Matched Angular Contact Bearings

It sounds as though purchase inventory and materials storage records are not as rigorous as those applied in a well-run facility. After all, having sorted this out, how would one prevent recurrence?

Yes our inventory management can be improved,
but for now , how i can match two bearing out of lot ?
any identification Mark ?

Easy. Contact the manufacturer directly.

Oh, er, see #3⇓.

I would try to get a spec sheet from the manufacturer....

http://www.nsk.com.br/upload/file/NSK_CAT_E1254f_148-151.pdf

Here are the markings for SKF

http://www.skf.com/group/products/bearings-units-housings/ball-bearings/angular-contact-ball-bearings/single-row-angular-contact-ball-bearings/designation-system/index.html

Matched bearing sets are typically packaged as a set. If separated, you become the proud owner of a collection of no longer matched angular contact bearings.

These days, most of the major bearing manufacturers produce "universally matched" angular contact bearings. For SKF the suffixes:

• CA, CB, CC or G for internal clearance
• GA, GB or GC for preload

As long as you know what is needed by way of preload or internal clearance then you can use any two with the same suffix and safely assume that they are "matched" - so you don't have to shoot your storeman yet nor do you have to order them in pairs, though it helps.