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| Parameter | SKFNNU 4168 M/W33340 × 580 × 243 mm | FAGNNU4168-M340 × 580 × 243 mm |
|---|---|---|
| Comparable specifications | ||
| Brand | SKF | FAG |
| Designation | NNU 4168 M/W33 | NNU4168-M |
| Product family | Cylindrical roller bearings | — |
| Detailed type | Double row cylindrical roller bearing | Cylindrical roller bearings |
| Series | — | NNU4168 |
| Bore diameterd | 340 mm | 340 mm |
| Outside diameterD | 580 mm | 580 mm |
| WidthB | 243 mm | 243 mm |
| Basic dynamic load ratingC | 4020 kN | 3950 kN |
| Basic static load ratingC0 | 7500 kN | 7700 kN |
| Fatigue load limitPu | 620 kN | 760 kN |
| Reference speednref | 950 r/min | — |
| Limiting speednG | 1200 r/min | — |
| Mass≈m | 261 kg | 268.73 kg |
| Precision class | — | PN — Normal (ISO 492:2023) |
| Internal clearance | CN | CN (Group N) — Normal internal clearance |
| Sealing | Without | — |
| Cage | — | M — Brass Cage |
| Lubricant | None | — |
| Minimum operating temperatureTmin | — | -30 °C |
| Maximum operating temperatureTmax | — | 150 °C |
| Capabilities & suitability | ||
| Largebearing | — | Yes |
| Dimensions | ||
| Minimum chamfer dimensionr1 min | — | 5 mm |
| Minimum chamfer dimensionr1 min | — | 0.197 in |
| Raceway diameter inner ringF | 402 mm | 402 mm |
| Raceway diameter inner ringF | — | 15.827 in |
| Axial displacements | — | 10.3 mm |
| Axial displacements | — | 0.406 in |
| Shoulder diameter outer ringD1 | — | 502.5 mm |
| Shoulder diameter outer ringD1 | — | 19.783 in |
| Engineering — Abutment dimensions | ||
| Abutment diameter spacer sleeved a | max. 392 mm | — |
| Abutment diameter shaftd b | min. 407 mm | — |
| Abutment diameter spacer sleeve / housingD a | max. 560 mm | — |
| Fillet radiusr a | max. 4 mm | — |
| Fillet radiusr b | max. 4 mm | — |
| Engineering — Calculation data | ||
| Calculation factork r | 0.35 | — |
| Engineering — Dimensions | ||
| Overall bearing widthB | 243 mm | — |
| Shoulder diameter outer ringD 1 | ≈ 510 mm | — |
| Width of annular grooveb | 16.7 mm | — |
| Diameter lubrication holeK | 9 mm | — |
| Chamfer dimension outer ringr 1,2 | min. 5 mm | — |
| Chamfer dimension inner ringr 3,4 | min. 5 mm | — |
| Permissible axial displacement from the normal position of one bearing ring relative to the others | max. 10 mm | — |
| Engineering — Engineering specifications | ||
| Design variant/feature | NNU/W33 | — |
| Logistics | ||
| Product net weight | 261.0 kg | — |
| eClass code | 23-05-09-01 | — |
| UNSPSC code | 31171505 | — |
| Main Dimensions & Performance Data | ||
| Basic dynamic load rating, radialCr | — | 3,950,000 N |
| Basic dynamic load rating, radialCr | — | 888,039.568 lbf |
| Basic static load rating, radialC0r | — | 7,700,000 N |
| Basic static load rating, radialC0r | — | 1,731,115.108 lbf |
| Fatigue load limit, radialCur | — | 760,000 N |
| Fatigue load limit, radialCur | — | 170,863.309 lbf |
| Limiting speed for grease lubricationnG Grease | — | 1,480 1/min |
| Limiting speed for oil lubricationnG Oil | — | 1,740 1/min |
| Manufacturer Identity | ||
| Schaeffler Product Code | — | 374579 |
| Base Type | — | NNU4168 |
| Gpsd Group | — | F01 |
| Product Line Id | — | 75 |
| SAP material number | — | 0591049020000 |
| Base product | — | 2305090141 |
| Bearing X designation | — | NNU4168-M |
| Mounting Manager ID | — | NNU4168-M |
| Grease application ID | — | NNU4168-M |
| Mounting dimensions | ||
| Diameter shaft shoulderda | — | 360 mm |
| Diameter shaft shoulderda | — | 14.173 in |
| Diameter of housing shoulderDa | — | 560 mm |
| Diameter of housing shoulderDa | — | 22.047 in |
| Maximum recess radiusra1 max | — | 4 mm |
| Maximum recess radiusra1 max | — | 0.157 in |
| Product characteristics | ||
| Tolerance classPN | — | Normal (ISO 492:2023) |
| Radial internal clearanceCN (Group N) | — | Normal internal clearance |
| Number of rows2 | — | Double-row design |
| Product identity | ||
| Official product category | Cylindrical roller bearings | — |
| Official taxonomy path | /products/rolling-bearings/roller-bearings/cylindrical-roller-bearings/double-row-cylindrical-roller-bearings | — |
| Structure group ID | BC2_001 | — |
| Available from SKF | Yes | — |
| Remanufacturable | Yes | — |
| Product Identity | ||
| Short Description | — | Cylindrical roller bearing |
| Properties | ||
| Bearing part | Complete bearing | — |
| Axial displacement capability | In both directions | — |
| Number of rows | 2 | — |
| Locating feature, bearing outer ring | Without | — |
| Bore type | Cylindrical | — |
| Number of flanges, outer ring | 3 | — |
| Number of flanges, inner ring | 0 | — |
| Loose flange | None | — |
| Radial internal clearance | CN | — |
| Coating | Without | — |
| Relubrication feature | With | — |
| Candidate for remanufacturing | Yes | — |
| Indicative carbon footprint for new product | 966.0 kg CO 2 e | — |
| Indicative carbon footprint for remanufactured product | 321.0 kg CO 2 e | — |
| Technical Data | ||
| Bore Diameter (D) | — | 340 mm |
| Outside Diamater (D) | — | 580 mm |
| Total Width (B) | — | 243 mm |
| Basic Dynamic Load Rating, Radial (Cr) | — | 3,950,000 N |
| Basic Static Load Rating, Radial (C0R) | — | 7,700,000 N |
| Raceway Diameter Inner Ring (F) | — | 402 mm |
| Operating Temperature Min. (Tmin) | — | -30 °C |
| Limiting Speed For Grease Lubrication (Ng Grea) | — | 1,480 1/min |
| Minimum Diameter Shaft Shoulder (Da) | — | 360 mm |
| Limiting Speed (Ng Oil) | — | 1,740 1/min |
| Operating Temperature Max. (Tmax) | — | 150 °C |
| Maximum Diameter Of Housing Shoulder (Da) | — | 560 mm |
| Minimum Chamfer Dimension (R1 Min) | — | 5 mm |
| Shoulder Diameter Outer Ring (D1) | — | 502.5 mm |
| Axial Displacement (S) | — | 10.3 mm |
| Maximum Recess Radius (Ra1 Max) | — | 4 mm |
| Fatigue Load Limit, Radial (Cur) | — | 760,000 N |
| Temperature range | ||
| Operating temperature min.Tmin | — | -30 °C |
| Operating temperature min.Tmin | — | -22 °F |
| Operating temperature max.Tmax | — | 150 °C |
| Operating temperature max.Tmax | — | 302 °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.