Cross-brand designation analysis
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“NNU4938” 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 4938 B/SPW33190 × 260 × 69 mm | FAGNNU4938-S-K-M-SP190 × 260 × 69 mm | KOYONNU4938190 × 260 × 69 mm |
|---|---|---|---|
| Comparable specifications | |||
| Brand | SKF | FAG | KOYO |
| Designation | NNU 4938 B/SPW33 | NNU4938-S-K-M-SP | NNU4938 |
| 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 | — | NNU4938 | — |
| Bore diameterd | 190 mm | 190 mm | 190 mm |
| Outside diameterD | 260 mm | 260 mm | 260 mm |
| WidthB | 69 mm | 69 mm | 69 mm |
| Basic dynamic load ratingC | 402 kN | 410 kN | 581 kN |
| Basic static load ratingC0 | 880 kN | 880 kN | 996 kN |
| Fatigue load limitPu | 90 kN | 106 kN | 119 kN |
| Limiting speednG | — | — | 2000 r/min |
| Mass≈m | 11.2 kg | 11.375 kg | 11 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 | — |
| 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 mm | — |
| Minimum chamfer dimensionr1 min | — | 0.079 in | — |
| Raceway diameter inner ringF | — | 212 mm | — |
| Raceway diameter inner ringF | — | 8.346 in | — |
| Width of lubricating groovens | — | 9.5 mm | — |
| Width of lubricating groovens | — | 0.374 in | — |
| Diameter lubrication holeds | — | 4.8 mm | — |
| Diameter lubrication holeds | — | 0.189 in | — |
| Axial displacements | — | 3.2 mm | — |
| Axial displacements | — | 0.126 in | — |
| Engineering — Abutment dimensions | |||
| Abutment diameter shaftd a | min. 200 mm | — | — |
| Abutment diameter shaft (NNU design)d a | max. 209 mm | — | — |
| Abutment diameter shaft (NNU design; not for tapered bore)d b | min. 215 mm | — | — |
| Abutment diameter housingD a | max. 250 mm | — | — |
| Fillet radiusr a | max. 2 mm | — | — |
| Oil nozzle position (not for variants with TNHA cage)d n | 213 mm | — | — |
| Engineering — Calculation data | |||
| Attainable speed for grease lubrication | 2800.0 r/min | — | — |
| Attainable speed for oil-air lubrication | 3200.0 r/min | — | — |
| Reference grease quantityG ref | 85 cm³ | — | — |
| Static radial stiffness (guideline value) | 5380 N/µm | — | — |
| Engineering — Dimensions | |||
| Shoulder diameter outer ring (NNU design)D 1 | 236 mm | — | — |
| Raceway diameter inner ring (NNU design)F | 212 mm | — | — |
| Width annular lubrication groove at outer ringb | 8.3 mm | — | — |
| Diameter lubrication hole (outer ring)K | 3 mm | — | — |
| Chamfer dimension outer ringr 1,2 | min. 2 mm | — | — |
| Chamfer dimension inner ring (bearing with tapered bore)r 3,4 | min. 2 mm | — | — |
| Permissible axial displacement from the normal position of one bearing ring relative to the other (all)s | max. 1.1 mm | — | — |
| Engineering — Engineering specifications | |||
| Bore type | Cylindrical | — | — |
| Logistics | |||
| Product net weight | 11.2 kg | — | — |
| eClass code | 23-05-09-01 | — | — |
| UNSPSC code | 31171505 | — | — |
| Main Dimensions & Performance Data | |||
| Basic dynamic load rating, radialCr | — | 410,000 N | — |
| Basic dynamic load rating, radialCr | — | 92,176.259 lbf | — |
| Basic static load rating, radialC0r | — | 880,000 N | — |
| Basic static load rating, radialC0r | — | 197,841.727 lbf | — |
| Fatigue load limit, radialCur | — | 106,000 N | — |
| Fatigue load limit, radialCur | — | 23,830.935 lbf | — |
| Limiting speed for grease lubricationnG Grease | — | 2,900 1/min | — |
| Limiting speed for oil lubricationnG Oil | — | 3,450 1/min | — |
| Manufacturer Identity | |||
| Schaeffler Product Code | — | 374661 | — |
| Official Class Key | — | — | 040-020-020 |
| Base Type | — | NNU4938 | — |
| Gpsd Group | — | F07 | — |
| Product Line Id | — | 39 | — |
| SAP material number | — | 0192333450000 | — |
| Base product | — | 230509014C | — |
| Bearing X designation | — | NNU4938-S-K-M-SP | — |
| Mounting Manager ID | — | NNU4938-S-K-M-SP | — |
| Mounting dimensions | |||
| Diameter shaft shoulderda | — | 210.5 mm | — |
| Diameter shaft shoulderda | — | 8.287 in | — |
| Diameter shaft shoulder tolerance | — | h12 | — |
| Diameter of housing shoulderDa | — | 242 mm | — |
| Diameter of housing shoulderDa | — | 9.528 in | — |
| Diameter of housing shoulder tolerance | — | H12 | — |
| Maximum recess radiusra1 max | — | 2 mm | — |
| Maximum recess radiusra1 max | — | 0.079 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 | 41.6 kg CO 2 e | — | — |
| Technical Data | |||
| d | — | — | 260 mm |
| B | — | — | 69 mm |
| Bore Diameter (D) | — | 190 mm | — |
| R(Min.) | — | — | 2 mm |
| Outside Diamater (D) | — | 260 mm | — |
| Fw | — | — | 210 mm |
| Total Width (B) | — | 69 mm | — |
| Ew | — | — | - mm |
| Basic Dynamic Load Rating, Radial (Cr) | — | 410,000 N | — |
| Basic Load Ratings : Cr | — | — | 581 kN |
| Basic Static Load Rating, Radial (C0R) | — | 880,000 N | — |
| Basic Load Ratings : C0R | — | — | 996 kN |
| Diameter Lubrication Hole (Ds) | — | 4.8 mm | — |
| Fatigue Load Limit : Cu | — | — | 119 kN |
| Raceway Diameter Inner Ring (F) | — | 212 mm | — |
| Limiting Speeds(Grease Lub.) | — | — | 2000 min-1 |
| Operating Temperature Min. (Tmin) | — | -30 °C | — |
| Limiting Speeds(Oil Lub.) | — | — | 2400 min-1 |
| Limiting Speed For Grease Lubrication (Ng Grea) | — | 2,900 1/min | — |
| Da(Min.) | — | — | - mm |
| Minimum Diameter Shaft Shoulder (Da) | — | 210.5 mm | — |
| Da(Max.) | — | — | 251 mm |
| Limiting Speed (Ng Oil) | — | 3,450 1/min | — |
| Db(Min.) | — | — | 215 mm |
| Operating Temperature Max. (Tmax) | — | 150 °C | — |
| Maximum Diameter Of Housing Shoulder (Da) | — | 242 mm | — |
| Ra(Max.) | — | — | 2 mm |
| Minimum Chamfer Dimension (R1 Min) | — | 2 mm | — |
| Mass(Refer.) | — | — | 11.0 kg |
| Width Of Lubricating Groove (Ns) | — | 9.5 mm | — |
| Axial Displacement (S) | — | 3.2 mm | — |
| Maximum Recess Radius (Ra1 Max) | — | 2 mm | — |
| Fatigue Load Limit, Radial (Cur) | — | 106,000 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.