U399 Bearing Dimensions
U399 inch tapered roller bearing cone, paired with the U360L cup: 39.688 mm (1.563 in) bore, 73.025 mm OD, 19.395 mm width (FULI catalog). Quote.
U399 specifications
| Cone bore d | 39.688 mm (1.563 in) |
|---|---|
| Cone width B | 22.098 mm |
| Matching cup | U360L |
| Cup outside diameter D | 73.025 mm (2.875 in) |
| Total width T | 19.395 mm (0.764 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 |
U399 cone and cup pairs
| Cone | Cup | Bore d | OD D | Width T | Cr (kN) | C0r (kN) |
|---|---|---|---|---|---|---|
| U399 | U360L | 39.688 mm (1.563 in) | 73.025 mm (2.875 in) | 19.395 mm (0.764 in) | 55.1 | 64.8 |
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 U399 designation
| Segment | Meaning |
|---|---|
| U399 | Designation breakdown not available for this model. |
U399 interchange
U399 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.
U399 compared with nearby cone sizes
The U399 cone has a 39.688 mm (1.563 in) bore and a cone width of 22.098 mm. FULI's catalog pairs it with cup U360L (73.025 mm outside diameter, 19.395 mm total width).
The next smaller cone on this site is LM29749, with a 38.1 mm bore (1.59 mm smaller) and cup LM29711.
The next larger is 342A, with a 41.275 mm bore (1.59 mm larger) and cup 332.
The metric tapered bearing on this site closest in bore is 32008 (40 × 68 × 19 mm). Its sizes differ from the U399 pair, so the two are not interchangeable; it is given only as a size reference.
| Cone | Cup | d × D × T | Cr (kN) |
|---|---|---|---|
| 2788 | 2720 | 38.1 × 76.2 × 23.812 mm | 80.4 |
| LM29748 | LM29710 | 38.1 × 65.088 × 18.034 mm | 43.4 |
| LM29749 | LM29711 | 38.1 × 65.088 × 19.812 mm | 43.2 |
| U399 | U360L | 39.688 × 73.025 × 19.395 mm | 55.1 |
| 342A | 332 | 41.275 × 80 × 28.575 mm | 69.6 |
| 3877 | 3820 | 41.275 × 85.725 × 30.162 mm | 105.1 |
| LM501349 | LM501310 | 41.275 × 73.431 × 19.558 mm | 56.1 |
Sizes and Cr from FULI's catalog; — = not listed on this site.
U399 load ratings
U399/U360L has a dynamic load rating Cr of 55.1 kN and a static rating C0r of 64.8 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.
U399 size in inches and millimetres
U399 is made to inch sizes. The 39.688 mm bore is 1-9/16 in. The millimetre values in the catalog are conversions of the inch sizes.
| Dimension | Millimetres | Inches |
|---|---|---|
| Cone bore d | 39.688 mm | 1.5625 in |
| Cup outside diameter D (U360L) | 73.025 mm | 2.8750 in |
| Total width T | 19.395 mm | 0.7636 in |
| Cone width B | 22.098 mm | 0.8700 in |
| Cup width C | 15.265 mm | 0.6010 in |
Converted at 1 in = 25.4 mm and rounded to four decimals.
Mounting U399 (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 U399 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 U399
FULI supplies tapered roller bearings rust-protected and normally without grease; grease is packed in when the bearing is mounted. Relubricating U399/U360L from the side takes about 7.08 g each time by the formula in our grease calculator: 0.005 × D × T = 0.005 × 73.03 × 19.39.
How FULI supplies U399
U399 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 (19.395 mm for U399/U360L), 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 U399/U360L.
Tools and guides for U399
Typical applications
- Vehicle wheel hubs and axles
- Gearboxes and reducers
- Agricultural machinery
- Conveyor pulleys
FAQ
What size is U399 in mm?
The U399 cone has a 39.688 mm bore (1.563 in). With cup U360L the bearing is 39.688 × 73.025 × 19.395 mm (d × D × T).
What is the difference between U399 and 342A?
342A has a 41.275 mm bore against 39.688 mm for U399, and pairs with cup 332 (41.275 × 80 × 28.575 mm) instead of U360L (39.688 × 73.025 × 19.395 mm). The two are not interchangeable; order by the numbers on the old cone and cup.
How much grease does U399/U360L need?
About 7.08 g each time it is relubricated from the side (0.005 × 73.03 × 19.39). FULI ships it rust-protected without grease, so the first fill is made at mounting.
Which cup goes with the U399 cone?
FULI's catalog pairs the U399 cone with cup U360L. Tell us whether you need the cone, the cup or both when you send the inquiry.
Is U399 the same size across brands?
U399 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.