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Super-precision single-row angular contact ball bearing, 140 mm bore x 210 mm OD x 33 mm wide, 15° contact angle, light preload, ABEC 7/9. Sold as 1 Pc.
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 2MM9128WISUL |
| Model | 2MM-9128-WI-SUL 7028C |
| Bearing Type | Angular Contact Ball Bearing |
| ID | 140 mm |
| OD | 210 mm |
| Width | 33 mm |
| Material | Bearing Steel |
|---|---|
| Condition | New – Open box |
| Base Number | 2MM9128WI |
| Industry Terms | super precision spindle bearing, machine tool bearing, large bore angular contact, ABEC 9 bearing |
| Common Misspellings | 2MM9128WISUL, 2MM 9128 WI SUL, Fafner, Faffnir, 2MM9128W1-SUL |
| Application Types | Machine tool spindles, grinding spindles, precision gearboxes, rotary tables |
| Condition Note | Made In USA, New Old Stock |
| Bore Shaft Size | 140 mm (5.512 in) |
| Mpn Variants | 2MM9128WI-SUL, 2MM-9128-WI-SUL, 2MM9128WISUL, 2MM 9128 WI SUL, 2MM9128WI-CR-SUL, 7028-C |
| Arrangement Configuration | SU — single universally ground, stackable DB / DF / DT |
| Precision Class | P4S — ABEC 7 dimensional / ABEC 9 running accuracy |
| Dynamic Load Rating | 144.5 kN |
| Static Load Rating | 124.5 kN |
| Number Of Rows | 1 |
| Contact Angle | 15° |
| Preload | Light (L) |
| Design Units | Metric |
| Part Number | 2MM9128WI-SUL |
| Cross Reference 1 | RHP 7028CTSULP4 |
|---|---|
| Cross Reference 2 | FAG B7028C.T.P4S.UL |
| Cross Reference 3 | SKF 7028 CD/P4A |
| Cross Reference 4 | NSK 7028CTRSULP4 |
A Fafnir 2MM9128WI-SUL super-precision single-row angular contact ball bearing. Bore 140 mm, outside diameter 210 mm, width 33 mm. Open on both faces, universally ground.
2MM — 15° contact angle in the Fafnir scheme; the MM prefix carries the P4S build9128 — leading 9 marks the ISO 70 light series, 140 mm bore, so the ISO equivalent is 7028-CWI — super-precision spindle bearing seriesSU — single universally groundL — light preload
P4S covers ABEC 7 dimensional tolerance with ABEC 9 running accuracy. At 140 mm bore the 70 light section keeps the outside diameter down and the speed ceiling up compared with a 72-series bearing on the same shaft. The 15° angle favours speed and radial stiffness; light preload runs coolest of the three grades.
Bore: 140 mmOutside diameter: 210 mmWidth: 33 mmContact angle: 15°Precision: P4S — ABEC 7 / ABEC 9Preload: lightRows: 1Closure: open
Single universally ground bearing. 1 Pc per sale unit.
Thrust is carried in one direction only, so the bearing runs against an opposing bearing or a housing shoulder. The wide outer-ring land is the thrust face and its orientation sets the arrangement.
Same-spec equivalents at 15°, super precision, light preload: RHP 7028CTSULP4, FAG B7028C.T.P4S.UL, SKF 7028 CD/P4A, NSK 7028CTRSULP4. The 25° 3MM9128WI and FAG B7028E share the envelope at a different contact angle and are related sizes rather than interchanges.
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