Keyed Shaft, Material Carbon Steel Grade 1045, Diameter 8 mm, Overall Length 300 mm, System of Measurement Metric, Diameter Tolerance -0.0005/-0.0025, End Type Keyed, Keyway Depth 1 13/64 mm, Keyway Length 300 mm, Keyway Width 2 mm, Standards ANSI B17.1-1967, ASTM A-108, R1973, Straightness Tolerance 0.012 in/ft, Groove Spacing Not Applicable, Number of Grooves 0