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Super-precision angular contact ball bearing pair, 90 x 160 x 30 mm, 15° contact angle, P4S class, phenolic outer-land-riding cage, duplex light preload.
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 2MM218WI-CR-DUL |
| Model | 7218 C T DUL P4 / 2 MM 218 WI CR DUL / 7218C / 218HDL |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 90 mm |
| OD | 160 mm |
| Width | 30 mm |
| Material | Bearing Steel |
|---|---|
| Series | 7200 |
| Condition | New |
| Lubricant | Oil Preservative |
| Preload | Light |
| Running Accuracy | P4 |
| Base Number | 2MM218WI |
| Industry Terms | spindle bearing, super precision angular contact, precision duplex pair, matched set bearing, ABEC 7 bearing, phenolic cage bearing, high speed spindle bearing |
| Common Misspellings | Fafner, Faffnir, Fafnier, 2MM281WI, 2MM218WL, 2MM218W1 |
| Application Types | High-speed machine tool spindles, grinding spindles, precision turning spindles, high-rpm rotary equipment |
| Total Width | 60 mm (2.362 in) for the duplex pair |
| Bore Shaft Size | 90 mm (3.543 in) |
| Mpn Variants | 2MM218WI-CR-DUL, 2MM218WICRDUL, 2MM218WIDUL, 2MM-218-WI-DUL, 2MM 218 WI CR DUL, 2MM218WI, 218WI, MM218WI |
| Manufacturer Status | Fafnir super precision line now supplied under the Timken brand |
| Compatible With Replaces | High-speed machine tool and grinding spindle positions calling for a 90x160x30 mm 15 deg super precision duplex pair with light preload |
| Arrangement Configuration | Duplex universally ground matched pair — mountable DB, DF or DT |
| Precision Class | P4S (ABEC 7/9) |
| Dynamic Load Rating C1 | 129.9 kN / 29,200 lbf (duplex set) |
| Additional Attributes | Outer ring "to clear" radius 2.0 mm (0.079 in); Timken World Part Number 7218C-T-P4S-DUL; Ball type steel; 15° with light preload and a phenolic cage is the highest-speed configuration in this family |
| Min Temp | -30 °C |
| Cage Type | CR - Phenolic Outer Land Riding Cage |
| Dynamic Load Rating | 129.9 kN / 29,200 lbf (C1, duplex set) · 118 kN / 26,500 lbf (C1, per row) |
| Static Load Rating | 97.9 kN / 22,000 lbf (C0) |
| Precision Rating | P4S / ABEC 7-9 |
| Rolling Elements | Balls |
| Max Temp | 120 °C |
| Item Weight | 5.30 lbs |
| Cage Material | Phenolic (cotton-reinforced laminate) |
| Limiting Speed | 8,900 rpm grease / 17,800 rpm oil |
| Number Of Rows | 1 per bearing, 2 rows as a mounted pair |
| Bore Type | Straight |
| Snap Ring Included | Not specified |
| Relubrication Feature | Yes |
| Harmonization Code | 8482.10.50.28 |
| Contact Angle | 15° |
| Mounting Arrangement | Universal |
| Design Units | Metric |
| Bearing Material | Through-hardened bearing steel |
| Part Number | 2MM218WI-CR-DUL |
| Cross Reference 1 | 7218C (ISO base number with 15 deg contact angle, 90x160x30 mm) |
|---|---|
| Cross Reference 2 | 7218 (ISO base number, 90x160x30 mm envelope) |
| Cross Reference 3 | NSK 7218C super precision (C = 15 deg, dimensional and angle equivalent) |
| Cross Reference 4 | FAG B7218-C-T-P4S (C = 15 deg in FAG nomenclature) |
| Cross Reference 5 | SKF 7218 CD/P4A (CD = 15° in SKF nomenclature) |
| Cross Reference 6 | NTN 7218C super precision, dimensional and angle equivalent |
| Cross Reference 7 | Timken 2MM218WI (Fafnir super precision now branded Timken) |
| Cross Reference 8 | 3MM218WI (25 deg sibling, same envelope, different contact angle) |
| Cross Reference 9 | 218HDL, 7218CTDULP4 |
Fafnir 2MM218WI-CR-DUL super-precision angular contact ball bearing, supplied as a universally ground duplex pair. Bore: 90 mm. Outside Diameter: 160 mm. Bearing Width: 30 mm. Total Width: 60 mm. Series: Fafnir 200WI spindle series, ISO 7218 envelope. Timken World Part Number: 7218C-T-P4S-DUL. Rolling Elements: steel balls. Cage Type: CR – Phenolic Outer Land Riding Cage. Cage Material: phenolic, cotton-reinforced laminate. Closure Type: open on both faces.
2MM is the Fafnir super-precision prefix. Contact Angle: 15°. Precision Rating: ISO P4S (ABEC 7/9). 218 sets the 7218 boundary dimensions, 90 x 160 x 30 mm. WI identifies the super-precision angular contact spindle family. CR is the phenolic cage riding on the outer ring land. DUL is duplex, universally ground, light preload. Preload: Light. Searchable forms of the number include 2MM218WI-CR-DUL, 2MM218WICRDUL, 2MM218WIDUL and 2MM 218 WI CR DUL.
Dynamic Radial Load Rating (C1, set): 129.9 kN / 29,200 lbf. Dynamic Radial Load Rating (C1, per row): 118 kN / 26,500 lbf. Static Radial Load Rating (C0): 97.9 kN / 22,000 lbf. Limiting Speed, grease: 8,900 rpm. Limiting Speed, oil: 17,800 rpm. A 15° contact angle is the high-speed choice: the shallower the angle, the less the ball climbs the raceway shoulder, so ball spin and heat generation drop and permissible rpm rises. The trade is thrust, since a 15° bearing carries less axial load and is less stiff axially than the 25° version of the same envelope. Light preload keeps internal friction and heat generation down, and phenolic, at roughly a fifth the density of bronze, keeps centrifugal cage stress low while holding a small reserve of oil in the cage material. 15°, light preload and a phenolic cage together make the fastest-running configuration in this family.
Shaft Backing Shoulder Diameter: 102.7 mm (4.05 in). Housing Backing Shoulder Diameter: 148 mm (5.830 in). Maximum Shaft Fillet Radius: 2 mm (0.079 in). Outer Ring To Clear Radius: 2 mm (0.079 in).
Two bearings, one duplex pair. Unit Quantity: 2 Pcs. Universal grinding lets the pair mount back to back for maximum moment stiffness and two-direction thrust, face to face where the housing bores may be slightly out of line, or in tandem to double thrust capacity in one direction. The light preload develops when the pair is clamped between the shaft shoulder and the locknut.
Fafnir super precision is supplied under the Timken brand and the Fafnir numbers stay in active cross-reference use. Same-envelope 15° equivalents include NSK 7218C, FAG B7218-C-T-P4S, SKF 7218 CD/P4A and NTN 7218C in the corresponding precision grade; in each of those schemes C denotes 15°. The 25° Fafnir sibling in the same envelope is 3MM218WI, a related size rather than a substitution. The Fafnir legacy reference 218HDL also appears against this envelope.
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