30312 Bearing Dimensions
30312 tapered roller bearing: 60 mm bore, 130 mm OD, 33.5 mm total width (FULI catalog). Designation breakdown and size-equivalent codes. Quote.
30312 specifications
| Bore d | 60 mm |
|---|---|
| Outside diameter D | 130 mm |
| Total width T | 33.5 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 30200/30300 series sizes: 30309 bearing · 30311 bearing · 30313 bearing · 30314 bearing
Grease quantity for 30312: bearing grease fill calculator.
Buying 30312 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 30312 designation
| Segment | Meaning |
|---|---|
| 3 | Single row tapered roller bearing (metric, ISO 355) |
| 03 | Dimension series 03 |
| 12 | Bore code 12 → 60 mm bore. ISO bore code (00–03 = 10/12/15/17 mm; 04 and above = code × 5 mm). |
30312 interchange
30312 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 30312
FULI makes 30312 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 60 × 130 × 33.5 mm size.
| Dimension | Nominal, mm | Deviation, µm | Limits, mm |
|---|---|---|---|
| Bore d (Δdmp) | 60 | 0 / −15 | 60.000 / 59.985 |
| Outside diameter D (ΔDmp) | 130 | 0 / −20 | 130.000 / 129.980 |
| Total width T (ΔTs) | 33.5 | +200 / 0 | 33.700 / 33.500 |
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 / −150 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 60 m5 for the shaft of 30312. 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 30312 |
|---|---|---|---|
| Shaft 60 m5 | +24 / +11 | 60.024 / 60.011 | 11 to 39 µm interference |
| Housing 130 H7 | +40 / 0 | 130.040 / 130.000 | 0 to 60 µm clearance |
| Housing 130 J7 | +26 / −14 | 130.026 / 129.986 | 14 µm interference to 46 µm clearance |
Taking the loosest and the tightest combination of limits, a P0 30312 on a 60 mm m5 shaft has 11 to 39 µm interference. Its cup has 0 to 60 µm clearance in an H7 bore and 14 µm interference to 46 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.
30312 compared with nearby sizes
30312 measures 60 × 130 × 33.5 mm: bore d, outside diameter D and total width T. Other tapered roller bearings on this site for the same 60 mm shaft are 33012 (60 × 95 × 27 mm), 30212 (60 × 110 × 23.75 mm), 32212 (60 × 110 × 29.75 mm) and 32312 (60 × 130 × 48.5 mm).
32312 is the next heavier choice for a 60 mm shaft, with the same 130 mm outside diameter and 15 mm more width (48.5 mm).
32212 is the lighter option on the same shaft, with an outside diameter 20 mm smaller (110 mm) and 3.75 mm less width (29.75 mm), for housings with less room.
30215 has the same 130 mm outside diameter with a 75 mm bore, so it fits the same housing bore on a larger shaft.
32215 has the same 130 mm outside diameter with a 75 mm bore, so it fits the same housing bore on a larger shaft.
In the 303 series the sizes either side of 30312 are 30311 for a 55 mm shaft and 30313 for a 65 mm shaft.
| Model | Compared with this page | d × D × T (mm) | Cr (kN) | Weight (kg) |
|---|---|---|---|---|
| 30312 | This page | 60 × 130 × 33.5 | — | — |
| 30311 | Next size down | 55 × 120 × 31.5 | 153.30 | 1.635 |
| 30313 | Next size up | 65 × 140 × 36 | 195.90 | 2.44 |
| 33012 | Same bore | 60 × 95 × 27 | 96.7 | 0.691 |
| 30212 | Same bore | 60 × 110 × 23.75 | 103.30 | 0.905 |
| 32212 | Same bore | 60 × 110 × 29.75 | 132.80 | 1.168 |
| 32312 | Same bore | 60 × 130 × 48.5 | 226.7 | 2.9 |
| 30215 | Same outside diameter | 75 × 130 × 27.25 | 138.40 | 1.36 |
| 32215 | Same outside diameter | 75 × 130 × 33.25 | 170.30 | 1.75 |
Cr and weight from FULI's catalog; — = not listed on this site.
30312 cone and cup
30312 is supplied as a complete bearing: the cone (inner ring with rollers and cage) and the cup (outer ring). The total width T of 33.5 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 30312 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.
30312 dimensions in inches
The nearest common inch shaft size to the 60 mm bore of 30312 is 2-3/8 in (60.33 mm), 0.33 mm larger than the bore, so 30312 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 | 60 mm | 2.3622 in |
| Outside diameter D | 130 mm | 5.1181 in |
| Total width T | 33.5 mm | 1.3189 in |
Converted at 1 in = 25.4 mm and rounded to four decimals. The bearing itself is made to the millimetre sizes.
Grease for 30312
FULI supplies tapered roller bearings rust-protected and normally without grease; grease is added when 30312 is mounted. Relubricating 30312 from the side takes about 21.8 g each time by the formula in our grease calculator: 0.005 × D × T = 0.005 × 130 × 33.5.
How FULI supplies 30312
The standard 30312 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 (33.5 mm for 30312) 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 30312.
Tools and guides for 30312
- 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 30312 and 32312?
Both fit a 60 mm shaft. 30312 is 60 × 130 × 33.5 mm and 32312 is 60 × 130 × 48.5 mm, so 32312 has the same 130 mm outside diameter and 15 mm more width (48.5 mm). Choose 32312 for a higher load where the housing has room for it; 30312 keeps the housing smaller.
What is the difference between 30312 and 32212?
Both fit a 60 mm shaft. 30312 is 60 × 130 × 33.5 mm and 32212 is 60 × 110 × 29.75 mm, so 32212 has an outside diameter 20 mm smaller (110 mm) and 3.75 mm less width (29.75 mm). 32212 suits a housing with less room; 30312 carries more load.
What size is 30312 in inches?
30312 is 2.3622 × 5.1181 × 1.3189 in (60 × 130 × 33.5 mm, d × D × T). The nearest common inch shaft size to the 60 mm bore of 30312 is 2-3/8 in (60.33 mm), 0.33 mm larger than the bore, so 30312 will not go on it. Use an inch bearing on an inch shaft.
How much grease does 30312 need?
About 21.8 g each time it is relubricated from the side (0.005 × 130 × 33.5). FULI ships 30312 rust-protected without grease, so the first fill is made at mounting.
Is 30312 the same size across brands?
Bore d, outside diameter D and total width T are the same: 30312 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 30312?
Load ratings for 30312 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.