I think those are counterfeit bearings, i traced that makers code to China knock off BS company , 1 of 600 there, most are junk. and huge problem for the to 10 prime makers of bearings.
where do you buy them name or better source, not NAPA I BET.
refr.
https://fixkick.com/hubs/FW_BEARINGS.html
where do you buy them name or better source, not NAPA I BET.
refr.
https://fixkick.com/hubs/FW_BEARINGS.html
http://www.fixkick.com