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How to Measure a Ball Bearings
Feb 14 , 2022
How to Measure a Ball Bearings

Ideally, you should use a vernier calliper to measure the ball bearing due to some ball bearings having sizes to a decimal place but you can use a good quality rule to check the size.

To identify a ball bearing you will need three sizes, the outside size, the inside bore and also the thickness of the ball bearing.  Where a ball bearing has an extended race you will need two sizes for the thickness as well, the outside thickness and the thickness of the extended race including the ball bearing.

Insert the outer anvil of the calliper into the bore and open up the calliper until the ball bearing and calliper are a good fit for one another. You will now be able to read the value on the calliper (or ruler).

Measuring the outside diameter of a ball bearing, you must place the calliper jaws around the ball bearing and follow by closing it until it is a good fit (not tight). You can then proceed to read the value from the calliper.

Some ball bearings are also made from a different material. Some races are stainless steel, some have ceramic balls and some have open faces to allow fresh grease to be purged into them on frames where a grease port is fitted. These codes can be identified on the seals usually with identifications such as 2 RS meaning 2 Rubber Seals, BO for a Black Oxide finish and SS for Stainless Steel.
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