If the size is wrong simply send in your ring within 90 days of your purchase and we will resize.
Ring size 325.
Click here to download our practical ring size guide.
Download our ring size pdf.
The standard sizes used by o ring manufacturers in the united states are defined by aerospace standard as568b aerospace size standard for o rings.
Take your best guess and don t sweat it.
When printing make sure that you do not resize the page at all.
Print the ring sizer making sure that it is printed to actual size.
Women s rings are commonly between sizes 3 and 9 while men s rings are usually sized between 8 and 14.
This ring size method uses a tape measure approach with specific ring metrics.
We have several ways to help you determine the size of the ring you want.
Take your best guess.
Please follow the simple steps below to determine your ring size.
Cut out the ring sizer and open the slot where marked.
Choose your preferred sizing method.
Move the slider until the selected object fits between the boxes to help with proportions.
Selecting the i don t know option will allow you to select a ring size later.
We need to know the size of the ring early in the design process.
With the numbers facing out slip the tip of the ring sizer through the slot.
That document published by the society of automotive engineers sae lists the sizes of o rings in six series or groups in both inches and millimeters.
You will need to print it out and place it on a flat surface.
Select i don t know.
Select a size to buy standard and custom o rings from the world s largest inventory network or custom orders can be made within a few weeks.
If you have a ring that fits you can use this chart.