Motor Starters vs. Contactors vs. Overload Relays: What Each One Does and Why You Need All Three
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Availability:
5 in stock
Matched duplex pair of super precision angular contact ball bearings, 60 x 110 x 22 mm, 15° contact angle, medium preload, phenolic cage.
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$73.64
5 in stock
5 in stock
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 2MM212WIDUM |
| Model | 2 MM 212 WI DUM / ABEC7 / 7212C P4 DUM |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 60 mm |
| OD | 110 mm |
| Width | 22 mm |
| Material | Steel |
|---|---|
| Series | 200 |
| Condition | New – Open box |
| Lubricant | Oil Preservative |
| Preload | Medium preload |
| Base Number | 2MM212WI |
| Condition Note | Made In USA, New Old Stock, Stained |
| Bore Shaft Size | 60 mm |
| Mpn Variants | 2MM212WI-DUM, 2MM-212-WI-CR-DUM, 2MM212WICRDUM, 2 MM 212 WI DUM, 7212C P4 DUM |
| Rolling Elements | Ball |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.10.50 |
| Part Number | 2MM212WIDUM |
Fafnir 2MM212WI-DUM super precision angular contact ball bearing, supplied as a matched duplex pair. Bore: 60 mm. Outside Diameter: 110 mm. Overall Width: 22 mm per bearing. Contact Angle: 15°. Precision Class: P4S, ABEC 7/9. Preload: Medium. Internal Clearance: N/A. Number Of Rows: 1 per bearing. Rolling Elements: Steel balls. Bore Type: Straight. Closure Type: Open. Cage Material: Phenolic. Cage Type: Outer-ring land-riding. Series: 200, ISO equivalent 7212C. Dynamic Load Rating: 72.5 kN / 16300 lbf. Static Load Rating: 48.9 kN / 11000 lbf. Limiting Speed: 13200 rpm. Item Weight: 1.83 lbs. Unit Quantity: 2 Pc.
2MM: 15° contact angle in Fafnir’s super precision range. 212: 60 mm bore in the 200 series, ISO 7212. WI: spindle-quality inner-ring execution. CR: phenolic cage riding on the outer ring land. DUM: two universally ground bearings matched as a duplex set at medium preload. Searchable variants: 2MM212WIDUM, 2MM212WI-DUM, 2MM-212-WI-CR-DUM, 2MM212WICRDUM, 7212C P4 DUM.
A 15° contact angle favours speed and radial stiffness, so the pair suits a machine tool spindle running fast with a moderate thrust component. Medium preload sets axial stiffness and keeps the balls in defined contact through load reversal. P4S tolerances hold bore, outside diameter and runout tighter than P4 on the critical features, which is what holds a spindle’s repeatability. The phenolic cage is light and outer-land guided, so cage load and heat stay low at speed.
Unit Quantity: 2 Pc. One matched duplex pair, universally ground, medium preload. Mounting Arrangement: Duplex, back-to-back, face-to-face or tandem.
Clamping the ground faces together sets the preload, with no shims or spacers. Lubricant on arrival: oil preservative. Phenolic cages run to 120 °C.
Same envelope, angle and preload class: SKF 7212 CD/P4ADGB and NSK 7212CTRDUMP4. A 25° execution on the same envelope, such as a Fafnir 3MM212WI, is a related size rather than a substitute.
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