Miniature & Extra Small Ball Bearings
Open Type Miniature & Extra Small Ball Bearings (6mm–9mm bore)
Compact bearings for low-load, low-noise, high-speed duty.
Dimensions & Load Ratings
| Bearing No. | d (Bore) (mm) | D (Outer Dia.) (mm) | B (Width) (mm) | Dynamic Load (N) | Static Load (N) | Max. RPM | Weight (g) |
|---|---|---|---|---|---|---|---|
| 6M10 | 6 | 10 | 2.5 | 445 | 197 | 47700 | 0.55 |
| 6M12 | 6 | 12 | 3 | 643 | 263 | 45000 | 1.3 |
| 686 | 6 | 13 | 3.5 | 972 | 396 | 43200 | 1.9 |
| 696 | 6 | 15 | 5 | 1566 | 603 | 42300 | 3.9 |
| 606 | 6 | 17 | 6 | 2034 | 756 | 37800 | 6 |
| 626 | 6 | 19 | 6 | 2358 | 954 | 34200 | 8 |
| 636 | 6 | 22 | 7 | 2970 | 1224 | 30600 | 13 |
| 7M11 | 7 | 11 | 2.5 | 409 | 181 | 45000 | 0.7 |
| 7M13 | 7 | 13 | 3 | 747 | 337 | 43200 | 1.5 |
| 687 | 7 | 14 | 3.5 | 1053 | 459 | 40500 | 2 |
| 697 | 7 | 17 | 5 | 1449 | 643 | 37800 | 4.8 |
| 607 | 7 | 19 | 6 | 2358 | 954 | 36000 | 8 |
| 627 | 7 | 22 | 7 | 2970 | 1224 | 32400 | 12 |
| 637 | 7 | 26 | 9 | 3600 | 1422 | 27000 | 24 |
| 8M12 | 8 | 12 | 2.2 | 481 | 244 | 43200 | 0.7 |
| 8M14 | 8 | 14 | 3.5 | 738 | 346 | 40500 | 1.9 |
| 688 | 8 | 16 | 4 | 1125 | 531 | 38700 | 3 |
| 698 | 8 | 19 | 6 | 2016 | 814 | 37800 | 7.2 |
| 608 | 8 | 22 | 7 | 2970 | 1224 | 34200 | 12 |
| 628 | 8 | 24 | 8 | 3015 | 1269 | 30600 | 17 |
| 638 | 8 | 28 | 9 | 4095 | 1773 | 25200 | 27 |
| 689 | 9 | 17 | 4 | 1557 | 729 | 36900 | 5.8 |
| 699 | 9 | 20 | 6 | 1908 | 886 | 36000 | 7.7 |
| 609 | 9 | 24 | 7 | 3015 | 1269 | 32400 | 16 |
| 629 | 9 | 26 | 8 | 4095 | 1773 | 28800 | 20 |
| 639 | 9 | 30 | 10 | 4590 | 2151 | 23400 | 34 |
Dimensions and load ratings per manufacturer technical catalogue. Speed ratings shown are for oil lubrication — for grease lubrication, use 75% of the indicated value.
Request Quote for MX-3 SeriesTypical Applications
- Instruments, medical and dental equipment
- Small motors, fans and office machines
- Precision spindles and measuring devices
- Model, hobby and light-duty mechanisms
About Miniature & Extra Small Ball Bearings
Deep groove ball bearings with an outside diameter below 9 mm are known as miniature ball bearings. Those with an outside diameter above 9 mm and a bore below 10 mm are known as extra small ball bearings.
They are available across the ISO standard plan and can be made to special dimensional requirements within basic design limitations.
- Capable of carrying relatively smaller loads
- Suitable for low, medium and high speed applications
- Suited for low noise and low torque applications
Available Variants
- Open basic design types
- Sealed types
- Flange types
- With snap ring groove
- With snap ring groove and snap ring
- With C2, CN, C3, C4 radial clearance
- Standard precision grade (ISO Grade 0 – ABEC1) and higher precision grade (ISO Grade 1 – ABEC3)
- With extended inner ring
- Pressed steel and riveted cage
Suffix Codes
Add these suffixes to the bearing number to specify seals, clearance, cage and precision options.
| Suffix | Meaning |
|---|---|
| C2 | Radial internal clearance less than normal. |
| CN | Normal radial internal clearance. Generally, no special suffix is used for normal radial internal clearance. |
| C3 | Radial internal clearance higher than normal. |
| C4 | Radial internal clearance higher than C3. |
| N | Snap ring groove in the outer ring. |
| NR | Snap ring groove in the outer ring, with snap ring. |
| P5 | Dimensional and running accuracy conforming to ISO class 5. |
| P6 | Dimensional and running accuracy conforming to ISO class 6. |
| RS | Rubber seal on one side of the bearing. |
| 2RS | Rubber seals on both sides of the bearing. |
| Z | Metallic shield on one side of the bearing. |
| ZZ | Metallic shields on both sides of the bearing. |
| F | Used as a prefix for a flange on the outer ring. |
Frequently Asked Questions
What sizes are available in the MX-3 series?
MX-3 series bearings are available from 6mm – 9mm bore, as listed in the dimension table on this page. Each size has its own bearing number for ordering.
What load ratings apply to MX-3 bearings?
Dynamic and static load ratings vary by size — see the table for the exact rating per bearing number. Larger sizes carry proportionally higher load ratings.
What is the MX-3 series typically used for?
Common applications include instruments, medical and dental equipment and small motors, fans and office machines, and similar general industrial equipment.
Are flanged and sealed miniature bearings available?
Yes. Miniature and extra small bearings are available in open, shielded, sealed and flanged versions — share your requirement in a quote request.
Can I order MX-3 series bearings with special options?
Yes. Many options are available — see the variants and suffix codes on this page — subject to design and manufacturing constraints. Share your requirement in a quote request.
Need pricing on MX-3 series bearings?
Share your size and quantity — our technical team will confirm availability and pricing within one business day.