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 | 31306 | |
| Bore diameter | d | 30 mm |
| Outside diameter | D | 72 mm |
| Width | B | 20.75 mm |
| Basic dynamic load rating | C | 42.8 kN |
| Basic static load rating | C0 | 46.5 kN |
| Fatigue load limit | Pu | 5.4 kN |
| Reference speed | nref | 6400 r/min |
| Limiting speed | nG | 8240 r/min |
| Mass | ≈m | 0.39277 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 characteristics6 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Tolerance class | PN | Normal (ISO 492:2023) |
| Heat treatment | Standard | |
| Cage | Standard | Sheet steel cage, window cage, roller-guided |
| Internal design | Standard | |
| Quality level | H | |
| Number of rows | 1 | Single-row design |
Main Dimensions & Performance Data11 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Bore diameter | d | 30 mm1.181 in |
| Outside diameter | D | 72 mm2.835 in |
| Width, inner ring | B | 19 mm0.748 in |
| Width, outer ring | C | 14 mm0.551 in |
| Width, total | T | 20.75 mm0.817 in |
| Basic dynamic load rating, radial | Cr | 42,800 N9,622.302 lbf |
| Basic static load rating, radial | C0r | 46,500 N10,454.137 lbf |
| Fatigue load limit, radial | Cur | 5,400 N1,214.029 lbf |
| Limiting speed | nG | 8,240 1/min |
| Thermal speed rating | nϑr | 6,400 1/min |
| Mass | ≈m | 392.77 g13.854 oz |
Mounting dimensions9 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Maximum diameter of shaft shoulder | da max | 40 mm1.575 in |
| Minimum diameter of shaft shoulder | db min | 37 mm1.457 in |
| Minimum diameter of housing shoulder | Da min | 55 mm2.165 in |
| Maximum diameter of housing shoulder | Da max | 65 mm2.559 in |
| Minimum diameter of housing shoulder | Db min | 68 mm2.677 in |
| Minimum axial space | Ca min | 3 mm0.118 in |
| Minimum axial space | Cb min | 6.5 mm0.256 in |
| Maximum fillet radius of shaft | ra max | 1.5 mm0.059 in |
| Maximum fillet radius of housing | rb max | 1.5 mm0.059 in |
Dimensions4 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Minimum chamfer dimension of inner ring back face | r1, 2 min | 1.5 mm0.059 in |
| Minimum chamfer dimension of outer ring back face | r3, 4 min | 1.5 mm0.059 in |
| Distance between the apexes of the pressure cones | a | 24 mm0.945 in |
| Maximum guidance rib diameter of inner ring | d1 max | 55.4 mm2.181 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 | 0.83 |
| Dynamic axial load factor | Y | 0.73 |
| Static axial load factor | Y0 | 0.4 |
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 Identity5 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Schaeffler Product Code | 1858143 | |
| Brand | FAG | |
| Base Type | 31306 | |
| SAP material number | 0957007810000 | |
| Base product | 2305091001 |
Product Identity2 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Construction | Tapered roller bearings 313, main dimensions acc. to DIN 720, separable | |
| Short Description | Tapered roller bearing |
Additional information1 parameter
| Parameter | Symbol | Value |
|---|---|---|
| Comparative designation to ISO 10317 and ISO 355 | T7FB030 |
Technical Data28 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Bore Diameter (D) | 30 mm | |
| Outside Diameter (D) | 72 mm | |
| Width (B) | 20.75 mm | |
| Basic Dynamic Load Rating, Radial (Cr) | 42,800 N | |
| Basic Static Load Rating, Radial (C0R) | 46,500 N | |
| Operating Temperature Min. (Tmin) | -30 °C | |
| Limiting Speed (Ng) | 8,240 1/min | |
| Operating Temperature Max. (Tmax) | 120 °C | |
| Reference Speed (Nϑr) | 6,400 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) | 55 mm | |
| Minimum Diameter Of Housing Shoulder (Db Min) | 68 mm | |
| Width, Outer Ring (C) | 14 mm | |
| Maximum Guidance Rib Diameter Of Inner Ring (D1 Max) | 55.4 mm | |
| Fatigue Load Limit, Radial (Cur) | 5,400 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) | 40 mm | |
| Minimum Diameter Of Shaft Shoulder (Db Min) | 37 mm | |
| Maximum Diameter Of Housing Shoulder (Da Max) | 65 mm | |
| Dynamic Axial Load Factor (Y) | 0.73 | |
| Maximum Fillet Radius (Ra Max) | 1.5 mm | |
| Minimum Axial Space (Cb Min) | 6.5 mm | |
| Minimum Chamfer Dimension Of Inner Ring Back Face (R1, 2 M) | 1.5 mm | |
| Minimum Axial Space (Ca Min) | 3 mm | |
| Width, Inner Ring (B) | 19 mm | |
| Static Axial Load Factor (Y0) | 0.4 | |
| Distance Between The Apexes Of The Pressure Cones (A) | 24 mm |