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Super-precision angular contact ball bearing, 60 x 110 x 22 mm, open, machined phenolic outer-ring land-riding cage, P4S precision, universally ground.
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| MFR / Brand | Fafnir |
|---|---|
| MPN | MM212WI |
| Model | MM 212 WI ACR / ABEC7 / 7212-A5 |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 60 mm |
| OD | 110 mm |
| Width | 22 mm |
| Condition | New – Open box |
|---|---|
| Base Number | MM212WI |
| Industry Terms | Super precision spindle bearing, machine tool spindle bearing, Fafnir 200WI series |
| Condition Note | Made In USA, New Old Stock |
| Bore Shaft Size | 60 mm |
| Mpn Variants | MM212WI, MM 212 WI, MM-212-WI, MM212WIACR, MM-212-WI-ACR, MM212WI-CR |
| Manufacturer Status | New old stock, original carton |
| Precision Class | P4S |
| Material | Bearing Steel |
| Cage Type | Outer-ring land-riding, machined |
| Precision Rating | P4S (ABEC 7/9) |
| Series | 212 (Fafnir 200WI) |
| Rolling Elements | Balls |
| Max Temp | 120°C |
| Cage Material | Phenolic |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Design Units | Metric |
| Bearing Material | Bearing Steel |
| Part Number | MM212WI |
| Cross Reference 1 | ISO 7212 envelope (60 x 110 x 22 mm) |
|---|---|
| Cross Reference 2 | 2MM212WI (related size, 15° contact angle) |
| Cross Reference 3 | 3MM212WI (related size, 25° contact angle) |
| Cross Reference 4 | 7212 (related size, standard precision) |
Fafnir MM212WI super-precision angular contact ball bearing, built by The Timken Company. Series: 212 (Fafnir 200WI spindle series). Bore: 60 mm. Outside Diameter: 110 mm. Overall Width: 22 mm. Precision Class: P4S. Cage Material: Phenolic. Cage Type: Outer-ring land-riding, machined. Number Of Rows: 1. Rolling Elements: Balls. Closure Type: Open. Bore Type: Straight. Bearing Material: Bearing steel. Country of Origin: United States. Condition: new old stock, original carton.
MM is the Fafnir super-precision spindle prefix, and it carries Precision Class: P4S — running accuracy to ABEC 9 with the remaining features held to ABEC 7. 212 sets the 200WI dimension series at a 60 mm bore, giving the 60 x 110 x 22 mm envelope shared with an ISO 7212. WI marks the metric super-precision spindle range. CR is the phenolic cage that rides on the outer-ring land, which keeps cage mass low and lets the cage carry lubricant into the ball track.
P4S is the grade specified for machine-tool spindles: bore and outside-diameter tolerances and raceway runout are held tight enough that shaft position stays repeatable at speed. The phenolic cage runs quieter and cooler than a machined brass cage at high rotational speeds and sets a 120 °C ceiling on continuous running temperature. An open bearing takes its lubricant from the spindle system, which suits oil-air and oil-mist feeds as well as grease.
Unit Quantity: 1 Pc. One single bearing ships. Carton and cross designations, all recorded as search terms: MM212WI, MM 212 WI, MM-212-WI, MM212WIACR, MM-212-WI-ACR, MM212WI-CR.
The 60 x 110 x 22 mm envelope drops into any housing bored for an ISO 7212. Shaft and housing abutment faces bear on the ring faces, and the phenolic cage sets the continuous temperature limit at 120 °C.
Envelope match, 60 x 110 x 22 mm: ISO 7212 in every maker’s numbering. A 2MM212WI is a related size at a 15° contact angle and a 3MM212WI a related size at 25°; both share this envelope and neither is the same part. A plain 7212 in standard precision shares the envelope at ordinary tolerance.
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