Needle Roller Bearing Bearing Industry Number 59 Bearing Design JTT Bore Diameter 5/16 in Cage Material Steel Closure Double Sealed Full Complement No Lubricant Material Grease Oil Maximum Speed 18 000 RPM Grease 28 000 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 1/2 in Overall Width 0.563 in Ring Material Alloy Steel Roller Material Alloy Steel