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 | K78238-78551 | |
| Bore diameter | d | 60.325 mm |
| Outside diameter | D | 140.03 mm |
| Width | B | 36.513 mm |
| Basic dynamic load rating | C | 166 kN |
| Basic static load rating | C0 | 203 kN |
| Fatigue load limit | Pu | 24.3 kN |
| Reference speed | nref | 4350 r/min |
| Limiting speed | nG | 5100 r/min |
| Mass | ≈m | 2.6 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 | 120 °C |
Product characteristics6 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 |
| Internal design | Standard | |
| Quality level | Standard | |
| Number of rows | 1 | Single-row design |
Main Dimensions & Performance Data11 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Bore diameter | d | 60.325 mm2.375 in |
| Outside diameter | D | 140.03 mm5.513 in |
| Width, inner ring | B | 33.236 mm1.309 in |
| Width, outer ring | C | 23.52 mm0.926 in |
| Width, total | T | 36.513 mm1.438 in |
| Basic dynamic load rating, radial | Cr | 166,000 N37,320.144 lbf |
| Basic static load rating, radial | C0r | 203,000 N45,638.489 lbf |
| Fatigue load limit, radial | Cur | 24,300 N5,463.129 lbf |
| Limiting speed | nG | 5,100 1/min |
| Thermal speed rating | nϑr | 4,350 1/min |
| Mass | ≈m | 2.6 kg5.732 lbs |
Mounting dimensions9 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Maximum diameter of shaft shoulder | da max | 77.5 mm3.051 in |
| Minimum diameter of shaft shoulder | db min | 91 mm3.583 in |
| Minimum diameter of housing shoulder | Da min | 117 mm4.606 in |
| Maximum diameter of housing shoulder | Da max | 130 mm5.118 in |
| Minimum diameter of housing shoulder | Db min | 132.5 mm5.217 in |
| Minimum axial space | Ca min | 4 mm0.157 in |
| Minimum axial space | Cb min | 10 mm0.394 in |
| Maximum fillet radius of shaft | ra max | 5.1 mm0.201 in |
| Maximum fillet radius of housing | rb max | 2.3 mm0.091 in |
Dimensions4 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Minimum chamfer dimension of inner ring back face | r1, 2 min | 5.1 mm0.201 in |
| Minimum chamfer dimension of outer ring back face | r3, 4 min | 2.3 mm0.091 in |
| Distance between the apexes of the pressure cones | a | 45 mm1.772 in |
| Guidance rib diameter of inner ring | d1 | 101.6 mm4 in |
Temperature range2 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Operating temperature min. | Tmin | -30 °C-22 °F |
| Operating temperature max. | Tmax | 120 °C248 °F |
Calculation factors3 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Limiting value of Fa/Fr for the applicability of diff. Values of factors X and Y | e | 0.87 |
| Dynamic axial load factor | Y | 0.69 |
| Static axial load factor | Y0 | 0.38 |
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 | 2267312 | |
| Brand | FAG | |
| Base Type | K78238-78551 | |
| Base product | 2305091001 | |
| Bearing X designation | K78238-C-78551 | |
| Mounting Manager ID | K78238-C-78551 | |
| Grease application ID | K78238-C-78551 |
Product Identity2 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Construction | Tapered roller bearings K-Series, in inch sizes, separable | |
| Short Description | Tapered roller bearing |
Technical Data28 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Bore Diameter (D) | 60.325 mm | |
| Outside Diameter (D) | 140.03 mm | |
| Width (B) | 36.513 mm | |
| Basic Dynamic Load Rating, Radial (Cr) | 166,000 N | |
| Basic Static Load Rating, Radial (C0R) | 203,000 N | |
| Operating Temperature Min. (Tmin) | -30 °C | |
| Limiting Speed (Ng) | 5,100 1/min | |
| Operating Temperature Max. (Tmax) | 120 °C | |
| Reference Speed (Nϑr) | 4,350 1/min | |
| Maximum Fillet Radius Of Housing (Rb Max) | 2.3 mm | |
| Minimum Chamfer Dimension Of Outer Ring Back Face (R3, 4 M) | 2.3 mm | |
| Minimum Diameter Of Housing Shoulder (Da Min) | 117 mm | |
| Minimum Diameter Of Housing Shoulder (Db Min) | 132.5 mm | |
| Width, Outer Ring (C) | 23.52 mm | |
| Fatigue Load Limit, Radial (Cur) | 24,300 N | |
| Limiting Value Of Fa/Fr For The Applicability Of Diff. Values Of Factors X And Y (E) | 0.87 | |
| Maximum Diameter Of Shaft Shoulder (Da Max) | 77.5 mm | |
| Minimum Diameter Of Shaft Shoulder (Db Min) | 91 mm | |
| Maximum Diameter Of Housing Shoulder (Da Max) | 130 mm | |
| Dynamic Axial Load Factor (Y) | 0.69 | |
| Maximum Fillet Radius (Ra Max) | 5.1 mm | |
| Minimum Axial Space (Cb Min) | 10 mm | |
| Minimum Chamfer Dimension Of Inner Ring Back Face (R1, 2 M) | 5.1 mm | |
| Guidance Rib Diameter Of Inner Ring (D1) | 101.6 mm | |
| Minimum Axial Space (Ca Min) | 4 mm | |
| Width, Inner Ring (B) | 33.236 mm | |
| Static Axial Load Factor (Y0) | 0.38 | |
| Distance Between The Apexes Of The Pressure Cones (A) | 45 mm |