How To Determine Bolt Size From Hole

Step 1 use a bolt gauge to find the diameter quickly and easily.

All you need to know about bolts measuring a fastener. In the value type list select bolt size. That means the vehicle has 4 bolt holes and a diameter of 130 millimetres 5 1 in. Also called major diameter.

For example a 1 4 inch diameter bolt with 20 threads per inch is designated as a 1 4 20 bolt. Press the threads of the bolt against the gauge. Move the bolt to the thread section of the gauge. Slide the bolt into an opening of a bolt and thread gauge.

To determine the bolt size with the help of the measurement scale you have to place the scale on top of the hole you want to measure. Typically bcd is quoted for bash guards covering the chain wheels on bikes and you can calculate it by measuring the distance between the fixing holes of the chain ring. So placing one on top of the hole can tell you the size. Modify the first variable as follows.

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The diameter of the circle on which the holes will be evenly distributed. Inches are measured threads per inches. Push the bolt into the holes on the gauge and find the smallest hole the bolt will fit into 1 x research source check more than once to ensure the bolt cannot fit into a smaller hole step 2 use a ruler to measure diameter if you don t have a bolt gauge. The diameter of a bolt is the shank diameter expressed in millimetres for metric bolts.

Because this is approximately the same as the major or thread diameter the thread diameter measurement can be used for fully threaded bolts. Usually the metric holes are in the top row and the standard holes are in the bottom row. Bolts running through steel beam. These scale comes up with many holes in it according to the shape and with also the number of the bolt size.

An example bolt pattern size could look like. 4 x 130 millimetres 5 1 in. Provide the diameter in either inches or millimeters depending on where you purchase your wheels. Your best bet is to buy a complete set of nut and bolt thread checkers which come in individual pieces for each size as well as male and female options making them ideal for figuring out the bolt size needed on big machinery with not a lot of room to work with.

A bolt gauge is divided into standard and metric sections. How to determine bolt size from hole. When the threads sit even with the thread gauge you have the correct threads per inch of the bolt. Third measure length length is measured from behind the head to end except for flathead is measured total length.