Cross-brand designation analysis
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“NNU4952” across 3 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 | SKFNNU 4952 BK/SPW33260 × 360 × 100 mm | FAGNNU4952-S-K-M-SP260 × 360 × 100 mm | KOYONNU4952260 × 360 × 100 mm |
|---|---|---|---|
| Comparable specifications | |||
| Brand | SKF | FAG | KOYO |
| Designation | NNU 4952 BK/SPW33 | NNU4952-S-K-M-SP | NNU4952 |
| Product family | Super-precision cylindrical roller bearings | — | Single-row / NNU / Cylindrical bore |
| Detailed type | Super-precision double row cylindrical roller bearing with tapered bore and lubrication feature | Cylindrical roller bearings | Cylindrical roller bearings |
| Series | — | NNU4952 | — |
| Bore diameterd | 260 mm | 260 mm | 260 mm |
| Outside diameterD | 360 mm | 360 mm | 360 mm |
| WidthB | 100 mm | 100 mm | 100 mm |
| Basic dynamic load ratingC | 748 kN | 750 kN | 1180 kN |
| Basic static load ratingC0 | 1700 kN | 1690 kN | 2050 kN |
| Fatigue load limitPu | 163 kN | 190 kN | 228 kN |
| Limiting speednG | — | — | 1400 r/min |
| Mass≈m | 30.4 kg | 40 kg | 31.4 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 | — | 292 mm | — |
| Raceway diameter inner ringF | — | 11.496 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. 271 mm | — | — |
| Abutment diameter shaft (NNU design)d a | max. 288 mm | — | — |
| Abutment diameter housingD a | max. 349 mm | — | — |
| Fillet radiusr a | max. 2 mm | — | — |
| Oil nozzle position (not for variants with TNHA cage)d n | 294.5 mm | — | — |
| Engineering — Calculation data | |||
| Attainable speed for grease lubrication | 2000.0 r/min | — | — |
| Attainable speed for oil-air lubrication | 2400.0 r/min | — | — |
| Reference grease quantityG ref | 366 cm³ | — | — |
| Static radial stiffness (guideline value) | 6830 N/µm | — | — |
| Engineering — Dimensions | |||
| Shoulder diameter outer ring (NNU design)D 1 | 325.6 mm | — | — |
| Raceway diameter inner ring (NNU design)F | 292 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. 1.1 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 | Tapered 1:12 | — | — |
| Logistics | |||
| Product net weight | 30.4 kg | — | — |
| eClass code | 23-05-09-01 | — | — |
| UNSPSC code | 31171505 | — | — |
| Main Dimensions & Performance Data | |||
| Basic dynamic load rating, radialCr | — | 750,000 N | — |
| Basic dynamic load rating, radialCr | — | 168,615.108 lbf | — |
| Basic static load rating, radialC0r | — | 1,690,000 N | — |
| Basic static load rating, radialC0r | — | 379,946.043 lbf | — |
| Fatigue load limit, radialCur | — | 190,000 N | — |
| Fatigue load limit, radialCur | — | 42,715.827 lbf | — |
| Limiting speed for grease lubricationnG Grease | — | 2,070 1/min | — |
| Limiting speed for oil lubricationnG Oil | — | 2,430 1/min | — |
| Manufacturer Identity | |||
| Schaeffler Product Code | — | 374520 | — |
| Official Class Key | — | — | 040-020-020 |
| Base Type | — | NNU4952 | — |
| Old Designation | — | ["NNU4952SK.M.SP"] | — |
| Gpsd Group | — | F07 | — |
| Product Line Id | — | 39 | — |
| X Life Marking | — | n.r. | — |
| SAP material number | — | 0192336630000 | — |
| Base product | — | 230509014C | — |
| Bearing X designation | — | NNU4952-S-K-M-SP | — |
| Mounting Manager ID | — | NNU4952-S-K-M-SP | — |
| Mounting dimensions | |||
| Diameter shaft shoulderda | — | 289.4 mm | — |
| Diameter shaft shoulderda | — | 11.394 in | — |
| Diameter shaft shoulder tolerance | — | h12 | — |
| Diameter of housing shoulderDa | — | 334 mm | — |
| Diameter of housing shoulderDa | — | 13.15 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 | 113.0 kg CO 2 e | — | — |
| Technical Data | |||
| d | — | — | 360 mm |
| B | — | — | 100 mm |
| R(Min.) | — | — | 2.1 mm |
| Fw | — | — | 287 mm |
| Bore Diameter (D) | — | 260 mm | — |
| Ew | — | — | - mm |
| Outside Diamater (D) | — | 360 mm | — |
| Basic Load Ratings : Cr | — | — | 1180 kN |
| Total Width (B) | — | 100 mm | — |
| Basic Load Ratings : C0R | — | — | 2050 kN |
| Basic Dynamic Load Rating, Radial (Cr) | — | 750,000 N | — |
| Fatigue Load Limit : Cu | — | — | 228 kN |
| Basic Static Load Rating, Radial (C0R) | — | 1,690,000 N | — |
| Limiting Speeds(Grease Lub.) | — | — | 1400 min-1 |
| Diameter Lubrication Hole (Ds) | — | 8 mm | — |
| Limiting Speeds(Oil Lub.) | — | — | 1700 min-1 |
| Raceway Diameter Inner Ring (F) | — | 292 mm | — |
| Da(Min.) | — | — | - mm |
| Operating Temperature Min. (Tmin) | — | -30 °C | — |
| Da(Max.) | — | — | 349 mm |
| Limiting Speed For Grease Lubrication (Ng Grea) | — | 2,070 1/min | — |
| Db(Min.) | — | — | 296 mm |
| Minimum Diameter Shaft Shoulder (Da) | — | 289.4 mm | — |
| Limiting Speed (Ng Oil) | — | 2,430 1/min | — |
| Ra(Max.) | — | — | 2 mm |
| Operating Temperature Max. (Tmax) | — | 150 °C | — |
| Mass(Refer.) | — | — | 31.4 kg |
| Maximum Diameter Of Housing Shoulder (Da) | — | 334 mm | — |
| Minimum Chamfer Dimension (R1 Min) | — | 2.1 mm | — |
| 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) | — | 190,000 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 | — |
Automatic matching is a search aid, not an interchangeability declaration. Confirm the full suffix, tolerances, internal design and application limits before substitution.