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Jump Ring Sizes and Gauges

Download and print this PDF to use as sizing chart to find the gauge and corresponding inside diameter (measured in millimeters) of your jump rings. 

Jump ring basics

The inside diameter (ID) of a jump ring is measured by the size of the mandrel used to make it. Some jump ring manufacturers use mandrels that are measured in fractional inches (such as 1⁄8 in.), while others use mandrels measured in millimeters, which usually come in quarter-millimeter increments. When choosing jump rings for a project, this can be confusing. For instance, if the project you’re working on calls for 15⁄64-in. jump rings and the vendor you’re buying from sells them in fractional inches, you’re good to go. But what if the ones you’re purchasing are measured in millimeters? How do you know what size rings to buy?  

This issue comes up primarily in chain mail projects in which the inside diameter of the jump rings often makes the difference between the project working or not. If, when you go to buy or make jump rings, you find that the measurement system is not the same as what the project designer used, consult the following charts. 

The first chart below starts with millimeter measurements with decimal inch equivalents. The next column shows the closest fractional inch ring size that you’ll be able to purchase along with the decimal inch equivalent.

The second chart below starts with the fractional inch measurements followed by the actual millimeter equivalent. The next column shows the closest millimeter ring size that you will be able to purchase.

jump ring chart 1
Chart 1
jump ring chart 2
Chart 2

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