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Precision spindle deep groove ball bearing, 55 x 90 x 18 mm, open, straight bore, machined bronze cage, ABEC 7/9 tolerance class.
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| MFR / Brand | Fafnir |
|---|---|
| MPN | AAMM9111-2SMBR |
| Model | AA MM 9111-2 S MBR / 305376-5 EXP13001 / ABEC7 / 6011P4 |
| Bearing Type | Precision Ball Bearing |
| ID | 55 mm |
| OD | 90 mm |
| Condition | New – Open box |
|---|---|
| Base Number | MM9111K |
| Condition Note | Made In USA, New Old Stock |
| Overall Width | 18 mm |
| Mpn Variants | AAMM9111-2SMBR; AA-MM-9111-2-SMBR; AA MM 9111 2 SMBR; MM9111MBR; MM9111K; 6011-P4; 305376-5 |
| Precision Class | ABEC 7/9 / P4S |
| Cage Type | Machined |
| Series | 9100K |
| Rolling Elements | Ball |
| Cage Material | Bronze |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Cross Reference 1 | FAG 6011-P4 |
|---|---|
| Cross Reference 2 | NSK 6011P4 |
| Cross Reference 3 | NTN 6011P4 |
| Cross Reference 4 | Koyo 6011P4 |
| Cross Reference 5 | Timken MM9111K (related, phenolic cage execution) |
| Cross Reference 6 | 6011 (related size, standard tolerance Conrad type) |
Fafnir AAMM9111-2-SMBR, a precision spindle deep groove ball bearing with a machined bronze cage. Bore Diameter: 55 mm. Outside Diameter: 90 mm. Overall Width: 18 mm. Rolling Elements: Ball. Number Of Rows: 1. Bore Type: Straight. Closure Type: Open. Cage Material: Bronze. Cage Type: Machined. Precision Class: ABEC 7/9 / P4S. Series: 9100K. Base Number: MM9111K.
MM — Fafnir super-precision spindle range, ground to ABEC 7/9 (P4S) tolerances.
9111 — the 9100 light dimension series, bore code 11, which maps to the ISO 6011 envelope: 55 mm bore, 90 mm outside diameter, 18 mm width.
MBR — machined bronze cage.
305376-5 — the customer drawing reference marked on the carton.
Cage Material: Bronze, machined rather than pressed. A machined bronze cage tolerates higher temperature and poorer lubrication than phenolic and holds ball spacing under shock, which is why it is specified on spindles that see intermittent or marginal lubrication. Precision Class: ABEC 7/9 / P4S holds bore, outside diameter and running accuracy to super-precision limits. Closure Type: Open, so the housing feeds oil or grease straight to the ball path.
Unit Quantity: 1 Pc. One single-row bearing.
The envelope is the ISO 6011 envelope, 55 x 90 x 18 mm, in a super-precision execution. A P4-class 6011 from FAG, NSK, NTN or Koyo occupies the same seat, and Timken MM9111K is the same geometry in the standard phenolic-cage form. A machined bronze cage is a special execution, so a phenolic or pressed-steel equivalent is a related part rather than a like-for-like substitution. Searchable variants include AAMM9111-2SMBR, AA-MM-9111-2-SMBR, AA MM 9111 2 SMBR, MM9111MBR, MM9111K, 6011-P4 and 305376-5.
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