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Timing Belt Pulleys and V-Belt Sheaves: Matching Belt Drive Components Correctly
Belt drives may appear simple, consisting of two wheels and a belt for power transfer.
Availability:
27 in stock
Matched duplex spindle bearing pair, 50 x 90 x 20 mm, 15° contact angle, medium preload, phenolic outer-land-riding cage, open, ABEC 7/9 class.
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$234.27
27 in stock
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 2MM210WI CR DUM |
| Model | 2MM 210 WI DUM 7210 Q20210 |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 50 mm (1.9685 in) |
| OD | 90 mm (3.5433 in) |
| Width | 20 mm |
| Series | 2MM200WI (ISO 72 medium series) |
|---|---|
| Lubricant | Grease or oil |
| Preload | Medium (DUM) |
| Base Number | 7210 |
| Industry Terms | Machine tool spindle bearing; super precision angular contact; duplex matched pair; DUM set; medium preload spindle bearing |
| Common Misspellings | 2MM210WIDUM; 2MM210W1DUM; 2MM210WL-DUM; Fafner; Faffnir |
| Application Types | Machine tool spindles; grinding spindles; boring and milling heads; precision gearboxes |
| Total Width | 40 mm (1.5748 in) across the matched pair |
| Bore Shaft Size | 50 mm (1.9685 in) |
| Mpn Variants | 2MM210WIDUM; 2MM210WI DUM; 2MM210WI-DUM; 2MM210WICRDUM; 2MM210WI CR DUM; 2MM-210-WI-DUM; 2MM 210 WI DUM |
| Arrangement Configuration | Universal duplex pair (DUM), medium preload |
| Precision Class | ABEC 7/9 (ISO P4S) |
| Cage Type | Phenolic, outer-land-riding |
| Dynamic Load Rating | 47,400 N (10,700 lbf) per bearing |
| Static Load Rating | 31,700 N (7,130 lbf) per bearing |
| Precision Rating | ABEC 7/9 (ISO P4S) |
| Rolling Elements | Steel balls |
| Limiting Speed | 16,000 rpm grease / 32,000 rpm oil |
| Number Of Rows | 1 per bearing |
| Bore Type | Straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.10.50.28 |
| Contact Angle | 15° |
| Part Number | 2MM210WI CR DUM |
| Dynamic Load Rating C1 | 47,400 N (10,700 lbf) per bearing |
| Cross Reference 1 | SKF 7210 CD/P4ADGB |
|---|---|
| Cross Reference 2 | FAG B7210-C-T-P4S-DUM |
| Cross Reference 3 | NSK 7210CTYNDUMP4 |
| Cross Reference 4 | Timken 2MM210WI DUL - light preload |
| Cross Reference 5 | NSK 7210A5TYNDUMP4 - 25 deg vs 15 deg |
| Cross Reference 6 | SKF 7210 ACD/P4ADGB - 25 deg vs 15 deg |
| Cross Reference 7 | FAG B7210-E-T-P4S-DUM - 25 deg vs 15 deg |
Fafnir 2MM210WI CR DUM super-precision angular contact ball bearings, supplied as a matched duplex pair for machine tool spindles. Open, one row of balls per bearing, 15° contact angle, medium preload, phenolic outer-land-riding cage. Unit Quantity: 2 Pcs (one matched duplex pair).
2MM — 15° contact angle; MM = P4S super-precision class, ABEC 7/9.
210 — ISO 7210 base number, 72 medium dimension series.
WI — super-precision angular contact spindle configuration.
CR — phenolic outer-land-riding cage.
DU — duplex, universally ground.
M — medium preload.
Bore Diameter: 50 mm (1.9685 in). Outside Diameter: 90 mm (3.5433 in). Overall Width: 20 mm (0.7874 in) per bearing. Total Width: 40 mm (1.5748 in) across the pair. Contact Angle: 15°. Preload: Medium (DUM). Precision Class: ABEC 7/9 (ISO P4S). Cage Type: Phenolic, outer-land-riding. Closure Type: Open. Rolling Elements: Steel balls. Bore Type: Straight. Dynamic Load Rating (C1): 47,400 N (10,700 lbf) per bearing. Static Load Rating (C0): 31,700 N (7,130 lbf) per bearing. Limiting Speed: 16,000 rpm grease; 32,000 rpm oil. Lubricant: Grease or oil.
Universal grinding allows back-to-back, face-to-face or tandem mounting. The outer rings carry V marks that identify the intended arrangement. The pair is preloaded, so no internal clearance class applies.
Same-specification 15° medium-preload pairs: SKF 7210 CD/P4ADGB; FAG B7210-C-T-P4S-DUM; NSK 7210CTYNDUMP4. Related sizes: Timken 2MM210WI DUL (light preload); NSK 7210A5TYNDUMP4, SKF 7210 ACD/P4ADGB and FAG B7210-E-T-P4S-DUM (25° vs 15°). Ratings sourced from Timken (cad.timken.com, item 2MM210WI).
15°; the 2MM prefix denotes a 15° contact angle.
DU is a universally ground duplex pair and M is medium preload.
Dynamic 47,400 N and static 31,700 N per bearing.
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