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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
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1 in stock
Single-row deep groove ball bearing, 90 x 160 x 30 mm, open both faces, pressed steel cage, normal clearance. 1 Pc.
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$91.47
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 218W |
| GTIN | 087796066939 |
| Model | 218-W |
| Bearing Type | Ball Bearing, Open |
| ID | 90 mm |
| OD | 160 mm |
| Width | 30 mm |
| Material | Bearing Steel |
|---|---|
| Base Number | 6218 |
| Industry Terms | Deep groove ball bearing; radial ball bearing; open ball bearing; Conrad bearing |
| Common Misspellings | Fafner; Faffnir; Fanfir; 218-VV; 218VV |
| Application Types | Electric motors; gearboxes; pumps; fans; general line shafting |
| Bore Shaft Size | 90 mm (3.5433 in) |
| Mpn Variants | 218W; 218-W; 218 W; F218W |
| Manufacturer Status | Fafnir is a Timken ball bearing brand |
| Rolling Elements | Balls |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | No |
| Part Number | 218W |
A Fafnir 218W single-row deep groove ball bearing, 90 mm bore by 160 mm outside diameter by 30 mm wide, open on both faces with a pressed steel cage. Fafnir is Timken’s precision ball bearing line and the 200W block is its inch-era designation for the metric ISO 62 deep groove series. The ISO equivalent is the 6218 size.
The 218 size code gives a 90 mm bore in the ISO 62 dimension series, and the W suffix marks the open Fafnir deep groove ball bearing with no closure fitted. There is no clearance suffix in the designation, so the bearing carries normal internal clearance. There is no cage letter either, which in this family means the standard pressed steel ribbon cage.
Dynamic load rating 108 kN and static load rating 93 kN. Those figures are for this single bearing on its own, not for a paired or stacked arrangement.
A deep groove ball bearing of this size takes radial load with a useful amount of thrust in either direction, which is what makes it the default choice for general shafting, electric motors and gearbox positions. Open faces mean the bearing is lubricated and sealed by the housing rather than by itself, so it suits circulating oil or a grease-packed cavity and it can be flushed and relubricated in service. Normal clearance is correct where shaft and housing fits are conventional and the temperature difference across the bearing is modest.
1 Pc. Open bearing with no seals, shields, snap ring or locating ring.
The bearing is pressed on by the ring that takes the tight fit, with the force applied square to the ring face and never passed through the balls. Both rings seat fully against their shoulders, and the housing cavity is filled to the customary proportion for a grease-lubricated open bearing.
An SKF 6218, FAG 6218, NSK 6218 or NTN 6218 in the open form with normal clearance and a pressed steel cage is the same specification. A 6218 2RS or 6218 ZZ is a different part, since the closure changes both the speed rating and the lubrication scheme. A 6218 in C3 clearance is likewise a different part.
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