Allen Nut System of Measurement Inch Insert Diameter 51/64 in Overall Length 27/32 in Installed Length Not Applicable Thread Size M14-2.00 Thread Direction Right Hand Thread Type Coarse Flange Diameter Not Applicable Flange Thickness Not Applicable Material Steel Material Grade/Class Grade 2H Finish Black Oxide Body Texture Knurled Compatible Material Metal Drill Bit Size 53/64 in Maximum Hole Diameter 0.831 in Minimum Material Thickness 0.836 in