| I took out the #2 because I took notice of the color somewhere in the beginning. Here are the two bearing halves. The right one has the color brown (?), or at least some color. 
Here's the PN stamped on the colored one 
Stamp says: NISSAN F-112 STD 12111 31P00 This PN 31P00 is grade 0 and should have no color. I checked the thickness of the colored one and the non-colored one. They are the same. If they were different by 3 mils I would definitely be able to measure that difference. Summarizing: all my new and old bearings are the same and have the same PN despite some new ones having different colors and coming from boxes labeled inconsistently. Also, based on the boxes alone I should have found many more grade 1s whereas most of my bearing halves had no color for sure. This is so weird! 
Thanks for your posts and interest.
OverZealous (CT) My General posts (click) My Technical posts (click) |