Ball Bearings vs. Roller Bearings: Which One Does Your Application Actually Need?
Both ball bearings and roller bearings serve the same fundamental purpose: reducing friction, supporting loads,

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The Fafnir 2MM9121WI-DUL Bearing is a high-quality Angular Contact Ball Bearing designed for industrial applications. Made of steel with a bore diameter of 105mm, an outside diameter of 160mm, and a width of 26mm, this bearing is specifically manufactured in the United States by Timken. The 2MM 9121 WI CR DUL 7021-C model ensures reliable performance and durability, making it an ideal choice for mechanical power transmission and industrial automation systems requiring precision bearings.
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 2MM9121WIDUL |
| Model | 2MM 9121 WI CR DUL 7021-C |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 105 mm |
| OD | 160 mm |
| Width | 26 mm |
| Advertise | 1 |
|---|---|
| Material | Steel |
| Min Temp | -30 °C |
| Cage Type | Machined |
| Dynamic Load Rating | 66 kN / 14800 lbf |
| Static Load Rating | 63 kN / 14200 lbf |
| Precision Rating | ABEC 7 / P4 |
| Series | 9100 |
| Rolling Elements | Balls |
| Max Temp | 120 °C |
| Condition | New – Open box |
| Item Weight | 3.50 lbs |
| Cage Material | Phenolic |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Harmonization Code | 8482.10.50 |
| Contact Angle | 15° |
| Preload | Light |
| Mounting Arrangement | Universal |
| Cross Reference 1 | SKF 7021 CD/P4ADGA |
|---|---|
| Cross Reference 2 | NSK 7021CTYNSULP4 |
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