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Old 09-19-2018, 12:27 AM   #1
KarlJS
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Default Bolt size

Does anybody know the bolt size for the rear light brackets on a 39í 1/2 ton truck? Mine are non existent and Iím wanting to run a tap to clean up the threads. Thanks
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Old 09-19-2018, 03:49 AM   #2
Mart
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Default Re: Bolt size

Mine is a 41 and just has coarse self tappers. If there are little inserts my money would be on them being 1/4 UNC.

You could try a bolt gently and see if it wants to start.

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Old 09-19-2018, 07:12 AM   #3
JSeery
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Default Re: Bolt size

I would start with a thread chaser. They can also be used to determine the thread size. If you purchase a set(s) keep in mind that they often come as a set of coarse and a set of fine threads. They are very handy when working on older cars.

Last edited by JSeery; 09-19-2018 at 07:22 AM.
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Old 09-19-2018, 09:09 AM   #4
Kube
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Default Re: Bolt size

Quote:
Originally Posted by KarlJS View Post
Does anybody know the bolt size for the rear light brackets on a 39í 1/2 ton truck? Mine are non existent and Iím wanting to run a tap to clean up the threads. Thanks
My '40 is 1/4 -20. I'd think '39 would be the same.
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Old 09-19-2018, 10:07 AM   #5
bosborn38pu
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Default Re: Bolt size

My '38 is 1/4 - 20 (w/cage nuts inside).
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