25877 Bearing Dimensions
25877 inch tapered roller bearing cone, paired with the 25820 or 25821 cup: 34.925 mm (1.375 in) bore, 73.025 mm OD, 23.812 mm width (FULI catalog). Quote.
25877 specifications
| Cone bore d | 34.925 mm (1.375 in) |
|---|---|
| Cone width B | 24.608 mm |
| Matching cups | 25820, 25821 — sizes for each pair below |
| 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 |
25877 cone and cup pairs
| Cone | Cup | Bore d | OD D | Width T | Cr (kN) | C0r (kN) |
|---|---|---|---|---|---|---|
| 25877 | 25820 | 34.925 mm (1.375 in) | 73.025 mm (2.875 in) | 23.812 mm (0.937 in) | 72.3 | 87.7 |
| 25877 | 25821 | 34.925 mm (1.375 in) | 73.025 mm (2.875 in) | 23.812 mm (0.937 in) | 72.3 | 87.8 |
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 25877 designation
| Segment | Meaning |
|---|---|
| 2 | Spherical roller bearing (double row, self-aligning) |
| 58 | Dimension series 58 |
| 77 | Bore code 77 → 34.925 mm bore. ISO bore code (00–03 = 10/12/15/17 mm; 04 and above = code × 5 mm). |
25877 interchange
25877 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.
25877 compared with nearby cone sizes
The 25877 cone has a 34.925 mm (1.375 in) bore and a cone width of 24.608 mm. FULI's catalog pairs it with cup 25820 (73.025 mm outside diameter, 23.812 mm total width) and cup 25821 (73.025 mm outside diameter, 23.812 mm total width).
The next smaller cone on this site is 14137A, with a 34.925 mm bore (0 mm smaller) and cup 14276.
The next larger is HM88649, with a 34.925 mm bore (0 mm larger) and cup HM88610.
The metric tapered bearing on this site closest in bore is 32007 (35 × 62 × 18 mm). Its sizes differ from the 25877 pair, so the two are not interchangeable; it is given only as a size reference.
| Cone | Cup | d × D × T | Cr (kN) |
|---|---|---|---|
| 15126 | 15245 | 31.75 × 62 × 19.05 mm | 44.6 |
| 2790 | 2720 | 33.338 × 76.2 × 23.812 mm | 75 |
| 14137A | 14276 | 34.925 × 69.012 × 19.845 mm | 48.3 |
| 25877 | 25820 | 34.925 × 73.025 × 23.812 mm | 72.3 |
| 25877 | 25821 | 34.925 × 73.025 × 23.812 mm | 72.3 |
| HM88649 | HM88610 | 34.925 × 72.233 × 25.4 mm | 66.5 |
| LM48548 | LM48510 | 34.925 × 65.088 × 18.034 mm | 48.2 |
| LM48549 | LM48510 | 34.925 × 65.088 × 18.034 mm | 48.2 |
Sizes and Cr from FULI's catalog; — = not listed on this site.
25877 load ratings
25877/25820 has a dynamic load rating Cr of 72.3 kN and a static rating C0r of 87.7 kN and 25877/25821 has a dynamic load rating Cr of 72.3 kN and a static rating C0r of 87.8 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.
25877 size in inches and millimetres
25877 is made to inch sizes. The 34.925 mm bore is 1-3/8 in. The millimetre values in the catalog are conversions of the inch sizes.
| Dimension | Millimetres | Inches |
|---|---|---|
| Cone bore d | 34.925 mm | 1.3750 in |
| Cup outside diameter D (25820) | 73.025 mm | 2.8750 in |
| Total width T | 23.812 mm | 0.9375 in |
| Cone width B | 24.608 mm | 0.9688 in |
| Cup width C | 19.05 mm | 0.7500 in |
Converted at 1 in = 25.4 mm and rounded to four decimals.
Mounting 25877 (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 25877 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 25877
FULI supplies tapered roller bearings rust-protected and normally without grease; grease is packed in when the bearing is mounted. Relubricating 25877/25820 from the side takes about 8.69 g each time by the formula in our grease calculator: 0.005 × D × T = 0.005 × 73.03 × 23.81.
How FULI supplies 25877
25877 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 (23.812 mm for 25877/25820), 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 25877/25820.
Tools and guides for 25877
Typical applications
- Vehicle wheel hubs and axles
- Gearboxes and reducers
- Agricultural machinery
- Conveyor pulleys
FAQ
What size is 25877 in mm?
The 25877 cone has a 34.925 mm bore (1.375 in). With cup 25820 the bearing is 34.925 × 73.025 × 23.812 mm (d × D × T). With cup 25821 it is 73.025 mm outside diameter and 23.812 mm wide.
What is the difference between 25877 and HM88649?
HM88649 has a 34.925 mm bore against 34.925 mm for 25877, and pairs with cup HM88610 (34.925 × 72.233 × 25.4 mm) instead of 25820 (34.925 × 73.025 × 23.812 mm). The two are not interchangeable; order by the numbers on the old cone and cup.
How much grease does 25877/25820 need?
About 8.69 g each time it is relubricated from the side (0.005 × 73.03 × 23.81). FULI ships it rust-protected without grease, so the first fill is made at mounting.
Which cup goes with the 25877 cone?
FULI's catalog pairs the 25877 cone with cups 25820 and 25821. Tell us whether you need the cone, the cup or both when you send the inquiry.
Is 25877 the same size across brands?
25877 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.