6903 bearing dimensions & suffix variants
Look up recorded dimensions for designations beginning with 6903. The table retains complete manufacturer designations so special suffixes and different dimensional variants remain visible.
On this page6 sections ⌄
Find by measured dimensions
Enter bore d, outside diameter D and width B. Use decimals or inch fractions such as 1/2 or 1 1/4.
6903 — PEER catalogue dimensions
Independent technical reference from PEER’s historical 2009 sheets; checked 2026-10-03. These are catalogue records, not current-stock claims or replacement approvals. Printed units are kept separate.
| Full catalogue model | d×D×B (mm) | d×D×B (in) | Closed width / execution scope |
|---|---|---|---|
| PEER · 6900 series6903 | 17× | .6693× | Base designation only; complete closure execution must be checked |
Read ratings without transferring them to another execution
Cr and Cor are catalogue basic load ratings, not allowable application loads. Oil/grease values below are explicitly for open bearings where supplied. They are not sealed-bearing or machine operating-speed approvals. A dash means withheld or not established here.
| Model | Dynamic Cr / static Cor | Open: oil / grease | Evidence boundary |
|---|---|---|---|
| 6903 | 4671 / 2579 N | 26000 / 22000 r/min | Base-row catalogue values only; no cross-brand transfer. |
Printed decimal conversions inherit catalogue rounding; more decimal places do not create manufacturing accuracy. Special bores must not be rounded to a nearby metric bearing. The historical table does not establish an exact RS/2RS, NR, ABEC, C3, ceramic, vehicle or kit execution unless explicitly listed. No CAD or interchange approval is implied.
6903 dimensions and recorded technical data
The recorded 6903 base designation measures 17×30×7 mm (inside diameter d × outside diameter D × width B). This answer uses unsuffixed records from NSK, KOYO, NACHI, EZO. It does not assign the same dimensions or operating ratings to every suffix.
The numeric series boundary is preserved: a longer number is not included merely because its first digits match. 19 recorded variants are listed. A dash means the value is missing, not zero.
No recorded variant matches these filters. Clear a filter to see other records; no substitute has been inferred.
| Brand / full designation | Named dimensions (mm / in) | Dynamic C (kN) | Static C0 (kN) | Reference speed (rpm) | Limiting speed (rpm) | Mass (kg / g) |
|---|---|---|---|---|---|---|
| NSK6903Deep groove ball bearing |
| 5.05 kN | 2.55 kN | — | — | 0.017 kg17 g |
| KOYO6903Deep groove ball bearing |
| 5.75 kN | 2.55 kN | — | 23000 rpmLimiting Speeds(Grease Lub.): 23000 min-1Limiting Speeds(Oil Lub.): 28000 min-1 | 0.018 kg18 g |
| NACHI6903Deep groove ball bearing |
| 5.8 kN | 2.55 kN | — | — | 0.018 kg18 g |
| EZO6903Deep groove ball bearing |
| 4.59 kN | 2.56 kN | — | — | 0.0156 kg15.6 g |
| NSK6903DDUDeep groove ball bearing |
| 5.05 kN | 2.55 kN | — | — | — |
| NSK6903VVDeep groove ball bearing |
| 5.05 kN | 2.55 kN | — | — | — |
| NSK6903ZZDeep groove ball bearing |
| 5.05 kN | 2.55 kN | — | — | — |
| KOYO6903 2RDDeep groove ball bearing |
| 5.75 kN | 2.55 kN | — | 21000 rpmLimiting Speeds(Grease Lub.): 21000 min-1 | 0.018 kg18 g |
| KOYO6903 2RSDeep groove ball bearing |
| 5.75 kN | 2.55 kN | — | 13000 rpmLimiting Speeds(Grease Lub.): 13000 min-1 | 0.018 kg18 g |
| KOYO6903 2RUDeep groove ball bearing |
| 5.75 kN | 2.55 kN | — | 23000 rpmLimiting Speeds(Grease Lub.): 23000 min-1 | 0.018 kg18 g |
| KOYO6903NRDeep groove ball bearing |
| 5.75 kN | 2.55 kN | — | 23000 rpmLimiting Speeds(Grease Lub.): 23000 min-1Limiting Speeds(Oil Lub.): 28000 min-1 | 0.018 kg18 g |
| KOYO6903 ZZDeep groove ball bearing |
| 5.75 kN | 2.55 kN | — | 23000 rpmLimiting Speeds(Grease Lub.): 23000 min-1 | 0.018 kg18 g |
| NACHI6903-2NKEDeep groove ball bearing |
| 5.8 kN | 2.55 kN | — | — | — |
| NACHI6903-2NSEDeep groove ball bearing |
| 5.8 kN | 2.55 kN | — | — | — |
| NACHI6903NKEDeep groove ball bearing |
| 5.8 kN | 2.55 kN | — | — | — |
| NACHI6903NSEDeep groove ball bearing |
| 5.8 kN | 2.55 kN | — | — | — |
| NACHI6903ZEDeep groove ball bearing |
| 5.8 kN | 2.55 kN | — | — | — |
| NACHI6903ZZEDeep groove ball bearing |
| 5.8 kN | 2.55 kN | — | — | — |
| EZO6903 2RSDeep groove ball bearing |
| 4.59 kN | 2.56 kN | — | — | 0.0165 kg16.5 g |
Compare recorded seals, clearance, precision and materials
Manufacturer wording is retained. A missing property is not inferred from another brand or a similar suffix.
| Brand / designation | Closure | Original precision | Clearance | Cage | Material | Lubricant |
|---|---|---|---|---|---|---|
| NSK 6903 | Open | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 6903 | Open | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NACHI 6903 | Open | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| EZO 6903 | Open (no closure suffix in this catalogue marking) | Not recorded | Not recorded | Not recorded | High-carbon chromium bearing steel | Not recorded |
| NSK 6903DDU | Contact rubber seals on both sides | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NSK 6903VV | Non-contact rubber seals on both sides | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NSK 6903ZZ | Metal shields on both sides | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 6903 2RD | Extremely light contact sealed | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 6903 2RS | Contact sealed | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 6903 2RU | Non-contact sealed | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 6903NR | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 6903 ZZ | Shielded ZZ | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NACHI 6903-2NKE | Two non-contact seals | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NACHI 6903-2NSE | Two contact seals | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NACHI 6903NKE | One non-contact seal | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NACHI 6903NSE | One contact seal | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NACHI 6903ZE | One shield | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NACHI 6903ZZE | Two shields | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| EZO 6903 2RS | Two contact rubber seals | Not recorded | Not recorded | Not recorded | High-carbon chromium bearing steel | Not recorded |
How to compare these values
- Use the displayed dimension names and original symbols. Housing length L, height H2 and flange width are not bearing outside diameter D. A catalogue width with an unverified symbol must not be assumed to be inner-ring width B or assembly width T. Open the product record for mounting dimensions and geometry.
- Inch values are calculated from the recorded millimetres using 25.4 mm per inch, rounded to six decimal places. They do not change a metric bearing into an inch-series bearing. Gram values are converted from the recorded mass in kilograms.
- C and C0 describe different rating conditions. They are not a single safe working-load limit and cannot replace an application load calculation.
- Reference and limiting speeds are separate catalogue values. The source grease/oil context is shown where recorded. Lubricant, seals, loads, fit, clearance and cooling affect the usable operating speed.
- A common base number does not prove equivalent seals, clearance, precision, material or interchangeability. Open the full designation for these fields.
Related prefix matches — other model numbers may appear
These discovery results can contain a longer number or a different component. They are not specifications for the requested exact model. Open the complete product to inspect its original geometry.
6903
Deep groove ball bearing
View full technical record →NSK6903
Deep groove ball bearing
View full technical record →NACHI6903
Deep groove ball bearing
View full technical record →EZO6903
Deep groove ball bearing
View full technical record →NACHI6903-2NKE
Deep groove ball bearing
View full technical record →NACHI6903-2NSE
Deep groove ball bearing
View full technical record →KOYO6903 2RD
Deep groove ball bearing
View full technical record →KOYO6903 2RS
Deep groove ball bearing
View full technical record →EZO6903 2RS
Deep groove ball bearing
View full technical record →KOYO6903 2RU
Deep groove ball bearing
View full technical record →NSK6903DDU
Deep groove ball bearing
View full technical record →NACHI6903NKE
Deep groove ball bearing
View full technical record →Check the drawing before substituting
Nominal dimensions are not shaft-fit tolerances. Different variants can add grooves, flanges, wider rings or assembly components. When the table has different dimensions, the complete designation—not the shared prefix—controls.
Reference basis & data limits
Manufacturer terminology is retained in the product records. Technical reference basis: JTEKT Basic Bearing Knowledge (boundary dimensions, tolerance classes and lubrication); NSK Bearing ABCs (lubrication, designations and clearance); NTN technical FAQs (closure codes and component interchange); SKF rolling-bearing selection and maintenance references.
Selection workflows and catalogue grouping are BearingScope editorial aids. Verify the current drawing and application requirements before using a candidate. Missing database information is not converted into an assumed match.