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Old 06-19-2016, 07:41 PM   #1
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Carriage bolt washers.


Normally, with carriage bolts I use only ONE washer behind the nut because of the square area just under the head of the bolt requires you to use a washer much larger than the bolt diameter.

Now I'm wondering which is correct. Do I need to put a washer under the head of the carriage bolt as well. I will be using 8 inch long X 1/2" inch bolts through 6"x6" posts. Thanks for the information.
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Old 06-19-2016, 08:30 PM   #2
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Carriage bolts are designed to pull the square head into the wood . You only use a washer on the nut end
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Old 06-19-2016, 08:50 PM   #3
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Re: Carriage bolt washers.


This is why I don't use carriage bolts on decks, you get much more bearing surface with regular hex bolts and washers on both sides. With carriage bolts I find the head is too small to prevent the head from cutting into the wood, esp fresh damp PT.
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Old 06-20-2016, 09:45 AM   #4
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Re: Carriage bolt washers.


Quote:
Originally Posted by jimn01 View Post
Carriage bolts are designed to pull the square head into the wood . You only use a washer on the nut end
Quote:
Originally Posted by ChuckF. View Post
This is why I don't use carriage bolts on decks, you get much more bearing surface with regular hex bolts and washers on both sides. With carriage bolts I find the head is too small to prevent the head from cutting into the wood, esp fresh damp PT.
ChuckF- I'm using the carriage bolts on some very heavy framing of a Post & Beam barn. Carriage bolts are needed because the finish siding of the building will be over the bolt heads so I need a relatively flat head surface. I can't get a flat surface with a hex bolt. But I do agree with you that hex bolts with a washer under the head will prevent the bolt from sinking.
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Old 06-20-2016, 10:04 AM   #5
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Re: Carriage bolt washers.


You can get a flat surface with hex bolts by countersinking the bolt head flush with the face of the post. Looks good, and it is much easier to tighten or remove a hex bolt than a carriage bolt after a few years, since you can get a wrench on both sides of the hex bolt. When I countersink, I use a forstner bit to make the countersink holes, large enough to fit a wrench or socket in place.
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Old 06-20-2016, 10:22 AM   #6
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Re: Carriage bolt washers.


A minor detail Daniel; to avoid any potential confusion do you mean counter-bore, not counter-sink?

Cheers
Chris

Last edited by spiragui; 06-20-2016 at 10:23 AM. Reason: Typo
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Old 06-20-2016, 11:08 AM   #7
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Re: Carriage bolt washers.


Never really thought about it, but yes I mean counter bore.
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