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Central Surplus Bearing Finder
A faster way to search our bearing inventory Today we’re launching the Central Surplus Bearing
Availability:
3 in stock
Double-row deep groove ball bearing, 55 mm bore x 120 mm OD x 43 mm wide, open, glass-fibre reinforced polyamide cage, takes thrust in both directions. Sold as 1 Pc.
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$172.70
3 in stock
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| MFR / Brand | SKF |
|---|---|
| Model | 4311 ATN9 |
| Bearing Type | Deep Groove Ball Bearing, Open |
| ID | 55 mm |
| OD | 120 mm |
| Width | 43 mm |
| Material | Bearing Steel |
|---|---|
| Series | 4300 |
| Base Number | 4311 |
| Industry Terms | double row deep groove ball bearing, double row ball bearing, 4300 series bearing, polyamide cage bearing, open ball bearing |
| Common Misspellings | SKF 4311ATN-9, 4311 A TN 9, SKF 4311 ATN90, SFK 4311ATN9, 4311ATNP |
| Application Types | Gearbox intermediate shafts, pulley and sheave mounts, electric motor drive ends, agricultural drives |
| Bore Shaft Size | 55 mm (2.1654 in) |
| Mpn Variants | 4311-ATN9, 4311ATN9, 4311 ATN9, 4311 A TN9, 4311A-TN9, 4311 |
| Manufacturer Status | SKF active production |
| Rolling Elements | Ball |
| Number Of Rows | 2 |
| Bore Type | straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.10.50 |
| Part Number | 4311-ATN9 |
| Cross Reference 1 | FAG 4311-B-TVH |
|---|---|
| Cross Reference 2 | NSK 4311B |
| Cross Reference 3 | NTN 4311 |
An SKF 4311 ATN9 double-row deep groove ball bearing with a 55 mm bore, a 120 mm outside diameter and a 43 mm width. It is open on both faces and has a glass-fibre reinforced polyamide cage.
43: SKF double-row deep groove ball bearing series. 11: bore code 11, 55 mm bore, 120 mm OD, 43 mm width. A: SKF design variant, rings without filling slots. TN9: glass-fibre reinforced polyamide (PA66) cage, working temperature to 120 °C. No closure suffix: open on both faces. No clearance suffix: normal internal clearance, CN.
Two rows of balls in one pair of rings roughly double the radial capacity of a single-row 6311 in the same bore and outside diameter, and the bearing still takes thrust in both directions like any deep groove design. That combination suits shafts that are radially loaded but have limited axial space for two separate bearings, such as gearbox intermediate shafts and pulley mounts. The polyamide cage runs quietly, has low mass so it tolerates acceleration well, and holds up under marginal lubrication; its 120 °C ceiling is what limits the bearing in hot service, where a pressed steel or brass cage version is specified instead. Open faces mean the bearing relies on the housing for sealing and can be lubricated from the housing supply.
Bore: 55 mm (2.1654 in). Outside diameter: 120 mm (4.7244 in). Width: 43 mm (1.6929 in). Number of rows: 2. Rolling elements: steel balls. Cage material: glass-fibre reinforced polyamide (PA66). Cage temperature ceiling: 120 °C. Internal clearance: CN, normal. Closure: open both faces. Axial load: carried in both directions.
One bearing, with no seals, shields or snap ring.
Supplied as 1 Pc.
Open double-row deep groove ball bearings in the same 55x120x43 mm envelope: FAG 4311-B-TVH, NSK 4311B and NTN 4311. A single-row 6311 shares the 55×120 envelope but is 29 mm wide with roughly half the radial capacity, so it is a related size only. Sealed or shielded versions of the same size restrict lubrication from the housing and change the effective width of the bearing faces.
Rockwell’s own product page for the Kinetix 6000 is down
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