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What Size Wood Screws To Use

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The column on the right shows the size of the pilot hole to be drilled for starting the screw. These screws should be at least 12 inch in diameter if they will support the weight of the deck and the point should sink at least 1 12 inches into the stationary member.

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The most common gauges are between 2 and 16 in diameter.

What size wood screws to use. The other factor is the screws diameter or gauge. As a general guideline you can use 8 diameter deck type screws for most utility tasks. Likewise there are tapered bits meant to drill pilot holes for wood screws.

When screwing into the end grain aim for at least two inches of thread in the board. The general rule of thumb is that the screw should enter at least half the thickness of the bottom material eg. A screws diameter is called its gauge.

Use 1 14 inch screws for basic tasks where strength is less of an issue or when attaching two 34 inch thick boards across the grain. This isnt something people pay much attention to in most cases but a real wood screw is tapered the shaft isnt uniform in diameter. An 8 gauge screw is a good general purpose size.

Thus 4 inches would be the minimum length of a lag bolt used to attach a 2 inch board. To screw through one 2×4 into another you would need a 2 78 inch screw with no thread for 1 916 inches. 34 into a 2 x 4.

I find them really handy especially for repetitive work like fences and decks. Heavy materials require a gauge of 12 to 14. Wood screws have been in use for centuries usually serving a simple but essential purpose.

Screws that measure 2 12 inches are more appropriate for two by fours placed flat allowing you to bury the head as needed. It might seem appropriate to use 3 inch screws but modern drilldrivers and impact drivers bury the head of the screw up to 12 inch and the tip of a 3 inch screw can penetrate out the other side. Here well take a look at the different types and uses of wood screws including how to properly size them for your needs.

This chart is designed for flat head screws but can be used for any type. Recommended screw length 1 14 32mm 34 19mm material 34 19mm material the charts below helps to select the correct screw type when joining like thicknesses of wood ie. If you use a good wood glue as well it will be much stronger.

Joining two pieces of wood together. For instance a screw for your use would be 1 38 inches long with no thread on the top 1316 inches of screw. Use this screw selection chart for selecting the correct size and length of screw for any job.

Fine applications such as woodworking may require a 6.

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