JM511945 Bearing Dimensions
JM511945 tapered roller bearing cone, paired with the 3920 cup: 65 mm bore, 112.712 mm OD, 29.02 mm width (FULI catalog). Quote.
JM511945 specifications
| Cone bore d | 65 mm (2.559 in) |
|---|---|
| Cone width B | 30 mm |
| Matching cup | 3920 |
| Cup outside diameter D | 112.712 mm (4.437 in) |
| Total width T | 29.02 mm (1.143 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 |
JM511945 cone and cup pairs
| Cone | Cup | Bore d | OD D | Width T | Cr (kN) | C0r (kN) |
|---|---|---|---|---|---|---|
| JM511945 | 3920 | 65 mm (2.559 in) | 112.712 mm (4.437 in) | 29.02 mm (1.143 in) | 120.3 | 175.7 |
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 JM511945 designation
| Segment | Meaning |
|---|---|
| JM | Prefix JM: J-line, medium series (J-line tapered roller bearing with metric boundary dimensions) |
| 511945 | Series and part number of the cone; the matching cup has its own number, listed in the pairs table on this page |
JM511945 interchange
JM511945 is a J-line tapered roller bearing cone with metric boundary dimensions, numbered like inch tapered bearings. 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.
JM511945 compared with nearby cone sizes
The JM511945 cone has a 65 mm (2.559 in) bore and a cone width of 30 mm. FULI's catalog pairs it with cup 3920 (112.712 mm outside diameter, 29.02 mm total width).
The next smaller cone on this site is 39585, with a 63.5 mm bore (1.5 mm smaller) and cup 39520.
The next larger is 39590, with a 66.675 mm bore (1.67 mm larger) and cup 39520.
Cup 3920 is also listed with 3984, 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 33013 (65 × 100 × 27 mm). Its sizes differ from the JM511945 pair, so the two are not interchangeable; it is given only as a size reference.
| Cone | Cup | d × D × T | Cr (kN) |
|---|---|---|---|
| 555S | 552 | 57.15 × 123.825 × 38.1 mm | 163.8 |
| 390A | 394A | 63.5 × 110 × 22 mm | 88.6 |
| 39585 | 39520 | 63.5 × 112.712 × 30.162 mm | 144.9 |
| JM511945 | 3920 | 65 × 112.712 × 29.02 mm | 120.3 |
| 39590 | 39520 | 66.675 × 112.712 × 30.162 mm | 144.9 |
| 395A | 394A | 66.675 × 110 × 22 mm | 88.6 |
| 395S | 394A | 66.675 × 110 × 22 mm | 88.6 |
Sizes and Cr from FULI's catalog; — = not listed on this site.
JM511945 load ratings
JM511945/3920 has a dynamic load rating Cr of 120.3 kN and a static rating C0r of 175.7 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.
JM511945 size in inches and millimetres
JM511945 is a J-line number: the cone has a metric bore of 65 mm but is numbered in the inch system, so it is ordered by cone and cup number like an inch bearing. The cup it is listed with here, 3920, is 112.712 mm (4.437 in) outside diameter.
| Dimension | Millimetres | Inches |
|---|---|---|
| Cone bore d | 65 mm | 2.5591 in |
| Cup outside diameter D (3920) | 112.712 mm | 4.4375 in |
| Total width T | 29.02 mm | 1.1425 in |
| Cone width B | 30 mm | 1.1811 in |
| Cup width C | 23.812 mm | 0.9375 in |
Converted at 1 in = 25.4 mm and rounded to four decimals.
Mounting JM511945 (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 JM511945 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 JM511945
FULI supplies tapered roller bearings rust-protected and normally without grease; grease is packed in when the bearing is mounted. Relubricating JM511945/3920 from the side takes about 16.4 g each time by the formula in our grease calculator: 0.005 × D × T = 0.005 × 112.71 × 29.02.
How FULI supplies JM511945
JM511945 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 (29.02 mm for JM511945/3920), 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 JM511945/3920.
Tools and guides for JM511945
Typical applications
- Vehicle wheel hubs and axles
- Gearboxes and reducers
- Agricultural machinery
- Conveyor pulleys
FAQ
What size is JM511945 in mm?
The JM511945 cone has a 65 mm bore (2.559 in). With cup 3920 the bearing is 65 × 112.712 × 29.02 mm (d × D × T).
What is the difference between JM511945 and 39590?
39590 has a 66.675 mm bore against 65 mm for JM511945, and pairs with cup 39520 (66.675 × 112.712 × 30.162 mm) instead of 3920 (65 × 112.712 × 29.02 mm). The two are not interchangeable; order by the numbers on the old cone and cup.
How much grease does JM511945/3920 need?
About 16.4 g each time it is relubricated from the side (0.005 × 112.71 × 29.02). FULI ships it rust-protected without grease, so the first fill is made at mounting.
Which cup goes with the JM511945 cone?
FULI's catalog pairs the JM511945 cone with cup 3920. Tell us whether you need the cone, the cup or both when you send the inquiry.
Is JM511945 the same size across brands?
JM511945 is a J-line tapered roller bearing cone number (metric boundary dimensions). 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.