32004 Bearing Dimensions
32004 tapered roller bearing: 20 mm bore, 42 mm OD, 15 mm total width (FULI catalog). Designation breakdown and size-equivalent codes. Quote.
32004 specifications
| Bore d | 20 mm |
|---|---|
| Outside diameter D | 42 mm |
| Total width T | 15 mm — assembled width of cup and cone |
| Seal / shield options | Open (cup and cone, no seals) |
| Material | GCr15 chrome bearing steel (rings and rolling elements) |
| Precision | P0 (standard); P6 on request |
| Radial clearance | Set during mounting (adjustable, not a C-class value) |
| Load ratings | Load ratings for this model are being checked against FULI's catalog. Ask for them with the quote. |
Nearby 32000 series sizes: 320/28 bearing · 320/32 bearing · 32005 bearing · 32006 bearing
Grease quantity for 32004: bearing grease fill calculator.
Buying 32004 in quantity? See bearing wholesale supplier for pricing by quantity and shipping, and bearing manufacturer in China for how to check the factory.
How to read the 32004 designation
| Segment | Meaning |
|---|---|
| 3 | Single row tapered roller bearing (metric, ISO 355) |
| 20 | Dimension series 20 |
| 04 | Bore code 04 → 20 mm bore. ISO bore code (00–03 = 10/12/15/17 mm; 04 and above = code × 5 mm). |
32004 interchange
32004 is an ISO designation: bore d, outside diameter D and total width T are the same at each maker. The letters each maker adds are series, design or cage codes, not seal codes, so the full number is different at every brand. Send us the full number on your old bearing and we confirm the match.
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.
Tolerances and fits for 32004
FULI makes 32004 to P0 as standard, with P6 on request. P0 is the Normal tolerance class of ISO 492; P6 limits are tighter. These are the P0 limits for the 20 × 42 × 15 mm size.
| Dimension | Nominal, mm | Deviation, µm | Limits, mm |
|---|---|---|---|
| Bore d (Δdmp) | 20 | 0 / −12 | 20.000 / 19.988 |
| Outside diameter D (ΔDmp) | 42 | 0 / −14 | 42.000 / 41.986 |
| Total width T (ΔTs) | 15 | +200 / 0 | 15.200 / 15.000 |
Δdmp and ΔDmp: deviation of the mean bore and mean outside diameter in one radial plane. ΔTs: assembled width of cone and cup, from the ISO 492 table for metric tapered roller bearings. Cone width B and cup width C: 0 / −120 µm each.
Shaft and housing fits (general guidance)
For an inner ring that turns with a solid steel shaft under normal load, bearing makers’ fit tables give 20 k5 for the shaft of 32004. The cup usually sits in an H7 or J7 housing bore so that it can be moved when the pair is adjusted.
| Seat | Deviation, µm | Limits, mm | Fit with 32004 |
|---|---|---|---|
| Shaft 20 k5 | +11 / +2 | 20.011 / 20.002 | 2 to 23 µm interference |
| Housing 42 H7 | +25 / 0 | 42.025 / 42.000 | 0 to 39 µm clearance |
| Housing 42 J7 | +14 / −11 | 42.014 / 41.989 | 11 µm interference to 28 µm clearance |
Taking the loosest and the tightest combination of limits, a P0 32004 on a 20 mm k5 shaft has 2 to 23 µm interference. Its cup has 0 to 39 µm clearance in an H7 bore and 11 µm interference to 28 µm clearance in a J7 bore.
This is general guidance, not a FULI specification. Heavy or shock loads, a hollow shaft, a thin-walled, split or light-alloy housing, or a large temperature difference between shaft and housing call for other classes, and the drawing of your machine takes priority.
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).
Sources: ISO 492 tables as printed in the NTN catalogue CAT. No. 2203/E (Tables 6.4 and 6.5) and the RKB tolerance catalogue; ISO 286-2 for the seats; SKF and NTN fit tables for the shaft and housing classes.
32004 compared with nearby sizes
32004 measures 20 × 42 × 15 mm: bore d, outside diameter D and total width T. Other tapered roller bearings on this site for the same 20 mm shaft are 30204 (20 × 47 × 15.25 mm), 32204 (20 × 47 × 19.25 mm) and 30304 (20 × 52 × 16.25 mm).
30204 is the next heavier choice for a 20 mm shaft, with an outside diameter 5 mm larger (47 mm) and 0.25 mm more width (15.25 mm).
30302 has the same 42 mm outside diameter with a 15 mm bore, so it fits the same housing bore on a smaller shaft.
In the 320 series the sizes either side of 32004 are 32005 for a 25 mm shaft.
| Model | Compared with this page | d × D × T (mm) | Cr (kN) | Weight (kg) |
|---|---|---|---|---|
| 32004 | This page | 20 × 42 × 15 | — | — |
| 32005 | Next size up | 25 × 47 × 15 | 28.00 | 0.111 |
| 30204 | Same bore | 20 × 47 × 15.25 | 28.20 | 0.126 |
| 32204 | Same bore | 20 × 47 × 19.25 | 30.30 | 0.157 |
| 30304 | Same bore | 20 × 52 × 16.25 | 33.10 | 0.166 |
| 30302 | Same outside diameter | 15 × 42 × 14.25 | 22.90 | 0.094 |
Cr and weight from FULI's catalog; — = not listed on this site.
32004 cone and cup
32004 is supplied as a complete bearing: the cone (inner ring with rollers and cage) and the cup (outer ring). The total width T of 15 mm applies when the two are assembled; the cone and the cup on their own are each narrower. Tell us if you need only the cone or only the cup.
Tapered roller bearings carry radial load and axial load in one direction, so 32004 is normally mounted as one of a pair facing each other, and the end play or preload is set when the pair is adjusted on the shaft. That is why FULI lists the clearance as set during mounting, not as a C-class value.
32004 dimensions in inches
The nearest common inch shaft size to the 20 mm bore of 32004 is 13/16 in (20.64 mm), 0.64 mm larger than the bore, so 32004 will not go on it. Inch shafts need an inch bearing, not a metric one with a sleeve or shim.
| Dimension | Millimetres | Inches |
|---|---|---|
| Bore d | 20 mm | 0.7874 in |
| Outside diameter D | 42 mm | 1.6535 in |
| Total width T | 15 mm | 0.5906 in |
Converted at 1 in = 25.4 mm and rounded to four decimals. The bearing itself is made to the millimetre sizes.
Grease for 32004
FULI supplies tapered roller bearings rust-protected and normally without grease; grease is added when 32004 is mounted. Relubricating 32004 from the side takes about 3.15 g each time by the formula in our grease calculator: 0.005 × D × T = 0.005 × 42 × 15.
How FULI supplies 32004
The standard 32004 from FULI has GCr15 chrome steel rings and rollers and P0 precision, with P6 on request. Where an order states a requirement for the total width T (15 mm for 32004) or the cone height, each set is checked on a height gauge.
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 leave out the prefix or suffix letters are the usual cause of a wrong quote, so write the full designation, for example 32004.
Tools and guides for 32004
- Bearing size finder: look up a size from bore, OD and width
- Bearing weight chart
- Bearing grease fill calculator
- Shaft and housing tolerance chart
- Tapered roller bearing number lookup
- Bearing lubrication basics
- Ball bearing vs roller bearing
- How to choose wheel hub bearings
- All bearing products and model pages
Typical applications
- Vehicle wheel hubs and axles
- Gearboxes and reducers
- Agricultural machinery
- Conveyor pulleys
FAQ
What is the difference between 32004 and 30204?
Both fit a 20 mm shaft. 32004 is 20 × 42 × 15 mm and 30204 is 20 × 47 × 15.25 mm, so 30204 has an outside diameter 5 mm larger (47 mm) and 0.25 mm more width (15.25 mm). Choose 30204 for a higher load where the housing has room for it; 32004 keeps the housing smaller.
What size is 32004 in inches?
32004 is 0.7874 × 1.6535 × 0.5906 in (20 × 42 × 15 mm, d × D × T). The nearest common inch shaft size to the 20 mm bore of 32004 is 13/16 in (20.64 mm), 0.64 mm larger than the bore, so 32004 will not go on it. Use an inch bearing on an inch shaft.
How much grease does 32004 need?
About 3.15 g each time it is relubricated from the side (0.005 × 42 × 15). FULI ships 32004 rust-protected without grease, so the first fill is made at mounting.
Is 32004 the same size across brands?
Bore d, outside diameter D and total width T are the same: 32004 is an ISO designation. The letters each maker adds (NSK HR and J, NTN 4T-, Koyo JR, FAG XL, SKF J2/Q) are series, design or cage codes, not seal codes.
Where are the load ratings for 32004?
Load ratings for 32004 are being checked against FULI's catalog and are not shown on this page yet. Model pages with a "Load ratings & speed" table carry values from FULI's catalog.