28580 Bearing Dimensions
28580 inch tapered roller bearing cone, paired with the 28521 cup: 50.8 mm (2.000 in) bore, 92.075 mm OD, 24.6 mm width (FULI catalog). Quote.
28580 specifications
| Cone bore d | 50.8 mm (2.000 in) |
|---|---|
| Cone width B | 25.4 mm |
| Matching cup | 28521 |
| Cup outside diameter D | 92.075 mm (3.625 in) |
| Total width T | 24.6 mm (0.969 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 |
28580 cone and cup pairs
| Cone | Cup | Bore d | OD D | Width T | Cr (kN) | C0r (kN) |
|---|---|---|---|---|---|---|
| 28580 | 28521 | 50.8 mm (2.000 in) | 92.075 mm (3.625 in) | 24.6 mm (0.969 in) | 86.3 | 120.1 |
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 28580 designation
| Segment | Meaning |
|---|---|
| 2 | Spherical roller bearing (double row, self-aligning) |
| 85 | Dimension series 85 |
| 80 | Bore code 80 → 50.8 mm bore. ISO bore code (00–03 = 10/12/15/17 mm; 04 and above = code × 5 mm). |
28580 interchange
28580 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.
28580 compared with nearby cone sizes
The 28580 cone has a 50.8 mm (2.000 in) bore and a cone width of 25.4 mm. FULI's catalog pairs it with cup 28521 (92.075 mm outside diameter, 24.6 mm total width).
The next smaller cone on this site is 25590, with a 45.618 mm bore (5.18 mm smaller) and cup 25522.
The next larger is 368, with a 50.8 mm bore (0 mm larger) and cup 362A.
The metric tapered bearing on this site closest in bore is 32010 (50 × 80 × 20 mm). Its sizes differ from the 28580 pair, so the two are not interchangeable; it is given only as a size reference.
| Cone | Cup | d × D × T | Cr (kN) |
|---|---|---|---|
| LM603049 | LM603012 | 45.242 × 77.788 × 21.43 mm | 57.4 |
| 25581 | 25520 | 45.618 × 82.931 × 23.812 mm | 77.9 |
| 25590 | 25522 | 45.618 × 83.058 × 23.876 mm | 78.3 |
| 28580 | 28521 | 50.8 × 92.075 × 24.6 mm | 86.3 |
| 368 | 362A | 50.8 × 88.9 × 20.638 mm | 75.8 |
| 368A | 362A | 50.8 × 88.9 × 20.638 mm | 75.8 |
| 3780 | 3720 | 50.8 × 93.264 × 30.162 mm | 113 |
Sizes and Cr from FULI's catalog; — = not listed on this site.
28580 load ratings
28580/28521 has a dynamic load rating Cr of 86.3 kN and a static rating C0r of 120.1 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.
28580 size in inches and millimetres
28580 is made to inch sizes. The 50.8 mm bore is 2 in. The millimetre values in the catalog are conversions of the inch sizes.
| Dimension | Millimetres | Inches |
|---|---|---|
| Cone bore d | 50.8 mm | 2.0000 in |
| Cup outside diameter D (28521) | 92.075 mm | 3.6250 in |
| Total width T | 24.6 mm | 0.9685 in |
| Cone width B | 25.4 mm | 1.0000 in |
| Cup width C | 19.845 mm | 0.7813 in |
Converted at 1 in = 25.4 mm and rounded to four decimals.
Mounting 28580 (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 28580 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 28580
FULI supplies tapered roller bearings rust-protected and normally without grease; grease is packed in when the bearing is mounted. Relubricating 28580/28521 from the side takes about 11.3 g each time by the formula in our grease calculator: 0.005 × D × T = 0.005 × 92.08 × 24.6.
How FULI supplies 28580
28580 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 (24.6 mm for 28580/28521), 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 28580/28521.
Tools and guides for 28580
Typical applications
- Vehicle wheel hubs and axles
- Gearboxes and reducers
- Agricultural machinery
- Conveyor pulleys
FAQ
What size is 28580 in mm?
The 28580 cone has a 50.8 mm bore (2.000 in). With cup 28521 the bearing is 50.8 × 92.075 × 24.6 mm (d × D × T).
What is the difference between 28580 and 368?
368 has a 50.8 mm bore against 50.8 mm for 28580, and pairs with cup 362A (50.8 × 88.9 × 20.638 mm) instead of 28521 (50.8 × 92.075 × 24.6 mm). The two are not interchangeable; order by the numbers on the old cone and cup.
How much grease does 28580/28521 need?
About 11.3 g each time it is relubricated from the side (0.005 × 92.08 × 24.6). FULI ships it rust-protected without grease, so the first fill is made at mounting.
Which cup goes with the 28580 cone?
FULI's catalog pairs the 28580 cone with cup 28521. Tell us whether you need the cone, the cup or both when you send the inquiry.
Is 28580 the same size across brands?
28580 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.