LM12748 Bearing Dimensions
LM12748 inch tapered roller bearing cone, paired with the LM12710 cup: 21.43 mm (0.844 in) bore, 45.237 mm OD, 15.494 mm width (FULI catalog). Quote.
LM12748 specifications
| Cone bore d | 21.43 mm (0.844 in) |
|---|---|
| Cone width B | 16.637 mm |
| Matching cup | LM12710 |
| Cup outside diameter D | 45.237 mm (1.781 in) |
| Total width T | 15.494 mm (0.61 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 |
LM12748 cone and cup pairs
| Cone | Cup | Bore d | OD D | Width T | Cr (kN) | C0r (kN) |
|---|---|---|---|---|---|---|
| LM12748 | LM12710 | 21.43 mm (0.844 in) | 45.237 mm (1.781 in) | 15.494 mm (0.61 in) | 29.6 | 34.1 |
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 LM12748 designation
| Segment | Meaning |
|---|---|
| LM | Prefix LM: light-medium series (inch tapered roller bearing numbering) |
| 12748 | Series and part number of the cone; the matching cup has its own number, listed in the pairs table on this page |
LM12748 interchange
LM12748 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.
LM12748 compared with nearby cone sizes
The LM12748 cone has a 21.43 mm (0.844 in) bore and a cone width of 16.637 mm. FULI's catalog pairs it with cup LM12710 (45.237 mm outside diameter, 15.494 mm total width).
The next smaller cone on this site is LM11949, with a 19.05 mm bore (2.38 mm smaller) and cup LM11910.
The next larger is LM12749, with a 21.986 mm bore (0.56 mm larger) and cup LM12710.
Cup LM12710 is also listed with LM12749, 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 32004 (20 × 42 × 15 mm). Its sizes differ from the LM12748 pair, so the two are not interchangeable; it is given only as a size reference.
| Cone | Cup | d × D × T | Cr (kN) |
|---|---|---|---|
| LM11749 | LM11710 | 17.462 × 39.878 × 13.843 mm | 22.9 |
| LM11949 | LM11910 | 19.05 × 45.237 × 15.494 mm | 29.4 |
| LM12748 | LM12710 | 21.43 × 45.237 × 15.494 mm | 29.6 |
| LM12749 | LM12710 | 21.986 × 45.237 × 15.494 mm | 29.6 |
| 1779 | 1729 | 23.812 × 56.896 × 19.368 mm | 40.3 |
| 15100 | 15245 | 25.4 × 62 × 19.05 mm | — |
Sizes and Cr from FULI's catalog; — = not listed on this site.
LM12748 load ratings
LM12748/LM12710 has a dynamic load rating Cr of 29.6 kN and a static rating C0r of 34.1 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.
LM12748 size in inches and millimetres
LM12748 is made to inch sizes. The 21.43 mm bore is 0.8437 in; the nearest common fraction is 13/16 in (20.64 mm). The millimetre values in the catalog are conversions of the inch sizes.
| Dimension | Millimetres | Inches |
|---|---|---|
| Cone bore d | 21.43 mm | 0.8437 in |
| Cup outside diameter D (LM12710) | 45.237 mm | 1.7810 in |
| Total width T | 15.494 mm | 0.6100 in |
| Cone width B | 16.637 mm | 0.6550 in |
| Cup width C | 12.065 mm | 0.4750 in |
Converted at 1 in = 25.4 mm and rounded to four decimals.
Mounting LM12748 (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 LM12748 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 LM12748
FULI supplies tapered roller bearings rust-protected and normally without grease; grease is packed in when the bearing is mounted. Relubricating LM12748/LM12710 from the side takes about 3.50 g each time by the formula in our grease calculator: 0.005 × D × T = 0.005 × 45.24 × 15.49.
How FULI supplies LM12748
LM12748 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 (15.494 mm for LM12748/LM12710), 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 LM12748/LM12710.
Tools and guides for LM12748
Typical applications
- Vehicle wheel hubs and axles
- Gearboxes and reducers
- Agricultural machinery
- Conveyor pulleys
FAQ
What size is LM12748 in mm?
The LM12748 cone has a 21.43 mm bore (0.844 in). With cup LM12710 the bearing is 21.43 × 45.237 × 15.494 mm (d × D × T).
What is the difference between LM12748 and LM12749?
LM12749 has a 21.986 mm bore against 21.43 mm for LM12748, and pairs with cup LM12710 (21.986 × 45.237 × 15.494 mm) instead of LM12710 (21.43 × 45.237 × 15.494 mm). The two are not interchangeable; order by the numbers on the old cone and cup.
How much grease does LM12748/LM12710 need?
About 3.50 g each time it is relubricated from the side (0.005 × 45.24 × 15.49). FULI ships it rust-protected without grease, so the first fill is made at mounting.
Which cup goes with the LM12748 cone?
FULI's catalog pairs the LM12748 cone with cup LM12710. Tell us whether you need the cone, the cup or both when you send the inquiry.
Is LM12748 the same size across brands?
LM12748 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.