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A carriage bolt head has several advantages relating to wood. First and foremost, it's a smoother surface. That head is fairly low-profile and ramped. That makes it less likely to snag things or people. When this is done to extremes, it is an elevator bolt, with a completely flat and slightly tapered head, designed to be pulled down to completely flush in ...


If the hole is the proper size, carriage bolts work fine in wood, both soft and hard. You'll generally crush the wood via over-tightening before you'll spin the bolt head in the wood. A friend teaches bookmaking and makes budget book clamps from carriage bolts and ordinary SPF 2x4s. I've never seen one of those spin out. They get cranked on pretty hard. Now, ...


Carriage bolts can be used in sheet metal with punched square holes, like for shelving or in wood. For similar functionality (one-sided tightening) in wood you could use tee nuts or spring washers or various furniture fasteners that work similarly but are embedded inside the wood for a better look.


Definitely use through bolts, both for strength and to provide a stress free clamping force. Large screws could end up splitting the tops of the post over time allowing water to penetrate an already vulnerable area, i.e. the end grain. If you can't find the right length bolts it is possible to use threaded bar with washers and nuts at each end. Personally, I ...

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