How to Choose the Right Jar Lid

A common question we get asked is about which jar lids fits which jam jars.


You probably have a lot of glass jars at home that you have either used for canning before or that you have used the contents of. We have a cupboard full of odd sized jars which we don't want to throw away. Just in case they find a purpose!


Unfortunately unlike jars. Jam jar lids aren't designed to be reused over and over again. And because of that. We've created this handy guide to help you choose the correct lid for the jars you have at home.


Once you know the size that fits your jar. Head over to our jar caps section to place your order.


How to measure jam jar lids

Twist Off vs Screw Top Caps


There are two main types of jar lids. Twist off and screw top.


Twist off caps are the most common that are found on most store bought jam and chutney jars. They aren't very tall. At usually 5-7mm. And require half a turn to undo them.


Screw top caps on the other hand are screwed on and tend to be taller to allow for the thread on the inside on the cap. These usually take 3-4 turns to undo them. And they can usually be found on mason and honey jars.


Which do you have at home? The difference is usually quite easy to spot!


Unfortunately our current stock of jam jar lids only cover the twist off variety. If you need screw top ones let us know and we will see what we can do!


twist off jar lids

Standard Sizes of Jam Jar Lids


When it comes to glass packaging it makes everyone's lives a lot easier when there are standard measurements in place. The same goes for twist off jar caps.


The standard sizes that can be found are 38, 43, 48, 53, 58, 63, 66, 70 and 82. These numbers refer to the diameter of the lid in millimetres.


Jam jar cap thread

How to Measure Jars For Jam Jar Lids


To measure which lid will fit your jar you will need to measure the thread of the jars opening. Simply measure from the outside of the thread as shown in the diagram below.


Jar lids aren't designed to be a tight fit so it might not match up with the standard measurements above. So if you measure 56-57mm you would need a 58mm lid.


The measurement of the jar is generally 1 or 2mm under the size of the lid. This allows for the thickness of the metal and the lugs that are used to secure the lid to the jar.


glass jar lid size


How to Measure The Lids


What if you still have the lid for your jar? This can be measured too!


You simply need the internal diameter of the lid. This is measured from the inside of the metal to the inside of the metal. As shown in the picture below. Again this might not be the exact size but it will only be 1 or 2 millimetres out. So it will let you know the size you need.

jam jar cap sizes

We hope you enjoyed our latest guide on how to choose the correct size lid for your glass jars. Did you find it helpful? Let us know in the comments below!


What other topics would you like to see us cover in our guides? Let us know and we will do our best to cover them for you.


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All the best


The team at Sen5es

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