6904 bearing dimensions & suffix variants
Look up recorded dimensions for designations beginning with 6904. 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.
6904 — 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 series6904 | 20× | .7874× | 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 |
|---|---|---|---|
| 6904 | 6400 / 3700 N | 23000 / 19000 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.
6904 dimensions and recorded technical data
The recorded 6904 base designation measures 20×37×9 mm (inside diameter d × outside diameter D × width B). This answer uses unsuffixed records from NSK, KOYO, NACHI. 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. 17 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) |
|---|---|---|---|---|---|---|
| NSK6904Deep groove ball bearing |
| 7 kN | 3.7 kN | — | — | 0.037 kg37 g |
| KOYO6904Deep groove ball bearing |
| 7.95 kN | 3.7 kN | — | 19000 rpmLimiting Speeds(Grease Lub.): 19000 min-1Limiting Speeds(Oil Lub.): 23000 min-1 | 0.036 kg36 g |
| NACHI6904Deep groove ball bearing |
| 8.05 kN | 3.7 kN | — | — | 0.036 kg36 g |
| NSK6904DDUDeep groove ball bearing |
| 7 kN | 3.7 kN | — | — | — |
| NSK6904VVDeep groove ball bearing |
| 7 kN | 3.7 kN | — | — | — |
| NSK6904ZZDeep groove ball bearing |
| 7 kN | 3.7 kN | — | — | — |
| KOYO6904 2RDDeep groove ball bearing |
| 7.95 kN | 3.7 kN | — | 17000 rpmLimiting Speeds(Grease Lub.): 17000 min-1 | 0.036 kg36 g |
| KOYO6904 2RSDeep groove ball bearing |
| 7.95 kN | 3.7 kN | — | 11000 rpmLimiting Speeds(Grease Lub.): 11000 min-1 | 0.036 kg36 g |
| KOYO6904 2RUDeep groove ball bearing |
| 7.95 kN | 3.7 kN | — | 19000 rpmLimiting Speeds(Grease Lub.): 19000 min-1 | 0.036 kg36 g |
| KOYO6904NRDeep groove ball bearing |
| 7.95 kN | 3.7 kN | — | 19000 rpmLimiting Speeds(Grease Lub.): 19000 min-1Limiting Speeds(Oil Lub.): 23000 min-1 | 0.036 kg36 g |
| KOYO6904 ZZDeep groove ball bearing |
| 7.95 kN | 3.7 kN | — | 19000 rpmLimiting Speeds(Grease Lub.): 19000 min-1 | 0.036 kg36 g |
| NACHI6904-2NKEDeep groove ball bearing |
| 8.05 kN | 3.7 kN | — | — | — |
| NACHI6904-2NSEDeep groove ball bearing |
| 8.05 kN | 3.7 kN | — | — | — |
| NACHI6904NKEDeep groove ball bearing |
| 8.05 kN | 3.7 kN | — | — | — |
| NACHI6904NSEDeep groove ball bearing |
| 8.05 kN | 3.7 kN | — | — | — |
| NACHI6904ZEDeep groove ball bearing |
| 8.05 kN | 3.7 kN | — | — | — |
| NACHI6904ZZEDeep groove ball bearing |
| 8.05 kN | 3.7 kN | — | — | — |
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 6904 | Open | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 6904 | Open | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NACHI 6904 | Open | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NSK 6904DDU | Contact rubber seals on both sides | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NSK 6904VV | Non-contact rubber seals on both sides | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NSK 6904ZZ | Metal shields on both sides | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 6904 2RD | Extremely light contact sealed | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 6904 2RS | Contact sealed | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 6904 2RU | Non-contact sealed | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 6904NR | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 6904 ZZ | Shielded ZZ | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NACHI 6904-2NKE | Two non-contact seals | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NACHI 6904-2NSE | Two contact seals | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NACHI 6904NKE | One non-contact seal | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NACHI 6904NSE | One contact seal | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NACHI 6904ZE | One shield | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NACHI 6904ZZE | Two shields | Not recorded | Not recorded | Not recorded | Not recorded | 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.
6904
Deep groove ball bearing
View full technical record →NSK6904
Deep groove ball bearing
View full technical record →NACHI6904
Deep groove ball bearing
View full technical record →NACHI6904-2NKE
Deep groove ball bearing
View full technical record →NACHI6904-2NSE
Deep groove ball bearing
View full technical record →KOYO6904 2RD
Deep groove ball bearing
View full technical record →KOYO6904 2RS
Deep groove ball bearing
View full technical record →KOYO6904 2RU
Deep groove ball bearing
View full technical record →NSK6904DDU
Deep groove ball bearing
View full technical record →NACHI6904NKE
Deep groove ball bearing
View full technical record →KOYO6904NR
Deep groove ball bearing
View full technical record →NACHI6904NSE
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.