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| Parameter | SKFNNU 4956 B/SPW33280 × 380 × 100 mm | FAGNNU4956-S-K-M-SP280 × 380 × 100 mm | KOYONNU4956280 × 380 × 100 mm |
|---|---|---|---|
| Comparable specifications | |||
| Brand | SKF | FAG | KOYO |
| Designation | NNU 4956 B/SPW33 | NNU4956-S-K-M-SP | NNU4956 |
| Product family | Super-precision cylindrical roller bearings | — | Single-row / NNU / Cylindrical bore |
| Detailed type | Super-precision double row cylindrical roller bearing with lubrication feature | Cylindrical roller bearings | Cylindrical roller bearings |
| Series | — | NNU4956 | — |
| Bore diameterd | 280 mm | 280 mm | 280 mm |
| Outside diameterD | 380 mm | 380 mm | 380 mm |
| WidthB | 100 mm | 100 mm | 100 mm |
| Basic dynamic load ratingC | 765 kN | 770 kN | 1220 kN |
| Basic static load ratingC0 | 1800 kN | 1790 kN | 2200 kN |
| Fatigue load limitPu | 170 kN | 198 kN | 239 kN |
| Limiting speednG | — | — | 1300 r/min |
| Mass≈m | 32.8 kg | 44 kg | 33.1 kg |
| Precision class | — | SP — Tolerance class SP | — |
| Internal clearance | C1 | C1 (Group 1) — Internal clearance smaller than C2 | — |
| Sealing | Without | — | — |
| Cage | Machined metal | M — Brass Cage | — |
| Bearing material | Bearing steel | — | — |
| Lubricant | None | — | — |
| Minimum operating temperatureTmin | — | -30 °C | — |
| Maximum operating temperatureTmax | — | 150 °C | — |
| Capabilities & suitability | |||
| Radial load capacity | — | Yes | — |
| Suitable for grease lubrication | — | Yes | — |
| Suitable for oil lubrication | — | Yes | — |
| Unsealed design | — | Yes | — |
| Largebearing | — | Yes | — |
| Classification | |||
| Official Category Path | — | — | Cylindrical roller bearings - Single-row - NNU - Cylindrical bore |
| Official Classification 1 | — | — | Cylindrical roller bearings / Single-row / NNU / Cylindrical bore |
| Dimensions | |||
| Minimum chamfer dimensionr1 min | — | 2.1 mm | — |
| Minimum chamfer dimensionr1 min | — | 0.083 in | — |
| Raceway diameter inner ringF | — | 312 mm | — |
| Raceway diameter inner ringF | — | 12.283 in | — |
| Width of lubricating groovens | — | 15 mm | — |
| Width of lubricating groovens | — | 0.591 in | — |
| Diameter lubrication holeds | — | 8 mm | — |
| Diameter lubrication holeds | — | 0.315 in | — |
| Axial displacements | — | 5.4 mm | — |
| Axial displacements | — | 0.213 in | — |
| Engineering — Abutment dimensions | |||
| Abutment diameter shaftd a | min. 291 mm | — | — |
| Abutment diameter shaft (NNU design)d a | max. 308 mm | — | — |
| Abutment diameter shaft (NNU design; not for tapered bore)d b | min. 316 mm | — | — |
| Abutment diameter housingD a | max. 369 mm | — | — |
| Fillet radiusr a | max. 2 mm | — | — |
| Oil nozzle position (not for variants with TNHA cage)d n | 313.5 mm | — | — |
| Engineering — Calculation data | |||
| Attainable speed for grease lubrication | 1900.0 r/min | — | — |
| Attainable speed for oil-air lubrication | 2200.0 r/min | — | — |
| Reference grease quantityG ref | 384 cm³ | — | — |
| Static radial stiffness (guideline value) | 7260 N/µm | — | — |
| Engineering — Dimensions | |||
| Shoulder diameter outer ring (NNU design)D 1 | 345.6 mm | — | — |
| Raceway diameter inner ring (NNU design)F | 312 mm | — | — |
| Width annular lubrication groove at outer ringb | 13.9 mm | — | — |
| Diameter lubrication hole (outer ring)K | 3 mm | — | — |
| Chamfer dimension outer ringr 1,2 | min. 2.1 mm | — | — |
| Chamfer dimension inner ring (bearing with tapered bore)r 3,4 | min. 2.1 mm | — | — |
| Permissible axial displacement from the normal position of one bearing ring relative to the other (all)s | max. 4.5 mm | — | — |
| Engineering — Engineering specifications | |||
| Bore type | Cylindrical | — | — |
| Logistics | |||
| Product net weight | 32.8 kg | — | — |
| eClass code | 23-05-09-01 | — | — |
| UNSPSC code | 31171505 | — | — |
| Main Dimensions & Performance Data | |||
| Basic dynamic load rating, radialCr | — | 770,000 N | — |
| Basic dynamic load rating, radialCr | — | 173,111.511 lbf | — |
| Basic static load rating, radialC0r | — | 1,790,000 N | — |
| Basic static load rating, radialC0r | — | 402,428.058 lbf | — |
| Fatigue load limit, radialCur | — | 198,000 N | — |
| Fatigue load limit, radialCur | — | 44,514.388 lbf | — |
| Limiting speed for grease lubricationnG Grease | — | 1,970 1/min | — |
| Limiting speed for oil lubricationnG Oil | — | 2,320 1/min | — |
| Manufacturer Identity | |||
| Schaeffler Product Code | — | 374678 | — |
| Official Class Key | — | — | 040-020-020 |
| Base Type | — | NNU4956 | — |
| Gpsd Group | — | F07 | — |
| Product Line Id | — | 39 | — |
| SAP material number | — | 0192337600000 | — |
| Base product | — | 230509014C | — |
| Bearing X designation | — | NNU4956-S-K-M-SP | — |
| Mounting Manager ID | — | NNU4956-S-K-M-SP | — |
| Mounting dimensions | |||
| Diameter shaft shoulderda | — | 309.4 mm | — |
| Diameter shaft shoulderda | — | 12.181 in | — |
| Diameter shaft shoulder tolerance | — | h12 | — |
| Diameter of housing shoulderDa | — | 354 mm | — |
| Diameter of housing shoulderDa | — | 13.937 in | — |
| Diameter of housing shoulder tolerance | — | H12 | — |
| Maximum recess radiusra1 max | — | 2.1 mm | — |
| Maximum recess radiusra1 max | — | 0.083 in | — |
| Product characteristics | |||
| Tolerance classSP | — | Tolerance class SP | — |
| Bore typeK | — | Tapered, taper 1:12 | — |
| Locating Feature , bearing outer ringS | — | Lubrication holes and lubrication groove in outer ring | — |
| Radial internal clearanceC1 (Group 1) | — | Internal clearance smaller than C2 | — |
| Number of rows2 | — | Double-row design | — |
| Product identity | |||
| Official product category | Super-precision cylindrical roller bearings | — | — |
| Official taxonomy path | /products/super-precision-bearings/cylindrical-roller-bearings | — | — |
| Structure group ID | BC2_010 | — | — |
| Available from SKF | Yes | — | — |
| Remanufacturable | No | — | — |
| Product Identity | |||
| Construction | — | Super precision cylindrical roller bearings NNU49..-S-K-M-SP, non-locating bearing, double row, with tapered bore, taper 1:12, separable, with cage | — |
| Short Description | — | Cylindrical roller bearing | — |
| Properties | |||
| Bearing part | Complete bearing | — | — |
| Number of rows | 2 | — | — |
| Design | NNU | — | — |
| Number of flanges, outer ring | 3 | — | — |
| Number of flanges, inner ring | 0 | — | — |
| Loose flange | None | — | — |
| Radial internal clearance | C1 | — | — |
| Tolerance class | Class SP (SP) | — | — |
| Material, bearing | Bearing steel | — | — |
| Coating | Without | — | — |
| Relubrication feature | Annular groove and lubrication holes | — | — |
| Indicative carbon footprint for new product | 121.0 kg CO 2 e | — | — |
| Technical Data | |||
| d | — | — | 380 mm |
| B | — | — | 100 mm |
| Bore Diameter (D) | — | 280 mm | — |
| R(Min.) | — | — | 2.1 mm |
| Outside Diamater (D) | — | 380 mm | — |
| Fw | — | — | 308 mm |
| Total Width (B) | — | 100 mm | — |
| Ew | — | — | - mm |
| Basic Dynamic Load Rating, Radial (Cr) | — | 770,000 N | — |
| Basic Load Ratings : Cr | — | — | 1220 kN |
| Basic Static Load Rating, Radial (C0R) | — | 1,790,000 N | — |
| Basic Load Ratings : C0R | — | — | 2200 kN |
| Diameter Lubrication Hole (Ds) | — | 8 mm | — |
| Fatigue Load Limit : Cu | — | — | 239 kN |
| Raceway Diameter Inner Ring (F) | — | 312 mm | — |
| Limiting Speeds(Grease Lub.) | — | — | 1300 min-1 |
| Operating Temperature Min. (Tmin) | — | -30 °C | — |
| Limiting Speeds(Oil Lub.) | — | — | 1500 min-1 |
| Limiting Speed For Grease Lubrication (Ng Grea) | — | 1,970 1/min | — |
| Da(Min.) | — | — | - mm |
| Minimum Diameter Shaft Shoulder (Da) | — | 309.4 mm | — |
| Da(Max.) | — | — | 369 mm |
| Limiting Speed (Ng Oil) | — | 2,320 1/min | — |
| Db(Min.) | — | — | 316 mm |
| Operating Temperature Max. (Tmax) | — | 150 °C | — |
| Maximum Diameter Of Housing Shoulder (Da) | — | 354 mm | — |
| Ra(Max.) | — | — | 2 mm |
| Minimum Chamfer Dimension (R1 Min) | — | 2.1 mm | — |
| Mass(Refer.) | — | — | 33.1 kg |
| Width Of Lubricating Groove (Ns) | — | 15 mm | — |
| Axial Displacement (S) | — | 5.4 mm | — |
| Maximum Recess Radius (Ra1 Max) | — | 2.1 mm | — |
| Fatigue Load Limit, Radial (Cur) | — | 198,000 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.