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| Parameter | NSKF688A8 × 16 × 4 mm | KOYOF6888 × 16 × 4 mm | EZOF688ZZ8 × 16 × 5 mm |
|---|---|---|---|
| Comparable specifications | |||
| Brand | NSK | KOYO | EZO |
| Designation | F688A | F688 | F688ZZ |
| Product family | Single row deep groove ball bearings | Extra-small, miniature ball bearings / Flanged type / Open | Flanged Miniature Ball Bearing |
| Detailed type | Deep groove ball bearings | Deep groove ball bearings | Deep groove ball bearings |
| Bore diameterd | 8 mm | 8 mm | 8 mm |
| Outside diameterD | 16 mm | 16 mm | 16 mm |
| WidthB | 4 mm | 4 mm | 5 mm |
| Basic dynamic load ratingC | 1.77 kN | 1.55 kN | 1.26 kN |
| Basic static load ratingC0 | 0.71 kN | 0.59 kN | 0.59 kN |
| Fatigue load limitPu | — | 0.02 kN | — |
| Limiting speednG | — | 42000 r/min | — |
| Mass≈m | 0.00354 kg | 0.003 kg | 0.00425 kg |
| Sealing | Open | Open | Two pressed-steel shields |
| Bearing material | — | — | High-carbon chromium bearing steel |
| Boundary dimensions | |||
| Body outside diameterD | 16 mm | — | — |
| Bearing width (open)B | 4 mm | — | — |
| Outer diameterD | — | — | 16 mm |
| Minimum bearing chamferr min. | 0.2 mm | — | — |
| Outer diameterD | — | — | 0.6299 inch |
| Inner ring widthB | — | — | 5 mm |
| Inner ring widthB | — | — | 0.1969 inch |
| Outer ring widthC | — | — | 5 mm |
| Outer ring widthC | — | — | 0.1969 inch |
| Inner ring chamfer dimensionr si min | — | — | 0.2 mm |
| Inner ring chamfer dimensionr si min | — | — | 0.0079 inch |
| Outer ring chamfer dimensionr se min | — | — | 0.2 mm |
| Outer ring chamfer dimensionr se min | — | — | 0.0079 inch |
| Flange outer diameterD 1 | — | — | 18 mm |
| Flange outer diameterD 1 | — | — | 0.7087 inch |
| Flange widthC 1 | — | — | 1.1 mm |
| Flange widthC 1 | — | — | 0.0433 inch |
| Classification | |||
| Official Category Path | — | Deep groove ball bearings - Extra-small, miniature ball bearings - Flanged type - Open | — |
| Official Classification 1 | — | Deep groove ball bearings / Extra-small, miniature ball bearings / Flanged type / Open | — |
| Construction | |||
| Catalogue closure construction | Open | — | — |
| Closure interpretation | — | — | Two pressed-steel shields |
| Material interpretation | — | — | High-carbon chromium bearing steel |
| Flange dimensions | |||
| Flange outside diameterD1 | 18 mm | — | — |
| Flange widthC1 | 1 mm | — | — |
| Load ratings | |||
| Basic dynamic radial load ratingCr | 1770 N | — | — |
| Basic static radial load ratingC0r | 710 N | — | — |
| Lubrication-qualified speed | |||
| Limiting speed with grease | 36000 r/min | — | — |
| Limiting speed with oil (open) | 43000 r/min | — | — |
| Catalogue limiting speed (grease) | — | — | 40000 r/min |
| Catalogue limiting speed (oil) | — | — | 47000 r/min |
| Manufacturer Identity | |||
| Official Class Key | — | 010-020-020 | — |
| Mounting dimensions | |||
| Minimum shaft shoulder diameter (open)da min. | 9.6 mm | — | — |
| Maximum adjacent fillet radiusra max. | 0.2 mm | — | — |
| Adjacent mounting dimension (da min)da min | — | — | 9.5 mm |
| Adjacent mounting dimension (da min)da min | — | — | 0.374 inch |
| Adjacent mounting dimension (da max)da max | — | — | 9.6 mm |
| Adjacent mounting dimension (da max)da max | — | — | 0.378 inch |
| Adjacent mounting dimension (r asi max)r asi max | — | — | 0.2 mm |
| Adjacent mounting dimension (r asi max)r asi max | — | — | 0.0079 inch |
| Reference mass | |||
| Approximate catalogue mass (open) | 3.54 g | — | — |
| Reference mass | — | — | 4.25 g |
| Rolling elements | |||
| Ball diameterDw | — | — | 2 mm |
| Ball quantityZ | — | — | 10 |
| Technical Data | |||
| d | — | 16 mm | — |
| B | — | 4 mm | — |
| R(Min.) | — | 0.2 mm | — |
| Basic Load Ratings : Cr | — | 1.55 kN | — |
| Basic Load Ratings : C0R | — | 0.59 kN | — |
| Fatigue Load Limit : Cu | — | 0.020 kN | — |
| Factor : F0 | — | 14.8 | — |
| Limiting Speeds(Grease Lub.) | — | 42000 min-1 | — |
| Limiting Speeds(Oil Lub.) | — | 50000 min-1 | — |
| Dimensions Of Flange D1 | — | 18 mm | — |
| Dimensions Of Flange C1 | — | 1 mm | — |
| Da(Min.) | — | 9.6 mm | — |
| Ra(Max.) | — | 0.2 mm | — |
| Mass(Refer.) | — | 3.6 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.