' Woodruff Key, Half Moon, C-1035 Steel, Plain, Key Size 5/16 x 1 1/4 In, Length 1.250 In, Height 0.5310 In, SAE Number D, Length Tolerance +0.000 to -0.010, Tensile Strength 72, 000 PSI, Rockwell Hardness B90, Package 10 '