629-ZZ bearing: complete specifications & equivalents
The 629-ZZ is a ISO 15 radial bearing sized 9 x 26 x 8 mm (bore x OD x width) with ZZ sealing. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 9 mm |
| Outer diameter D | 26 mm |
| Width B | 8 mm |
| Material | GCr15 |
| Seal / shield | ZZ |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 4.75 kN |
| Basic static load rating C0 | 1.96 kN |
| Fatigue load limit Pu | 0.083 kN |
| Reference speed (thermal) | 60000 rpm |
| Limiting speed (mechanical) | 30000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 21 g |
| Manufacturer designation | 629-2Z |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-27 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-27
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.
Dimensions in inches & 6200-series range
| Bore d | 0.354 in |
|---|---|
| Outer diameter D | 1.024 in |
| Width B | 0.315 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 8.5 mm |
| Smallest bore in 6200-series | 3 mm |
| Largest outer diameter in 6200-series | 540 mm |
| Width range across 6200-series | 2.5–85 mm |
| Bore position in 6200-series (smallest first) | 6 of 45 |
| Bore above smallest 6200-series size | 6 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 629 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 9×26×8 mm envelope and equivalent catalogue ratings; 629 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs. |
| 629-2RS | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 9×26×8 mm envelope and equivalent catalogue ratings; 629-2RSH is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs. |
| 629-RSR | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 9×26×8 mm envelope and equivalent catalogue ratings; 629-2RSL is the low-friction non-contact seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs. |
| W629-2RS | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 9×26×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (4.75/1.96 kN vs 3.97/1.96 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty. |
| W629-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 9×26×8 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (4.75/1.96 kN vs 3.97/1.96 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 629-ZZ model number is decoded
In the 6200-series, the final digit is the bore in millimetres: 629 fits a 9 mm shaft (direct-number miniature spelling). The envelope is 9×26×8 mm (0.354×1.024×0.315 in) with a 8.5 mm radial section height, C 4.75 kN, C0 1.96 kN and Pu 0.083 kN. SKF spells the double shield 629-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 30000 r/min, catalogue mass 21 g.
Typical equipment & failure modes
Common applications
- instrument and encoder drives
- model-making and hobby mechanics
- small pumps
- office equipment
Known failure patterns
- fine-particle abrasion when non-contact shields let dust through in a dirty environment
- grease aging inside the shielded cavity with no relubrication path
- cage damage from running beyond the limiting speed
- raceway smearing under marginal lubrication at start-up
Selection pitfalls — read before you substitute
- Deep-groove geometry tolerates only minutes of misalignment; if the 26 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 629-ZZ.
- Assign interference to the rotating ring: on a conventional shaft-mounted 9 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.
- Shields on 629-ZZ are non-contact: chips and coarse dust stay out, but water passes straight through — specify the sealed 629-2RS for washdown duty.
- Do not pry the caps off 629-ZZ to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.
- Clearance suffixes follow the seal code in the designation stack (e.g. 629-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.
- At 9 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.
Frequently asked questions
What are the dimensions of 629-ZZ?
The SKF 629-2Z measures 9 mm bore × 26 mm OD × 8 mm width (0.354 × 1.024 × 0.315 in), mass about 21 g. It has two non-contact sheet-metal shields.
How do I read the 629 designation?
Small miniature bearings print the bore as the final digit, so 629 is a 9 mm bearing; the series digits in front give the section (OD/width family).
What is the difference between 629-ZZ and a same-bore 62-series bearing?
Section height differs: 629-ZZ has a 8.5 mm radial section and C 4.75 kN; always match d, D and B — same bore alone never makes two bearings interchangeable.
Which fits should I use for 629-ZZ?
With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 26 mm housing; reverse the interference if the outer ring rotates.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-27. Read our editorial & correction policy.