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 | NNU4921 | |
| Bore diameter | d | 105 mm |
| Outside diameter | D | 145 mm |
| Width | B | 40 mm |
| Basic dynamic load rating | C | 130 kN |
| Basic static load rating | C0 | 260 kN |
| Fatigue load limit | Pu | 34.5 kN |
| Mass | ≈m | 1.95 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 | 105 mm4.134 in |
| Outside diameter | D | 145 mm5.709 in |
| Width | B | 40 mm1.575 in |
| Basic dynamic load rating, radial | Cr | 130,000 N29,226.619 lbf |
| Basic static load rating, radial | C0r | 260,000 N58,453.237 lbf |
| Fatigue load limit, radial | Cur | 34,500 N7,756.295 lbf |
| Limiting speed for grease lubrication | nG Grease | 5,500 1/min |
| Limiting speed for oil lubrication | nG Oil | 6,500 1/min |
| Mass | ≈m | 1.95 kg4.299 lbs |
Mounting dimensions5 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Diameter shaft shoulder | da | 117 mm4.606 in |
| Diameter shaft shoulder tolerance | h12 | |
| Diameter of housing shoulder | Da | 134 mm5.276 in |
| Diameter of housing shoulder tolerance | H12 | |
| Maximum recess radius | ra1 max | 1 mm0.039 in |
Dimensions5 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Minimum chamfer dimension | r1 min | 1.1 mm0.043 in |
| Raceway diameter inner ring | F | 118 mm4.646 in |
| Width of lubricating groove | ns | 6.5 mm0.256 in |
| Diameter lubrication hole | ds | 3.2 mm0.126 in |
| Axial displacement | s | 2 mm0.079 in |
Temperature range2 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Operating temperature min. | Tmin | -30 °C-22 °F |
| Operating temperature max. | Tmax | 150 °C302 °F |
Capabilities & suitability4 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Radial load capacity | Yes | |
| Suitable for grease lubrication | Yes | |
| Suitable for oil lubrication | Yes | |
| Unsealed design | Yes |
Manufacturer Identity9 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Schaeffler Product Code | 374500 | |
| Brand | FAG | |
| Base Type | NNU4921 | |
| Old Designation | ["NNU4921SK.M.SP"] | |
| X Life Marking | n.r. | |
| SAP material number | 0192328100000 | |
| Base product | 230509014C | |
| Bearing X designation | NNU4921-S-K-M-SP | |
| Mounting Manager ID | NNU4921-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) | 105 mm | |
| Outside Diamater (D) | 145 mm | |
| Total Width (B) | 40 mm | |
| Basic Dynamic Load Rating, Radial (Cr) | 130,000 N | |
| Basic Static Load Rating, Radial (C0R) | 260,000 N | |
| Diameter Lubrication Hole (Ds) | 3.2 mm | |
| Raceway Diameter Inner Ring (F) | 118 mm | |
| Operating Temperature Min. (Tmin) | -30 °C | |
| Limiting Speed For Grease Lubrication (Ng Grea) | 5,500 1/min | |
| Minimum Diameter Shaft Shoulder (Da) | 117 mm | |
| Limiting Speed (Ng Oil) | 6,500 1/min | |
| Operating Temperature Max. (Tmax) | 150 °C | |
| Maximum Diameter Of Housing Shoulder (Da) | 134 mm | |
| Minimum Chamfer Dimension (R1 Min) | 1.1 mm | |
| Width Of Lubricating Groove (Ns) | 6.5 mm | |
| Axial Displacement (S) | 2 mm | |
| Maximum Recess Radius (Ra1 Max) | 1 mm | |
| Fatigue Load Limit, Radial (Cur) | 34,500 N |
