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Click on image for the lowdown. 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: May 2005 Posts: 8,983 Sir Searchalot | | Sir Searchalot Joined: May 2005 Posts: 8,983 | They are not for securing planks, they are the holes for attaching "bed" to the frame. As HB says, the counterbore (not countersink) hole locks the washer from spinning, the square on the bolt fits into square in washer to keep bolt from spinning.
Without the counterbore the washer would still spin. Bed wood companies can drill these for you. They are only used at the locations for tying to truck frame. You can buy a counterbore bit and do it yourself if you use the correct technique or a template.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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