Needle Roller Bearing Bearing Industry Number 57 Bearing Design JH Bore Diameter 5/16 in Cage Material Steel Closure Open Full Complement No Lubricant Material Grease Oil Maximum Speed 14 000 RPM Grease 22 000 RPM Oil Maximum Temperature 250 Degrees F Minimum Temperature -5 Degrees F Needle Bearing Type Drawn Cup Needle Roller Bearing Number of Rows One Outside Diameter 9/16 in Overall Width 0.438 in Ring Material Alloy Steel Roller Material Alloy Steel