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Deep Groove Ball Bearings: The Industry Default and When to Reach for Something Else
If you pulled a bearing off general industrial equipment at random, there’s a good chance
Availability:
1 in stock
Super precision angular contact ball bearing, 90 x 160 x 30 mm, 15° contact angle, medium preload, phenolic outer-land-riding cage, P4S tolerance.
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$373.37
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 2MM218WI CR SUM |
| Model | 7218C-T-P4S-SUM |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 90 mm |
| OD | 160 mm |
| Width | 30 mm |
| Material | Bearing Steel |
|---|---|
| Series | 200WI (ISO 72) |
| Lubricant | Oil/Grease |
| Base Number | 7218 |
| Industry Terms | Spindle bearing, machine tool bearing, super precision angular contact, ABEC 7/9, universally ground |
| Bore Shaft Size | 90 mm |
| Mpn Variants | 2MM218WICR-SUM, 2MM218WICRSUM, 2MM 218 WI CR SUM, 2MM218WICRDUM, 2MM-218-WI-CR-DUM, 7218C-T-P4S-SUM, 7218-C, 218HDM |
| Rolling Elements | Steel balls |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Harmonization Code | 8482.10.50 |
| Contact Angle | 15° |
| Part Number | 2MM218WICR-SUM |
| Cross Reference 1 | FAG B7218-C-T-P4S-UM |
|---|
Fafnir 2MM218WICR-SUM super precision angular contact ball bearing from Timken. Series: 200WI. ISO equivalent: 7218. Bore: 90 mm. Outside Diameter: 160 mm. Width: 30 mm. Timken world part number: 7218C-T-P4S-SUM.
Contact Angle: 15°. Precision Rating: ISO P4S, ABEC 7/9. Preload: medium. Rows per set: single. Cage: CR, machined phenolic, outer-ring-land-riding. Ball material: steel. Closure: open. Searchable forms include 2MM218WICR-SUM, 2MM218WICRSUM, 2MM 218 WI CR SUM, 7218C-T-P4S-SUM, 7218-C and 218HDM.
A 15° contact angle favours speed and radial rigidity over pure thrust capacity, the standard choice for machine tool spindles. Medium preload sits between light and heavy: more axial stiffness than light, less heat than heavy. Universal grinding lets any two or three of these bearings be stacked back-to-back, face-to-face or in tandem and reach the published preload without shims. The phenolic outer-land-riding cage is light, runs cool and suits oil-mist and air-oil lubrication.
Dynamic Radial Load Rating, 1M revolutions C1: 129 900 N. Dynamic Radial Load Rating per row, ISO C1: 118 000 N. Static Radial Load Rating: 97 900 N. Limiting Speed, grease: 8 900 rpm. Limiting Speed, oil: 17 800 rpm.
One bearing. Single row of balls. Universally ground for stacking into duplex or triplex sets.
Maximum shaft fillet radius: 2 mm. Shaft backing shoulder diameter: 102.7 mm. Housing backing shoulder diameter: 148 mm. Outer ring to-clear radius: 2 mm. Bore form is straight. Lubrication: oil or grease.
Same-specification equivalent: FAG B7218-C-T-P4S-UM. Related sizes on the same envelope: SKF 7218 CD/P4A executions and Barden 218HDM. A 7218 in a different contact angle, preload grade or set code is a related size, not an interchange.
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