Cross-brand designation analysis
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You entered 638DD. This table explores the base group 638; it does not preserve or approve every requested suffix. Search your complete marking first →
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One base designation across loaded brands
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“638” across 4 loaded brands
At least two brands share the same bore, outside diameter and width. Use Custom Compare when you want to choose exact suffix variants yourself.
Technical comparison
Choose exact variants instead →Brand differences at a glance
| Parameter | FAG638-2Z>N8 × 28 × 9 mm | NSK6388 × 28 × 9 mm | KOYO6388 × 28 × 9 mm | EZO6388 × 28 × 9 mm |
|---|---|---|---|---|
| Comparable specifications | ||||
| Brand | FAG | NSK | KOYO | EZO |
| Designation | 638-2Z>N | 638 | 638 | 638 |
| 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 | 638 | — | — | — |
| Bore diameterd | 8 mm | 8 mm | 8 mm | 8 mm |
| Outside diameterD | 28 mm | 28 mm | 28 mm | 28 mm |
| WidthB | 9 mm | 9 mm | 9 mm | 9 mm |
| Basic dynamic load ratingC | 4.85 kN | 5.05 kN | 5.65 kN | 4.58 kN |
| Basic static load ratingC0 | 1.97 kN | 1.97 kN | 1.95 kN | 1.97 kN |
| Fatigue load limitPu | 0.122 kN | — | 0.1 kN | — |
| Reference speednref | 24600 r/min | — | — | — |
| Limiting speednG | 34500 r/min | — | 26000 r/min | — |
| Mass≈m | 0.0303 kg | 0.0283 kg | 0.029 kg | 0.0272 kg |
| Precision class | PN — Normal (ISO 492:2023) | — | — | — |
| Internal clearance | CN (Group N) — Normal internal clearance | — | — | — |
| Sealing | 2Z — Non-contact shield on both sides | Open | Open | Open (no closure suffix in this catalogue marking) |
| Cage | JN — Steel sheet metal | — | — | — |
| Bearing material | — | — | — | High-carbon chromium bearing steel |
| Lubricant | Lubricating grease | — | — | — |
| Minimum operating temperatureTmin | -30 °C | — | — | — |
| Maximum operating temperatureTmax | 120 °C | — | — | — |
| Boundary dimensions | ||||
| Bearing width (open)B | — | 9 mm | — | — |
| Outer diameterD | — | — | — | 28 mm |
| Minimum bearing chamferr min. | — | 0.3 mm | — | — |
| Outer diameterD | — | — | — | 1.1024 inch |
| Inner ring widthB | — | — | — | 9 mm |
| Inner ring widthB | — | — | — | 0.3543 inch |
| Outer ring widthC | — | — | — | 9 mm |
| Outer ring widthC | — | — | — | 0.3543 inch |
| Inner ring chamfer dimensionr si min | — | — | — | 0.3 mm |
| Inner ring chamfer dimensionr si min | — | — | — | 0.0118 inch |
| Outer ring chamfer dimensionr se min | — | — | — | 0.3 mm |
| Outer ring chamfer dimensionr se min | — | — | — | 0.0118 inch |
| Calculation factors | ||||
| Calculation factorf0 | 12.4 | — | — | — |
| Capabilities & suitability | ||||
| Radial load capacity | Yes | — | — | — |
| Axial load capacity in one direction | Yes | — | — | — |
| Axial load capacity in both directions | Yes | — | — | — |
| Lifetimelubricationfreedomfrommaintenance | Yes | — | — | — |
| Suitable for grease lubrication | Yes | — | — | — |
| Sealedonbothsides | 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 | 0.3 mm | — | — | — |
| Minimum chamfer dimensionrmin | 0.012 in | — | — | — |
| Shoulder diameter outer ringD1 | 21.5 mm | — | — | — |
| Shoulder diameter outer ringD1 | 0.846 in | — | — | — |
| Caliber diameter outer ringD2 | 22.7 mm | — | — | — |
| Caliber diameter outer ringD2 | 0.894 in | — | — | — |
| Shoulder diameter inner ringd1 | 14.5 mm | — | — | — |
| Shoulder diameter inner ringd1 | 0.571 in | — | — | — |
| Caliber diameter inner ringd2 | 12.7 mm | — | — | — |
| Caliber diameter inner ringd2 | 0.5 in | — | — | — |
| Load ratings | ||||
| Basic dynamic radial load ratingCr | — | 5050 N | — | — |
| Basic static radial load ratingC0r | — | 1970 N | — | — |
| Lubrication-qualified speed | ||||
| Limiting speed with grease | — | 28000 r/min | — | — |
| Limiting speed with oil (open) | — | 34000 r/min | — | — |
| Catalogue limiting speed (grease) | — | — | — | 28000 r/min |
| Catalogue limiting speed (oil) | — | — | — | 33000 r/min |
| Main Dimensions & Performance Data | ||||
| Basic dynamic load rating, radialCr | 4,850 N | — | — | — |
| Basic dynamic load rating, radialCr | 1,090.378 lbf | — | — | — |
| Basic static load rating, radialC0r | 1,970 N | — | — | — |
| Basic static load rating, radialC0r | 442.896 lbf | — | — | — |
| Fatigue load limit, radialCur | 122 N | — | — | — |
| Fatigue load limit, radialCur | 27.428 lbf | — | — | — |
| Manufacturer Identity | ||||
| Schaeffler Product Code | 2496350 | — | — | — |
| Official Class Key | — | — | 010-020-010 | — |
| Base Type | 638 | — | — | — |
| Gpsd Group | S02 | — | — | — |
| Product Line Id | 14 | — | — | — |
| SAP material number | 3008627920000 | — | — | — |
| Base product | 2305080101 | — | — | — |
| Mounting dimensions | ||||
| Minimum shaft shoulder diameter (open)da min. | — | 10 mm | — | — |
| Maximum adjacent fillet radiusra max. | — | 0.3 mm | — | — |
| Maximum housing shoulder diameter (open)Da max. | — | 26 mm | — | — |
| Adjacent mounting dimension (da min)da min | — | — | — | 22.5 mm |
| Adjacent mounting dimension (da min)da min | — | — | — | 0.8858 inch |
| Adjacent mounting dimension (da max)da max | — | — | — | 26 mm |
| Adjacent mounting dimension (da max)da max | — | — | — | 1.0236 inch |
| Adjacent mounting dimension (r asi max)r asi max | — | — | — | 0.3 mm |
| Adjacent mounting dimension (r asi max)r asi max | — | — | — | 0.0118 inch |
| Adjacent mounting dimension (r ase max)r ase max | — | — | — | 0.3 mm |
| Adjacent mounting dimension (r ase max)r ase max | — | — | — | 0.0118 inch |
| Minimum diameter shaft shoulderda min | 10 mm | — | — | — |
| Minimum diameter shaft shoulderda min | 0.394 in | — | — | — |
| Maximum diameter of housing shoulderDa max | 26 mm | — | — | — |
| Maximum diameter of housing shoulderDa max | 1.024 in | — | — | — |
| Maximum fillet radiusra max | 0.3 mm | — | — | — |
| Maximum fillet radiusra max | 0.012 in | — | — | — |
| Product characteristics | ||||
| Version code>N | Not marked on bearing | — | — | — |
| Type of Seal2Z | Non-contact shield on both sides | — | — | — |
| 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 63..-2Z, single row, shields, steel sheet metal cage | — | — | — |
| Short Description | Deep groove ball bearing | — | — | — |
| Reference mass | ||||
| Approximate catalogue mass (open) | — | 28.3 g | — | — |
| Reference mass | — | — | — | 27.2 g |
| Rolling elements | ||||
| Ball diameterDw | — | — | — | 4.762 mm |
| Ball quantityZ | — | — | — | 7 |
| Technical Data | ||||
| d | — | — | 28 mm | — |
| B | — | — | 9 mm | — |
| Bore Diameter (D) | 8 mm | — | — | — |
| R(Min.) | — | — | 0.3 mm | — |
| Outside Diameter (D) | 28 mm | — | — | — |
| Basic Load Ratings : Cr | — | — | 5.65 kN | — |
| Width (B) | 9 mm | — | — | — |
| Basic Load Ratings : C0R | — | — | 1.95 kN | — |
| Basic Dynamic Load Rating, Radial (Cr) | 4,850 N | — | — | — |
| Fatigue Load Limit : Cu | — | — | 0.100 kN | — |
| Basic Static Load Rating, Radial (C0R) | 1,970 N | — | — | — |
| Factor : F0 | — | — | 12.3 | — |
| Operating Temperature Min. (Tmin) | -30 °C | — | — | — |
| Limiting Speeds(Grease Lub.) | — | — | 26000 min-1 | — |
| Limiting Speed (Ng) | 34,500 1/min | — | — | — |
| Limiting Speeds(Oil Lub.) | — | — | 32000 min-1 | — |
| Operating Temperature Max. (Tmax) | 120 °C | — | — | — |
| Da(Min.) | — | — | 10 mm | — |
| Reference Speed (Nϑr) | 24,600 1/min | — | — | — |
| Da(Max.) | — | — | 26 mm | — |
| Calculation Factor (F0) | 12.4 | — | — | — |
| Ra(Max.) | — | — | 0.3 mm | — |
| Fatigue Load Limit, Radial (Cur) | 122 N | — | — | — |
| Mass(Refer.) | — | — | 29 g | — |
| Minimum Diameter Shaft Shoulder (Da Min) | 10 mm | — | — | — |
| Shoulder Diameter Inner Ring (D1) | 14.5 mm | — | — | — |
| Maximum Diameter Of Housing Shoulder (Da Max) | 26 mm | — | — | — |
| Minimum Chamfer Dimension (Rmin) | 0.3 mm | — | — | — |
| Caliber Diameter Inner Ring (D1) | 12.7 mm | — | — | — |
| Maximum Fillet Radius (Ra Max) | 0.3 mm | — | — | — |
| Shoulder Diameter Outer Ring (D1) | 21.5 mm | — | — | — |
| Caliber Diameter Outer Ring (D1) | 22.7 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 | — | — | — |
Automatic matching is a search aid, not an interchangeability declaration. Confirm the full suffix, tolerances, internal design and application limits before substitution.