What Does The Rectangle Under The Head Of Carriage Bolt Do? - Building & Construction - DIY Chatroom Home Improvement Forum
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Old 06-13-2009, 01:18 PM   #1
 
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What does the rectangle under the head of carriage bolt do?


Anyone know? You have the head of the bolt and then a rectangle under it followed by the threads
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Old 06-13-2009, 01:32 PM   #2
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Post deleted.

Last edited by Ron6519; 06-13-2009 at 01:46 PM. Reason: Poster
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Old 06-13-2009, 02:09 PM   #3
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Usually this fits into a square slot that prevents the bolt from turning



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Old 06-13-2009, 04:30 PM   #4
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Aw Yeah,like Scuba Dave said. Carriage bolts are used where you cant( or can't easily) get a tool on the back side of the fastener to hold against your tightening of the nut. The "rectangle" in the slot does the holding that would normally be done by wrench or pliers.
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Old 06-13-2009, 04:32 PM   #5
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Oh Yeah. Really it's a square,no?
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Old 06-13-2009, 08:35 PM   #6
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in wood applications, they are usually used in a tight tolerence round hole. as you tighten the nut, the square portion embeds itself into the wood, keeping the head end from spinning. They also sell special washers the have a square cut out and "teeth" on the outer edges ( like a t-nut). You hammer the washer over a hole, and the square shoulder sits in the square cut inner hole.
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Old 06-13-2009, 08:41 PM   #7
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Yup, I used those washers when I built my 8' picanic table



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