Wedge Anchor System of Measurement Inch Anchor Diameter 1/4 in Thread Size 1/4 In.-20 Overall Length 2 1/4 in Thread Length 1 1/4 in Material Steel Material Grade/Class Not Graded Finish Zinc Plated Compatible Material Concrete Drill Bit Size 1/4 in Minimum Installation Depth 1 1/2 in Minimum Material Thickness 4 in Ultimate Shear Strength (4 000 psi Concrete) 1 400 lb Ultimate Tension Strength (4 000 psi Concrete) 1 780 lb Wedge Anchor Type Wedge Anchor Seismic Approved No