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| Parameter | SKF604-2Z4 × 12 × 4 mm | NSK6044 × 12 × 4 mm | KOYO6044 × 12 × 4 mm |
|---|---|---|---|
| Comparable specifications | |||
| Brand | SKF | NSK | KOYO |
| Designation | 604-2Z | 604 | 604 |
| Product family | Deep groove ball bearings | Single row deep groove ball bearings | Extra-small, miniature ball bearings / Standard type / Open |
| Detailed type | Deep groove ball bearing with seals or shields | Deep groove ball bearings | Deep groove ball bearings |
| Bore diameterd | 4 mm | 4 mm | 4 mm |
| Outside diameterD | 12 mm | 12 mm | 12 mm |
| WidthB | 4 mm | 4 mm | 4 mm |
| Basic dynamic load ratingC | 0.806 kN | 1.05 kN | 1.2 kN |
| Basic static load ratingC0 | 0.28 kN | 0.345 kN | 0.35 kN |
| Fatigue load limitPu | 0.012 kN | — | 0.009 kN |
| Reference speednref | 120000 r/min | — | — |
| Limiting speednG | 60000 r/min | — | 53000 r/min |
| Mass≈m | 0.0022 kg | 0.00225 kg | 0.002 kg |
| Precision class | Normal | — | — |
| Internal clearance | CN | — | — |
| Sealing | Shield on both sides | Open | Open |
| Cage | Sheet metal | — | — |
| Bearing material | Bearing steel | — | — |
| Lubricant | Grease | — | — |
| Boundary dimensions | |||
| Bearing width (open)B | — | 4 mm | — |
| Minimum bearing chamferr min. | — | 0.2 mm | — |
| Classification | |||
| Official Category Path | — | — | Deep groove ball bearings - Extra-small, miniature ball bearings - Standard type - Open |
| Official Classification 1 | — | — | Deep groove ball bearings / Extra-small, miniature ball bearings / Standard type / Open |
| Construction | |||
| Catalogue closure construction | — | Open | — |
| Engineering — Abutment dimensions | |||
| Diameter of shaft abutmentd a | max. 6 mm | — | — |
| Diameter of housing abutmentD a | max. 10.6 mm | — | — |
| Radius of shaft or housing filletr a | max. 0.2 mm | — | — |
| Engineering — Calculation data | |||
| Minimum load factork r | 0.03 | — | — |
| Calculation factorf 0 | 10 | — | — |
| Engineering — Dimensions | |||
| Deviation limits of mid-range bore diametert Δdmp | -0.008 to 0 mm | — | — |
| Deviation limits of mid-range outside diametert ΔDmp | -0.008 to 0 mm | — | — |
| Deviation limits of ring widtht ΔBs | -0.12 to 0 mm | — | — |
| Shoulder diameterd 1 | ≈ 6.1 mm | — | — |
| Recess diameterD 2 | ≈ 9.8 mm | — | — |
| Chamfer dimensionr 1,2 | min. 0.2 mm | — | — |
| ISO tolerance class for dimensions | Normal | — | — |
| Engineering — Tolerances of run-out | |||
| Range of section height at inner ring of assembled bearingt Kia | 10 µm | — | — |
| Range of section height at outer ring of assembled bearingt Kea | 15 µm | — | — |
| ISO tolerance class for geometrical tolerances | Normal | — | — |
| Load ratings | |||
| Basic dynamic radial load ratingCr | — | 1050 N | — |
| Basic static radial load ratingC0r | — | 345 N | — |
| Logistics | |||
| Product net weight | 0.0022 kg | — | — |
| eClass code | 23-05-08-01 | — | — |
| UNSPSC code | 31171504 | — | — |
| Lubrication-qualified speed | |||
| Limiting speed with grease | — | 48000 r/min | — |
| Limiting speed with oil (open) | — | 56000 r/min | — |
| Manufacturer Identity | |||
| Official Class Key | — | — | 010-020-010 |
| Mounting dimensions | |||
| Minimum shaft shoulder diameter (open)da min. | — | 5.6 mm | — |
| Maximum adjacent fillet radiusra max. | — | 0.2 mm | — |
| Maximum housing shoulder diameter (open)Da max. | — | 10.4 mm | — |
| Product identity | |||
| Official product category | Deep groove ball bearings | — | — |
| Official taxonomy path | /products/rolling-bearings/ball-bearings/deep-groove-ball-bearings | — | — |
| Structure group ID | BB1_001_101 | — | — |
| Available from SKF | Yes | — | — |
| Remanufacturable | No | — | — |
| Properties | |||
| Filling slots | Without | — | — |
| Number of rows | 1 | — | — |
| Locating feature, bearing outer ring | Without | — | — |
| Bore type | Cylindrical | — | — |
| Matched arrangement | No | — | — |
| Radial internal clearance | CN | — | — |
| Material, bearing | Bearing steel | — | — |
| Coating | Without | — | — |
| Sealing type | Non-contact | — | — |
| Relubrication feature | Without | — | — |
| Indicative carbon footprint for new product | 0.008 kg CO 2 e | — | — |
| Reference mass | |||
| Approximate catalogue mass (open) | — | 2.25 g | — |
| Technical Data | |||
| d | — | — | 12 mm |
| B | — | — | 4 mm |
| R(Min.) | — | — | 0.2 mm |
| Basic Load Ratings : Cr | — | — | 1.20 kN |
| Basic Load Ratings : C0R | — | — | 0.35 kN |
| Fatigue Load Limit : Cu | — | — | 0.009 kN |
| Factor : F0 | — | — | 12.4 |
| Limiting Speeds(Grease Lub.) | — | — | 53000 min-1 |
| Limiting Speeds(Oil Lub.) | — | — | 63000 min-1 |
| Da(Min.) | — | — | 5.6 mm |
| Da(Max.) | — | — | 10.4 mm |
| Ra(Max.) | — | — | 0.2 mm |
| Mass(Refer.) | — | — | 2.1 g |
Independent reference comparison based on the manufacturer data currently loaded. Always verify current limits, tolerances and suffix definitions with the official source before engineering selection.