed how to tell they are grade 5?

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post #14 of 18 Old 09-26-2017, 04:28 PM Thread Starter
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Well, not as definitively as I would have liked, but it's probably correct. The shorter ~1.5" long bolts have three equally spaced radial hash marks. That is clearly SAE grade 5. The longer ~2.5" bolts used with the tow hooks have 4 dots right next to each other. I spoke to a guy at Fastenal, and he tells me that they looked those markings up before, and confirmed they also mean SAE grade 5. I wish I had a copy of SAE J429, because it probably identifies the dots as an acceptable alternative marking for grade 5. I'll keep looking.
Edit: so I did find at least an excerpt from SAE J429-2011, and it does show the radial hash head markings that I'm sure we're all familiar with. However the four dot marks are not there. At least in the excerpted pages I found. I'm wondering if since these are button head, torx drive bolts, if they are controlled by a different SAE standard. I already looked in ASTM F835, and it's not defined there.
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post #15 of 18 Old 09-26-2017, 04:45 PM
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Quote:
Originally Posted by mrblaine View Post
I had the chart at one time that showed what the markings on those bolts meant. Did you find one that showed how to tell they are grade 5?
Number of Hashes +2 = SAE bolt grade.



I find nothing on bolts marked with dots.

Got a picture of the head?
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