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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Fafnir 3MM9309WI-DUM Bearing – Optimal Performance and Precision Experience unparalleled quality with the Fafnir 3MM9309WI-DUM Bearing, a premier choice for enthusiasts and professionals alike. With precise dimensions of 45x68x12 mm, this Angular Contact Ball Bearing is expertly designed to reduce friction, ensuring smooth operation and durability even in high-speed applications. Key Features: Brand: FAFNIR – A trusted name known for exceptional quality and precision. Type: Angular Contact Ball Bearing – Ideal for applications demanding high load capacities. Model: 3MM 9309 WI CR DUM – Compatible with multiple specifications, including 71909 E T DUM P4 and 7909A5 71909ACD. Origin: Proudly made in the USA – Ensuring superior craftsmanship and reliability. This bearing is perfect for a range of mechanical needs, offering both durability and performance. All products are brand new and come with a commitment to quality. We also provide competitive pricing, combined shipping options, and same-day shipping on all items, with next-day shipping available at checkout. For any specific inquiries or if you require assistance in finding the right part, please do not hesitate to reach out. We are dedicated to fulfilling all your bearing needs!
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 3MM9309WICRDUM |
| Model | 3MM 9309 WI CR DUM / 71909 E T DUM P4 / 7909A5 71909ACD |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 45 mm |
| OD | 68 mm |
| Width | 12 mm |
| Advertise | 1 |
|---|---|
| Category 1 | Ball & Roller Bearings |
| Category 2 | Bearings & Bushings |
| Category 3 | Business & Industrial |
| Category 4 | Industrial Automation & Motion Controls |
| Category 5 | Mechanical Power Transmission |
| Material | Bearing Steel |
| Min Temp | -40 °C |
| Cage Type | Phenolic |
| Dynamic Load Rating | 14.9 kN |
| Static Load Rating | 9.6 kN |
| Precision Rating | ABEC 7 / P4 |
| Series | 3MM9300 |
| Rolling Elements | Ball |
| Max Temp | 120 °C |
| Condition | New |
| Item Weight | 0.60 lbs |
| Cage Material | Phenolic Resin |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Harmonization Code | 8482.10.50 |
| Contact Angle | 25 °C |
| Preload | Medium |
| Mounting Arrangement | Universal |
| Internal Clearance | CN |
| Cross Reference 1 | SKF 71909 ACD/P4ADGB |
|---|---|
| Cross Reference 2 | NSK 7909A5TYNDUMP4 |
| Cross Reference 3 | FAG B71909-E-T-P4S-DUM |
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