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| Parameter | FAG688>N8 × 16 × 4 mm | NSK688A8 × 16 × 4 mm | KOYO6888 × 16 × 4 mm | EZO6888 × 16 × 4 mm |
|---|---|---|---|---|
| Comparable specifications | ||||
| Brand | FAG | NSK | KOYO | EZO |
| Designation | 688>N | 688A | 688 | 688 |
| Product family | — | Single row deep groove ball bearings | Extra-small, miniature ball bearings / Standard type / Open | Miniature Ball Bearing |
| Detailed type | Deep groove ball bearings | Deep groove ball bearings | Deep groove ball bearings | Deep groove ball bearings |
| Series | 688 | — | — | — |
| Bore diameterd | 8 mm | 8 mm | 8 mm | 8 mm |
| Outside diameterD | 16 mm | 16 mm | 16 mm | 16 mm |
| WidthB | 4 mm | 4 mm | 4 mm | 4 mm |
| Basic dynamic load ratingC | 1.71 kN | 1.77 kN | 1.55 kN | 1.26 kN |
| Basic static load ratingC0 | 0.71 kN | 0.71 kN | 0.59 kN | 0.59 kN |
| Fatigue load limitPu | 0.044 kN | — | 0.02 kN | — |
| Reference speednref | 30000 r/min | — | — | — |
| Limiting speednG | 60000 r/min | — | 42000 r/min | — |
| Mass≈m | 0.0038 kg | 0.00312 kg | 0.003 kg | 0.00316 kg |
| Precision class | PN — Normal (ISO 492:2023) | — | — | — |
| Internal clearance | CN (Group N) — Normal internal clearance | — | — | — |
| Sealing | Without — Not sealed | Open | Open | Open (no closure suffix in this catalogue marking) |
| Cage | JN — Steel sheet metal | — | — | — |
| Bearing material | — | — | — | High-carbon chromium bearing steel |
| Lubricant | Without — Bearing not greased | — | — | — |
| Minimum operating temperatureTmin | -30 °C | — | — | — |
| Maximum operating temperatureTmax | 120 °C | — | — | — |
| Boundary dimensions | ||||
| 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 | — | — | — | 4 mm |
| Inner ring widthB | — | — | — | 0.1575 inch |
| Outer ring widthC | — | — | — | 4 mm |
| Outer ring widthC | — | — | — | 0.1575 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 |
| Calculation factors | ||||
| Calculation factorf0 | 13.9 | — | — | — |
| Capabilities & suitability | ||||
| Radial load capacity | Yes | — | — | — |
| Axial load capacity in one direction | Yes | — | — | — |
| Axial load capacity in both directions | Yes | — | — | — |
| Suitable for grease lubrication | Yes | — | — | — |
| Suitable for oil lubrication | Yes | — | — | — |
| Unsealed design | Yes | — | — | — |
| 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 | — | — |
| Closure interpretation | — | — | — | Open (no closure suffix in this catalogue marking) |
| Material interpretation | — | — | — | High-carbon chromium bearing steel |
| Dimensions | ||||
| Minimum chamfer dimensionrmin | 0.2 mm | — | — | — |
| Minimum chamfer dimensionrmin | 0.008 in | — | — | — |
| Shoulder diameter outer ringD1 | 13.8 mm | — | — | — |
| Shoulder diameter outer ringD1 | 0.543 in | — | — | — |
| Shoulder diameter inner ringd1 | 10.2 mm | — | — | — |
| Shoulder diameter inner ringd1 | 0.402 in | — | — | — |
| 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 |
| Main Dimensions & Performance Data | ||||
| Basic dynamic load rating, radialCr | 1,710 N | — | — | — |
| Basic dynamic load rating, radialCr | 384.442 lbf | — | — | — |
| Basic static load rating, radialC0r | 710 N | — | — | — |
| Basic static load rating, radialC0r | 159.622 lbf | — | — | — |
| Fatigue load limit, radialCur | 44 N | — | — | — |
| Fatigue load limit, radialCur | 9.892 lbf | — | — | — |
| Manufacturer Identity | ||||
| Schaeffler Product Code | 2400522 | — | — | — |
| Official Class Key | — | — | 010-020-010 | — |
| Base Type | 688 | — | — | — |
| Gpsd Group | S02 | — | — | — |
| Product Line Id | 14 | — | — | — |
| SAP material number | 0841183930000 | — | — | — |
| Base product | 2305080101 | — | — | — |
| Mounting dimensions | ||||
| Minimum shaft shoulder diameter (open)da min. | — | 9.6 mm | — | — |
| Maximum adjacent fillet radiusra max. | — | 0.2 mm | — | — |
| Maximum housing shoulder diameter (open)Da max. | — | 14.4 mm | — | — |
| Adjacent mounting dimension (da min)da min | — | — | — | 13.6 mm |
| Adjacent mounting dimension (da min)da min | — | — | — | 0.5354 inch |
| Adjacent mounting dimension (da max)da max | — | — | — | 14.4 mm |
| Adjacent mounting dimension (da max)da max | — | — | — | 0.5669 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 |
| Adjacent mounting dimension (r ase max)r ase max | — | — | — | 0.2 mm |
| Adjacent mounting dimension (r ase max)r ase max | — | — | — | 0.0079 inch |
| Minimum diameter shaft shoulderda min | 9.4 mm | — | — | — |
| Minimum diameter shaft shoulderda min | 0.37 in | — | — | — |
| Maximum diameter of housing shoulderDa max | 14.6 mm | — | — | — |
| Maximum diameter of housing shoulderDa max | 0.575 in | — | — | — |
| Maximum fillet radiusra max | 0.2 mm | — | — | — |
| Maximum fillet radiusra max | 0.008 in | — | — | — |
| Product characteristics | ||||
| Version code>N | Not marked on bearing | — | — | — |
| Type of SealWithout | Not sealed | — | — | — |
| Tolerance classPN | Normal (ISO 492:2023) | — | — | — |
| Dimensional / heat stabilizationSN | Rings dimensional stabilized up to 120° | — | — | — |
| Radial internal clearanceCN (Group N) | Normal internal clearance | — | — | — |
| Bore typeZ | Cylindrical | — | — | — |
| Product Identity | ||||
| Construction | Deep groove ball bearing 68.., single row, steel sheet metal cage | — | — | — |
| Short Description | Deep groove ball bearing | — | — | — |
| Reference mass | ||||
| Approximate catalogue mass (open) | — | 3.12 g | — | — |
| Reference mass | — | — | — | 3.16 g |
| Rolling elements | ||||
| Ball diameterDw | — | — | — | 2 mm |
| Ball quantityZ | — | — | — | 10 |
| Technical Data | ||||
| d | — | — | 16 mm | — |
| B | — | — | 4 mm | — |
| Bore Diameter (D) | 8 mm | — | — | — |
| R(Min.) | — | — | 0.2 mm | — |
| Outside Diameter (D) | 16 mm | — | — | — |
| Basic Load Ratings : Cr | — | — | 1.55 kN | — |
| Width (B) | 4 mm | — | — | — |
| Basic Load Ratings : C0R | — | — | 0.59 kN | — |
| Basic Dynamic Load Rating, Radial (Cr) | 1,710 N | — | — | — |
| Fatigue Load Limit : Cu | — | — | 0.020 kN | — |
| Basic Static Load Rating, Radial (C0R) | 710 N | — | — | — |
| Factor : F0 | — | — | 14.0 | — |
| Operating Temperature Min. (Tmin) | -30 °C | — | — | — |
| Limiting Speeds(Grease Lub.) | — | — | 42000 min-1 | — |
| Limiting Speed (Ng) | 60,000 1/min | — | — | — |
| Limiting Speeds(Oil Lub.) | — | — | 50000 min-1 | — |
| Operating Temperature Max. (Tmax) | 120 °C | — | — | — |
| Da(Min.) | — | — | 9.6 mm | — |
| Reference Speed (Nϑr) | 30,000 1/min | — | — | — |
| Da(Max.) | — | — | 14.4 mm | — |
| Calculation Factor (F0) | 13.9 | — | — | — |
| Ra(Max.) | — | — | 0.2 mm | — |
| Fatigue Load Limit, Radial (Cur) | 44 N | — | — | — |
| Mass(Refer.) | — | — | 3.2 g | — |
| Minimum Diameter Shaft Shoulder (Da Min) | 9.4 mm | — | — | — |
| Shoulder Diameter Inner Ring (D1) | 10.2 mm | — | — | — |
| Maximum Diameter Of Housing Shoulder (Da Max) | 14.6 mm | — | — | — |
| Minimum Chamfer Dimension (Rmin) | 0.2 mm | — | — | — |
| Maximum Fillet Radius (Ra Max) | 0.2 mm | — | — | — |
| Shoulder Diameter Outer Ring (D1) | 13.8 mm | — | — | — |
| Temperature range | ||||
| Operating temperature min.Tmin | -30 °C | — | — | — |
| Operating temperature min.Tmin | -22 °F | — | — | — |
| Operating temperature max.Tmax | 120 °C | — | — | — |
| Operating temperature max.Tmax | 248 °F | — | — | — |
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.