Jul 18, 2017 How to Figure Out the Size of Screws, Bolts, and Nuts Craig Lloyd @craigelloyd July 18, 2017, pm EDT If you have some stray screws and bolts (a.k.a. fasteners) lying around and aren’t quite sure what size they are, or if you need to replace a missing bolt on a piece of machinery and need to know what size to get, Sep 12, 2015 One of the most obvious things that will determine the type of screw you should use in terms of size is the load that it will bear. When producing an item that will need to bear huge loads or which will be exposed to great forces, you will definitely need to get bolts and nuts … How to Determine Screw Size Thread Count. This number will help you determine whether a screw will thread into a certain bolt properly. Screw size is measured in diameter. For example a 1/4-20 screw has 20 threads per inch and a diameter of 1/4 inch. All you need is a steel rule to determine the size and thread count of any screw .

In the example, this is 4 inches. Determine the grade of the bolt. The grade describes the grade of metal or the type of material used to manufacture the bolt. The grade of the bolt may be indicated by markings on the head. In the example, Grade 2 signifies a soft steel was used to make the bolt. How to Measure Nuts Bolts . Step 1 Place the head of a bolt or a nut into a nut and bolt gauge. Nut and bolt gauges are available in most hardware and automotive parts heree in both metric and standard sizing. One hole of the gauge will fit the bolt head or nut snugly (be sure you're not mixing up metric and standard gauges). I have my nuts and bolts and screws etc. all sorted into separate labeled containers. So I grab a possible match out of one and test the unknown hardware against it, if I can't tell by just looking. I usually check though if I am tapping work or something, just you know, to make sure.

Thread Fit. UTS bolts that have diameters of less than 1/4 inch are provided gauge numbers, but inch measurements are used between 1/4 and 1 inch sizes . The second number of a UTS bolt designates the threads per inch (TPI). UTS bolts sizes between #0 and #10 have two possible TPI configurations (coarse and fine),. Cheat Guide Chart – Bolts, Screws, Washers, Nuts , Drive Charts Working on a project and trying to find the name of a special bolt type? We have the charts to help you identify the many different types of bolts and screws for just about any project.