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Old 09-06-2023, 02:29 PM   #1
Rg500gamma
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Common bolt thread sizes used on 72 k20 longbed

I'm curious as to what the most commonly used bolt sizes used .
I will need to get the appropriate tap/chasers for the truck to clean out the bolt holes after paint. Obviously I will tape any studs
Thanks all.
Apologies if there is a thread already posted. I did a quick search and found nothing
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Old 09-06-2023, 04:01 PM   #2
body bolt
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Re: Common bolt thread sizes used on 72 k20 longbed

3/8-16
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Old 09-06-2023, 07:31 PM   #3
Rg500gamma
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Re: Common bolt thread sizes used on 72 k20 longbed

Thank you.
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Old 09-06-2023, 10:27 PM   #4
mr.mud1
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Re: Common bolt thread sizes used on 72 k20 longbed

It does depend on what area of the truck you're working on.alot of the sheetmetal is attached with 5/16's coarse thread bolts,some 3/8's.on the engine,depending what engine,there will be 1/4, 5/16's, 3/8's, 7/16's and 1/2 inch coarse thread usually.if you buy or have a tap & die set with SAE standard taps,you'll have all those sizes you need.
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Old 09-06-2023, 11:26 PM   #5
RustyPile
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Re: Common bolt thread sizes used on 72 k20 longbed

If you buy just 2 - 3 sizes, you'll invariably need another size or two after you get started.. Taps and dies, bought individually can get expensive.. Go to Lowes and get this 11 size set..

https://www.lowes.com/pd/IRWIN-24-Pi...Set/1003018222

Last edited by RustyPile; 09-07-2023 at 08:38 AM. Reason: correct spelling
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