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
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90 mm bore x 160 mm OD x 30 mm wide angular contact ball bearing from Fafnir’s WI spindle series, open, with thrust-direction marking on the outer ring. Single bearing for spindles and shafts taking combined radial and one-directional thrust load.
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$136.88
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Here are some other options that might fit your project — cross-referenced equivalents and similar parts we have in stock and ready to ship. Need help choosing? Call 585-295-7880.
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Super-Precision Angular Contact Ball Bearing 90 x 160 x 30 mm, 15 Degree Contact Angle, ABEC 7, Light Preload, Phenolic Cage, Universally Ground Single$327.36
Super Precision Angular Contact Ball Bearing - Straight Bore, 90 mm ID, 160 mm OD, 30 mm Width, Open, 15° Contact Angle, Universal Medium Preload, P4S$373.37| MFR / Brand | Fafnir |
|---|---|
| Model | 7218 A/A5/ACD / 3 M 218 WI |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 90 mm |
| OD | 160 mm |
| Width | 30 mm |
| Material | Bearing Steel |
|---|---|
| Series | 200 |
| Base Number | 7218 (ISO); 218WI |
| Industry Terms | angular contact ball bearing; spindle bearing; machine tool bearing; Fafnir WI bearing; thrust bearing marked; 7218 bearing; 218WI bearing; precision angular contact |
| Common Misspellings | 3M218WI; 3MM218WI; 3M-218WI; 3M 218WI; 3M218W1; Fafner 3M218WI; Fafnier 3M218WI; Timkin 3M218WI |
| Application Types | Machine-tool spindles; precision gearboxes; pump and compressor shafts; vertical shaft assemblies; industrial drives carrying combined radial and one-directional thrust |
| Bore Shaft Size | 90 mm (3.5433 in) |
| Mpn Variants | 3M218WI; 3MM218WI; 3M-218-WI; 3M 218 WI; 218WI; 7218 |
| Manufacturer Status | Fafnir bearings supplied under The Timken Company; this unit is US-made new old stock |
| Compatible With Replaces | Fafnir 3M218WI / 3MM218WI; shares the 90x160x30 mm ISO 7218 envelope with 7218-series angular contact bearings from other makers - contact angle and preload class must be matched, and are not published for this reference |
| Rolling Elements | Ball |
| Number Of Rows | 1 (single) |
| Bore Type | Straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.10.50.68 |
| Part Number | 3M218WI |
A single angular contact ball bearing in the ISO 7218 envelope: 90 mm bore, 160 mm outside diameter, 30 mm width. Fafnir’s WI designation identifies its spindle angular contact family, built for machine-tool and precision rotating duty rather than general industrial service.
On the part number: the label and ring both read 3M218WI, so that is the correct marking, though the closely related metric super-precision line uses a double-M prefix and buyers frequently search 3MM218WI – both are listed here.
The outer ring on this example is stamped THRUST alongside the part number, which is the direction marking – angular contact bearings take thrust in one direction only, and that stamp tells the fitter which face must sit against the load. Get it the wrong way round and the bearing is loaded through its unsupported shoulder.
A single bearing therefore locates a shaft in one direction; where thrust reverses or extra rigidity is needed, two are mounted back-to-back, face-to-face or in tandem.
Typical duty is machine-tool spindles, precision gearboxes, pump and compressor shafts and vertical assemblies carrying combined radial and thrust load.
One bearing is supplied, sealed, with FAFNIR and MADE IN USA rolled into the ring.
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