Technical data
Product specifications
Metric and imperial values are paired where the manufacturer provides both. Expand a section to review its parameters.
Core specifications9 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Series | K387 | |
| Bore diameter | d | 57.15 mm |
| Basic dynamic load rating | C | 79 kN |
| Basic static load rating | C0 | 101 kN |
| Mass | ≈m | 0.403 kg |
| Precision class | ABMA4 — Class 4 (ANSI/ABMA 19.2:2013) | |
| Cage | Standard — Sheet steel cage, window cage, roller-guided | |
| Minimum operating temperature | Tmin | -30 °C |
| Maximum operating temperature | Tmax | 150 °C |
Product characteristics5 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Tolerance class | ABMA4 | Class 4 (ANSI/ABMA 19.2:2013) |
| Heat treatment | W61B | Carbonitrided |
| Cage | Standard | Sheet steel cage, window cage, roller-guided |
| Quality level | Standard | |
| Number of rows | 1 | Single-row design |
Main Dimensions & Performance Data5 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Bore diameter | d | 57.15 mm2.25 in |
| Width, inner ring | B | 21.946 mm0.864 in |
| Basic dynamic load rating, radial | Cr | 79,000 N17,760.791 lbf |
| Basic static load rating, radial | C0r | 101,000 N22,706.835 lbf |
| Mass | ≈m | 0.403 kg0.888 lbs |
Mounting dimensions5 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Maximum diameter of shaft shoulder | da max | 63 mm2.48 in |
| Minimum diameter of shaft shoulder | db min | 73 mm2.874 in |
| Minimum axial space | CRa min | 3.1 mm0.122 in |
| Maximum axial space | CRb max | 0.1 mm0.004 in |
| Maximum fillet radius of shaft | ra max | 5.2 mm0.205 in |
Dimensions4 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Minimum chamfer dimension of inner ring back face | r1, 2 min | 5.2 mm0.205 in |
| Distance between the apexes of the pressure cones | a | 20 mm0.787 in |
| Outer envelope circle | Ew | 92.943 mm3.659 in |
| Contact angle | α | 13.25 ° |
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 | |
| Axial load capacity in one direction | Yes | |
| Suitable for grease lubrication | Yes | |
| Suitable for oil lubrication | Yes | |
| Unsealed design | Yes |
Manufacturer Identity4 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Schaeffler Product Code | 2485892 | |
| Brand | FAG | |
| Base Type | K387 | |
| Base product | 2305091003 |
Product Identity2 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Construction | Tapered roller bearings without outer ring (Cone) K-Series, in inch sizes | |
| Short Description | Tapered roller bearing |
Technical Data14 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Bore Diameter (D) | 57.15 mm | |
| Basic Dynamic Load Rating, Radial (Cr) | 79,000 N | |
| Basic Static Load Rating, Radial (C0R) | 101,000 N | |
| Operating Temperature Min. (Tmin) | -30 °C | |
| Operating Temperature Max. (Tmax) | 150 °C | |
| Contact Angle (Α) | 13.25 ° | |
| Maximum Diameter Of Shaft Shoulder (Da Max) | 63 mm | |
| Minimum Diameter Of Shaft Shoulder (Db Min) | 73 mm | |
| Maximum Fillet Radius (Ra Max) | 5.2 mm | |
| Maximum Axial Space (Crb Max) | 0.1 mm | |
| Minimum Chamfer Dimension Of Inner Ring Back Face (R1, 2 M) | 5.2 mm | |
| Minimum Axial Space (Cra Min) | 3.1 mm | |
| Width, Inner Ring (B) | 21.946 mm | |
| Distance Between The Apexes Of The Pressure Cones (A) | 20 mm |