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Active Contributor

Join Date: Feb 2010
Posts: 20

Marks on the Outer Race of a New Bearing

11/23/2017 6:20 AM

I recently received a set of bearings (rolling element) for an application in one of my machines from a very reliable source that I had been procuring from for over a few years.

However, on inspection the outer race of the bearings were seen to have patterns/shading (but no indentations) that seemed like it has been installed in a bearing housing previously.

Upon asking the supplier about if the bearings were new or not, I was informed that every manufacturer tests a sample few bearings out of the larger manufactured lot by holding them in a jig, which results in the markings on the race. I was told by the supplier to not be worried and use the bearings.

Does anyone else have any knowledge on the subject? or have gone through this experience?

A picture of the marking is attached.

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Pathfinder Tags: bearing bearings FAG Roller SKF tribology
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Guru

Join Date: Apr 2008
Location: Chicago
Posts: 2275
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#1

Re: Marks on the Outer Race of a New Bearing

11/23/2017 8:29 AM

If he said they didn't test any.. I'd be more worried.

Perfectly acceptable..

Burned in, blue printed, or tested is always good for me.

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Participant

Join Date: Nov 2017
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#2
In reply to #1

Re: Marks on the Outer Race of a New Bearing

11/23/2017 9:21 AM

Hi JE,

Can you share the details of checks that we should have for new bearings ?

Surface marks and shading effect on rollers and races is always confusing for us while accepting new bearing .....

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Join Date: Apr 2008
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#5
In reply to #2

Re: Marks on the Outer Race of a New Bearing

11/23/2017 2:52 PM

not my area.

It would be acceptable to ask for photos of what a typical tested bearing looks like for comparison.

I too would be surprised by testing that wasn't clean enough to go unnoticed.

Further inquirie is justifiable

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Guru

Join Date: Jan 2010
Location: Mineral wells Tx
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#3

Re: Marks on the Outer Race of a New Bearing

11/23/2017 9:47 AM

It is not a problem. They are marks to identify the correct positioning of the elements. Normal practice

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Join Date: Oct 2008
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#4

Re: Marks on the Outer Race of a New Bearing

11/23/2017 10:54 AM

It is good that you consulted with your, "very reliable source that I had been procuring from for over a few years."

Trust them!

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Join Date: Jul 2013
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#6

Re: Marks on the Outer Race of a New Bearing

11/27/2017 4:36 PM

If you do not believe your supplier enough to take their explanation, call the manufacturer of the bearing direct. If the marks on the bearing still concern you then the bearing must cost a few dollars more than others. Listen to the supplier, Call the bearing manufacturer and get their explanation. We can only guess and to tell you the truth, the marks are on the OUTSIDE of the race. It will get a few more scratches when you install it in the housing.

Install it and get along with your day! But make sure it's lubricated first. I see too many unlubed bearing failures due to the job getting rushed.

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