Technical data
Product specifications
Metric and imperial values are paired where the manufacturer provides both. Expand a section to review its parameters.
Core specifications15 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Series | M71918 | |
| Bore diameter | d | 90 mm |
| Outside diameter | D | 125 mm |
| Width | B | 18 mm |
| Basic dynamic load rating | C | 31 kN |
| Basic static load rating | C0 | 20.1 kN |
| Fatigue load limit | Pu | 2.05 kN |
| Limiting speed | nG | 22000 r/min |
| Mass | ≈m | 0.54 kg |
| Precision class | P4S — Tolerance class P4S, FAG standard better than P4 to ISO 492:2023 | |
| Sealing | 2RSD — Non-contact sealed on both sides and greased “for life” | |
| Cage | T — Laminated fabric cage | |
| Lubricant | GA21 — Grease for super precision bearings, standard | |
| Minimum operating temperature | Tmin | -30 °C |
| Maximum operating temperature | Tmax | 80 °C |
Product characteristics7 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Contact angle | E | Contact angle 25° |
| Type of Seal | 2RSD | Non-contact sealed on both sides and greased “for life” |
| Cage | T | Laminated fabric cage |
| Tolerance class | P4S | Tolerance class P4S, FAG standard better than P4 to ISO 492:2023 |
| Arrangement bearing set | U | Single bearing |
| Preload class | L | Preload light |
| Lubricant | GA21 | Grease for super precision bearings, standard |
Main Dimensions & Performance Data9 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Bore diameter | d | 90 mm3.543 in |
| Outside diameter | D | 125 mm4.921 in |
| Width | B | 18 mm0.709 in |
| Basic dynamic load rating, radial | Cr | 31,000 N6,969.424 lbf |
| Basic static load rating, radial | C0r | 20,100 N4,518.885 lbf |
| Fatigue load limit, radial | Cur | 2,050 N460.881 lbf |
| Limiting speed for grease lubrication | nG Grease | 14,000 1/min |
| Limiting speed | nG | 22,000 1/min |
| Mass | ≈m | 0.54 kg1.19 lbs |
Mounting dimensions7 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Diameter shaft shoulder | da | 97 mm3.819 in |
| Diameter shaft shoulder clearance | da | h12 |
| Shoulder diameter outer ring | Da | 119 mm4.685 in |
| Shoulder diameter outer ring clearance | Da | H12 |
| Maximum recess radius | ra max | 0.6 mm0.024 in |
| Maximum recess radius | ra1 max | 0.6 mm0.024 in |
| Distance between the apexes of the pressure cones | a | 34.1 mm1.343 in |
Dimensions3 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Minimum chamfer dimension | rmin | 1.1 mm0.043 in |
| Minimum chamfer dimension | r1 min | 0.6 mm0.024 in |
| Contact angle | α | 25 ° |
Temperature range2 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Operating temperature min. | Tmin | -30 °C-22 °F |
| Operating temperature max. | Tmax | 80 °C176 °F |
Capabilities & suitability5 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Radial load capacity | Yes | |
| Axial load capacity in one direction | Yes | |
| Lifetimelubricationfreedomfrommaintenance | Yes | |
| Suitable for grease lubrication | Yes | |
| Sealedonbothsides | Yes |
Manufacturer Identity8 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Schaeffler Product Code | 820803 | |
| Brand | FAG | |
| Base Type | M71918 | |
| X Life Marking | XL | |
| SAP material number | 0938140110000 | |
| Base product | 2305080313 | |
| Bearing X designation | M71918-E-2RSD-T-P4S-XL | |
| Mounting Manager ID | M71918-E-2RSD-T-P4S-XL |
Product Identity2 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Construction | High speed spindle bearing M719..-E-2RSD, adjusted, in pairs or sets, contact angle α = 25°, lip seals on both sides, non-contact, restricted tolerances | |
| Short Description | High speed spindle bearing |
Additional information9 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Preload force light | FV L | 317 N71.268 lbf |
| Preload force medium | FV M | 832 N187.05 lbf |
| Preload force heavy | FV H | 1,736 N390.288 lbf |
| Lift-off force light | KaE L | 913 N205.261 lbf |
| Lift-off force medium | KaE M | 2,431 N546.538 lbf |
| Lift-off force heavy | KaE H | 5,164 N1,160.971 lbf |
| Axial rigidity light | ca L | 161 N/µm |
| Axial rigidity medium | ca M | 228 N/µm |
| Axial rigidity heavy | ca H | 301 N/µm |
Technical Data27 parameters
| Parameter | Symbol | Value |
|---|---|---|
| Bore Diameter (D) | 90 mm | |
| Outside Diameter (D) | 125 mm | |
| Width (B) | 18 mm | |
| Basic Dynamic Load Rating, Radial (Cr) | 31,000 N | |
| Basic Static Load Rating, Radial (C0R) | 20,100 N | |
| Operating Temperature Min. (Tmin) | -30 °C | |
| Limiting Speed (Ng) | 22,000 1/min | |
| Operating Temperature Max. (Tmax) | 80 °C | |
| Axial Rigidity Heavy (Ca H) | 301 N/µm | |
| Axial Rigidity Light (Ca L) | 161 N/µm | |
| Axial Rigidity Medium (Ca M) | 228 N/µm | |
| Diameter Shaft Shoulder (Da) | 97 mm | |
| Lift Off Force Heavy (Kae H) | 5,164 N | |
| Lift Off Force Light (Kae L) | 913 N | |
| Lift Off Force Medium (Kae M) | 2,431 N | |
| Preload Force Heavy (Fv H) | 1,736 N | |
| Preload Force Light (Fv L) | 317 N | |
| Preload Force Medium (Fv M) | 832 N | |
| Shoulder Diameter Outer Ring (Da) | 119 mm | |
| Limiting Speed For Grease Lubrication (Ng Grea) | 14,000 1/min | |
| Fatigue Load Limit, Radial (Cur) | 2,050 N | |
| Minimum Chamfer Dimension (Rmin) | 1.1 mm | |
| Maximum Fillet Radius (Ra Max) | 0.6 mm | |
| Maximum Recess Radius (Ra1 Max) | 0.6 mm | |
| Minimum Chamfer Dimension (R1 Min) | 0.6 mm | |
| Contact Angle (Α) | 25 ° | |
| Distance Between The Apexes Of The Pressure Cones (A) | 34.1 mm |
