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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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1 in stock
Matched duplex pair of super-precision angular contact ball bearings, 55 x 100 x 21 mm, 25° contact angle, phenolic cage, heavy preload.
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 3MM211WIDUH |
| Model | 3 MM 211 WI CR DUH / ABEC7 / 7211A5 P4 / 7211AC |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 55 mm |
| OD | 100 mm |
| Width | 21 mm |
| Material | Bearing Steel |
|---|---|
| Series | 200 |
| Base Number | 3MM211WI |
| Industry Terms | Spindle bearing, machine tool bearing, super precision angular contact, matched duplex pair, DUH set, 7211 |
| Common Misspellings | Fafner, Faffnir, 3MM211W1, 3MM 211 WL, 3MM211WI DUII |
| Bore Shaft Size | 55 mm |
| Mpn Variants | 3MM211WI-DUH, 3MM211WIDUH, 3MM 211 WI DUH, 3MM-211-WI-CR-DUH, 7211A5 P4S, 7211AC, 7211A, 3MM211WI |
| Rolling Elements | Ball |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.10.50.68 |
| Part Number | 3MM211WI-DUH |
Fafnir 3MM211WI-DUH matched duplex pair of super-precision angular contact ball bearings, 200 series. Brand: Fafnir (Timken). Part Number: 3MM211WI-DUH. Bore: 55 mm. Outside Diameter: 100 mm. Overall Width: 21 mm per bearing. Design Units: Metric. Number Of Rows: 1 per bearing. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. Bearing Material: Chrome bearing steel. Item Weight: 1.34 lbs.
Contact Angle: 25°. Precision Class: P4S. Precision Rating: ABEC 7/9. Cage Material: Phenolic. Cage Type: Machined, outer-ring land-riding. Preload: Heavy. Arrangement / Configuration: Matched duplex pair, universally ground. Series: 200, carrying the ISO 7211 envelope. The 3MM prefix marks the 25° super-precision execution.
Dynamic Load Rating: 56.5 kN. Static Load Rating: 39.5 kN. Limiting Speed: 12000 rpm. A 25° contact angle carries more thrust and locates the shaft more stiffly along its axis than a 15° bearing on the same envelope, which suits a spindle nose position where cutting load drives deflection. The heavy preload class raises axial and radial stiffness further. The machined phenolic cage rides on the outer ring land, staying centred at speed and holding lubricant against the ball pockets. Max Temp: 120°C. Min Temp: -30°C. Internal Clearance: N/A — the pair is set by preload rather than by clearance.
Unit Quantity: 2 Pcs. Mounting Arrangement: Universal. The two bearings are ground as a matched set, so mounting them against one another produces the heavy preload class directly, with no shims and no regrinding. Universal grinding also allows a back-to-back, face-to-face or tandem stack. Total Width: 42 mm for the pair as mounted.
Cross-References: SKF 7211 ACD/P4ADGC, FAG B7211-E-T-P4S-DUH, NSK 7211A5TRDUHP4, Timken 7211AC. Each is a 25° heavy-preload duplex set on the 55 x 100 x 21 mm envelope. Harmonization Code: 8482.10.50.68.
MPN Variants: 3MM211WI-DUH, 3MM211WIDUH, 3MM 211 WI DUH, 3MM-211-WI-CR-DUH, 7211A5 P4S, 7211AC, 7211A, 3MM211WI.
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