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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
Double row angular contact ball bearing, 55 x 120 x 49.22 mm, 20° contact angle, open, chrome steel. Carries heavy combined radial and thrust loads.
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$93.05
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 5311W-BR |
| GTIN | 087796068049 |
| Model | 3311 / 5311WBR |
| Bearing Type | Angular Contact Ball Bearing |
| ID | 55 mm |
| OD | 120 mm |
| Width | 1-15/16 in |
| Base Number | 5311 |
|---|---|
| Overall Width | 49.22 mm |
| Mpn Variants | 5311W-BR; 5311-W-BR; 5311WBR; 5311W; 3311 |
| Precision Class | Not specified |
| Additional Attributes | Max Housing Fillet Radius: 2 mm; Shaft Backing Shoulder Diameter: 67.437 mm; Housing Backing Shoulder Diameter: 107.442 mm |
| Dynamic Load Rating | 144,000 N |
| Static Load Rating | 113,000 N |
| Series | 5300 |
| Rolling Elements | Ball |
| Item Weight | 2.72 kg (6.00 lb) |
| Number Of Rows | 2 |
| Bore Type | Straight |
| Internal Clearance | CN |
| Contact Angle | 20° |
| Bearing Material | Chrome Steel |
| Cross Reference 1 | SKF 3311 A (related, 30° contact angle) |
|---|---|
| Cross Reference 2 | FAG 3311-BD-XL (related, 30° contact angle) |
| Cross Reference 3 | NSK 3311 (related, 30° contact angle) |
| Cross Reference 4 | NTN 5311 (related, 30° contact angle) |
| Cross Reference 5 | Koyo 5311 (related, 30° contact angle) |
| Cross Reference 6 | MRC 5311 (related, 30° contact angle) |
| Cross Reference 7 | RHP 3311 (related, 30° contact angle) |
Fafnir 5311W-BR double-row angular contact ball bearing. Series: 5300. Base Number: 5311. Bore Diameter: 55 mm. Outside Diameter: 120 mm. Overall Width: 49.22 mm (1.938 in). Contact Angle: 20°. Number Of Rows: 2. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. Bearing Material: Chrome Steel. Internal Clearance: CN. Item Weight: 2.72 kg (6.00 lb).
5311 — Fafnir double-row angular contact series 5300 at a 55 mm bore. Timken publishes 3311 as the cross designation for the same envelope.
W — low outer-ring shoulder. Timken publishes a 20° contact angle for this size.
BR — carton suffix carried on this part, recorded as an MPN variant.
Dynamic Load Rating: 144,000 N. Static Load Rating: 113,000 N. Two ball rows inside one pair of rings take thrust in either direction, so one bearing locates a shaft axially and radially in a single seat.
Contact Angle: 20°. A 20° angle puts a larger share of a combined load through the radial path than the steeper 30° executions in the same envelope, and it runs cooler at speed.
Max Housing Fillet Radius: 2 mm. Shaft Backing Shoulder Diameter: 67.437 mm. Housing Backing Shoulder Diameter: 107.442 mm.
Unit Quantity: 1 Pc. One complete double-row bearing.
The 55 x 120 x 49 mm double-row angular contact envelope is an ISO standard, so 3311 and 5311 parts from other makers occupy the same shaft and housing seat. Those catalogue parts are built at 30°; this one runs 20°, and the cross-reference list marks that difference on every entry.
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