6003 Bearing Dimensions
6003 is a deep groove ball bearing with a 17 mm bore, 35 mm outer diameter and 10 mm width (17×35×10 mm, ISO 15). Open, ZZ, 2RS variants, designation breakdown, size-equivalent codes. Quote.
6003 specifications
| Bore d | 17 mm |
|---|---|
| Outside diameter D | 35 mm |
| Width B | 10 mm |
| Seal / shield options | Open; ZZ (two metal shields); 2RS (two rubber seals) |
| Material | GCr15 chrome bearing steel (rings and rolling elements) |
| Precision | P0 (standard); P6 on request |
| Vibration grade | Z3V3 (standard); other grades on request |
| Radial clearance | C0 (standard); C3 on request |
Load ratings & speed
| Dynamic load rating Cr | 6.12 kN |
|---|---|
| Static load rating C0r | 3.22 kN |
| Limiting speed, grease | 19,000 rpm |
| Limiting speed, oil | 23,000 rpm |
| Weight | 0.041 kg — approx. |
Values from FULI's catalog; confirm for your application.
Nearby 6000 series sizes: 6001 bearing · 6002 bearing · 6004 bearing · 6005 bearing
Grease quantity for 6003: bearing grease fill calculator.
Buying 6003 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 6003 designation
| Segment | Meaning |
|---|---|
| 6 | Single row deep groove ball bearing |
| 0 | Dimension series 10 (extra light) |
| 03 | Bore code 03 → 17 mm bore. ISO bore code (00–03 = 10/12/15/17 mm; 04 and above = code × 5 mm). |
6003 cross reference by brand
The basic number 6003 means the same boundary dimensions at every maker listed here (17 × 35 × 10 mm). The suffix for shields, seals and clearance is written differently by each maker.
| Version | FULI | SKF | Timken | NSK | NTN | Koyo | NACHI |
|---|---|---|---|---|---|---|---|
| Open | 6003 | 6003 | 6003 | 6003 | 6003 | 6003 | 6003 |
| Shields both sides | 6003ZZ | 6003-2Z | 6003-ZZ | 6003ZZ | 6003ZZ | 6003 ZZ | 6003ZZE |
| Contact seals both sides | 6003-2RS | 6003-2RSH | 6003-2RS | 6003DDU | 6003LLU | 6003 2RS | 6003-2NSE |
| Contact seals + C3 | 6003-2RS C3 | 6003-2RSH/C3 | 6003-2RS-C3 | — | — | — | — |
— = ask us. FULI radial clearance is C0 as standard and C3 on request.
SKF cross reference · Timken and Fafnir cross reference · NSK, NTN, Koyo and NACHI cross reference · Suffix meanings
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 6003
FULI makes 6003 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 17 × 35 × 10 mm size.
| Dimension | Nominal, mm | Deviation, µm | Limits, mm |
|---|---|---|---|
| Bore d (Δdmp) | 17 | 0 / −8 | 17.000 / 16.992 |
| Outside diameter D (ΔDmp) | 35 | 0 / −11 | 35.000 / 34.989 |
| Width B (ΔBs) | 10 | 0 / −120 | 10.000 / 9.880 |
Δdmp and ΔDmp: deviation of the mean bore and mean outside diameter in one radial plane. ΔBs: inner ring width; the outer ring width has the same limits.
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 17 j5 for the shaft of 6003. The housing bore is usually H7, or J7 where the outer ring must not creep.
| Seat | Deviation, µm | Limits, mm | Fit with 6003 |
|---|---|---|---|
| Shaft 17 j5 | +5 / −3 | 17.005 / 16.997 | 13 µm interference to 3 µm clearance |
| Housing 35 H7 | +25 / 0 | 35.025 / 35.000 | 0 to 36 µm clearance |
| Housing 35 J7 | +14 / −11 | 35.014 / 34.989 | 11 µm interference to 25 µm clearance |
Taking the loosest and the tightest combination of limits, a P0 6003 on a 17 mm j5 shaft has 13 µm interference to 3 µm clearance. Its outer ring has 0 to 36 µm clearance in an H7 bore and 11 µm interference to 25 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. A tight shaft fit or a hot housing uses up internal clearance, and that is when C3 is chosen instead of C0.
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.
6003 compared with nearby sizes
6003 measures 17 × 35 × 10 mm: bore d, outside diameter D and width B. Other deep groove ball bearings on this site for the same 17 mm shaft are 6703 (17 × 23 × 4 mm), 6803 (17 × 26 × 5 mm), 6903 (17 × 30 × 7 mm), 16003 (17 × 35 × 8 mm), 6203 (17 × 40 × 12 mm), 6303 (17 × 47 × 14 mm) and 6403 (17 × 62 × 17 mm).
6203 is the next heavier choice for a 17 mm shaft, with an outside diameter 5 mm larger (40 mm) and 2 mm more width (12 mm). In FULI's catalog 6203 has a dynamic load rating of 8.64 kN against 6.12 kN and a weight of about 0.067 kg against 0.041 kg for 6003.
16003 is the lighter option on the same shaft, with the same 35 mm outside diameter and 2 mm less width (8 mm), for housings with less room. In FULI's catalog 16003 has a dynamic load rating of 6.12 kN against 6.12 kN and a weight of about 0.033 kg against 0.041 kg for 6003.
6202 has the same 35 mm outside diameter with a 15 mm bore, so it fits the same housing bore on a smaller shaft.
6300 has the same 35 mm outside diameter with a 10 mm bore, so it fits the same housing bore on a smaller shaft.
In the 60 (extra light) series the sizes either side of 6003 are 6002 for a 15 mm shaft and 6004 for a 20 mm shaft.
| Model | Compared with this page | d × D × B (mm) | Cr (kN) | Weight (kg) |
|---|---|---|---|---|
| 6003 | This page | 17 × 35 × 10 | 6.12 | 0.041 |
| 6002 | Next size down | 15 × 32 × 9 | 5.04 | 0.031 |
| 6004 | Next size up | 20 × 42 × 12 | 8.46 | 0.068 |
| 6703 | Same bore | 17 × 23 × 4 | 1.20 | 0.004 |
| 6803 | Same bore | 17 × 26 × 5 | 2.53 | 0.007 |
| 6903 | Same bore | 17 × 30 × 7 | 4.46 | 0.017 |
| 16003 | Same bore | 17 × 35 × 8 | 6.12 | 0.033 |
| 6203 | Same bore | 17 × 40 × 12 | 8.64 | 0.067 |
| 6303 | Same bore | 17 × 47 × 14 | 12.15 | 0.113 |
| 6202 | Same outside diameter | 15 × 35 × 11 | 6.98 | 0.045 |
| 6300 | Same outside diameter | 10 × 35 × 11 | 7.38 | 0.052 |
Cr and weight from FULI's catalog; — = not listed on this site.
6003 weight, load ratings and speed
FULI's catalog gives the weight of 6003 as about 0.041 kg, so 100 bearings weigh about 4.1 kg and 1,000 about 41 kg before packing. The open, ZZ and 2RS versions share this catalog line.
6003 has a dynamic load rating Cr of 6.12 kN and a static load rating C0r of 3.22 kN. Cr is the load used to work out rating life; C0r is the reference for loads carried while the bearing is stationary or turning slowly. Limiting speeds in the catalog are 19,000 rpm with grease and 23,000 rpm with oil.
Contact seals add friction at the lip, so 6003-2RS usually runs below the speed of the open bearing. Ask us for the limit of the version you order.
Values from FULI's catalog; confirm for your application.
6003 versions: open, ZZ, 2RS and C3
Every version of 6003 has the same 17 × 35 × 10 mm boundary dimensions; only the cover between the rings and the internal clearance change. FULI supplies open, ZZ and 2RS versions, with C0 clearance as standard and C3 on request. Other makers write the same covers as 2Z or ZZ for shields and 2RS1, DDU or LLU for contact seals.
| Designation | What it is | Typical choice |
|---|---|---|
| 6003 | Open, no shields or seals | Housings with their own oil or grease supply |
| 6003-ZZ | Two metal shields, non-contact, greased | Motors and fans where dust is light |
| 6003-2RS | Two rubber contact seals, greased | Pumps, farm machinery and other wet or dusty places |
| 6003-ZZ C3 | ZZ with the larger C3 radial clearance | Tight shaft fit or a housing that runs hot |
| 6003-2RS C3 | 2RS with C3 radial clearance | Sealed bearings on a tight fit or running hot |
6003 dimensions in inches
The nearest common inch shaft size to the 17 mm bore of 6003 is 11/16 in (17.46 mm), 0.46 mm larger than the bore, so 6003 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 | 17 mm | 0.6693 in |
| Outside diameter D | 35 mm | 1.3780 in |
| Width B | 10 mm | 0.3937 in |
Converted at 1 in = 25.4 mm and rounded to four decimals. The bearing itself is made to the millimetre sizes.
Grease for 6003
FULI fills sealed 6003-2RS and 6003-ZZ bearings to about 30% of the free internal space as standard. The fill is set on an automatic greasing machine after sample sets are weighed before and after greasing. In normal use, sealed bearings usually do not need regreasing. A different fill level, a low-noise grease or a grease for a stated temperature range can be written on the order; for North America a range of −40 to 120 °C is often asked for.
Relubricating 6003 from the side takes about 1.75 g each time by the formula in our grease calculator: 0.005 × D × B = 0.005 × 35 × 10. This applies to the open 6003 in a housing with a grease supply.
How FULI supplies 6003
The standard 6003 from FULI has GCr15 chrome steel rings and balls, P0 precision, C0 radial clearance and vibration grade Z3V3; P6, C3 and other vibration grades are made on request. Radial clearance is set on automatic assembly equipment and sampled during production. Orders with a noise or vibration requirement are tested set by set 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 leave out the prefix or suffix letters are the usual cause of a wrong quote, so write the full designation, for example 6003-2RS C3.
Tools and guides for 6003
- Bearing size finder: look up a size from bore, OD and width
- Bearing weight chart
- Bearing grease fill calculator
- Shaft and housing tolerance chart
- Open, ZZ or 2RS seal selector
- Bearing internal clearance: C0, C3 and when to change
- Bearing lubrication basics
- Noise grade and precision class
- Ball bearing vs roller bearing
- All bearing products and model pages
Typical applications
- Electric motors
- Fans and blowers
- Water pumps
- Gearboxes
- Agricultural and textile machinery
FAQ
What is the difference between 6003 and 6203?
Both fit a 17 mm shaft. 6003 is 17 × 35 × 10 mm and 6203 is 17 × 40 × 12 mm, so 6203 has an outside diameter 5 mm larger (40 mm) and 2 mm more width (12 mm). In FULI's catalog 6203 has a dynamic load rating of 8.64 kN against 6.12 kN and a weight of about 0.067 kg against 0.041 kg for 6003. Choose 6203 for a higher load where the housing has room for it; 6003 keeps the housing smaller.
What is the difference between 6003 and 16003?
Both fit a 17 mm shaft. 6003 is 17 × 35 × 10 mm and 16003 is 17 × 35 × 8 mm, so 16003 has the same 35 mm outside diameter and 2 mm less width (8 mm). In FULI's catalog 16003 has a dynamic load rating of 6.12 kN against 6.12 kN and a weight of about 0.033 kg against 0.041 kg for 6003. 16003 suits a housing with less room; 6003 carries more load.
What size is 6003 in inches?
6003 is 0.6693 × 1.3780 × 0.3937 in (17 × 35 × 10 mm, d × D × B). The nearest common inch shaft size to the 17 mm bore of 6003 is 11/16 in (17.46 mm), 0.46 mm larger than the bore, so 6003 will not go on it. Use an inch bearing on an inch shaft.
How much does 6003 weigh?
About 0.041 kg in FULI's catalog, so 100 pieces weigh about 4.1 kg before packing. The open, ZZ and 2RS versions share this catalog line.
What is the difference between 6003-ZZ and 6003-2RS?
Both are 17 × 35 × 10 mm, the same as the open 6003. 6003-ZZ has two metal shields that do not touch the inner ring, so it runs with little drag but only keeps out coarse dirt. 6003-2RS has two rubber seals whose lips touch the inner ring; it keeps out water and fine dust at the cost of more friction. FULI fills both to about 30% of the free space.
How much grease does 6003 need?
Sealed 6003-2RS and 6003-ZZ come filled to about 30% of the free space and in normal use usually do not need regreasing. An open 6003 relubricated from the side takes about 1.75 g each time (0.005 × 35 × 10).
Is 6003 the same size across brands?
Yes. 6003 is an ISO designation, so the bore, outside diameter and width are the same whichever manufacturer made it. Brand-specific suffixes only change details such as seals, clearance or cage.