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Decoding hand etched numbers on 7014 angular contact bearings...

Decoding hand etched numbers on 7014 angular contact bearings...

(OP)
Hey all,

I'm rebuilding an early 80s machine tool, and the (vertical)spindle uses NSK 7014A bearings. There are some hand etched codes on the outer race of the bearing that I can't find any information on. I want to make sure I know what was in there to begin with before I order replacements. They are DBB arrangement, P4 precision, phenolic cage, and I'm really hoping some of the additional hand etched information can tell me clearance and preload specs.

Lower pair:
7014A DBBP4C8 CH NDH-669C NSK CK-107

Upper pair:
7014A DBBP4C8 CH NDH-669A NSK CJ-57

Hopefully one of you have seen these markings before.

Thanks,

Pete

RE: Decoding hand etched numbers on 7014 angular contact bearings...

ABEC 7 = ISO P4 = "superprecision"

I believe C8 is a "clearance" like C3 etc.
Except it is a preload.

Medium according to page 11 here -
http://www.harshagencies.com/pdf/NSK%20&%20RHP...

Note inner and outer spacers must be equal length within 0.0001" or so to keep the preload close to as-manufactured.

RE: Decoding hand etched numbers on 7014 angular contact bearings...

(OP)
I can't possibly thank you enough for that link. I have spent hours looking for that.

I knew they were abec7/p4, and I thought C8 might have been clearance as well, but I couldn't find a clearance chart that went above C3. I will make sure the spacers meet the specs on the surface plate before reinstalling (I suspect they do though.)

Thank you very much for your help!

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