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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:
2 in stock
Inch-series tapered roller cone, 48300 series, 5.3750 in bore, 1.6875 in width, Class 3 precision, stamped steel cage, high-alloy steel. Mating cup: 48320.
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| MFR / Brand | Timken |
|---|---|
| MPN | NA48390-3 |
| Model | NA48390-3 |
| Bearing Type | Tapered Roller Bearing Cone |
| ID | 5.3750 in |
| Series | 48300 |
|---|---|
| Base Number | 48390 |
| Industry Terms | taper roller cone, tapered bearing inner race, cone only, inner ring and roller assembly, TRB cone, precision class 3 cone |
| Common Misspellings | NA48390 3, NA4839O-3, NA-48930-3, 48390-3 Timkin, NA48390#3 |
| Application Types | Heavy shaft and axle assemblies, gearboxes, wheel ends, industrial machinery |
| Bore Shaft Size | 5.3750 in (5-3/8 in) |
| Mpn Variants | NA48390-3, NA48390 3, NA-48390-3, NA48390*3, NA48390, NA 48390, NA-48390, 48390, 48390-3, NA48390-2 |
| Manufacturer Status | Timken active manufacturer; new old stock item. Fafnir bearing lines are now part of Timken. |
| Compatible With Replaces | Mating cup 48320 |
| Number Of Rows | 1 |
| Harmonization Code | 8482.20.00 |
| Part Number | NA48390-3 |
| Cone Part Number | NA48390 |
| Cross Reference 1 | Timken 48390 - standard-class cone, looser tolerance than -3 |
|---|---|
| Cross Reference 2 | Timken NA48390-2 - Class 2 cone, one grade looser than Class 3 |
| Cross Reference 3 | Timken 48320 - mating cup, not included with this cone |
Timken NA48390-3 inch-series tapered roller bearing cone: the inner ring, its tapered roller complement and a stamped steel cage. Cone only. The matching cup is the Timken 48320. Bore: 5.3750 in. Cone Width: 1.6875 in. Series: 48300 inch tapered series. Number Of Rows: 1. Rolling Elements: Tapered rollers. Closure Type: Open. Cage Type: Stamped one-piece cage. Cage Material: Steel. Bearing Material: High-alloy bearing steel. Design Units: Inch.
Part Number: NA48390-3. NA is the Timken cone prefix within the inch tapered series. 48390 is the cone number in the 48300 series at a 5.3750 in bore. Precision Class: Timken Class 3, written -3 or *3 — a tighter tolerance than standard on bore, outside diameter, width and running accuracy.
Class 3 precision gives lower runout and a more repeatable mounted fit: closer shaft location, less running vibration and more even load distribution across the roller set. Maximum Shaft Fillet Radius: 0.14 in, which is the shaft shoulder fillet size that lets the cone back face seat flat on the shoulder. Dynamic Load Rating: approximately 63,600 lb for the complete 48390/48320 mounted assembly. Static Load Rating: approximately 122,000 lb for the complete 48390/48320 mounted assembly. Harmonization Code: 8482.20.00.
Unit Quantity: 1 Pc. Single-row separable tapered design. The cone runs against the 48320 cup and the pair is normally mounted opposed to a second tapered bearing, which sets radial and axial play on assembly.
Searchable forms of the designation: NA48390-3, NA48390 3, NA-48390-3, NA48390*3, NA48390, NA 48390, 48390, 48390-3. Closest first: Timken 48390 (standard-class cone of the same number), Timken NA48390-2 (Class 2 cone, one precision grade looser than Class 3), Timken 48320 (mating cup, not included) and Timken 48390/48320 (complete cone and cup assembly designation). Fafnir bearing numbers sit under Timken.
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