390A Bearing Dimensions
390A inch tapered roller bearing cone, paired with the 394A cup: 63.5 mm (2.500 in) bore, 110 mm OD, 22 mm width (FULI catalog). Quote.
390A specifications
| Cone bore d | 63.5 mm (2.500 in) |
|---|---|
| Cone width B | 21.996 mm |
| Matching cup | 394A |
| Cup outside diameter D | 110 mm (4.331 in) |
| Total width T | 22 mm (0.866 in) — assembled width of cup and cone |
| Seal / shield options | Open (cup and cone, no seals) |
| Material | GCr15 chrome bearing steel (rings and rolling elements) |
| Radial clearance | Set during mounting (adjustable, not a C-class value) |
| Load ratings | See the cone and cup pairs table below |
390A cone and cup pairs
| Cone | Cup | Bore d | OD D | Width T | Cr (kN) | C0r (kN) |
|---|---|---|---|---|---|---|
| 390A | 394A | 63.5 mm (2.500 in) | 110 mm (4.331 in) | 22 mm (0.866 in) | 88.6 | 118.5 |
Dimensions from FULI's catalog. A cone (inner ring with rollers and cage) and a cup (outer ring) make up one bearing; the pairs above are the matching numbers listed in FULI's catalog. Values from FULI's catalog; confirm for your application.
How to read the 390A designation
| Segment | Meaning |
|---|---|
| 390A | Designation breakdown not available for this model. |
390A interchange
390A is an inch tapered roller bearing cone. Inch tapered roller bearings are ordered by cone number and cup number. Most makers use the same cone and cup numbers for the same size, but always check the cup number as well. Send us the numbers on your old bearing and we confirm the match before quoting.
Brand names are trademarks of their respective owners. FULI is not affiliated with, authorized by or endorsed by these companies. Part numbers are shown for interchange reference only. FULI dimensions, load ratings and speeds come from the FULI catalog.
390A compared with nearby cone sizes
The 390A cone has a 63.5 mm (2.500 in) bore and a cone width of 21.996 mm. FULI's catalog pairs it with cup 394A (110 mm outside diameter, 22 mm total width).
The next smaller cone on this site is 555S, with a 57.15 mm bore (6.35 mm smaller) and cup 552.
The next larger is 39585, with a 63.5 mm bore (0 mm larger) and cup 39520.
Cup 394A is also listed with 395S and 395A, so the same housing bore can take a different cone if the shaft size changes.
The metric tapered bearing on this site closest in bore is 33013 (65 × 100 × 27 mm). Its sizes differ from the 390A pair, so the two are not interchangeable; it is given only as a size reference.
| Cone | Cup | d × D × T | Cr (kN) |
|---|---|---|---|
| 387S | 382A | 57.15 × 96.838 × 21 mm | 81.6 |
| 45291 | 45220 | 57.15 × 104.775 × 30.162 mm | 132.9 |
| 555S | 552 | 57.15 × 123.825 × 38.1 mm | 163.8 |
| 390A | 394A | 63.5 × 110 × 22 mm | 88.6 |
| 39585 | 39520 | 63.5 × 112.712 × 30.162 mm | 144.9 |
| JM511945 | 3920 | 65 × 112.712 × 29.02 mm | 120.3 |
| 39590 | 39520 | 66.675 × 112.712 × 30.162 mm | 144.9 |
Sizes and Cr from FULI's catalog; — = not listed on this site.
390A load ratings
390A/394A has a dynamic load rating Cr of 88.6 kN and a static rating C0r of 118.5 kN in FULI's catalog. The ratings belong to the cone and cup as a pair; a different cup changes them.
Speed limits and weights for inch cones are not listed in the catalog; ask us and we send them with the quotation.
Values from FULI's catalog; confirm for your application.
390A size in inches and millimetres
390A is made to inch sizes. The 63.5 mm bore is 2-1/2 in. The millimetre values in the catalog are conversions of the inch sizes.
| Dimension | Millimetres | Inches |
|---|---|---|
| Cone bore d | 63.5 mm | 2.5000 in |
| Cup outside diameter D (394A) | 110 mm | 4.3307 in |
| Total width T | 22 mm | 0.8661 in |
| Cone width B | 21.996 mm | 0.8660 in |
| Cup width C | 18.824 mm | 0.7411 in |
Converted at 1 in = 25.4 mm and rounded to four decimals.
Mounting 390A (general guidance)
General guidance, not a FULI specification: on a turning shaft the cone is a tight fit on the shaft and the cup a lighter fit in the housing, so the cup can be moved when the bearing pair is adjusted. Inch bearing fits are given as shaft and housing limits in inches in the bearing makers' tables; follow the drawing of your machine.
Tapered roller bearings carry radial load and axial load in one direction, so 390A is normally used as one of a pair, and the end play or preload is set at mounting.
If the outer ring turns and the shaft stands still, as in an idler pulley or a wheel hub, the fits are reversed: the housing gets the interference fit (for example N7 or P7) and the shaft a sliding one (g6 or h6).
Grease for 390A
FULI supplies tapered roller bearings rust-protected and normally without grease; grease is packed in when the bearing is mounted. Relubricating 390A/394A from the side takes about 12.1 g each time by the formula in our grease calculator: 0.005 × D × T = 0.005 × 110 × 22.
How FULI supplies 390A
390A is supplied as a cone, as a cup or as a complete cone and cup pair, as your order states. Where an order states a requirement for the total width T (22 mm for 390A/394A), each set is checked on a height gauge before packing.
Rings are marked with a brand you are authorised to use, with the FULI brand, or left neutral, as your order states. The box is printed with the model, precision class and brand.
Inquiries that give only one number are the usual cause of a wrong quote, so write both the cone and the cup number, for example 390A/394A.
Tools and guides for 390A
Typical applications
- Vehicle wheel hubs and axles
- Gearboxes and reducers
- Agricultural machinery
- Conveyor pulleys
FAQ
What size is 390A in mm?
The 390A cone has a 63.5 mm bore (2.500 in). With cup 394A the bearing is 63.5 × 110 × 22 mm (d × D × T).
What is the difference between 390A and 39585?
39585 has a 63.5 mm bore against 63.5 mm for 390A, and pairs with cup 39520 (63.5 × 112.712 × 30.162 mm) instead of 394A (63.5 × 110 × 22 mm). The two are not interchangeable; order by the numbers on the old cone and cup.
How much grease does 390A/394A need?
About 12.1 g each time it is relubricated from the side (0.005 × 110 × 22). FULI ships it rust-protected without grease, so the first fill is made at mounting.
Which cup goes with the 390A cone?
FULI's catalog pairs the 390A cone with cup 394A. Tell us whether you need the cone, the cup or both when you send the inquiry.
Is 390A the same size across brands?
390A is an inch tapered roller bearing cone number. Most makers use the same cone and cup numbers for the same size, but check the cup number too. Send us the numbers on your old bearing and we confirm the match.