628 bearing dimensions & suffix variants
Look up recorded dimensions for designations beginning with 628. 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.
628 — published size and closure variants
628 is the base grouping for the specific records below. Read the complete designation and publisher on each row. The source unit is retained beside the converted unit. A shield or seal can change the width; equal bore and outside diameter do not establish the same envelope.
3 source-labelled records; 3 shown initially.
| Publisher / full model | Closure / material | d×D×B in mm | d×D×B in inches | Source unit |
|---|---|---|---|---|
| SMB628 | OpenChrome steel | 8× | 0.314961× | mm |
| SMB628ZZ | ShieldedChrome steel | 8× | 0.314961× | mm |
| SMB628-2RS | SealedChrome steel | 8× | 0.314961× | mm |
Keep RS, 2RS, ZZ and width suffixes distinct
The table records the publisher’s open, shielded or sealed column. An unlisted “RS” marking is not rewritten as “2RS”. Keep special endings such as W21, W23 or a fractional bore suffix: they can identify a different width or bore. No automatic cross-brand substitution is approved.
Metric values converted from printed inch decimals inherit the source rounding. For example, 0.2812 in converts to 7.14248 mm; that extra decimal detail is arithmetic, not a tolerance or a machining target. Never silently round an inch bearing into the nearest metric size. Missing speed, clearance, precision, internal ball diameter, material grade or exact lubricant remain unknown.
Publisher references: SMB product charts and Enduro 1600-series data; checked 2026-10-02. Original BearingScope interpretation. No stock, sales, vehicle fitment or redistributable CAD is implied. Material names describe the source page, not a certificate for every item sold under a similar number.
628 dimensions and recorded technical data
The recorded 628 base designation measures 8×24×8 mm (inside diameter d × outside diameter D × width B). This answer uses unsuffixed records from NSK, KOYO, 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. 24 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) |
|---|---|---|---|---|---|---|
| NSK628Deep groove ball bearing |
| 3.7 kN | 1.43 kN | — | — | 0.0172 kg17.2 g |
| KOYO628Deep groove ball bearing |
| 4.15 kN | 1.4 kN | — | 28000 rpmLimiting Speeds(Grease Lub.): 28000 min-1Limiting Speeds(Oil Lub.): 35000 min-1 | 0.018 kg18 g |
| EZO628Deep groove ball bearing |
| 3.33 kN | 1.41 kN | — | — | 0.0165 kg16.5 g |
| SKF628-2RS1Deep groove ball bearing with seals or shields |
| 3.9 kN | 1.66 kN | — | 19000 rpm | 0.018 kg18 g |
| SKF628-2ZDeep groove ball bearing with seals or shields |
| 3.9 kN | 1.66 kN | 63000 rpm | 32000 rpm | 0.018 kg18 g |
| SKF628/4-2ZDeep groove ball bearing with seals or shields |
| 0.423 kN | 0.116 kN | 140000 rpm | 70000 rpm | 0.001 kg1 g |
| SKF628/5-2ZDeep groove ball bearing with seals or shields |
| 0.468 kN | 0.143 kN | 120000 rpm | 60000 rpm | 0.0032 kg3.2 g |
| SKF628/6-2RS1Deep groove ball bearing with seals or shields |
| 0.88 kN | 0.35 kN | 110000 rpm | 53000 rpm | 0.00265 kg2.65 g |
| SKF628/6-2ZDeep groove ball bearing with seals or shields |
| 0.88 kN | 0.35 kN | 110000 rpm | 53000 rpm | 0.0027 kg2.7 g |
| SKF628/7-2ZDeep groove ball bearing with seals or shields |
| 0.78 kN | 0.26 kN | 100000 rpm | 50000 rpm | 0.003 kg3 g |
| SKF628/8-2RS1Deep groove ball bearing with seals or shields |
| 1.33 kN | 0.57 kN | — | 26000 rpm | 0.0041 kg4.1 g |
| SKF628/8-2RS1/W64Deep groove ball bearing |
| 1.33 kN | 0.57 kN | — | 20000 rpm | 0.0041 kg4.1 g |
| SKF628/8-2ZDeep groove ball bearing with seals or shields |
| 1.33 kN | 0.57 kN | 90000 rpm | 45000 rpm | 0.0038 kg3.8 g |
| SKF628/9-2RS1Deep groove ball bearing with seals or shields |
| 0.871 kN | 0.34 kN | — | 24000 rpm | 0.004 kg4 g |
| SKF628/9-2ZDeep groove ball bearing with seals or shields |
| 0.871 kN | 0.34 kN | 85000 rpm | 43000 rpm | 0.006 kg6 g |
| SKF628/9-ZDeep groove ball bearing with seals or shields |
| 0.871 kN | 0.34 kN | 85000 rpm | 53000 rpm | 0.0039 kg3.9 g |
| FAG628-2RSR-HLNDeep groove ball bearing |
| 3.55 kN | 1.41 kN | — | 20900 rpm | 0.018 kg18 g |
| FAG628-2Z-HLNDeep groove ball bearing |
| 3.55 kN | 1.41 kN | 29000 rpm | 38500 rpm | 0.018 kg18 g |
| NSK628DDDeep groove ball bearing |
| 3.7 kN | 1.43 kN | — | — | — |
| NSK628VVDeep groove ball bearing |
| 3.7 kN | 1.43 kN | — | — | — |
| NSK628ZZDeep groove ball bearing |
| 3.7 kN | 1.43 kN | — | — | 0.0174 kg17.4 g |
| KOYO628 2RSDeep groove ball bearing |
| 4.15 kN | 1.4 kN | — | 22000 rpmLimiting Speeds(Grease Lub.): 22000 min-1Limiting Speeds(Oil Lub.): - min-1 | 0.018 kg18 g |
| KOYO628 2RUDeep groove ball bearing |
| 4.15 kN | 1.4 kN | — | 28000 rpmLimiting Speeds(Grease Lub.): 28000 min-1Limiting Speeds(Oil Lub.): - min-1 | 0.018 kg18 g |
| KOYO628 ZZDeep groove ball bearing |
| 4.15 kN | 1.4 kN | — | 28000 rpmLimiting Speeds(Grease Lub.): 28000 min-1Limiting Speeds(Oil Lub.): - min-1 | 0.018 kg18 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 628 | Open | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 628 | Open | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| EZO 628 | Open (no closure suffix in this catalogue marking) | Not recorded | Not recorded | Not recorded | High-carbon chromium bearing steel | Not recorded |
| SKF 628-2RS1 | Seal on both sides | P6 and tighter width tolerance | CN | Sheet metal | Bearing steel | Grease |
| SKF 628-2Z | Shield on both sides | P6 and tighter width tolerance | CN | Sheet metal | Bearing steel | Grease |
| SKF 628/4-2Z | Shield on both sides | P6 | CN | Not recorded | Bearing steel | Grease |
| SKF 628/5-2Z | Shield on both sides | P6 | CN | Not recorded | Bearing steel | Grease |
| SKF 628/6-2RS1 | Seal on both sides | Not recorded | CN | Not recorded | Bearing steel | Grease |
| SKF 628/6-2Z | Shield on both sides | P6 | CN | Not recorded | Bearing steel | Grease |
| SKF 628/7-2Z | Shield on both sides | P6 | CN | Not recorded | Bearing steel | Grease |
| SKF 628/8-2RS1 | Seal on both sides | Normal | CN | Sheet metal | Bearing steel | Grease |
| SKF 628/8-2RS1/W64 | Seal on both sides | Not recorded | CN | Sheet metal | Bearing steel | Solid Oil |
| SKF 628/8-2Z | Shield on both sides | Normal | CN | Sheet metal | Bearing steel | Grease |
| SKF 628/9-2RS1 | Seal on both sides | P6 | CN | Not recorded | Bearing steel | Grease |
| SKF 628/9-2Z | Shield on both sides | P6 | CN | Not recorded | Bearing steel | Grease |
| SKF 628/9-Z | Shield on one side | P6 | CN | Not recorded | Bearing steel | None |
| FAG 628-2RSR-HLN | 2RSR — Contact seal on both sides | PN — Normal (ISO 492:2023) | CN (Group N) — Normal internal clearance | JN — Steel sheet metal | Not recorded | Lubricating grease |
| FAG 628-2Z-HLN | 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 |
| NSK 628DD | Contact rubber seals on both sides (DD) | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NSK 628VV | Non-contact rubber seals on both sides (VV) | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NSK 628ZZ | Metal shields on both sides (ZZ) | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 628 2RS | Contact sealed 2RS | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 628 2RU | Non-contact sealed 2RU | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 628 ZZ | Shielded ZZ | 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.
628
Deep groove ball bearing
View full technical record →NSK628
Deep groove ball bearing
View full technical record →EZO628
Deep groove ball bearing
View full technical record →KOYO6280
Deep groove ball bearing
View full technical record →TIMKEN6280 / 6220
Tapered roller bearing
View full technical record →TIMKEN6280-90012
Tapered roller bearing
View full technical record →KOYO628 2RS
Deep groove ball bearing
View full technical record →SKF628-2RS1
Deep groove ball bearing with seals or shields
View full technical record →FAG628-2RSR-HLN
Deep groove ball bearing
View full technical record →KOYO628 2RU
Deep groove ball bearing
View full technical record →SKF628-2Z
Deep groove ball bearing with seals or shields
View full technical record →FAG628-2Z-HLN
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.