Bearing suffix

I have a some belt conveyor drive motors, SEW make 18.5 kW. The bearings installed as per data sheet & name plate are "6312-2Z-C3-K52". Another 15 kW motor has 6312-2RS-C3-K24. 

I wonder what this "K52 & K24" stands for? Checked with SKF, FAG, NTN, could not get it.

Thanks

Akhil

Original Post

Typically K24 designation for a motor is primed only (not painted) and K52 is that the motor is rated to IP56 protection. In this respect I would fathom a guess that the designation has nothing to do with the bearing numbers but is a motor designation number.

ckyjohn posted: In this respect I would fathom a guess that the designation has nothing to do with the bearing numbers but is a motor designation number.

From the way the OP posted the information, both initially and as supporting info, I think he was referring to bearing numbers, not a motor.

ckyjohn posted:

Typically K24 designation for a motor is primed only (not painted) and K52 is that the motor is rated to IP56 protection. In this respect I would fathom a guess that the designation has nothing to do with the bearing numbers but is a motor designation number.

John these are bearing suffixes. I don't think they have anything to do with the motor.

John from PA posted:

Probably best to go back to FAG. My reference material says K24 refers to the Dupont grease I previously mentioned, but the material is not FAG.  In the FAG line, I can find mention of K for taper, but no mention of K24 or K52.

Yes John FAG catalogue does not have such a bearing listed.

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