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 | 31308 | |
| Bore diameter | d | 40 mm |
| Outside diameter | D | 90 mm |
| Width | B | 50.5 mm |
| Basic dynamic load rating | C | 161 kN |
| Basic static load rating | C0 | 165 kN |
| Fatigue load limit | Pu | 24.7 kN |
| Reference speed | nref | 5100 r/min |
| Limiting speed | nG | 9600 r/min |
| Mass | ≈m | 1.52 kg |
| Precision class | PN — Normal (ISO 492:2023) | |
| Cage | Standard — Sheet steel cage, window cage, roller-guided | |
| Minimum operating temperature | Tmin | -30 °C |
| Maximum operating temperature | Tmax | 120 °C |
Product characteristics7 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Tolerance class | PN | Normal (ISO 492:2023) |
| Heat treatment | Standard | |
| Cage | Standard | Sheet steel cage, window cage, roller-guided |
| Axial internal clearance | A0-35 | Axial internal clearance between 0 and 35 µm |
| Quality level | XL | X-life |
| Matched arrangement | F | X arrangement |
| Number of rows | 2 | Double-row design |
Main Dimensions & Performance Data10 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Bore diameter | d | 40 mm1.575 in |
| Outside diameter | D | 90 mm3.543 in |
| Inner ring total width | 2B | 46 mm1.811 in |
| Outer ring total width | 2T | 50.5 mm1.988 in |
| Basic dynamic load rating, radial | Cr | 161,000 N36,196.043 lbf |
| Basic static load rating, radial | C0r | 165,000 N37,095.324 lbf |
| Fatigue load limit, radial | Cur | 24,700 N5,553.058 lbf |
| Limiting speed | nG | 9,600 1/min |
| Thermal speed rating | nϑr | 5,100 1/min |
| Mass | ≈m | 1.52 kg3.351 lbs |
Mounting dimensions5 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Maximum diameter of shaft shoulder | da max | 51 mm2.008 in |
| Minimum diameter of housing shoulder | Da min | 71 mm2.795 in |
| Maximum diameter of housing shoulder | Da max | 81 mm3.189 in |
| Minimum axial space | Ca min | 4 mm0.157 in |
| Maximum fillet radius of housing | rb max | 1.5 mm0.059 in |
Dimensions2 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Minimum chamfer dimension of outer ring back face | r3, 4 min | 1.5 mm0.059 in |
| Width of spacer | A | 16.5 mm0.65 in |
Temperature range2 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Operating temperature min. | Tmin | -30 °C-22 °F |
| Operating temperature max. | Tmax | 120 °C248 °F |
Calculation factors4 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Limiting value of Fa/Fr for the applicability of diff. Values of factors X and Y | e | 0.83 |
| Dynamic axial load factor | Y1 | 0.82 |
| Dynamic axial load factor | Y2 | 1.22 |
| Static axial load factor | Y0 | 0.8 |
Capabilities & suitability6 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Radial load capacity | Yes | |
| Axial load capacity in one direction | Yes | |
| Axial load capacity in both directions | Yes | |
| Suitable for grease lubrication | Yes | |
| Suitable for oil lubrication | Yes | |
| Unsealed design | Yes |
Manufacturer Identity5 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Schaeffler Product Code | 2271667 | |
| Brand | FAG | |
| Base Type | 31308 | |
| X Life Marking | XL | |
| Base product | 2305091051 |
Product Identity2 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Construction | Tapered roller bearing set 313..-DF, X-arrangement | |
| Short Description | Tapered roller bearing set |
Technical Data22 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Bore Diameter (D) | 40 mm | |
| Outside Diameter (D) | 90 mm | |
| Width Of Bearing Outside (2T) | 50.5 mm | |
| Basic Dynamic Load Rating, Radial (Cr) | 161,000 N | |
| Basic Static Load Rating, Radial (C0R) | 165,000 N | |
| Operating Temperature Min. (Tmin) | -30 °C | |
| Limiting Speed (Ng) | 9,600 1/min | |
| Operating Temperature Max. (Tmax) | 120 °C | |
| Reference Speed (Nϑr) | 5,100 1/min | |
| Maximum Fillet Radius Of Housing (Rb Max) | 1.5 mm | |
| Minimum Chamfer Dimension Of Outer Ring Back Face (R3, 4 M) | 1.5 mm | |
| Minimum Diameter Of Housing Shoulder (Da Min) | 71 mm | |
| Fatigue Load Limit, Radial (Cur) | 24,700 N | |
| Limiting Value Of Fa/Fr For The Applicability Of Diff. Values Of Factors X And Y (E) | 0.83 | |
| Maximum Diameter Of Shaft Shoulder (Da Max) | 51 mm | |
| Dynamic Axial Load Factor (Y1) | 0.82 | |
| Maximum Diameter Of Housing Shoulder (Da Max) | 81 mm | |
| Width Of Spacer (A) | 16.5 mm | |
| Dynamic Axial Load Factor (Y2) | 1.22 | |
| Width Of Bearing Inside (B4) | 46 mm | |
| Minimum Axial Space (Ca Min) | 4 mm | |
| Static Axial Load Factor (Y0) | 0.8 |