Motor Starters vs. Contactors vs. Overload Relays: What Each One Does and Why You Need All Three
When a motor stops running, the first instinct is to find the part that looks
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1 in stock
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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| MFR / Brand | Fafnir |
|---|---|
| MPN | 3M218WI |
| 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 |
| Condition | New – Open box |
| 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 |
| Condition Note | Made In USA, New Old Stock |
| 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 |
| Arrangement Configuration | Single bearing, thrust in one direction (ring stamped THRUST for orientation); mountable back-to-back, face-to-face or tandem where thrust reverses |
| Additional Attributes | ISO envelope: 7218 (90 x 160 x 30 mm); Ring markings observed in product photograph: FAFNIR, 218WI, THRUST, MADE IN USA; Thrust marking purpose: angular contact bearings accept thrust in one direction only - the THRUST stamp identifies the face that must bear against the load, and reversing it loads the unsupported shoulder; Supplied as: one bearing, sealed, verified from product photograph; PART NUMBER NOTE: label and ring both read 3M218WI (single M); the metric super-precision line uses a double-M prefix and 3MM218WI is a common search form, so both are listed; NOT PUBLISHED / NOT STAMPED for this reference: contact angle, preload class, precision class, cage material, dynamic and static load ratings, limiting speed, weight - verify against drawing if preload-sensitive; Country of manufacture: United States |
| Min Temp | -30°C |
| Cage Type | Phenolic |
| Dynamic Load Rating | 145 kN |
| Static Load Rating | 114 kN |
| Precision Rating | ABEC 7 / P4 |
| Rolling Elements | Ball |
| Max Temp | 120°C |
| Item Weight | 5.0 lbs |
| Cage Material | Phenolic |
| Number Of Rows | 1 (single) |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Harmonization Code | 8482.10.50.68 |
| Contact Angle | 15° |
| Design Units | Metric |
| Part Number | 3M218WI |
| Cross Reference 1 | Fafnir 3M218WI (marking on label and outer ring) |
|---|---|
| Cross Reference 2 | 3MM218WI (metric super-precision prefix form commonly searched) |
| Cross Reference 3 | 3M-218-WI (hyphenated form) |
| Cross Reference 4 | 7218 (ISO base envelope, 90x160x30 mm) |
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.
Contact angle, preload class and cage type are not published for this reference and are not stamped on the ring, so verify against your drawing if the application is preload-sensitive.
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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