i work for a bearing distributor....for RM20 price range, the bearings if made in Japan probably not stainless steel ( but honestly you can get stainless steel Japan made if the shop do not make any mark up ).
If it is stainless steel, it is probably made in China.
any yes like katsumoto2011 says not all stainless steel are the same, there are types of stainless steel and even same type from different country can be different ( the most obvious is fm china ).
your bearings failed if it is not rust, it means contamination. the grease inside traps small particles as it is not a sealed bearing.
bearings hv 2 kinds of seals....a steel shield & rubber seal. besides that there are also various type of seals for different application.
steel shield ( chrome colour ) hv gaps ( non contact ) while rubber seal is contact seal ( usually black colour ).
rubber seal is better at protecting the bearing but hv less speed ( cos full contact with no air gap ) also cannot use where temp is high.
steel shields hv more speed & can use at higher temp but easily contaminated.
rubber seal is abt 50% speed of the steel shield bearings but honestly i thk in most fishing conditions the bearings do not even exceed 5k rpm and a typical rubber seal bearing max speed is easily 20-30k rpm.
ceramic bearings are the best but very costly.
hybrid ceramic bearings is another option ( balls are ceramic but inner & outer ring is bearing steel ) but the bearing steel can also corrode. china made hybrid ceramics costs maybe less than RM100 a pc. a german made is easily 2-4x the price fm a china made.
bearings also hv precisions & tolerances. Usually reputable manufacturers will use a higher grade accuracy & tolerance with stainless steel or anti corrosion coated ball bearings fm a reputable bearings manufacturer.
you can buy the same bearing fm a reputable bearing manufacturer but it will be expensive cos you only buy a few pcs only.
and then bearings also have clearance + preload. it's a bit too technical to go into but if you ever buy a confirmed higher grade ( anti corrosion ) bearing but find that the balance/feeling of the reel is wrong then it is probably cos of the bearing clearance.
my adv to you is if you have a good reel, at least go for a stainless steel....if your reel is a stella, saltiga, accurates, etc pay more for at least a japanese made stainless steel bearing with a higher grade( price shd be below RM100 depending on the size )
as for the seals of the bearings i would prefer a rubber seal cos of protection. but even rubber steel nds to change as it will eventually rusts.
a good bearing is smooth & hv no problem on the speed.
but bearings are mechanical parts thus they hv wear & tear.
bearings can be contaminated.....
for kakis who know how & loves to repair/service their own reel....my advise is to buy an open bearing ( stainless steel ) with no seals. you can easily flush out the wash the bearings & flush out the grease, then replace the grease after the bearing dries after washing.
if you decide to take my advise ......PLS CLEAN YR BEARINGS EACH TIME because without a seal particles are easily trapped in the grease & the bearings will jam.
fyi, the best type of bearings are precision & ceramic type made fm a well known & reputable high precision bearings manufacturer....and yes don't believe if it says high precision ball bearings on the box ( cos u nd to find out who the manufacturer & where it is made ).......and yes even the worlds's biggest and well known ball bearings maker SKF.....hv factories in China...Ha ha!
i prefer look bearing with abec grade , but those bearing is damn expansive ......
since you working at bearing industry,can help us find some abec 7 miniature bearing ah ????