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Super-precision angular contact ball bearings, 45 x 85 x 19 mm, 15° contact angle, medium preload, ABEC 7/9 P4S. Open, machined phenolic cage.
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 2MM209WIDUM |
| Model | 2 MM 209 WI CR DUM / 7209C T DUM P4 |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 45 mm |
| OD | 85 mm |
| Width | 19 mm |
| Material | Bearing Steel |
|---|---|
| Series | 7200 |
| Condition | New – Open box |
| Lubricant | Oil |
| Preload | Medium |
| Base Number | 2MM209WI |
| Industry Terms | spindle bearing set, matched duplex pair, super precision angular contact, P4S bearing, ABEC 7 bearing, phenolic cage bearing, 7209 bearing, medium preload |
| Common Misspellings | Fafnir 2MM209WI DUM, Faffnir 2MM209WIDUM, 2MM209WIDUN, 2MM209WLDUM, 2M209WIDUM, angular contct bearing 45x85x19 duplex |
| Application Types | Machine tool spindles, grinding spindles, high-speed motor spindles, precision gearboxes |
| Total Width | 38 mm |
| Condition Note | Made In USA, New Old Stock |
| Overall Width | 19 mm |
| Mpn Variants | 2MM209WIDUM, 2MM209WI-DUM, 2MM209WICRDUM, 2MM-209-WI-DUM, 2 MM 209 WI CR DUM, Timken 2MM209WICRDUM, 7209C-T-P4S-DUM, 7209C T DUM P4, 7209-C |
| Manufacturer Status | Fafnir brand now owned by Timken; current Timken super-precision spindle designation |
| Compatible With Replaces | Positions calling a 45 x 85 x 19 mm super-precision angular contact duplex pair at 15°, medium preload and P4S |
| Arrangement Configuration | Factory-matched duplex pair, universally ground |
| Precision Class | ABEC 7/9 / P4S |
| Dynamic Load Rating C1 | 45,200 N per bearing |
| Additional Attributes | C1 ISO dynamic radial rating per row: 41,100 N. Maximum shaft fillet radius: 1 mm. Shaft backing shoulder diameter: 52.3 mm. Housing backing shoulder diameter: 78.2 mm. |
| Cage Type | Machined, outer-ring guided |
| Dynamic Load Rating | 45,200 N per bearing |
| Static Load Rating | 28,800 N per bearing |
| Precision Rating | ABEC 7/9 / P4S |
| Rolling Elements | Ball |
| Cage Material | Phenolic |
| Limiting Speed | 17,500 rpm grease; 35,000 rpm oil |
| Number Of Rows | 2 |
| Bore Type | Straight |
| Harmonization Code | 8482.10.50.28 |
| Contact Angle | 15° |
| Mounting Arrangement | Universally ground duplex; mountable back-to-back, face-to-face or tandem |
| Design Units | Metric |
| Bearing Material | Chrome steel |
| Part Number | 2MM209WICRDUM |
| Cross Reference 1 | SKF 7209 CD/P4ADGB (15°, P4A, medium preload, same 45 x 85 x 19 mm envelope) |
|---|---|
| Cross Reference 2 | FAG B7209-C-T-P4S-DUM (15°, P4S, duplex medium preload, same envelope) |
| Cross Reference 3 | NSK 7209CTRDUMP4 (C = 15°, P4, duplex medium preload, same envelope) |
| Cross Reference 4 | NTN 7209UCDB/GNP4 (15°, P4, duplex, same envelope) |
| Cross Reference 5 | RHP 7209CTDUMP4 (C = 15°, P4, duplex medium preload, same envelope) |
| Cross Reference 6 | Koyo 7209C-DUMP4 (C = 15°, P4, duplex medium preload, same envelope) |
| Cross Reference 7 | Timken 7209C-T-P4S-DUM (Fafnir world part number for this set) |
| Cross Reference 8 | SNR 7209CG1DUJ84 (15°, duplex medium preload, same envelope) |
| Cross Reference 9 | MRC 7209DT (related, 29° contact angle, matched pair, same 45 x 85 x 19 mm envelope) |
Fafnir 2MM209WI-DUM super-precision angular contact ball bearings, supplied as a factory-matched duplex pair, Timken Fafnir 200WI spindle series. Bore Diameter: 45 mm. Outside Diameter: 85 mm. Overall Width: 19 mm per bearing — the 7209 envelope. Total Width: 38 mm mounted as the pair. Contact Angle: 15°. Preload: Medium. Precision Class: ABEC 7/9 / P4S. Dynamic Load Rating: 45,200 N per bearing. Static Load Rating: 28,800 N per bearing. Limiting Speed: 17,500 rpm grease; 35,000 rpm oil. Cage Material: Phenolic. Cage Type: Machined, outer-ring guided. Rolling Elements: Ball. Bore Type: Straight. Number Of Rows: 2. Closure Type: Open. Bearing Material: Chrome steel. Series: Fafnir 200WI. Base Number: 2MM209WI. Unit Quantity: 2 Pcs.
2MM — Contact Angle: 15°, in Fafnir’s MM super-precision range. Precision Class: ABEC 7/9 / P4S.
209 — 200 dimension series, bore code 09: a 45 mm bore in an 85 mm outside diameter, 19 mm wide.
WI — low shoulder on both rings, the Fafnir spindle angular contact execution.
CR — machined phenolic cage riding on the outer-ring lands.
DU — duplex, universally ground, so the pair can be built back-to-back, face-to-face or in tandem.
M — Preload: Medium.
A duplex pair with the faces ground to a defined offset takes up its own preload the moment the clamp nut is tightened, which is what removes internal play and fixes spindle stiffness at a known value. Medium preload is the middle of Fafnir’s ladder: stiffer and quieter under load than light, cooler running and faster than heavy.
A 15° contact angle keeps the load path close to the radial plane, favouring speed and radial stiffness. Limiting Speed: 17,500 rpm on grease, 35,000 rpm on oil. Dynamic Load Rating: 45,200 N and Static Load Rating: 28,800 N are the per-bearing figures; a duplex pair carries more than a single, and how much more depends on the mounting.
P4S is the super-precision grade, ABEC 7/9. Cage Material: Phenolic on the outer-ring lands — light, self-lubricating, and held concentric with the outer ring at speed.
Total Width: 38 mm. Maximum Shaft Fillet Radius: 1 mm. Shaft Backing Shoulder Diameter: 52.3 mm. Housing Backing Shoulder Diameter: 78.2 mm. Outer-ring to-clear radius: 1 mm.
Unit Quantity: 2 Pcs. A factory-matched duplex pair, ground and marked together. Timken world part number 7209C-T-P4S-DUM.
The Fafnir line is now Timken, so Timken 2MM209WICRDUM and Fafnir 2MM209WI-DUM are the same part, and Timken’s own world number for it is 7209C-T-P4S-DUM. Same 45 x 85 x 19 mm envelope, 15°, duplex medium preload: SKF 7209 CD/P4ADGB, FAG B7209-C-T-P4S-DUM, NSK 7209CTRDUMP4, NTN 7209UCDB/GNP4, RHP 7209CTDUMP4, Koyo 7209C-DUMP4, SNR 7209CG1DUJ84. The MRC 7209DT shares the envelope at a 29° contact angle and is listed as a related size.
2MM209WIDUM, 2MM209WI-DUM, 2MM209WICRDUM, 2MM-209-WI-DUM, 2 MM 209 WI CR DUM, 7209C-T-P4S-DUM, 7209C T DUM P4, 7209-C.
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