555S Bearing Dimensions
555S inch tapered roller bearing cone, paired with the 552 cup: 57.15 mm (2.250 in) bore, 123.825 mm OD, 38.1 mm width (FULI catalog). Quote.
555S specifications
| Cone bore d | 57.15 mm (2.250 in) |
|---|---|
| Cone width B | 36.678 mm |
| Matching cup | 552 |
| Cup outside diameter D | 123.825 mm (4.875 in) |
| Total width T | 38.1 mm (1.5 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 |
555S cone and cup pairs
| Cone | Cup | Bore d | OD D | Width T | Cr (kN) | C0r (kN) |
|---|---|---|---|---|---|---|
| 555S | 552 | 57.15 mm (2.250 in) | 123.825 mm (4.875 in) | 38.1 mm (1.5 in) | 163.8 | 223.3 |
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 555S designation
| Segment | Meaning |
|---|---|
| 555S | Designation breakdown not available for this model. |
555S interchange
555S 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.
555S compared with nearby cone sizes
The 555S cone has a 57.15 mm (2.250 in) bore and a cone width of 36.678 mm. FULI's catalog pairs it with cup 552 (123.825 mm outside diameter, 38.1 mm total width).
The next smaller cone on this site is 45291, with a 57.15 mm bore (0 mm smaller) and cup 45220.
The next larger is 390A, with a 63.5 mm bore (6.35 mm larger) and cup 394A.
The metric tapered bearing on this site closest in bore is 32011 (55 × 90 × 23 mm). Its sizes differ from the 555S pair, so the two are not interchangeable; it is given only as a size reference.
| Cone | Cup | d × D × T | Cr (kN) |
|---|---|---|---|
| 387A | 382A | 57.15 × 96.838 × 21 mm | 81.6 |
| 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 |
Sizes and Cr from FULI's catalog; — = not listed on this site.
555S load ratings
555S/552 has a dynamic load rating Cr of 163.8 kN and a static rating C0r of 223.3 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.
555S size in inches and millimetres
555S is made to inch sizes. The 57.15 mm bore is 2-1/4 in. The millimetre values in the catalog are conversions of the inch sizes.
| Dimension | Millimetres | Inches |
|---|---|---|
| Cone bore d | 57.15 mm | 2.2500 in |
| Cup outside diameter D (552) | 123.825 mm | 4.8750 in |
| Total width T | 38.1 mm | 1.5000 in |
| Cone width B | 36.678 mm | 1.4440 in |
| Cup width C | 33.338 mm | 1.3125 in |
Converted at 1 in = 25.4 mm and rounded to four decimals.
Mounting 555S (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 555S 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 555S
FULI supplies tapered roller bearings rust-protected and normally without grease; grease is packed in when the bearing is mounted. Relubricating 555S/552 from the side takes about 23.6 g each time by the formula in our grease calculator: 0.005 × D × T = 0.005 × 123.83 × 38.1.
How FULI supplies 555S
555S 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 (38.1 mm for 555S/552), 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 555S/552.
Tools and guides for 555S
Typical applications
- Vehicle wheel hubs and axles
- Gearboxes and reducers
- Agricultural machinery
- Conveyor pulleys
FAQ
What size is 555S in mm?
The 555S cone has a 57.15 mm bore (2.250 in). With cup 552 the bearing is 57.15 × 123.825 × 38.1 mm (d × D × T).
What is the difference between 555S and 390A?
390A has a 63.5 mm bore against 57.15 mm for 555S, and pairs with cup 394A (63.5 × 110 × 22 mm) instead of 552 (57.15 × 123.825 × 38.1 mm). The two are not interchangeable; order by the numbers on the old cone and cup.
How much grease does 555S/552 need?
About 23.6 g each time it is relubricated from the side (0.005 × 123.83 × 38.1). FULI ships it rust-protected without grease, so the first fill is made at mounting.
Which cup goes with the 555S cone?
FULI's catalog pairs the 555S cone with cup 552. Tell us whether you need the cone, the cup or both when you send the inquiry.
Is 555S the same size across brands?
555S 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.