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Precision spindle deep groove ball bearing, 55 x 100 x 21 mm, open, straight bore, ISO 6211 envelope, ABEC 7/9 tolerance class.
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| MFR / Brand | Fafnir |
|---|---|
| MPN | RMM211RPB |
| Model | RMM 211 RPB / MM211K / ABEC7 6211P4 |
| Bearing Type | Ball Bearing |
| ID | 55 mm |
| OD | 100 mm |
| Condition | Seller refurbished |
|---|---|
| Base Number | MM211K |
| Condition Note | Made In USA, Bearing Has Previous Mounting Marks, Like New |
| Overall Width | 21 mm |
| Mpn Variants | RMM211RPB; R-MM-211-RPB; R MM 211 RPB; MM211RPB; MM211K; 6211-P4 |
| Precision Class | ABEC 7/9 / P4S |
| Series | 200K |
| Rolling Elements | Ball |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Bearing Material | Chrome steel |
| Cross Reference 1 | FAG 6211-P4 |
|---|---|
| Cross Reference 2 | NSK 6211P4 |
| Cross Reference 3 | NTN 6211P4 |
| Cross Reference 4 | Koyo 6211P4 |
| Cross Reference 5 | Timken MM211K |
| Cross Reference 6 | 6211 (related size, standard tolerance Conrad type) |
Fafnir RMM211RPB, a precision spindle deep groove ball bearing. Bore Diameter: 55 mm. Outside Diameter: 100 mm. Overall Width: 21 mm. Rolling Elements: Ball. Number Of Rows: 1. Bore Type: Straight. Closure Type: Open. Precision Class: ABEC 7/9 / P4S. Bearing Material: Chrome steel. Series: 200K. Base Number: MM211K.
MM — Fafnir super-precision spindle range, ground to ABEC 7/9 (P4S) tolerances.
211 — 200 medium dimension series, bore code 11, which maps to the ISO 6211 envelope: 55 mm bore, 100 mm outside diameter, 21 mm width.
Precision Class: ABEC 7/9 / P4S holds bore, outside diameter and running accuracy to super-precision limits, which keeps radial and axial runout low enough for machine tool spindle work. Closure Type: Open, so the housing feeds oil or grease straight to the ball path and the bearing runs cooler at speed than a shielded execution on the same envelope.
Unit Quantity: 1 Pc. One single-row bearing.
The envelope is the ISO 6211 envelope, 55 x 100 x 21 mm. FAG 6211-P4, NSK 6211P4, NTN 6211P4 and Koyo 6211P4 are the direct tolerance-class equivalents, and Timken MM211K is the same geometry in Timken’s current numbering. A standard-tolerance 6211 shares the envelope in a looser accuracy class. Searchable variants include RMM211RPB, R-MM-211-RPB, R MM 211 RPB, MM211K and 6211-P4.
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