Technical data
Product specifications
Metric and imperial values are paired where the manufacturer provides both. Expand a section to review its parameters.
Core specifications13 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Series | NNU4948 | |
| Bore diameter | d | 240 mm |
| Outside diameter | D | 320 mm |
| Width | B | 80 mm |
| Basic dynamic load rating | C | 530 kN |
| Basic static load rating | C0 | 1210 kN |
| Fatigue load limit | Pu | 138 kN |
| Mass | ≈m | 25.6 kg |
| Precision class | SP — Tolerance class SP | |
| Internal clearance | C1 (Group 1) — Internal clearance smaller than C2 | |
| Cage | M — Brass Cage | |
| Minimum operating temperature | Tmin | -30 °C |
| Maximum operating temperature | Tmax | 150 °C |
Product characteristics6 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Cage | M | Brass Cage |
| Tolerance class | SP | Tolerance class SP |
| Bore type | K | Tapered, taper 1:12 |
| Locating Feature , bearing outer ring | S | Lubrication holes and lubrication groove in outer ring |
| Radial internal clearance | C1 (Group 1) | Internal clearance smaller than C2 |
| Number of rows | 2 | Double-row design |
Main Dimensions & Performance Data9 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Bore diameter | d | 240 mm9.449 in |
| Outside diameter | D | 320 mm12.598 in |
| Width | B | 80 mm3.15 in |
| Basic dynamic load rating, radial | Cr | 530,000 N119,154.676 lbf |
| Basic static load rating, radial | C0r | 1,210,000 N272,032.374 lbf |
| Fatigue load limit, radial | Cur | 138,000 N31,025.18 lbf |
| Limiting speed for grease lubrication | nG Grease | 2,400 1/min |
| Limiting speed for oil lubrication | nG Oil | 2,800 1/min |
| Mass | ≈m | 25.6 kg56.438 lbs |
Mounting dimensions5 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Diameter shaft shoulder | da | 263 mm10.354 in |
| Diameter shaft shoulder tolerance | h12 | |
| Diameter of housing shoulder | Da | 299 mm11.772 in |
| Diameter of housing shoulder tolerance | H12 | |
| Maximum recess radius | ra1 max | 2.1 mm0.083 in |
Dimensions5 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Minimum chamfer dimension | r1 min | 2.1 mm0.083 in |
| Raceway diameter inner ring | F | 265 mm10.433 in |
| Width of lubricating groove | ns | 12.2 mm0.48 in |
| Diameter lubrication hole | ds | 6.3 mm0.248 in |
| Axial displacement | s | 4.3 mm0.169 in |
Temperature range2 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Operating temperature min. | Tmin | -30 °C-22 °F |
| Operating temperature max. | Tmax | 150 °C302 °F |
Capabilities & suitability5 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Radial load capacity | Yes | |
| Suitable for grease lubrication | Yes | |
| Suitable for oil lubrication | Yes | |
| Unsealed design | Yes | |
| Largebearing | Yes |
Manufacturer Identity7 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Schaeffler Product Code | 374672 | |
| Brand | FAG | |
| Base Type | NNU4948 | |
| SAP material number | 0192335740000 | |
| Base product | 230509014C | |
| Bearing X designation | NNU4948-S-K-M-SP | |
| Mounting Manager ID | NNU4948-S-K-M-SP |
Product Identity2 parameters
| Parameter | Symbol | Value |
|---|---|---|
| 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 |
Technical Data18 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Bore Diameter (D) | 240 mm | |
| Outside Diamater (D) | 320 mm | |
| Total Width (B) | 80 mm | |
| Basic Dynamic Load Rating, Radial (Cr) | 530,000 N | |
| Basic Static Load Rating, Radial (C0R) | 1,210,000 N | |
| Diameter Lubrication Hole (Ds) | 6.3 mm | |
| Raceway Diameter Inner Ring (F) | 265 mm | |
| Operating Temperature Min. (Tmin) | -30 °C | |
| Limiting Speed For Grease Lubrication (Ng Grea) | 2,400 1/min | |
| Minimum Diameter Shaft Shoulder (Da) | 263 mm | |
| Limiting Speed (Ng Oil) | 2,800 1/min | |
| Operating Temperature Max. (Tmax) | 150 °C | |
| Maximum Diameter Of Housing Shoulder (Da) | 299 mm | |
| Minimum Chamfer Dimension (R1 Min) | 2.1 mm | |
| Width Of Lubricating Groove (Ns) | 12.2 mm | |
| Axial Displacement (S) | 4.3 mm | |
| Maximum Recess Radius (Ra1 Max) | 2.1 mm | |
| Fatigue Load Limit, Radial (Cur) | 138,000 N |
