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Deep Groove Ball Bearings: The Industry Default and When to Reach for Something Else
If you pulled a bearing off general industrial equipment at random, there’s a good chance
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2 in stock
Matched duplex pair of super-precision angular contact spindle bearings, 20 x 42 x 12 mm each, 24 mm total width, 25° contact angle, ISO P4S, light preload.
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 3MM9104WI DUL |
| Model | 3MM9104WI-DUL |
| Bearing Type | Angular Contact Ball Bearing |
| ID | 20 mm |
| OD | 42 mm |
| Width | 12 mm |
| Base Number | 3MM9104WI |
|---|---|
| Total Width | 24 mm (duplex pair) |
| Bore Shaft Size | 20 mm |
| Mpn Variants | 3MM9104WI-DUL; 3MM9104WICRDUL; 3MM 9104 WI CR DUL; 7004E-T-P4S-DUL |
| Arrangement Configuration | Matched duplex pair |
| Precision Class | ABEC 7/9 |
| Dynamic Load Rating C1 | 11100 N (2500 lbf) per bearing |
| Cage Type | CR – Phenolic Outer Land Riding Cage |
| Dynamic Load Rating | 11100 N (2500 lbf) per bearing |
| Static Load Rating | 5700 N (1290 lbf) per bearing |
| Precision Rating | ISO P4S (ABEC 7/9) |
| Series | 9100 |
| Cage Material | Phenolic |
| Limiting Speed | 36500 |
| Number Of Rows | 2 |
| Bore Type | Straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.10.50.68 |
| Contact Angle | 25° |
| Preload | Light |
| Design Units | Metric |
| Bearing Class | P4S |
| Part Number | 3MM9104WICRDUL |
| Cross Reference 1 | Timken 7004E-T-P4S-DUL - Timken world part number for this set |
|---|---|
| Cross Reference 2 | FAG B7004-E-T-P4S-UL - 25 deg, phenolic cage, light preload |
| Cross Reference 3 | NSK 7004A5TYNDULP4 - 25 deg, TYN polyamide cage, light preload |
| Cross Reference 4 | SKF 7004 ACDGA/P4A - 25 deg, extra light preload |
Fafnir 3MM9104WI-DUL matched duplex pair of super-precision angular contact spindle ball bearings, built by The Timken Company. Series: 9100WI. Bore: 20 mm. Outside Diameter: 42 mm. Bearing Width: 12 mm per bearing. Total Width: 24 mm for the pair. Contact Angle: 25°. Precision Rating: ISO P4S (ABEC 7/9). Preload: Light. Cage Type: CR – Phenolic Outer Land Riding Cage. Cage Material: Phenolic. Rolling Elements: steel balls. Bore Type: Straight. Closure Type: Open. Rows per Set: Duplex. Design Units: Metric. Timken’s world part number for this set is 7004E-T-P4S-DUL.
The 3MM prefix gives a 25° contact angle and ISO P4S accuracy. 9104 in the 9100WI series is the ISO 7004 envelope. WI denotes a low shoulder on both rings. CR is the phenolic outer-land-riding cage. DU marks a duplex set, and the trailing L sets light preload.
Dynamic Radial Load Rating (C1): 11,100 N (2,500 lbf) per bearing. C1 ISO Dynamic Radial Rating per row: 10,100 N (2,270 lbf). Static Radial Load Rating (C0): 5,700 N (1,290 lbf) per bearing. Limiting Speed – Grease: 36,500 rpm. Limiting Speed – Oil: 66,800 rpm. A 25° contact angle carries more thrust and less speed than a 15° bearing on the same envelope. Light preload adds the least heat of the three grades, which is what keeps a small-bore pair running into the high tens of thousands of rpm.
Unit Quantity: 2 Pcs. Arrangement / Configuration: Matched duplex pair. Total Width: 24 mm assembled. The two bearings are ground as a set and mount together at the published light preload.
Max Shaft Fillet Radius: 0.6 mm (0.024 in). Outer Ring To Clear Radius: 0.6 mm (0.024 in). Shaft Backing Shoulder Diameter: 24.8 mm (0.980 in). Housing Backing Shoulder Diameter: 37.7 mm (1.490 in).
Closest first: Timken 7004E-T-P4S-DUL (Timken’s world part number for this set), FAG B7004-E-T-P4S-UL (25°, phenolic cage, universal light preload), NSK 7004A5TYNDULP4 (25°, TYN polyamide cage, light preload duplex) and SKF 7004 ACDGA/P4A (25°, extra light preload). Searchable forms of the designation: 3MM9104WIDUL, 3MM9104WI-DUL, 3MM 9104 WI CR DUL, 7004A.
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