Linear Shaft, System of Measurement Inch, Diameter 3/4 in, Shaft Type Both Ends Tapped Shaft, End Type Both Ends Tapped, Core Type Solid, Overall Length 18 in, Surface Hardness - Minimum 60 HRC, Material Carbon Steel, End Thread Size 5/16-18, Mounting Hole Thread Size Not Applicable, Diameter Tolerance - Minimum 0.749 in, Diameter Tolerance - Maximum 0.75 in, Mounting Hole Center to Center Not Applicable, Mounting Hole Center to Shaft End Not Applicable, End Thread Length 0.625 in