K81211 NTN Max operating temperature, Tmax 120 °C Thrust roller bearings
| Dc1 | 55 mm |
| Dc | 90 mm |
| Lw | 11 mm |
| Bearing ring (inner ring) WS | WS81211 |
| Bearing ring (outer ring) GS | GS81211 |
| Ea | 83.4 mm |
| Eb | 60.1 mm |
| Cage assembly mass | 0.19 kg |
| Ca | 121 kN |
| C0a | 340 kN |
| Nlim (grease) | 830 rpm |
| Nlim (oil) | 3.300 rpm |
| Min operating temperature, Tmin | -20 °C |
| Max operating temperature, Tmax | 120 °C |
| Characteristic cage frequency, FTF | 0.5 Hz |
| Characteristic rolling element frequency, BSF | 6.52 Hz |
| Characteristic outer ring frequency, BPF0 | 7 Hz |
| Characteristic inner ring frequency, BPFI | 7 Hz |
| Bearing number | K81211 |
| Brand | NTN |
| Bore Diameter (mm) | 55.000 |
| Outer Diameter (mm) | 90.000 |
| d | 55.000 mm |
| D | 90.000 mm |
| Dw | 11.000 mm |
Detailed Parameters
parameter：
| NP198625/NP954445 Tapered roller bearings | Outer Diameter :76.992mm ，Bore Diameter :44.45mm ，Brand:Timken ，Width :17.462mm ，Size :44.45x76.992x17.462mm |
| 53330-MP Thrust ball bearings | Outer Diameter :250mm ，Size :150x250x83.7mm ，Bore Diameter :150mm ，Brand:FAG ，Width :83.7mm |
| PCF45 Bearing units | d:45 mm ，V:116 mm ，P:19.2 mm ，Brand:NKE ，Bore Diameter :45mm |
| MJ 2.1/2 Deep groove ball bearings | Width :31.75mm ，Outer Diameter :139.7mm ，Size :63.5x139.7x31.75mm ，Bore Diameter :63.5mm ，Brand:SIGMA ，d:63.5 mm |
| 21310MBKW33 Spherical roller bearings | Brand:AST ，Outer Diameter :110mm ，Bore Diameter :50mm ，Size :50x110x27mm |
| 61906 Deep groove ball bearings | Size :47x30x9mm ，Brand:SKF ，Bore Diameter :47mm ，Outer Diameter :30mm |
| DKLFA2590-2RS Thrust ball bearings | Size :25x57x38mm ，Bore Diameter :25mm ，Brand:INA ，Width :38mm ，Outer Diameter :57mm |
| TLA 3026 Z Needle roller bearings | Size :30x37x26mm ，Brand:IKO ，Bore Diameter :30mm ，Fw:30 mm ，Outer Diameter :37mm ，Width :26mm |
| 31330 Tapered roller bearings | Outer Diameter :320mm ，Width :82mm ，Bore Diameter :150mm ，Size :150x320x82mm ，Brand:CYSD ，d:150 mm |
| 7922DB Angular contact ball bearings | Brand:NTN ，Outer Diameter :150mm ，Bore Diameter :110mm ，Size :110x150x20mm |
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