Motor Starters vs. Contactors vs. Overload Relays: What Each One Does and Why You Need All Three
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Availability:
2 in stock
Super-precision angular contact ball bearing, 65 x 120 x 23 mm, phenolic outer-land-riding cage, open, single bearing. 1 Pc.
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$76.49
2 in stock
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| MFR / Brand | Fafnir |
|---|---|
| MPN | MM213WICR |
| Model | MM 213 WI CR / 7213 B P4 |
| Bearing Type | Angular Contact Ball Bearing |
| Width | 23 mm |
| Condition | New |
|---|---|
| Base Number | 7213 |
| Industry Terms | Spindle bearing; super precision bearing; machine tool bearing; ABEC 7 angular contact |
| Common Misspellings | Fafner; Faffnir; Fanfir; MM213W1; MM213WLCR |
| Application Types | Machine tool spindles; grinding spindles; high-speed gearboxes; precision rotary tables |
| Bore Shaft Size | 65 mm (2.5591 in) |
| Mpn Variants | MM213WICR; MM213WI; MM-213-WI-CR; MM 213 WI CR; MM213WI-CR |
| Manufacturer Status | Fafnir is the Timken super-precision line |
| Arrangement Configuration | Single bearing, not a ground matched set |
| Precision Class | P4S (ABEC 7 dimensional, ABEC 9 running accuracy) |
| Cage Material | Phenolic (CR) |
| Number Of Rows | 1 |
| Design Units | Metric |
| Part Number | MM213WICR |
| Cross Reference 1 | 7213 |
|---|---|
| Cross Reference 2 | 7213B P4 |
| Cross Reference 3 | MM213WI |
A Fafnir MM213WI-CR super-precision angular contact ball bearing, 65 mm bore by 120 mm outside diameter by 23 mm wide, open on both faces, with a phenolic cage riding on the outer ring land. Fafnir is Timken’s super-precision spindle bearing line and WI is its single-row angular contact spindle family. The ISO equivalent envelope is the 7213 size.
The MM prefix denotes P4S precision, which is ABEC 7 on dimensional tolerances with ABEC 9 running accuracy. With no 9 ahead of the size block the bearing sits in the ISO 72 dimension series and the bore code 213 gives 65 mm. WI identifies the super-precision angular contact family and CR the phenolic outer-land-riding cage. There is no SU or DU block in the designation, so the bearing is furnished as a single unit rather than as part of a ground matched set.
P4S is a machine-tool class: form and running accuracy are held tight enough that the bearing itself is not the limit on spindle runout. The one-piece phenolic cage running on the outer ring land is light, quiet and self-lubricating, which is what allows the family to run at spindle speeds, and it sets a lower temperature ceiling than a brass cage would. Angular contact geometry takes radial load together with thrust in one direction, so the bearing is located axially by whatever opposes it in the spindle.
1 Pc. Single bearing, not a ground matched set, and supplied without preload spacers or a mating bearing.
The bearing is fitted clean, to a P4S shaft and housing fit, and clamped fully against its shoulders. Where it runs against a second angular contact bearing, the thrust faces are set to oppose each other and the axial setting is established by ground spacers or by the housing geometry.
A direct interchange has to match this size, the P4S class and the contact angle marked on the ring. The 7213 envelope is also produced in 15°, 25° and 40° angles, and those are related sizes rather than substitutions because the split between radial and axial capacity moves with the angle. The Fafnir 2MM213WI is the 15° version of this size and the 3MM213WI the 25° version.
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