Fully Keyed Rotary Drive Shaft, Material Carbon Steel Grade 1045, Diameter 5/8 in, Overall Length 18 in, System of Measurement Inch, Diameter Tolerance +/-0.0025 in, End Type Keyed, Keyway Depth 3/32 in, Keyway Length 3/32 in, Keyway Width 3/16 in, Standards ANSI B17.1-1967, ASTM A-108, R1973, Straightness Tolerance 0.012 in/ft, Groove Spacing Not Applicable, Number of Grooves 0