Identifying sizes can be tricky if you don’t know how to read them. Keep in mind that when purchasing ones with measurements that are listed in the metric system, the initial number is the diameter. If you are using the metric system, use the cm or mm side of the ruler to measure the diameter. The diameter in the imperial system is represented in either fraction of an inch or a gauge number.
Using a ruler or measuring tape, get the measurement from one side of a thread to the other to get the diameter. In other words, the gap in between each thread is 0.250 inches, and it has a Thread Per Inch (TPI) of four. If there are four thread gaps in a one-inch length, the thread pitch would be 0.250 inches (one inch / 4 thread gaps = 0.250 inches).
Once you have these values, you can now divide the length by the number of thread gaps. Within one inch of the length, count the number of thread gaps. For accuracy, count the first thread as zero. Now that you know how to take the measurement, the next step is to place the ruler down the axis to get the thread count. Hex head ones are an exception to this rule, which means you need to measure from the bottom of the head. Ones with a flat or oval head should be measured from the top to the tip. Ones with a pan, round, or truss head should be measured from the bottom of the head to the tip. In some cases, you may need to hang it off the edge of a surface to lay it flat. Start measuring wherever the head would rest when fully embedded into something. The first step in measuring the length is finding a surface to lay it down on an even surface. A ruler is all you need to determine thread count and size. If the measurement says 1/4-20, it means it has a diameter of 1/4 inch and 20 threads per inch. To measure screw size, we take its diameter. The number will also tell if a screw can thread through a bolt. We use the TPI to determine the thread’s fineness. The latter is also commonly referred to as threads per inch (TPI) or thread pitch. When looking into and determining screw size dimensions, there are two things you need to understand – the length and the thread count. These standards dictate things like thickness and screw thread. ASME is the organization that is in charge of a lot of the standardization work. Here’s the standard & metric screw size chart you need to help you find the right products at the shop! It doesn’t matter if you’re working outside or on furniture.
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