3 LGFP 2 LGET 2 LGHP 2 LGLT 2 LGGB 2 LGEP 2 LGMT 2 Bearing operating parameters Speed for ball bearings EH = Extremely high n d m over 700 000 VH = Very high n dm up to 700 000 H = High n d m up to 500 000 M = Medium n d m up to 300 000 L = Low n dm below 100 000 Temperature L = Low <50 °C (120 °F) M = Medium 50 to 100 °C (120 to 230 °F) H = High >100 °C (210 °F) EH = Extremely .