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ZombieChristoph

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Reply with quote  #1 
I have a set of NMB bearings.  They say 608S on them.  They do not fit on Independent 169 or 215, but they DO fit on a pair of Indy 129's, and they fit on a pair of Grind King Jay Adams .  They also do not fit on Gullwing Chargers or Randals.  So the questions are:
Has anyone else encountered something like this?
What is the diff between 608S and 608Z and 608ZZ, and does this have anything to do with it?

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T

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Reply with quote  #2 
Hmmm....never herd of 608S but I thought 608 bearings always had an 8mm bore (inside diameter) so they should fit as it is slightly larger (8mm = .3149", 5/16" = .3125") than the axle diameter on most mass produced trucks and actually needs to be shimmed to take out the slop or the stock axles could be replaced with an 8mm version.

608 2RS, 608 RS, 608 ZZ, 608 Z, specs

a          B          C

8mm    22mm    7mm




"Z" is a designation which means a steel shield covering the side of the bearing (for most brands). "ZZ" simply means that the bearing has a shield on both sides. Normally, the shield itself will be branded as "608 Z" even though there is a shield on both sides of the bearing. 

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ZombieChristoph

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Reply with quote  #3 

Thanks for the reply.  It sure is strange.  I've never seen this before.  They say NMB 608S Thailand on 'em.  Well...I'll be damned... weird.  I was wondering if it might be because the axles might be made in the US vs. overseas or something.  It might just be an anomoly, but I have 8 bearings that are like this.  Looking at it, it's SOOOO close.  They fit over the threads...I wonder if a little lube would do the trick.


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OldSchoolSkate

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Reply with quote  #4 
Ok, while I couldn't find any info on the "608S" I did find this: "6" tells us they're Single-row deep groove ball bearings. The second digits tell us the robustness of the bearings. "0" is an "extra light" bearing without being abnormally thin. The third digit "8" indicates the bore size in millimeters, 8mm bore.


The "Z" in a 608Z bearing indicates a single shield, ZZ indicates a double shield.
RS would indicate a single seal and 2RS indicates a double sealed bearing.

My guess on the fitment problem is poor tolerances. If the bearing are at the low side and the axles are on the high side of their tolerances they may not fit each other though I've never run into this problem myself.

Hope this helps.


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ZombieChristoph

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Reply with quote  #5 

It does.  for all that matters maybe a little steel wool on the axles and a little lube would help.  Thanks gents.


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300hpdavid

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Reply with quote  #6 
That right there was a PILE of good info!

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ISLANDSK8R

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Reply with quote  #7 
Quote:
Originally Posted by 300hpdavid
That right there was a PILE of good info!

Fuck yeah it is. 
TonyB

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Reply with quote  #8 

Yes good info gents.


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Ragenar

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Reply with quote  #9 
I ignore the markings and just throw them into the wheels! Thanks for the info anyway.

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ZombieChristoph

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Reply with quote  #10 

That's what I thought ,too, until they didn't fit on my trucks..lol...


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scooperman

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Reply with quote  #11 
My Sears "Whispertone" vacuum cleaner motor has NMB608S bearings in its vacuum motor.  I know cause the one on the fan end of the motor died, I spent all half an hour getting the old inner race off the shaft.   Searching for a source of these bearings, I find lots of generic 608 but no 608S anywhere.  My guess is that the seals are different for this application, when a vacuum motor loses airflow ( clogged hose) it speeds up to ridiculous rpm. 
HBO

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Reply with quote  #12 

there's writing on bearings???


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NoShit

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Reply with quote  #13 

It only takes a few thousands of an inch to turn a slip-fit into a press-fit.  I have a set of Indy 215’s that bearings bound up on right before the hanger face. After three or four times pressing them on they stopped binding.


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pigiron666

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Reply with quote  #14 
wanted to know googled the question and you guys had it here
too funny
and informative

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WHMac

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Reply with quote  #15 
Scooperman I am having to replace the NMB 608S bearings in my Kenmore Whispertone.Would you mind sharing where you found them at? The cover says Singapore then the info above. I found 608 bearings will these work? I do no know what the "S" stands for but if dimensions are the same would a bearing without the "S" work? Thanks, WHMac!
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