684 bearing dimensions & suffix variants
Look up recorded dimensions for designations beginning with 684. The table retains complete manufacturer designations so special suffixes and different dimensional variants remain visible.
On this page5 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.
684 dimensions and recorded technical data
The recorded 684 base designation measures 4×9×2.5 mm (inside diameter d × outside diameter D × width B). This answer uses unsuffixed records from KOYO. 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. 6 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) |
|---|---|---|---|---|---|---|
| KOYO684Deep groove ball bearing |
| 0.8 kN | 0.23 kN | — | 59000 rpmLimiting Speeds(Grease Lub.): 59000 min-1Limiting Speeds(Oil Lub.): 70000 min-1 | 0 kg0 g |
| FAG684-2Z>NDeep groove ball bearing |
| 0.68 kN | 0.228 kN | 63000 rpm | 80000 rpm | 0.002 kg2 g |
| FAG684>NDeep groove ball bearing |
| 0.68 kN | 0.228 kN | 47000 rpm | 94000 rpm | 0.00065 kg0.65 g |
| NSK684ADeep groove ball bearing |
| 0.705 kN | 0.225 kN | — | — | 0.00063 kg0.63 g |
| NSK684AZZ1Deep groove ball bearing |
| 0.705 kN | 0.225 kN | — | — | 0.00101 kg1.01 g |
| EZO684ZZDeep groove ball bearing |
| 0.641 kN | 0.226 kN | — | — | 0.00095 kg0.95 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 |
|---|---|---|---|---|---|---|
| KOYO 684 | Open | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| FAG 684-2Z>N | 2Z — Non-contact shield on both sides | PN — Normal (ISO 492:2023) | CN (Group N) — Normal internal clearance | JN — Steel sheet metal | Not recorded | Lubricating grease |
| FAG 684>N | Without — Not sealed | PN — Normal (ISO 492:2023) | CN (Group N) — Normal internal clearance | JN — Steel sheet metal | Not recorded | Without — Bearing not greased |
| NSK 684A | Open | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NSK 684AZZ1 | Metal shields on both sides (ZZ1) | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| EZO 684ZZ | Two pressed-steel shields | 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.
684
Deep groove ball bearing
View full technical record →KOYO6840
Deep groove ball bearing
View full technical record →NSK6840
Deep groove ball bearing
View full technical record →FAG684-2Z>N
Deep groove ball bearing
View full technical record →KOYO6844
Deep groove ball bearing
View full technical record →NSK6844
Deep groove ball bearing
View full technical record →NSK6844ZZS
Deep groove ball bearing
View full technical record →TIMKEN68450 / 68709
Tapered roller bearing
View full technical record →TIMKEN68450 / 68712
Tapered roller bearing
View full technical record →TIMKEN68450 / 68726
Tapered roller bearing
View full technical record →KOYO68450/712
Tapered roller bearing
View full technical record →TIMKEN68462 / 68709
Tapered roller 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.