15123 Bearing Dimensions
15123 inch tapered roller bearing cone, paired with the 15245 cup: 31.75 mm (1.250 in) bore, 62 mm OD, 19.05 mm width (FULI catalog). Quote.
15123 specifications
| Cone bore d | 31.75 mm (1.250 in) |
|---|---|
| Cone width B | 19.05 mm |
| Matching cup | 15245 |
| Cup outside diameter D | 62 mm (2.441 in) |
| Total width T | 19.05 mm (0.75 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 |
15123 cone and cup pairs
| Cone | Cup | Bore d | OD D | Width T | Cr (kN) | C0r (kN) |
|---|---|---|---|---|---|---|
| 15123 | 15245 | 31.75 mm (1.250 in) | 62 mm (2.441 in) | 19.05 mm (0.75 in) | 44.6 | 50.7 |
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 15123 designation
| Segment | Meaning |
|---|---|
| 15123 | Designation breakdown not available for this model. |
15123 interchange
15123 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.
15123 compared with nearby cone sizes
The 15123 cone has a 31.75 mm (1.250 in) bore and a cone width of 19.05 mm. FULI's catalog pairs it with cup 15245 (62 mm outside diameter, 19.05 mm total width).
The next smaller cone on this site is 14125A, with a 31.75 mm bore (0 mm smaller) and cup 14276.
The next larger is 15125, with a 31.75 mm bore (0 mm larger) and cup 15245.
Cup 15245 is also listed with 15126, 15102, 15100, 15117 and 15125, 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 320/32 (32 × 58 × 17 mm). Its sizes differ from the 15123 pair, so the two are not interchangeable; it is given only as a size reference.
| Cone | Cup | d × D × T | Cr (kN) |
|---|---|---|---|
| 15120 | 15243 | 30.213 × 61.912 × 19.05 mm | 44.6 |
| 14116 | 14276 | 30.226 × 69.012 × 19.845 mm | 50.6 |
| 14125A | 14276 | 31.75 × 69.012 × 19.845 mm | 46.1 |
| 15123 | 15245 | 31.75 × 62 × 19.05 mm | 44.6 |
| 15125 | 15245 | 31.75 × 62 × 19.05 mm | 44.6 |
| 15126 | 15245 | 31.75 × 62 × 19.05 mm | 44.6 |
| 2790 | 2720 | 33.338 × 76.2 × 23.812 mm | 75 |
Sizes and Cr from FULI's catalog; — = not listed on this site.
15123 load ratings
15123/15245 has a dynamic load rating Cr of 44.6 kN and a static rating C0r of 50.7 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.
15123 size in inches and millimetres
15123 is made to inch sizes. The 31.75 mm bore is 1-1/4 in. The millimetre values in the catalog are conversions of the inch sizes.
| Dimension | Millimetres | Inches |
|---|---|---|
| Cone bore d | 31.75 mm | 1.2500 in |
| Cup outside diameter D (15245) | 62 mm | 2.4409 in |
| Total width T | 19.05 mm | 0.7500 in |
| Cone width B | 19.05 mm | 0.7500 in |
| Cup width C | 14.288 mm | 0.5625 in |
Converted at 1 in = 25.4 mm and rounded to four decimals.
Mounting 15123 (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 15123 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 15123
FULI supplies tapered roller bearings rust-protected and normally without grease; grease is packed in when the bearing is mounted. Relubricating 15123/15245 from the side takes about 5.91 g each time by the formula in our grease calculator: 0.005 × D × T = 0.005 × 62 × 19.05.
How FULI supplies 15123
15123 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 (19.05 mm for 15123/15245), 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 15123/15245.
Tools and guides for 15123
Typical applications
- Vehicle wheel hubs and axles
- Gearboxes and reducers
- Agricultural machinery
- Conveyor pulleys
FAQ
What size is 15123 in mm?
The 15123 cone has a 31.75 mm bore (1.250 in). With cup 15245 the bearing is 31.75 × 62 × 19.05 mm (d × D × T).
What is the difference between 15123 and 15125?
15125 has a 31.75 mm bore against 31.75 mm for 15123, and pairs with cup 15245 (31.75 × 62 × 19.05 mm) instead of 15245 (31.75 × 62 × 19.05 mm). The two are not interchangeable; order by the numbers on the old cone and cup.
How much grease does 15123/15245 need?
About 5.91 g each time it is relubricated from the side (0.005 × 62 × 19.05). FULI ships it rust-protected without grease, so the first fill is made at mounting.
Which cup goes with the 15123 cone?
FULI's catalog pairs the 15123 cone with cup 15245. Tell us whether you need the cone, the cup or both when you send the inquiry.
Is 15123 the same size across brands?
15123 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.