387S Bearing Dimensions
387S inch tapered roller bearing cone, paired with the 382A cup: 57.15 mm (2.250 in) bore, 96.838 mm OD, 21 mm width (FULI catalog). Quote.
387S specifications
| Cone bore d | 57.15 mm (2.250 in) |
|---|---|
| Cone width B | 21.946 mm |
| Matching cup | 382A |
| Cup outside diameter D | 96.838 mm (3.813 in) |
| Total width T | 21 mm (0.827 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 |
387S cone and cup pairs
| Cone | Cup | Bore d | OD D | Width T | Cr (kN) | C0r (kN) |
|---|---|---|---|---|---|---|
| 387S | 382A | 57.15 mm (2.250 in) | 96.838 mm (3.813 in) | 21 mm (0.827 in) | 81.6 | 102.1 |
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 387S designation
| Segment | Meaning |
|---|---|
| 387S | Designation breakdown not available for this model. |
387S interchange
387S 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.
387S compared with nearby cone sizes
The 387S cone has a 57.15 mm (2.250 in) bore and a cone width of 21.946 mm. FULI's catalog pairs it with cup 382A (96.838 mm outside diameter, 21 mm total width).
The next smaller cone on this site is 387A, with a 57.15 mm bore (0 mm smaller) and cup 382A.
The next larger is 45291, with a 57.15 mm bore (0 mm larger) and cup 45220.
Cup 382A is also listed with 387A, 385 and 385A, 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 32011 (55 × 90 × 23 mm). Its sizes differ from the 387S pair, so the two are not interchangeable; it is given only as a size reference.
| Cone | Cup | d × D × T | Cr (kN) |
|---|---|---|---|
| 385 | 382A | 55 × 96.838 × 21 mm | 81.6 |
| 28682 | 28622 | 57.15 × 97.63 × 24.608 mm | 90.5 |
| 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 |
Sizes and Cr from FULI's catalog; — = not listed on this site.
387S load ratings
387S/382A has a dynamic load rating Cr of 81.6 kN and a static rating C0r of 102.1 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.
387S size in inches and millimetres
387S 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 (382A) | 96.838 mm | 3.8125 in |
| Total width T | 21 mm | 0.8268 in |
| Cone width B | 21.946 mm | 0.8640 in |
| Cup width C | 15.875 mm | 0.6250 in |
Converted at 1 in = 25.4 mm and rounded to four decimals.
Mounting 387S (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 387S 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 387S
FULI supplies tapered roller bearings rust-protected and normally without grease; grease is packed in when the bearing is mounted. Relubricating 387S/382A from the side takes about 10.2 g each time by the formula in our grease calculator: 0.005 × D × T = 0.005 × 96.84 × 21.
How FULI supplies 387S
387S 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 (21 mm for 387S/382A), 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 387S/382A.
Tools and guides for 387S
Typical applications
- Vehicle wheel hubs and axles
- Gearboxes and reducers
- Agricultural machinery
- Conveyor pulleys
FAQ
What size is 387S in mm?
The 387S cone has a 57.15 mm bore (2.250 in). With cup 382A the bearing is 57.15 × 96.838 × 21 mm (d × D × T).
What is the difference between 387S and 45291?
45291 has a 57.15 mm bore against 57.15 mm for 387S, and pairs with cup 45220 (57.15 × 104.775 × 30.162 mm) instead of 382A (57.15 × 96.838 × 21 mm). The two are not interchangeable; order by the numbers on the old cone and cup.
How much grease does 387S/382A need?
About 10.2 g each time it is relubricated from the side (0.005 × 96.84 × 21). FULI ships it rust-protected without grease, so the first fill is made at mounting.
Which cup goes with the 387S cone?
FULI's catalog pairs the 387S cone with cup 382A. Tell us whether you need the cone, the cup or both when you send the inquiry.
Is 387S the same size across brands?
387S 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.