Technical data
Product specifications
Metric and imperial values are paired where the manufacturer provides both. Expand a section to review its parameters.
Core specifications14 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Series | K8578-8520 | |
| Bore diameter | d | 241.3 mm |
| Outside diameter | D | 327.025 mm |
| Width | B | 25.401 mm |
| Basic dynamic load rating | C | 490 kN |
| Basic static load rating | C0 | 990 kN |
| Fatigue load limit | Pu | 95 kN |
| Reference speed | nref | 1220 r/min |
| Limiting speed | nG | 2030 r/min |
| Mass | ≈m | 12.957 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 | 200 °C |
Product characteristics5 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Tolerance class | ABMA4 | Class 4 (ANSI/ABMA 19.2:2013) |
| Heat treatment | Standard | |
| Cage | Standard | Sheet steel cage, window cage, roller-guided |
| Quality level | Standard | |
| Number of rows | 1 | Single-row design |
Main Dimensions & Performance Data11 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Bore diameter | d | 241.3 mm9.5 in |
| Outside diameter | D | 327.025 mm12.875 in |
| Width, inner ring | B | 52.388 mm2.063 in |
| Width, outer ring | C | 36.512 mm1.437 in |
| Width assembled flange bearing | TF | 25.401 mm1 in |
| Basic dynamic load rating, radial | Cr | 490,000 N110,161.871 lbf |
| Basic static load rating, radial | C0r | 990,000 N222,571.942 lbf |
| Fatigue load limit, radial | Cur | 95,000 N21,357.914 lbf |
| Limiting speed | nG | 2,030 1/min |
| Thermal speed rating | nϑr | 1,220 1/min |
| Mass | ≈m | 12.957 kg28.565 lbs |
Mounting dimensions8 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Maximum diameter of shaft shoulder | da max | 248 mm9.764 in |
| Minimum diameter of shaft shoulder | db min | 249 mm9.803 in |
| Minimum diameter of housing shoulder | Da min | 305 mm12.008 in |
| Minimum diameter of housing shoulder | Db min | 313 mm12.323 in |
| Minimum axial space | Ca min | 6 mm0.236 in |
| Minimum axial space | Cb min | 12.5 mm0.492 in |
| Maximum fillet radius of shaft | ra max | 6.4 mm0.252 in |
| Maximum fillet radius of housing | rb max | 3.3 mm0.13 in |
Dimensions6 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Minimum chamfer dimension of inner ring back face | r1, 2 min | 6.4 mm0.252 in |
| Minimum chamfer dimension of outer ring back face | r3, 4 min | 3.3 mm0.13 in |
| Distance between the apexes of the pressure cones | a | 59 mm2.323 in |
| Guidance rib diameter of inner ring | d1 | 279.5 mm11.004 in |
| Outside diameter flange | D1 | 336.448 mm13.246 in |
| Width flange | C1 | 9.525 mm0.375 in |
Temperature range2 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Operating temperature min. | Tmin | -30 °C-22 °F |
| Operating temperature max. | Tmax | 200 °C392 °F |
Calculation factors3 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Limiting value of Fa/Fr for the applicability of diff. Values of factors X and Y | e | 0.41 |
| Dynamic axial load factor | Y | 1.48 |
| Static axial load factor | Y0 | 0.81 |
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 Identity7 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Schaeffler Product Code | 2537464 | |
| Brand | FAG | |
| Base Type | K8578-8520 | |
| Base product | 2305091002 | |
| Bearing X designation | K8578-8520-B | |
| Mounting Manager ID | K8578-8520-B | |
| Grease application ID | K8578-8520-B |
Product Identity2 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Construction | Tapered roller bearings with flange K-Series, in inch sizes, separable | |
| Short Description | Tapered roller bearing |
Technical Data36 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Bore Diameter (D) | 241.3 mm | |
| Outside Diameter (D) | 327.025 mm | |
| Width Assembled Flange Bearing (T F) | 25.401 mm | |
| Basic Dynamic Load Rating, Radial (Cr) | 490,000 N | |
| Basic Static Load Rating, Radial (C0R) | 990,000 N | |
| Operating Temperature Min. (Tmin) | -30 °C | |
| Limiting Speed (Ng) | 2,030 1/min | |
| Operating Temperature Max. (Tmax) | 200 °C | |
| Reference Speed (Nϑr) | 1,220 1/min | |
| Maximum Fillet Radius Of Housing (Rb Max) | 3.3 mm | |
| Minimum Chamfer Dimension Of Outer Ring Back Face (R3, 4 M) | 3.3 mm | |
| Minimum Diameter Of Housing Shoulder (Da Min) | 305 mm | |
| Minimum Diameter Of Housing Shoulder (Db Min) | 313 mm | |
| Width, Outer Ring (C) | 36.512 mm | |
| Basic Dynamic Load Rating, Radial (C R) | 490,000 N | |
| Basic Static Load Rating, Radial (C 0R) | 990,000 N | |
| Limiting Speed (N G) | 2,030 1/min | |
| Reference Speed (N Θr) | 1,220 1/min | |
| Fatigue Load Limit, Radial (Cur) | 95,000 N | |
| Limiting Value Of Fa/Fr For The Applicability Of Diff. Values Of Factors X And Y (E) | 0.41 | |
| Maximum Diameter Of Shaft Shoulder (Da Max) | 248 mm | |
| Minimum Diameter Of Shaft Shoulder (Db Min) | 249 mm | |
| Dynamic Axial Load Factor (Y) | 1.48 | |
| Maximum Fillet Radius (Ra Max) | 6.4 mm | |
| Outside Diameter Flange (D1) | 336.448 mm | |
| Minimum Axial Space (Cb Min) | 12.5 mm | |
| Minimum Chamfer Dimension Of Inner Ring Back Face (R1, 2 M) | 6.4 mm | |
| Operating Temperature Max. (T Max) | 200 °C | |
| Width Assembled Flange Bearing (Tf) | 25.401 mm | |
| Guidance Rib Diameter Of Inner Ring (D1) | 279.5 mm | |
| Minimum Axial Space (Ca Min) | 6 mm | |
| Operating Temperature Min. (T Min) | -30 °C | |
| Width Flange (C1) | 9.525 mm | |
| Width, Inner Ring (B) | 52.388 mm | |
| Static Axial Load Factor (Y0) | 0.81 | |
| Distance Between The Apexes Of The Pressure Cones (A) | 59 mm |
