|
Finally,
a brand of bearings made in China
that you can count on for high quality, consistency and availability.
 RBI Bearing is proud to introduce RBtech - our Premium line of Motor Quality Bearings. With RBtech you are always assured of
- Mobil Polyrex EM 2, Electric Motor Quality Lubricant
- Honed super finished raceways optimized for long life and low noise
- 100% noise and vibration tested
- Precision balls equal to or better than ABMA grade 10
- Heavy duty bar-coded corrugated bearing boxes
- Available from our inventory in the following sizes:
6000 - 6017
6200 - 6217
6300 - 6317
Computer monitors for sale
We have fifteen 17" CRT computer monitors for sale from various manufacturers including Future Power, Visual Sensations and DigiView - $50 each or make us an offer. All FOB Roselle, IL. Please click here if you're interested.
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a Swingmaster Classic Pro Jump Rope - $60 Retail Value |
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OCTOBER
2005 WINNER
Jeff Mauldin
HH Technologies
Bremen, AL
Previous
Winners |
China
Update
A monthly look at news from
China
Click the title to read
the story
China seeks 7.5% annual GDP growth
China aims to maintain average annual economic growth rate of 7.5 percent from 2006 to 2010, in line with the country's long-term goals, the country's development chief said in an article published on Tuesday.
Chinese businessman books space tour
A Chinese man has paid $100,000 for a 90-minute voyage that will make him China's first tourist in space.
Tomb scan reveals buried treasure
A magnetic scan of the unopened tomb of China's first emperor has detected a large number of coins, suggesting Emperor Qin was buried with his state treasury.
Imagine Detroit's Big 3 - 10 years out
What materials are used in precision ball bearings?
by
Mike Mortensen - Director of Engineering RBI-USA
Several materials can be used to make bearing balls. When considering which material to use, it is important to factor in the cost, hardness, and strength. The most common ball material is 52100 chrome alloy steel. 52100 chrome alloy is versatile in regards to its lower cost, high hardness and strength.
Another commonly used material is stainless steel. When compared to 52100 chrome steel, stainless steel lacks some hardness and strength, but has the added benefit of being resistant to corrosion. Still another ball material, which is growing in use, is ceramic. Ceramics vary widely, but compared to 52100, they are much harder, stronger, lighter, and more resistant to corrosion. The main drawback in using ceramic is its higher cost.
The ball material used depends upon on the application. Most applications would only require 52100 chrome steel. In environments where corrosion is an issue, stainless steel may need to be considered. For the most demanding applications (e.g. high temperature, high stress, high speed, etc.) only a ceramic ball material may suffice.
Some various material properties can be found in Table 1. Table 1 . Properties of various precision ball materials.
Material |
Typical Hardness |
Yield Strength [kpsi] |
Ultimate Strength [kpsi] |
Elastic Modulus [kpsi] |
Density lbs/in 3 |
Maximum Operating Temperature * [°F] |
Chrome
Alloy Steel |
52100 |
60-67 HRC |
295 |
325 |
29,500 |
0.283 |
400 |
Tool
Alloy Steel |
M50 |
60-65 HRC |
- |
- |
29,000 |
0.288 |
1000 |
Stainless
Steel |
302 |
25-39 HRC (Cold Worked) 75-90 HRB (Annealed) |
40-140 |
90-185 |
28,000 |
0.286 |
250 |
304 |
25-39 HRC (Cold Worked) 75-90 HRB (Annealed) |
42-140 |
84-185 |
28,000 |
0.286 |
250 |
316 |
25-39 HRC (Cold Worked) 75-90 HRB (Annealed) |
42-140 |
84-185 |
28,000 |
0.288 |
250 |
440C |
58-65 HRC |
275 |
285 |
29,000 |
0.277 |
900 |
Ceramic |
Alumina Oxide |
1365 HV |
- |
330 C ** |
54 ,000,000 |
0.139 |
3180 |
Ruby Sapphire |
1570-1800 HV |
- |
300 C ** |
50 ,000,000 -54 ,000,000 |
0.144 |
3250 |
Silicon Nitride |
1500-2000 HV |
- |
341 C ** |
47 ,000,000 |
0.116 |
2552 |
Zirconia |
1250 HV |
- |
795 C ** |
31 ,000,000 |
0.219 |
1800 |
* Special process may be required to achieve maximum operating temperature |
** C denotes compression |
Technical Article Archive
Have
a question or topic you would like to see covered? Click
here to let Mike know!
Final Word - Cna yuo reda tihs?
Cdnuolt blveiee taht I cluod aulaclty uesdnatnrd waht I was rdanieg. The phaonmneal pweor of the hmuan mnid, aoccdrnig to a rscheearch at Cmabrigde Uinervtisy, it deosn't mttaer in waht oredr the ltteers in a wrod are, the olny iprmoatnt tihng is taht the frist and lsat ltteer be in the rghit pclae. The rset can be a taotl mses and you can sitll raed it wouthit a porbelm. Tihs is bcuseae the huamn mnid deos not raed ervey lteter by istlef, but the wrod as a wlohe. Amzanig huh? yaeh and I awlyas tghuhot slpeling was ipmorantt!
Final Final Word - Congratulations to one of our own

David Burrescia, our Western Accounts Representative will wed Donna Bonini of Glendora, California on
November 5, 2005.
Donna is the Western Credit Manager of Cemex, worldwide producer of cement, ready-mix concrete and aggregates.
We at RBI wish them the best.
We
Get It Done.
RBI Connections is a publication of RBI Bearing, Inc and is intended to provide useful company and/or industry news and information. We understand and respect your need for privacy. Email addresses in our files are from our customers or published materials. Please accept our apologies if you believe this email to be unsolicited. We are sorry for the inconvenience. Any personal information provided to us will be stored in a secure environment and will not be misused. RBI Bearing, Inc. does not make email addresses available to third parties for their use. RBI Bearing would like to send news releases and special promotions to you from time to time. If you would not like to receive these emails from us, please click this link and type the word "unsubscribe" in the subject. © 2005 RBI Bearing, Inc. |