Copper particles in oil sample

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We recently got analysis done on oil sample and found copper particles. The bearing is SKF 7313 BEGAM. Does anyone know the cage material of this bearing.

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This site http://www.wychbearings.co.uk/7306begam_skf.html has a breakdown of the suffix as

quote:
Technical breakdown of the suffix:BEGAM - 40° contact angle, optimized internal design, universal matching with a light pre-load, machined brass cage.

Note the info is specific to the 7306BEGAM but likely applicable to your bearing, just a different physical size.

The "M" is machined brass cage for SKF. MP is the designation for a FAG bearing.

10/17/146:04 PM

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