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Warning : SKF 6203 2RS JEM bearings.

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Forum topic by Rency posted 08-07-2020 09:02 PM 431 views 0 times favorited 14 replies Add to Favorites Watch
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Rency

85 posts in 1213 days


08-07-2020 09:02 PM

Okay Peeps,
6203 bearings are commonly used in our machines and motors. When you get the SKF 6203 2rs JEM bearings be careful. I got them from Grainger and Applied Industries and both on the pack would say 2RS JEM but on the bearing inside would say 2RHS on the stamping on the outer edge of the bearing. If your eyes are not in great shape you have to use a magnifying glass to see it. 2RHS is not rated for 24000 or 19000 but only 12000 rpm. But the 2RSL is rated for 19000. The spec of SKF 6203 2RS JEM would say rated for 24000 or 19000 and is even listed as ABEC 3 at some websites like Motion Industries. But inside the box you get is 2RHS. So don’t trust the specs of JEM and the JEM labeling on the box. I also found reviews on amazon saying the same issue happening with bearings sold as SKF 6203 2rs JEM bearings.

Whether 2RHS is enough for our our application or not is not the issue. I mean if you are paying for a tighter precision rated and higher rpm rated bearing that is what should be inside the box too. Maybe they are counting on people who would not think about looking at the stamping on the actual bearing. I don’t know whether it’s SKF or some dealers, intentional or unintentional, but at the end of the day it is the consumer being cheated.

I returned them and got NTN 6203 LB rubber sealed bearings from grainger. They are made in Canada. Now with the NTN, LU means contact and LB means non contact. I prefer non contact, (LB)because of lesser friction, lesser drag.

Thanks

-- Rency


14 replies so far

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Rency

85 posts in 1213 days


#1 posted 08-07-2020 09:11 PM

If the motor is TEFC (totally enclosed) I get the non contact class sealing for the motor- if it is NTN the LB and for the parts exposed to wood dust I might get the LU, contact types.

-- Rency

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MrUnix

8211 posts in 3046 days


#2 posted 08-07-2020 10:32 PM

I’m not sure where you are getting your information, but according to the SKF catalog, there is no such thing as a “JEM” suffix, and their current bearings and mounted products catalog says the following:

What does “JEM” mean?

In the aftermarket, SKF uses the designation “JEM” for deep groove ball bearings that are primarily used in electric motor applications. The “J” designates a steel cage and “EM” designates electric motor quality as required by electric motor OEMs. Several characteristics define the “JEM” specification – all of which come standard in the SKF deep groove ball bearing and meet industry requirements.
• C3 radial internal clearance
• Steel cage
• Electric motor noise quality levels
• GJN grease supplied in the double shielded or sealed versions
GJN is a urea-based high temperature grease that offers a wide range of operating temperatures and is quiet running. It is compatible with most other polyurea and lithium based greases.

(Emphasis is mine)

So basically it’s just a fairly standard C3 bearing designated for electric motor use. As for speed, the catalog only shows the open bearing (no shield or seal) with a limiting speed of 24,000 rpm [1]. The normal sealed bearing (2RSH) is listed at 13,000 rpm, and the low friction sealed bearing (2RSL) at 19,000 rpm (which is the same as the 6203-2Z shielded bearing).

[1] There is a 6203 ETN9 that has a limiting speed of 24,000, but those use special glass reinforced ball sets and cages.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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Rency

85 posts in 1213 days


#3 posted 08-07-2020 11:00 PM


I m not sure where you are getting your information, but according to the SKF catalog, there is no such thing as a “JEM” suffix, and their current bearings and mounted products catalog says the following:

What does “JEM” mean?

In the aftermarket, SKF uses the designation “JEM” for deep groove ball bearings that are primarily used in electric motor applications. The “J” designates a steel cage and “EM” designates electric motor quality as required by electric motor OEMs. Several characteristics define the “JEM” specification – all of which come standard in the SKF deep groove ball bearing and meet industry requirements.
• C3 radial internal clearance
• Steel cage
• Electric motor noise quality levels
• GJN grease supplied in the double shielded or sealed versions
GJN is a urea-based high temperature grease that offers a wide range of operating temperatures and is quiet running. It is compatible with most other polyurea and lithium based greases.(Emphasis is mine)

So basically it s just a fairly standard C3 bearing designated for electric motor use. As for speed, the catalog only shows the open bearing (no shield or seal) with a limiting speed of 24,000 rpm [1]. The normal sealed bearing (2RSH) is listed at 13,000 rpm, and the low friction sealed bearing (2RSL) at 19,000 rpm (which is the same as the 6203-2Z shielded bearing).

[1] There is a 6203 ETN9 that has a limiting speed of 24,000, but those use special glass reinforced ball sets and cages.

Cheers,
Brad

- MrUnix

I am not getting my information from anyone but my own experience of reading the specs and ordering and getting a different bearing.

Motion industries :

Applied industrial:

I hope you read my post. I said I don’t know whether it is some dealers issue or intentional or unintentional.

Thanks for educating on what JEM is.

But just saying if you are ordering this particular labeled box you are not getting the bearing that you ordered. It is specified wrong on many different dealers sites.

-- Rency

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Rency

85 posts in 1213 days


#4 posted 08-07-2020 11:16 PM

So maybe the question should be where are these dealers getting their information from.

-- Rency

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MrUnix

8211 posts in 3046 days


#5 posted 08-07-2020 11:59 PM

I am not getting my information from anyone but my own experience of reading the specs and ordering and getting a different bearing
[...]
I hope you read my post. I said I don’t know whether it is some dealers issue or intentional or unintentional. But just saying if you are ordering this particular labeled box you are not getting the bearing that you ordered.
- Rency

LOL – I read your post… multiple times just to make sure. My take away from it is that Granger has the wrong info posted, which is not uncommon for them, and they are charging multiple times more than what those bearings should cost if you purchased them from a reputable bearing supplier. What I quoted was directly from SKF, and they say that “JEM” bearings are simply standard bearings suitable for electric motor use. -2rs is the same as -2RSH, so that is what I would expect to receive if ordered.

The speeds I also obtained directly from the SKF catalog, which shows that only the open race 6203 has a limiting speed of 24,000. “JEM” or not, there is no getting around that. Who are you going to believe… Granger, or the people who made the bearing?

Cheers,
Brad

PS: Last time I bought 6203’s (a few months ago), I got Nachi’s from Accurate bearing and paid something like $4 a piece for them.

-- Brad in FL - In Dog I trust... everything else is questionable

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Rency

85 posts in 1213 days


#6 posted 08-08-2020 12:41 AM


I am not getting my information from anyone but my own experience of reading the specs and ordering and getting a different bearing
[...]
I hope you read my post. I said I don’t know whether it is some dealers issue or intentional or unintentional. But just saying if you are ordering this particular labeled box you are not getting the bearing that you ordered.
- Rency

LOL – I read your post… multiple times just to make sure. My take away from it is that Granger has the wrong info posted, which is not uncommon for them, and they are charging multiple times more than what those bearings should cost if you purchased them from a reputable bearing supplier. What I quoted was directly from SKF, and they say that “JEM” bearings are simply standard bearings suitable for electric motor use. -2rs is the same as -2RSH, so that is what I would expect to receive if ordered.

The speeds I also obtained directly from the SKF catalog, which shows that only the open race 6203 has a limiting speed of 24,000. “JEM” or not, there is no getting around that. Who are you going to believe… Granger, or the people who made the bearing?

Cheers,
Brad

PS: Last time I bought 6203 s (a few months ago), I got Nachi s from Accurate bearing and paid something like $4 a piece for them.

- MrUnix

I understood what you are saying about the JEM . But my point is this SKF 6203 2rs JEM bearings are listed with the wrong spec at multiple dealers. Not just grainger. Grainger, Motion Industries , Apllied Industries and Amazon. If the spec say it is rated for 19000 I am expecting a 2RSL. But what I am getting inside the box is a 2RHS bearing rated for 13000. It is not contradicting what you found and shared here from the SKF catalogue.

My intention is to warn people like me who might be buying these bearings looking at the specs listed by the dealers. Because you are not getting what you believe you are getting when you order them.

I am not saying the skf catalogue is wrong. This particular bearing is being listed with the wrong specs by , not just one but multiple sellers. So this is more about the practical side as a consumer. Not about knowledge of skf catalogue.

Thanks again for educating. But at the end of the day myself and many others are getting the wrong product.
I think there is value in letting people know that.

-- Rency

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Rency

85 posts in 1213 days


#7 posted 08-08-2020 12:52 AM

Mr Unix,

I will not expect 2RHS in the box if the spec says rated for 24000 or 19000. According to the catalogue part you shared I would expect 2RSL.

I ordered from both Grainger and Applied Industries and got the 2RHS bearing , but what the spec was more in line with 2RSL. I have posted pictures of people saying same thing happening to them on Amazon . Now Motion Industries list them as ABEC 3 and they are not ABEC 3.

So clearly there is something going on with the SKF bearing sellers.

-- Rency

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Aj2

3324 posts in 2645 days


#8 posted 08-08-2020 03:42 AM

If you think that’s bad try buying from Ebay. That’s where I buy most bearings from I’ve gotten some real duds and some smokes deals. I’ve bought skfs explorer from Mc master Carr but never graingers they always are over priced.
If I need something cheap and fast there’s a local Mid point bearing store near me.

Good Luck

-- Aj

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Rency

85 posts in 1213 days


#9 posted 08-08-2020 04:52 AM



If you think that’s bad try buying from Ebay. That’s where I buy most bearings from I’ve gotten some real duds and some smokes deals. I’ve bought skfs explorer from Mc master Carr but never graingers they always are over priced.
If I need something cheap and fast there’s a local Mid point bearing store near me.

Good Luck

- Aj2

Thanks AJ.

I usually get them from Motion industries, applied industries or grainger. Never had this problem when I buy nachi, koyo or ntn. The other good thing about nachi or koyo is that you get Japan made bearings. You don’t have to open the box and figure out where they are made. :)

-- Rency

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CaptainKlutz

3586 posts in 2342 days


#10 posted 08-08-2020 05:24 AM

FWIW
Counterfeit bearings are rampant issue across the industry. SKF, NTN, and Timken are most common fakes. Rumor has it Amazon and fleabay are 90+% counterfeit, grade B rejects, or old stock with grease that is 10+ years old. Only way to ensure you are getting what you want is via an mfg authorized distributor for your preferred bearing type.

Even some the the large names in MRO replacement market are falling prey to cheap bearings and don’t find out till warranty claims start being filed:
https://www.mromagazine.com/features/bearing-witness-ten-industry-tips-on-how-to-avoid-counterfeit-bearings/

There is a ton of WWW information on counterfeit bearings if you search around. Counterfeiting is so bad, SKF and NTN have even released authentication apps for your phone to help folks determine if bearing source is real or fake!

I never buy mission critical or motor bearings online. Got some fake NTN’s from Motion Industries one time, that lasted about a year. Won’t make that mistake again. I only get my bearings from a couple LOCAL sources that are authorized distributors for the brands they carry. Lately it’s been Nachi, Koyo, NTN, or Timken; from either Bearing-Belt & Chain , or Precision Electric Motor service. BBC gives me same prices as average online price, ends up cheaper than paying for shipping online. Precision will match BBC prices if I complain. :-)

+1 $17 for 6203-2RS C3 is total robbery.
I pay $4-5 for Koyo 6203 depending on open/shield/sealed type. Even the Timken brand that is normally priced like it has gold plating only costs me $10 for a 6203-RS3C.

YMMV

-- If it wasn't for bad luck, I wouldn't have no luck at all, - Albert King - Born Under a Bad Sign released 1967

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Rency

85 posts in 1213 days


#11 posted 08-08-2020 05:46 AM



FWIW
Counterfeit bearings are rampant issue across the industry. SKF, NTN, and Timken are most common fakes. Rumor has it Amazon and fleabay are 90+% counterfeit, grade B rejects, or old stock with grease that is 10+ years old. Only way to ensure you are getting what you want is via an mfg authorized distributor for your preferred bearing type.

Even some the the large names in MRO replacement market are falling prey to cheap bearings and don t find out till warranty claims start being filed:
https://www.mromagazine.com/features/bearing-witness-ten-industry-tips-on-how-to-avoid-counterfeit-bearings/

There is a ton of WWW information on counterfeit bearings if you search around. Counterfeiting is so bad, SKF and NTN have even released authentication apps for your phone to help folks determine if bearing source is real or fake!

I never buy mission critical or motor bearings online. Got some fake NTN s from Motion Industries one time, that lasted about a year. Won t make that mistake again. I only get my bearings from a couple sources that are authorized distributors for the brands they carry. Lately it s been Nachi, Koyo, NTN, or Timken; from either Bearing-Belt & Chain , or Precision Electric Motor service. BBC gives me same prices as average online price, ends up cheaper than paying for shipping online. Precision will match BBC prices if I complain. :-)

+1 $17 for 6203-2RS C3 is total robbery.
I pay $4-5 for Koyo 6203 depending on open/shield/sealed type. Even the Timken brand that is normally priced like it has gold plating only costs me $10 for a 6203-RS3C.

YMMV

- CaptainKlutz

Thanks for the recommendation. I will check those stores out. Appreciate it.

-- Rency

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Rency

85 posts in 1213 days


#12 posted 08-08-2020 05:58 AM



I m not sure where you are getting your information, but according to the SKF catalog, there is no such thing as a “JEM” suffix, and their current bearings and mounted products catalog says the following:

What does “JEM” mean?

In the aftermarket, SKF uses the designation “JEM” for deep groove ball bearings that are primarily used in electric motor applications. The “J” designates a steel cage and “EM” designates electric motor quality as required by electric motor OEMs. Several characteristics define the “JEM” specification – all of which come standard in the SKF deep groove ball bearing and meet industry requirements.
• C3 radial internal clearance
• Steel cage
• Electric motor noise quality levels
• GJN grease supplied in the double shielded or sealed versions
GJN is a urea-based high temperature grease that offers a wide range of operating temperatures and is quiet running. It is compatible with most other polyurea and lithium based greases.(Emphasis is mine)

So basically it s just a fairly standard C3 bearing designated for electric motor use. As for speed, the catalog only shows the open bearing (no shield or seal) with a limiting speed of 24,000 rpm [1]. The normal sealed bearing (2RSH) is listed at 13,000 rpm, and the low friction sealed bearing (2RSL) at 19,000 rpm (which is the same as the 6203-2Z shielded bearing).

[1] There is a 6203 ETN9 that has a limiting speed of 24,000, but those use special glass reinforced ball sets and cages.

Cheers,
Brad

- MrUnix

Thanks for the info. Taking the info you shared into account I have made some changes to the original post.

Appreciate it.

-- Rency

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MrUnix

8211 posts in 3046 days


#13 posted 08-08-2020 07:13 PM

Maybe they are counting on people who would not think about looking at the stamping on the actual bearing.

This sentence perplexed me… were you actually expecting to see “JEM” stamped on the side of the bearing?

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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Rency

85 posts in 1213 days


#14 posted 08-08-2020 08:21 PM



Maybe they are counting on people who would not think about looking at the stamping on the actual bearing.

This sentence perplexed me… were you actually expecting to see “JEM” stamped on the side of the bearing?

Cheers,
Brad

- MrUnix

To be honest I originally thought JEM might be stamped on the bearing. Now I understand that it is a generic suffix for many of their bearings. But I definitely was expecting the bearing in the box to have the stamping that relates to the specifications listed by the seller. So 2RHS is not what I expected because it has a different spec than what the dealers are listing.

I understand your JEM point . You win on that department. You are very knowledgeable about SKF catalogue and maybe many other catalogues. But it doesn’t negate the fact that I as a consumer was getting the wrong product inside the box. Hope you understand that my point is about multiple dealers, not just Grainger, listing SKF bearings 6203 2RS with one specification and in the box comes a bearing that does not have those specifications.

With other bearings I personally have not encountered this issue.

-- Rency

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