![]() Let’s say you’re working on a wood project that requires merging two pieces of wood together.įirst, you’ll have to determine the size of the wood screw you’re using by measuring the screw with a ruler. Real-Life Wood Screw Size Chart Application If the threading of a screw and nut are different, they’re either strip or seize the threading, resulting in improper and unusable connection. In general, higher-value TPI indicates a smaller thread pitch. The wood screw’s threads per inch (TPI) ensure that the screw matches the part you’re inserting it into. Double-Check the Screw’s Threads Per Inch Roundhead screws have a domed, round top and a flat head underside. Oval head screws have a decorative top that slightly protrudes above the surface, but features the same conically-shaped underside. To accurately determine the head size, you’ll have to determine what head type your wood screw has.įlathead wood screws, as the name suggests, have a flat top and a conically-shaped (cone-like) underside. The head diameter measures the upper part of the screw. On the other hand, the shank diameter measures the threadless part of the bolt between the thread and the head. The minor diameter, also known as root diameter (RD), measures the smallest diameter of the screw thread. The next set of columns corresponds to the appropriate diameter in both fractional and decimal measurements. Once you’ve determined the wood screw size, check the wood screw’s minor, shank, and average head diameter. Then, consult the table below to determine the nearest fractional size of the screw you’ve just measured: Screw Size If you don’t have the box, determine the size of your wood screw by manually measuring the width of a thread-in fractions of an inch-to get the diameter. Usually, the manufacturers list the wood screw gauge in the box itself. The length and diameter, both of which are measured in inches, belong to a gauge group from 0 to 24. This is the same for any kind of screw size chart you’re using and it’s very useful! The size of a wood screw is determined by two major factors: shaft length and thickness/diameter. Here’s how to properly read a wood screw size chart to help you choose the right wood screws: Measure the Wood Screw Size It also allows for a stronger, firmer hold overall. The partially threaded design prevents the screws from turning when the thread runs out and protects the wooden material from splitting or cracking if the screws are driven in too far. The threads are usually only up to an inch in length. They have coarser threads with smooth shanks below the head. ![]() Unlike metal-working screws, wood screws aren’t threaded throughout. Wood screws serve a simple yet important purpose: securing two solid pieces of wood together without the need for cut joinery. ![]() Let’s dive right in! How to Read a Wood Screw Size Chart In this article, you’ll learn how to read a wood screw size chart for all your wood screw needs. When using wood screws, it’s important to consult a wood screw size chart to guarantee you’re using the right size wood screws for your project. They’re especially suited for mounting trim and hardware, clamping forms, and building jigs. Used in indoor and outdoor applications alike, wood screws are excellent alternatives to nails and wooden clamps.
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