![]() ![]() In our metric screw size chart, you’ll find all the information you need to buy the right size of screws for your project. The Only Metric Screw Size Chart You’ll Need ![]() What about the thread per inch number? In this case, it means that the screw has the standard number of threads. These two numbers are the gauge number and screw length. Pro-tip, you might find some imperial callouts that contain only two numbers. The third and final number is the screw’s length which equals ½ inch.The second number represents the number of threads per inch which is 1.The first number represents the US gauge number which equals 6 inches.Since we also talked about imperial screw callouts, let’s read this screw thread callout as well: The third and final number is the screw’s length which equals 30 mm.The second number is the screw’s pitch which equals 1.25 mm.The first number after the letter M is the screw diameter which equals 3 mm.To make sure that you understand how to read metric callouts on screw packages, let’s try to read this metric machine screw callout: To understand how to choose the right screw length for your project, check out this video:Įxample: Reading Metric Machine Screw Sizes So, the screw length in this case is measured from beneath the head to the tip. On the other hand, non-countersinking threads are designed so that their heads remain above the surface. This is because they’re designed to be installed flat or flush with the surface. It’s measured differently depending on the type of the screw head.įor countersinking screws, their length is measured from the top of their heads to their tips. The screw length is the third and final number you find in metric callouts. In our metric screw size chart, we provide the pitch for both coarse and fine threads. So, of course, the pitch number will be different between the two. While a fine screw has a high number of threads. One for coarse screws and the other for fine screws.Ī coarse screw is a screw with a low number of threads along the screw. In metric screw sizes, you usually find the screw pitch represented in the second column. Instead, you’ll find the number of threads per inch (TPI). ![]() You can find that the screw pitch isn’t included in imperial callouts. It represents the distance between each thread on the screw in mm. The screw pitch is represented by the second number you see in the callout. You’ll usually find the screw diameter in mm in the first column of any metric screw size chart 2. However, we could say that the screw diameter in mm is approximately half the gauge. It’s really complicated to understand the coloration between metric screw diameter and gauge. Just because they’re both written as the first numbers in callouts, doesn’t mean that they’re the same thing. In other terms, it’s the diameter of the screw shank.ĭon’t get it confused with the US gauge. The screw diameter or major diameter is the outside diameter of the screw. Unlike imperial callouts, the metric screw size callouts always start with the letter M followed by a number. We’ll be explaining each definition of these to help you read our metric screw size chart. Typically, screw callouts contain three numbers whether for imperial or metric ones. How to Read Metric Screw Sizes?Ī metric callout on a screw package usually looks like this: M6 × 1.00 × 25. This will help you use our metric screw size chart that is included further in the article. So, we’ll be starting by explaining how to read metric screw callouts first. Thus, metric screw size charts will have different info than what is provided in imperial charts. ![]() Metric callouts look different from imperial ones. If you’re used to using the imperial screw sizes, reading screw sizes in mm might be confusing to you. Let’s get started! Terms You Must Know to Read Metric Screw Size Charts We also included an easy-to-follow metric screw size chart. In this article, you’ll find all the information you need to read metric screw sizes easily. So, it’s important to familiarize yourself with both of them. However, you can find some screw packages that are available in metric sizes only. You also might be familiar with reading imperial screw callouts. Once you figure out the meaning of each number found in screw callouts, you’ll find that reading callouts and screw size charts is a piece of cake. Whether you’re buying screws online or in-store, if you don’t know how to read screw callouts, you’ll probably end up getting the wrong size.Īlthough it might seem hard to understand screw sizes, it’s actually a lot simpler than what you think. ![]()
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