Needle Roller Bearing, Bearing Industry Number 55, Bearing Design J, Bore Diameter 5/16 in, Cage Material Steel, Closure Open, Full Complement No, Lubricant Material Grease, Oil, Maximum Speed 18,000 RPM Grease, 28,000 RPM Oil, Maximum Temperature 248 Degrees F, Minimum Temperature -22 Degrees F, Needle Bearing Type Drawn Cup Needle Roller Bearing, Number of Rows One, Outside Diameter 1/2 in, Overall Width 0.313 in, Ring Material Alloy Steel, Roller Material Alloy Steel, Seal Type Not Applicable