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Please help identifying a bearing

planoleg

Aluminum
Joined
Nov 3, 2023
Rebuilding a transfer case.
Seems this bearing doesn't exist anymore?
Contacted SKF and multiple bearing sellers, nobody really has a clue and I can tell that by seeing how they suggest I buy an improper bearing.
Even with my limited knowledge I can tell they're suggesting something that's clearly not right, I.e. this bearing has a groove for a circlip, and they suggest me a regular bearing without it.

I've kinda figured out a lot of it, just wanted to validate and double check.

6011 ntn9/c3d7vb344

6011 - size
N - snap ring groove
TN9 - Glass fibre reinforced PA66 cage, ball centred (does this still exist? Can't find it anywhere)

Now for the letters after the dash, do they mean anything?
I.e.

C3 - Radial internal clearance greater than Normal


Deep Groove | VB344 Boundary Dimension Deviation

What does D7 mean?

I found a similar bearing, but it doesn't seem to be C3 version, so I'm not sure if it's suitable?
6011nr-skf

Below is the picture of the original I'm replacing.

Would really appreciate some help!

20231102_121644.jpg
 
You will find there are specialist bearing suppliers'' (you'll have to dig) that may be able find and supply bearings us mere mortals can't.

You'll have to dig.
 
I've looked everywhere online and called all the local shops, who referred me to the main suppliers in town, who didn't have it.

I think it's not a bad idea to try to get a groove cut by a pro.
I'll try that on Monday, and absent that possibility, will have to go with something like this

I wish I just understood the full naming convention of the old bearing. It would make it easier finding the new bearing.
 
That's the one! Seen this listing before. It's a Ukrainian website, they're selling a used bearing that they probably removed when taking apart the transfer case :)
 
Rebuilding a transfer case.
Seems this bearing doesn't exist anymore?
Contacted SKF and multiple bearing sellers, nobody really has a clue and I can tell that by seeing how they suggest I buy an improper bearing.
Even with my limited knowledge I can tell they're suggesting something that's clearly not right, I.e. this bearing has a groove for a circlip, and they suggest me a regular bearing without it.

I've kinda figured out a lot of it, just wanted to validate and double check.

6011 ntn9/c3d7vb344

6011 - size
N - snap ring groove
TN9 - Glass fibre reinforced PA66 cage, ball centred (does this still exist? Can't find it anywhere)

Now for the letters after the dash, do they mean anything?
I.e.

C3 - Radial internal clearance greater than Normal


Deep Groove | VB344 Boundary Dimension Deviation

What does D7 mean?

I found a similar bearing, but it doesn't seem to be C3 version, so I'm not sure if it's suitable?
6011nr-skf

Below is the picture of the original I'm replacing.

Would really appreciate some help!

View attachment 414618
C3 is std for electric motor bearings. The xtra clearance is for high RPM so good for trany. Cage mat can vary, not a big deal here.
If you go to SKF , or any major bearing mfg site , they have extensive explanations of numbering system.
A 6011 w/ snap ring groove does not seem like a stretch but if you have to, a groove could be ground into the outer race.
 
You might want to give these people a call. I purchased some long obsolete bearings from them when I was rebuilding the AllSpeed drive in my Sheldon lathe. They specialize in obsolete and hard to find bearings.

 
Well that's the thing, I didn't really find VB344 in skf numbering system.
I'm just trying to understand and learn.
But they don't list it.

And the also don't list what D7 means.
Would be great to know.

The only reason I found out what VB344 means - deep groove, is from this website

Maybe VB344 has been dropped as redundant. Because I guess aren't all bearings deep groove in this category, or at least probably all 6011 bearings are deep groove?

As to D7, who knows what it means....

Well you know what, I'll maybe place that bearing in a vise and try to cut a groove if I feel I can do it straight.

Otherwise here's the closest and cheapest source of the bearing I think I need.


Hopefully it's a legit distributor and not some knockoff.

90% of bearing websites on the internet all seem to be from UK for some reason.

It's just annoying that BMW won't answer, and SKF won't break down and decipher their own bearing number for me.
 
You might want to give these people a call. I purchased some long obsolete bearings from them when I was rebuilding the AllSpeed drive in my Sheldon lathe. They specialize in obsolete and hard to find bearings.

They do seem to have the right bearing,


Somehow for a crazy cheap price.
Unfortunately they don't ship outside of US. I emailed them to see if they'd ship to Canada but got no answer. I guess I could set up a mail forwarding service, but might as well just order from bepltd.com
 
Type bearing number codes in your search and spend some hours . It is not a simple subject and while most codes are standardized not all suffixes are. The ID, OD and width are in the number. I would stick with name brand only in a gear box.
 
They do seem to have the right bearing,


Somehow for a crazy cheap price.
Unfortunately they don't ship outside of US. I emailed them to see if they'd ship to Canada but got no answer. I guess I could set up a mail forwarding service, but might as well just order from bepltd.com
This company is not your typical bearing distributor. They buy distributor overstock and obsolete bearings as well as stock from closing businesses

I bought several bearings from them for my lathe. They were a fraction of the price other bearing houses were asking. 6 years later all the bearings I bought from them are still up and running fine.
 
What does D7 mean?
IIRC, the D7 is the class of bearing.

you mention cutting the groove...
how ? ;)
That is going to be a grinding operation (precision grinding, probably not with a dremel ) or 'possibly' a ceramic grooving insert... in any event ensure you protect the internal part of the bearing from grinding grit, lathe chips, etc... I see that image of that bearing has a seal, a good layer of grease over it to catch the swarf or chips...

at one point in time there was a bucket of these around shop from old exploded jeep transfer cases (we're talking 1970's 1980's when we raced them and before converting to a chain drive... a fiber drum of shafts, gears, bearings, yokes my departed dad sent to the scrap yard....
 
Thanks for the info. I wonder why the old bearing had so many letters and numbers that mean different stuff, but the new bearing has a lot less! For D7 here's what I found online:
The D7 thrust bearing is a single direction, flat seat design thrust ball bearing with a 7/8" bore. What separates this bearing from some of the other D7 bearings on the market is its precision-made components, 52100 thru-hardened steel rings and balls, and high-quality, low-carbon steel band. This bearing is also supplied with light oil lubrication from the factory and features an oil hole in the band for relubricating. Thrust ball bearings are rotary bearings designed to support a predominately axial load. D7 bearings are composed of bearing balls that are supported in a ring and allow for use in applications with low thrust and little axial load.


For now I ordered 6011NRC3, that's the best I can do so far. It ships tomorrow.

VS the old one, 6011 ntn9/c3d7vb344

So basically they dropped NT9 and d7vb344

N meants groove, R means snap ring, C3 means greater tolerance. But why it doesnt mention the specs from the original bearing, the remaining NT9 and d7vb344...thats the only concern I had, what if that stuff is important...

For cutting a groove, I meant something like this, but I don't even have a table saw.https://youtu.be/vrwoZODjS9A?si=AE-zItZeoKxYSP6Y

So I'll just wait until I get a new bearing
 
I needed to put some grease grooves in some dowel pins for Rockford clutch overhaul . There was no parts support for this old crawler.
You could use a similar method to put a snap ring groove in if it comes to that.IMG_0633.jpeg
 
Bearing manufactures after several years will drop definitions because they consider them obsolete. They describe anything from the fit of the bearing to the type of grease that is supplied with a bearing. Can also describe a bearing with a wider inner race verses the outer race or vice verses. Depending on how much thrust load the bearing sees, you may get by using a standard 200 series bearing with snap ring groove.

I have a few in my stash of old bearings with snap rings but none of that size.
 
Have cut grooves in lots of bearing OD's.
Done using a coated carbide grooving insert, not an issue.
Need to protect the beating form swarf.
I make a spud that i grip in the lathe. Needs to be substantial, like 1.5" OD or so.
OD of the spud must be big enough to cover the opening where the balls and cage can be seen.
Turn a slip fit shoulder that fits the ID of the bearing make that portion slightly shorter than the width of the bearing.
Drill and tap for a clamp bolt. Cap with a washer that also covers the balls and retainer. Clamp with bolt, turn the groove on the OD.

Cheers Ross
 
Thanks for your help guys. Unfortunately I don't have any of the equipment mentioned, but hopefully the bearing I ordered will ship soon.
If not, I'll try to find someone local who could do this job.
 








 
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