If the screw is from the fine series, it’ll have 36 threads per inch (#8-36 UNF). This screw will have 32 threads in a one-inch section of a coarse screw (#8-32 UNC). It’s specified right after the screw gauge. TPI stands for the number of threads per inch. Knowing this will help you know what drill bit sizes to use when drilling into wood, metal, plastics and any other material. If the screw has an outside diameter of 0.25 inches, the gauge size will be ¼”, and so on. #0 has an outside diameter of 0.06 inches, while #12 has an outside diameter of 0.216 inches.Īfter #12, the gauge size is labeled according to the outside diameter. The screw gauge is the diameter of the outside thread in inches, better referred to as the “major diameter.”Īnything less than ¼” will be labeled from #0 to #12. There’s also the extra-fine screw thread standard (UNEF), but it’s not as popular as the other two. There are two thread standards under the UTS chart: course (UNC) and fine (UNF). So, to sum up, here are six terms you should familiarize yourself with within the UTS system: This could come in handy if you’re converting from the metric system to the imperial system, but it’s not something that UTS screw charts generally have.įinally, the callout on the screws box may have a tolerance class number, the LH symbol if the screws are left-handed, and the screw length. Our extensive screw chart also specifies the screw pitch in inches, which is the distance between each thread. Whether you’re trying to read a screw chart or a screw label with the callout printed on it, you should familiarize yourself with both systems How to Read a UTS Screw Chart (Imperial System)Ī UTS screw chart will typically have three things: the screw gauge, the number of threads per inch (TPI), and the thread standard. This means that you’ll have to follow the standard screw sizes of ASME/ ANSI, which is called the Unified Thread Standard (UTS).Īll measurements in the UTS system are in inches.įor the rest of the world, you’ll probably be using the metric system, which follows the ISO screw thread standard. If you live in the United States, you’re among the three countries in the world that use the imperial system. Let’s get started! How to Read a Screw Chart I’m here to tell you that sizing the right screw doesn’t have to be guesswork anymore!īy the end of this guide, you’ll be able to confidently read a screw size chart and decipher all the measurements on a screw callout by yourself.įrom metric and imperial size standards to all the other related intricacies, I’ve got it all covered below. The first time you read the label on a box of screws, you’ll probably come across a lot of confusing numbers that seemingly don’t make any sense.
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