# Need info on ball bearing numbers **URL:** \ **Category:** Factual Questions\ **Created:** [January 6, 2013, 12:55pm UTC](https://boards.straightdope.com/t/need-info-on-ball-bearing-numbers/646254 "2013-01-06T12:55:29Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![bardos](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/bardos/32/1069_2.png) [@bardos](https://boards.straightdope.com/u/bardos)\ **Post date:** [January 6, 2013, 12:55pm UTC](https://boards.straightdope.com/t/need-info-on-ball-bearing-numbers/646254/1 "2013-01-06T12:55:29Z")
I need to purchase 2 ball bearings for a cement mixer. The number on the original bearings is “6007 2RSR C3”. I understand that the first number (or any number in first position) indicates that it is a metric bearing (the 6). I understand that the second number, the zero, indicates “extra light”. Does this mean it is lightweight, as in not heavy duty with a short lifespan? I have had this cement mixer for upwards of 20 years and I have replaced these bearings twice before. I was wondering if I could buy bearings of the same exact size but heavier duty that would last longer. the chart I looked at on the internet gave the following ratings. 0 Extra light 1 Extra light thrust 2 Light 3 Medium 4 Heavy So would a bearing of number 6307 2RSR C3 be the same exact bearing but longer-lasting? I need a crash course here from someone who knows. thanks ---
**Author:** ![Snnipe\_70E](https://avatars.discourse-cdn.com/v4/letter/s/b5a626/32.png) [@Snnipe\_70E](https://boards.straightdope.com/u/Snnipe_70E)\ **Post date:** [January 6, 2013, 6:50pm UTC](https://boards.straightdope.com/t/need-info-on-ball-bearing-numbers/646254/2 "2013-01-06T18:50:17Z")
Ask at a bearing supply house. A stronger bearing may be a littler larger so you may have to purchase a new bearing and a new block. And mountiing holes. ---
**Author:** ![bardos](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/bardos/32/1069_2.png) [@bardos](https://boards.straightdope.com/u/bardos)\ **Post date:** [January 6, 2013, 6:58pm UTC](https://boards.straightdope.com/t/need-info-on-ball-bearing-numbers/646254/3 "2013-01-06T18:58:07Z")
Wow, false alarm. I just took the assembly apart, the place where the axle is welded to the drum is totally rusted out and bent out of shape. It’s a new drum or a new mixer. Dang! ---
**Author:** ![jz78817](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/jz78817/32/1028_2.png) [@jz78817](https://boards.straightdope.com/u/jz78817)\ **Post date:** [January 6, 2013, 7:09pm UTC](https://boards.straightdope.com/t/need-info-on-ball-bearing-numbers/646254/4 "2013-01-06T19:09:06Z")
irrelevant as it may be now, but a 6307 is physically larger than a 6007 (18mm larger OD and 7mm wider.) is this the chart you found? [http://www.gizmology.net/bearings.htm](http://www.gizmology.net/bearings.htm) ---
**Author:** ![bardos](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/bardos/32/1069_2.png) [@bardos](https://boards.straightdope.com/u/bardos)\ **Post date:** [January 6, 2013, 7:13pm UTC](https://boards.straightdope.com/t/need-info-on-ball-bearing-numbers/646254/5 "2013-01-06T19:13:55Z")
> [@jz78817](#): > > irrelevant as it may be now, but a 6307 is physically larger than a 6007 (18mm larger OD and 7mm wider.) > > is this the chart you found? > > [http://www.gizmology.net/bearings.htm](http://www.gizmology.net/bearings.htm) yes, it was that one. Anyway, need a new one… ☹